feat: refactor input source handling and add audio input service

.gitignore

@@ -164,4 +164,5 @@ fabric.properties
 !/gradle/wrapper/gradle-wrapper.jar
 macos/Flutter/ephemeral/flutter_export_environment.sh
 macos/Flutter/ephemeral/Flutter-Generated.xcconfig
-*.py
+*.py
+PDW

README.md

@@ -1,12 +1,8 @@
 # LBJ_Console
 
-LBJ Console 是一个应用程序，用于通过 BLE 从 [SX1276_Receive_LBJ](https://github.com/undef-i/SX1276_Receive_LBJ) 设备接收并显示列车预警消息，功能包括：
+LBJ Console 是一个应用程序，用于接收并显示列车预警消息，功能包括：
 
-- 接收列车预警消息，支持可选的手机推送通知。
+应用程序支持从 SX1276_Receive_LBJ 获取 BLE 预警数据，或直接连接 RTL-TCP 服务器从 RTL-SDR 接收预警消息。在可视化方面，软件能够在地图上标注预警消息的 GPS 位置，并支持绘制指定列车的运行轨迹。此外，程序内置了机车数据文件，可根据数据内容匹配并显示机车配属、机车类型以及车次类型。
-- 监控指定列车的轨迹，在地图上显示。
-- 在地图上显示预警消息的 GPS 信息。
-- 基于内置数据文件显示机车配属，机车类型和车次类型。
-- 连接 RTL-TCP 服务器获取预警消息。
 
 [android](https://github.com/undef-i/LBJ_Console/tree/android) 分支包含项目早期基于 Android 平台的实现代码，已实现基本功能，现已停止开发。
 
@@ -26,6 +22,7 @@ LBJ Console 依赖以下数据文件，位于 `assets` 目录，用于支持机
 
 - 集成 ESP-Touch 协议，实现设备 WiFi 凭证的配置。
 - 从设备端拉取历史数据记录。
+- 从音频流解析预警消息。
 
 # 致谢
 

android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
+    
+    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
+
     <uses-permission android:name="android.permission.BLUETOOTH"/>
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
     <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" android:usesPermissionFlags="neverForLocation"/>
@@ -31,10 +34,6 @@
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
             android:windowSoftInputMode="adjustResize">
-            <!-- Specifies an Android theme to apply to this Activity as soon as
-                 the Android process has started. This theme is visible to the user
-                 while the Flutter UI initializes. After that, this theme continues
-                 to determine the Window background behind the Flutter UI. -->
             <meta-data
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme"
@@ -44,13 +43,10 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
-        <!-- Don't delete the meta-data below.
-             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />
             
-        <!-- 前台服务配置 -->
         <service
             android:name="id.flutter.flutter_background_service.BackgroundService"
             android:foregroundServiceType="connectedDevice|dataSync"
@@ -59,15 +55,10 @@
             android:enabled="true"
             tools:replace="android:exported"/>
     </application>
-    <!-- Required to query activities that can process text, see:
-         https://developer.android.com/training/package-visibility and
-         https://developer.android.com/reference/android/content/Intent#ACTION_PROCESS_TEXT.
-
-         In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
     <queries>
         <intent>
             <action android:name="android.intent.action.PROCESS_TEXT"/>
             <data android:mimeType="text/plain"/>
         </intent>
     </queries>
-</manifest>
+</manifest>

android/app/src/main/cpp/demod.cpp

@@ -14,17 +14,29 @@ uint32_t bits;
 uint32_t code_words[PAGERDEMOD_BATCH_WORDS];
 bool code_words_bch_error[PAGERDEMOD_BATCH_WORDS];
 
+static bool hysteresis_state = false;
+static bool dsp_initialized = false;
+
 std::string numeric_msg, alpha_msg;
 int function_bits;
 uint32_t address;
-uint32_t alpha_bit_buffer; // Bit buffer to 7-bit chars spread across codewords
+uint32_t alpha_bit_buffer;
-int alpha_bit_buffer_bits; // Count of bits in alpha_bit_buffer
+int alpha_bit_buffer_bits;
-int parity_errors;         // Count of parity errors in current message
+int parity_errors;
-int bch_errors;            // Count of BCH errors in current message
+int bch_errors;
-int batch_num;             // Count of batches in current transmission
+int batch_num;
 
 double magsqRaw;
 
+void ensureDSPInitialized() {
+    if (dsp_initialized) return;
+    
+    lowpassBaud.create(301, SAMPLE_RATE, BAUD_RATE * 5.0f);
+    phaseDiscri.setFMScaling(SAMPLE_RATE / (2.0f * DEVIATION));
+    
+    dsp_initialized = true;
+}
+
 int pop_cnt(uint32_t cw)
 {
     int cnt = 0;
@@ -39,10 +51,9 @@ int pop_cnt(uint32_t cw)
 uint32_t bchEncode(const uint32_t cw)
 {
     uint32_t bit = 0;
-    uint32_t localCW = cw & 0xFFFFF800; // Mask off BCH parity and even parity bits
+    uint32_t localCW = cw & 0xFFFFF800; 
     uint32_t cwE = localCW;
 
-    // Calculate BCH bits
     for (bit = 1; bit <= 21; bit++)
     {
         if (cwE & 0x80000000)
@@ -56,38 +67,28 @@ uint32_t bchEncode(const uint32_t cw)
     return localCW;
 }
 
-// Use BCH decoding to try to fix any bit errors
-// Returns true if able to be decode/repair successful
-// See: https://www.eevblog.com/forum/microcontrollers/practical-guides-to-bch-fec/
 bool bchDecode(const uint32_t cw, uint32_t &correctedCW)
 {
-    // Calculate syndrome
-    // We do this by recalculating the BCH parity bits and XORing them against the received ones
     uint32_t syndrome = ((bchEncode(cw) ^ cw) >> 1) & 0x3FF;
 
     if (syndrome == 0)
     {
-        // Syndrome of zero indicates no repair required
         correctedCW = cw;
         return true;
     }
 
-    // Meggitt decoder
-
     uint32_t result = 0;
     uint32_t damagedCW = cw;
 
-    // Calculate BCH bits
     for (uint32_t xbit = 0; xbit < 31; xbit++)
     {
-        // Produce the next corrected bit in the high bit of the result
         result <<= 1;
-        if ((syndrome == 0x3B4) || // 0x3B4: Syndrome when a single error is detected in the MSB
+        if ((syndrome == 0x3B4) || 
-            (syndrome == 0x26E) || // 0x26E: Two adjacent errors
+            (syndrome == 0x26E) || 
-            (syndrome == 0x359) || // 0x359: Two errors, one OK bit between
+            (syndrome == 0x359) || 
-            (syndrome == 0x076) || // 0x076: Two errors, two OK bits between
+            (syndrome == 0x076) || 
-            (syndrome == 0x255) || // 0x255: Two errors, three OK bits between
+            (syndrome == 0x255) || 
-            (syndrome == 0x0F0) || // 0x0F0: Two errors, four OK bits between
+            (syndrome == 0x0F0) || 
             (syndrome == 0x216) ||
             (syndrome == 0x365) ||
             (syndrome == 0x068) ||
@@ -114,36 +115,29 @@ bool bchDecode(const uint32_t cw, uint32_t &correctedCW)
             (syndrome == 0x3B6) ||
             (syndrome == 0x3B5))
         {
-            // Syndrome matches an error in the MSB
-            // Correct that error and adjust the syndrome to account for it
             syndrome ^= 0x3B4;
             result |= (~damagedCW & 0x80000000) >> 30;
         }
         else
         {
-            // No error
             result |= (damagedCW & 0x80000000) >> 30;
         }
         damagedCW <<= 1;
 
-        // Handle syndrome shift register feedback
         if (syndrome & 0x200)
         {
             syndrome <<= 1;
-            syndrome ^= 0x769; // 0x769 = POCSAG generator polynomial -- x^10 + x^9 + x^8 + x^6 + x^5 + x^3 + 1
+            syndrome ^= 0x769; 
         }
         else
         {
             syndrome <<= 1;
         }
-        // Mask off bits which fall off the end of the syndrome shift register
         syndrome &= 0x3FF;
     }
 
-    // Check if error correction was successful
     if (syndrome != 0)
     {
-        // Syndrome nonzero at end indicates uncorrectable errors
         correctedCW = cw;
         return false;
     }
@@ -162,13 +156,11 @@ int xorBits(uint32_t word, int firstBit, int lastBit)
     return x;
 }
 
-// Check for even parity
 bool evenParity(uint32_t word, int firstBit, int lastBit, int parityBit)
 {
     return xorBits(word, firstBit, lastBit) == parityBit;
 }
 
-// Reverse order of bits
 uint32_t reverse(uint32_t x)
 {
     x = (((x & 0xaaaaaaaa) >> 1) | ((x & 0x55555555) << 1));
@@ -178,10 +170,6 @@ uint32_t reverse(uint32_t x)
     return ((x >> 16) | (x << 16));
 }
 
-// Decode a batch of codewords to addresses and messages
-// Messages may be spreadout over multiple batches
-// https://www.itu.int/dms_pubrec/itu-r/rec/m/R-REC-M.584-1-198607-S!!PDF-E.pdf
-// https://www.itu.int/dms_pubrec/itu-r/rec/m/R-REC-M.584-2-199711-I!!PDF-E.pdf
 void decodeBatch()
 {
     int i = 1;
@@ -190,17 +178,13 @@ void decodeBatch()
         for (int word = 0; word < PAGERDEMOD_CODEWORDS_PER_FRAME; word++)
         {
             bool addressCodeWord = ((code_words[i] >> 31) & 1) == 0;
-
-            // Check parity bit
             bool parityError = !evenParity(code_words[i], 1, 31, code_words[i] & 0x1);
 
             if (code_words[i] == PAGERDEMOD_POCSAG_IDLECODE)
             {
-                // Idle
             }
             else if (addressCodeWord)
             {
-                // Address
                 function_bits = (code_words[i] >> 11) & 0x3;
                 int addressBits = (code_words[i] >> 13) & 0x3ffff;
                 address = (addressBits << 3) | frame;
@@ -213,44 +197,30 @@ void decodeBatch()
             }
             else
             {
-                // Message - decode as both numeric and ASCII - not all operators use functionBits to indidcate encoding
                 int messageBits = (code_words[i] >> 11) & 0xfffff;
-                if (parityError)
+                if (parityError) parity_errors++;
-                {
+                if (code_words_bch_error[i]) bch_errors++;
-                    parity_errors++;
-                }
-                if (code_words_bch_error[i])
-                {
-                    bch_errors++;
-                }
 
-                // Numeric format
                 for (int j = 16; j >= 0; j -= 4)
                 {
                     uint32_t numericBits = (messageBits >> j) & 0xf;
                     numericBits = reverse(numericBits) >> (32 - 4);
-                    // Spec has 0xa as 'spare', but other decoders treat is as .
                     const char numericChars[] = {
                         '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.', 'U', ' ', '-', ')', '('};
                     char numericChar = numericChars[numericBits];
                     numeric_msg.push_back(numericChar);
                 }
 
-                // 7-bit ASCII alpnanumeric format
                 alpha_bit_buffer = (alpha_bit_buffer << 20) | messageBits;
                 alpha_bit_buffer_bits += 20;
                 while (alpha_bit_buffer_bits >= 7)
                 {
-                    // Extract next 7-bit character from bit buffer
                     char c = (alpha_bit_buffer >> (alpha_bit_buffer_bits - 7)) & 0x7f;
-                    // Reverse bit ordering
                     c = reverse(c) >> (32 - 7);
-                    // Add to received message string (excluding, null, end of text, end ot transmission)
                     if (c != 0 && c != 0x3 && c != 0x4)
                     {
                         alpha_msg.push_back(c);
                     }
-                    // Remove from bit buffer
                     alpha_bit_buffer_bits -= 7;
                     if (alpha_bit_buffer_bits == 0)
                     {
@@ -262,25 +232,16 @@ void decodeBatch()
                     }
                 }
             }
-
-            // Move to next codeword
             i++;
         }
     }
 }
 
-void processOneSample(int8_t i, int8_t q)
+void processBasebandSample(double sample)
 {
-    float fi = ((float)i) / 128.0f;
+    ensureDSPInitialized();
-    float fq = ((float)q) / 128.0f;
 
-    std::complex<float> iq(fi, fq);
+    double filt = lowpassBaud.filter(sample);
-
-    float deviation;
-    double fmDemod = phaseDiscri.phaseDiscriminatorDelta(iq, magsqRaw, deviation);
-    // printf("fmDemod: %.3f\n", fmDemod);
-
-    double filt = lowpassBaud.filter(fmDemod);
 
     if (!got_SC)
     {
@@ -288,54 +249,49 @@ void processOneSample(int8_t i, int8_t q)
         dc_offset = preambleMovingAverage.asDouble();
     }
 
-    bool data = (filt - dc_offset) >= 0.0;
+    double sample_val = filt - dc_offset;
-    // printf("filt - dc: %.3f\n", filt - dc_offset);
+    double threshold = 0.05; 
+    
+    if (sample_val > threshold) 
+    {
+        hysteresis_state = true;
+    }
+    else if (sample_val < -threshold) 
+    {
+        hysteresis_state = false;
+    }
+
+    bool data = hysteresis_state;
 
     if (data != prev_data)
     {
-        sync_cnt = SAMPLES_PER_SYMBOL / 2; // reset
+        sync_cnt = SAMPLES_PER_SYMBOL / 2; 
     }
     else
     {
-        sync_cnt--; // wait until next bit's midpoint
+        sync_cnt--; 
 
         if (sync_cnt <= 0)
         {
-            if (bit_inverted)
+            if (bit_inverted) data_bit = data;
-            {
+            else data_bit = !data;
-                data_bit = data;
-            }
-            else
-            {
-                data_bit = !data;
-            }
-
-            // printf("%d", data_bit);
 
             bits = (bits << 1) | data_bit;
             bit_cnt++;
 
-            if (bit_cnt > 32)
+            if (bit_cnt > 32) bit_cnt = 32;
-            {
-                bit_cnt = 32;
-            }
 
             if (bit_cnt == 32 && !got_SC)
             {
-                // printf("pop count:     %d\n", pop_cnt(bits ^ POCSAG_SYNCCODE));
-                // printf("pop count inv: %d\n", pop_cnt(bits ^ POCSAG_SYNCCODE_INV));
-
                 if (bits == POCSAG_SYNCCODE)
                 {
                     got_SC = true;
                     bit_inverted = false;
-                    printf("\nSync code found\n");
                 }
                 else if (bits == POCSAG_SYNCCODE_INV)
                 {
                     got_SC = true;
                     bit_inverted = true;
-                    printf("\nSync code found\n");
                 }
                 else if (pop_cnt(bits ^ POCSAG_SYNCCODE) <= 3)
                 {
@@ -344,9 +300,7 @@ void processOneSample(int8_t i, int8_t q)
                     {
                         got_SC = true;
                         bit_inverted = false;
-                        printf("\nSync code found\n");
                     }
-                    // else printf("\nSync code not found\n");
                 }
                 else if (pop_cnt(bits ^ POCSAG_SYNCCODE_INV) <= 3)
                 {
@@ -355,9 +309,7 @@ void processOneSample(int8_t i, int8_t q)
                     {
                         got_SC = true;
                         bit_inverted = true;
-                        printf("\nSync code found\n");
                     }
-                    // else printf("\nSync code not found\n");
                 }
 
                 if (got_SC)
@@ -394,7 +346,6 @@ void processOneSample(int8_t i, int8_t q)
                 if (address > 0 && !numeric_msg.empty())
                 {
                     is_message_ready = true;
-                    printf("Addr: %d | Numeric: %s | Alpha: %s\n", address, numeric_msg.c_str(), alpha_msg.c_str());
                 }
                 else
                 {
@@ -408,3 +359,16 @@ void processOneSample(int8_t i, int8_t q)
 
     prev_data = data;
 }
+
+void processOneSample(int8_t i, int8_t q)
+{
+    float fi = ((float)i) / 128.0f;
+    float fq = ((float)q) / 128.0f;
+
+    std::complex<float> iq(fi, fq);
+
+    float deviation;
+    double fmDemod = phaseDiscri.phaseDiscriminatorDelta(iq, magsqRaw, deviation);
+    
+    processBasebandSample(fmDemod);
+}

android/app/src/main/cpp/demod.h

@@ -34,6 +34,8 @@ extern Lowpass<double> lowpassBaud;
 extern MovingAverageUtil<double, double, 2048> preambleMovingAverage;
 extern double magsqRaw;
 
+void ensureDSPInitialized();
 void processOneSample(int8_t i, int8_t q);
+void processBasebandSample(double sample);
 
 #endif

android/app/src/main/cpp/native-lib.cpp

@@ -8,6 +8,8 @@
 #include <chrono>
 #include <unistd.h>
 #include <arpa/inet.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
 #include <fcntl.h>
 #include <android/log.h>
 #include <errno.h>
@@ -84,6 +86,40 @@ Java_org_noxylva_lbjconsole_flutter_RtlTcpChannelHandler_startClientAsync(
     env->ReleaseStringUTFChars(port_, portStr);
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_org_noxylva_lbjconsole_flutter_AudioInputHandler_nativePushAudio(
+        JNIEnv *env, jobject thiz, jshortArray audioData, jint size) {
+    
+    ensureDSPInitialized();
+
+    jshort *samples = env->GetShortArrayElements(audioData, NULL);
+    
+    std::lock_guard<std::mutex> demodLock(demodDataMutex);
+
+    for (int i = 0; i < size; i++) {
+        double sample = (double)samples[i] / 32768.0; 
+        
+        sample *= 5.0; 
+
+        processBasebandSample(sample);
+    }
+
+    env->ReleaseShortArrayElements(audioData, samples, 0);
+    
+    if (is_message_ready) {
+        std::ostringstream ss;
+        std::lock_guard<std::mutex> msgLock(msgMutex);
+
+        std::string message_content = alpha_msg.empty() ? numeric_msg : alpha_msg;
+        ss << "[MSG]" << address << "|" << function_bits << "|" << message_content;
+        messageBuffer.push_back(ss.str());
+
+        is_message_ready = false;
+        numeric_msg.clear();
+        alpha_msg.clear();
+    }
+}
+
 extern "C" JNIEXPORT jdouble JNICALL
 Java_org_noxylva_lbjconsole_flutter_RtlTcpChannelHandler_getSignalStrength(JNIEnv *, jobject)
 {
@@ -171,8 +207,8 @@ void clientThread(std::string host, int port)
         goto cleanup;
     }
 
-    lowpassBaud.create(301, SAMPLE_RATE, BAUD_RATE * 5.0f);
+    ensureDSPInitialized();
-    phaseDiscri.setFMScaling(SAMPLE_RATE / (2.0f * DEVIATION));
+    
     sockfd_atomic.store(localSockfd);
     {
         std::lock_guard<std::mutex> lock(msgMutex);

android/app/src/main/kotlin/org/noxylva/lbjconsole/flutter/AudioInputHandler.kt

@@ -0,0 +1,126 @@
+package org.noxylva.lbjconsole.flutter
+
+import android.Manifest
+import android.content.Context
+import android.content.pm.PackageManager
+import android.media.AudioFormat
+import android.media.AudioRecord
+import android.media.MediaRecorder
+import android.util.Log
+import androidx.core.content.ContextCompat
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodCall
+import io.flutter.plugin.common.MethodChannel
+import java.util.concurrent.atomic.AtomicBoolean
+
+class AudioInputHandler(private val context: Context) : MethodChannel.MethodCallHandler {
+    private var audioRecord: AudioRecord? = null
+    private val isRecording = AtomicBoolean(false)
+    private var recordingThread: Thread? = null
+    
+    private val sampleRate = 48000
+    private val bufferSize = AudioRecord.getMinBufferSize(
+        sampleRate,
+        AudioFormat.CHANNEL_IN_MONO,
+        AudioFormat.ENCODING_PCM_16BIT
+    ) * 2
+
+    companion object {
+        private const val CHANNEL = "org.noxylva.lbjconsole/audio_input"
+        private const val TAG = "AudioInputHandler"
+
+        fun registerWith(flutterEngine: FlutterEngine, context: Context) {
+            val channel = MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL)
+            channel.setMethodCallHandler(AudioInputHandler(context))
+        }
+    }
+
+    private external fun nativePushAudio(data: ShortArray, size: Int)
+
+    override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
+        when (call.method) {
+            "start" -> {
+                if (startRecording()) {
+                    result.success(null)
+                } else {
+                    result.error("AUDIO_ERROR", "Failed to start audio recording", null)
+                }
+            }
+            "stop" -> {
+                stopRecording()
+                result.success(null)
+            }
+            else -> result.notImplemented()
+        }
+    }
+
+    private fun startRecording(): Boolean {
+        if (isRecording.get()) return true
+
+        if (ContextCompat.checkSelfPermission(
+                context,
+                Manifest.permission.RECORD_AUDIO
+            ) != PackageManager.PERMISSION_GRANTED
+        ) {
+            Log.e(TAG, "Permission not granted")
+            return false
+        }
+
+        try {
+            val audioSource = MediaRecorder.AudioSource.UNPROCESSED
+            
+            audioRecord = AudioRecord(
+                audioSource,
+                sampleRate,
+                AudioFormat.CHANNEL_IN_MONO,
+                AudioFormat.ENCODING_PCM_16BIT,
+                bufferSize
+            )
+
+            if (audioRecord?.state != AudioRecord.STATE_INITIALIZED) {
+                Log.e(TAG, "AudioRecord init failed")
+                return false
+            }
+
+            audioRecord?.startRecording()
+            isRecording.set(true)
+
+            recordingThread = Thread {
+                val buffer = ShortArray(bufferSize)
+                while (isRecording.get()) {
+                    val readSize = audioRecord?.read(buffer, 0, buffer.size) ?: 0
+                    if (readSize > 0) {
+                        nativePushAudio(buffer, readSize)
+                    }
+                }
+            }
+            recordingThread?.priority = Thread.MAX_PRIORITY
+            recordingThread?.start()
+            return true
+        } catch (e: Exception) {
+            Log.e(TAG, "Start recording exception", e)
+            stopRecording()
+            return false
+        }
+    }
+
+    private fun stopRecording() {
+        isRecording.set(false)
+        try {
+            recordingThread?.join(1000)
+        } catch (e: InterruptedException) {
+            e.printStackTrace()
+        }
+        
+        try {
+            if (audioRecord?.recordingState == AudioRecord.RECORDSTATE_RECORDING) {
+                audioRecord?.stop()
+            }
+            audioRecord?.release()
+        } catch (e: Exception) {
+            Log.e(TAG, "Stop recording exception", e)
+        }
+        audioRecord = null
+        recordingThread = null
+    }
+}

android/app/src/main/kotlin/org/noxylva/lbjconsole/flutter/MainActivity.kt

@@ -7,5 +7,6 @@ class MainActivity: FlutterActivity() {
     override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
         super.configureFlutterEngine(flutterEngine)
         RtlTcpChannelHandler.registerWith(flutterEngine)
+        AudioInputHandler.registerWith(flutterEngine, applicationContext)
     }
-}
+}

android/build.gradle

@@ -7,13 +7,27 @@ allprojects {
 }
 
 rootProject.buildDir = "../build"
+
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
 }
+
 subprojects {
     project.evaluationDependsOn(":app")
 }
 
+subprojects {
+    if (project.name != "app") {
+        project.afterEvaluate {
+            if (project.hasProperty("android")) {
+                project.android {
+                    compileSdk 36
+                }
+            }
+        }
+    }
+}
+
 tasks.register("clean", Delete) {
     delete rootProject.buildDir
-}
+}

lib/screens/main_screen.dart

@@ -13,15 +13,15 @@ import 'package:lbjconsole/services/database_service.dart';
 import 'package:lbjconsole/services/notification_service.dart';
 import 'package:lbjconsole/services/background_service.dart';
 import 'package:lbjconsole/services/rtl_tcp_service.dart';
+import 'package:lbjconsole/services/audio_input_service.dart';
 import 'package:lbjconsole/themes/app_theme.dart';
-import 'dart:convert';
 
 class _ConnectionStatusWidget extends StatefulWidget {
   final BLEService bleService;
   final RtlTcpService rtlTcpService;
   final DateTime? lastReceivedTime;
   final DateTime? rtlTcpLastReceivedTime;
-  final bool rtlTcpEnabled;
+  final InputSource inputSource;
   final bool rtlTcpConnected;
 
   const _ConnectionStatusWidget({
@@ -29,7 +29,7 @@ class _ConnectionStatusWidget extends StatefulWidget {
     required this.rtlTcpService,
     required this.lastReceivedTime,
     required this.rtlTcpLastReceivedTime,
-    required this.rtlTcpEnabled,
+    required this.inputSource,
     required this.rtlTcpConnected,
   });
 
@@ -59,6 +59,15 @@ class _ConnectionStatusWidgetState extends State<_ConnectionStatusWidget> {
     _deviceStatus = widget.bleService.deviceStatus;
   }
 
+  @override
+  void didUpdateWidget(covariant _ConnectionStatusWidget oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.inputSource != widget.inputSource ||
+        oldWidget.rtlTcpConnected != widget.rtlTcpConnected) {
+      setState(() {});
+    }
+  }
+
   @override
   void dispose() {
     _connectionSubscription?.cancel();
@@ -67,18 +76,31 @@ class _ConnectionStatusWidgetState extends State<_ConnectionStatusWidget> {
 
   @override
   Widget build(BuildContext context) {
-    final isRtlTcpMode = widget.rtlTcpEnabled;
+    bool isConnected;
-    final rtlTcpConnected = widget.rtlTcpConnected;
+    Color statusColor;
-    
+    String statusText;
-    final isConnected = isRtlTcpMode ? rtlTcpConnected : _isConnected;
+    DateTime? displayTime;
-    final statusColor = isRtlTcpMode 
+
-        ? (rtlTcpConnected ? Colors.green : Colors.red)
+    switch (widget.inputSource) {
-        : (_isConnected ? Colors.green : Colors.red);
+      case InputSource.rtlTcp:
-    final statusText = isRtlTcpMode 
+        isConnected = widget.rtlTcpConnected;
-        ? (rtlTcpConnected ? '已连接' : '未连接')
+        statusColor = isConnected ? Colors.green : Colors.red;
-        : _deviceStatus;
+        statusText = isConnected ? '已连接' : '未连接';
-    
+        displayTime = widget.rtlTcpLastReceivedTime;
-    final lastReceivedTime = isRtlTcpMode ? widget.rtlTcpLastReceivedTime : widget.lastReceivedTime;
+        break;
+      case InputSource.audioInput:
+        isConnected = AudioInputService().isListening;
+        statusColor = isConnected ? Colors.green : Colors.red;
+        statusText = isConnected ? '监听中' : '已停止';
+        displayTime = widget.rtlTcpLastReceivedTime ?? widget.lastReceivedTime;
+        break;
+      case InputSource.bluetooth:
+        isConnected = _isConnected;
+        statusColor = isConnected ? Colors.green : Colors.red;
+        statusText = _deviceStatus;
+        displayTime = widget.lastReceivedTime;
+        break;
+    }
     
     return Row(
       children: [
@@ -86,12 +108,12 @@ class _ConnectionStatusWidgetState extends State<_ConnectionStatusWidget> {
           mainAxisAlignment: MainAxisAlignment.center,
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            if (lastReceivedTime == null || !isConnected) ...[
+            if (displayTime == null || !isConnected) ...[
               Text(statusText,
                   style: const TextStyle(color: Colors.white70, fontSize: 12)),
             ],
             _LastReceivedTimeWidget(
-              lastReceivedTime: lastReceivedTime,
+              lastReceivedTime: displayTime,
               isConnected: isConnected,
             ),
           ],
@@ -215,7 +237,9 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
   DateTime? _lastReceivedTime;
   DateTime? _rtlTcpLastReceivedTime;
   bool _isHistoryEditMode = false;
-  bool _rtlTcpEnabled = false;
+  
+  InputSource _inputSource = InputSource.bluetooth;
+  
   bool _rtlTcpConnected = false;
   bool _isConnected = false;
   final GlobalKey<HistoryScreenState> _historyScreenKey =
@@ -230,7 +254,7 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
     _bleService = BLEService();
     _rtlTcpService = RtlTcpService();
     _bleService.initialize();
-    _loadRtlTcpSettings();
+    _loadInputSettings();
     _initializeServices();
     _checkAndStartBackgroundService();
     _setupConnectionListener();
@@ -248,23 +272,26 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
     }
   }
 
-  void _loadRtlTcpSettings() async {
+  void _loadInputSettings() async {
-    developer.log('rtl_tcp: load_settings');
     final settings = await _databaseService.getAllSettings();
-    developer.log('rtl_tcp: settings_loaded: enabled=${(settings?['rtlTcpEnabled'] ?? 0) == 1}, host=${settings?['rtlTcpHost']?.toString() ?? '127.0.0.1'}, port=${settings?['rtlTcpPort']?.toString() ?? '14423'}');
+    final sourceStr = settings?['inputSource'] as String? ?? 'bluetooth';
+    
     if (mounted) {
       setState(() {
-        _rtlTcpEnabled = (settings?['rtlTcpEnabled'] ?? 0) == 1;
+        _inputSource = InputSource.values.firstWhere(
+          (e) => e.name == sourceStr,
+          orElse: () => InputSource.bluetooth,
+        );
         _rtlTcpConnected = _rtlTcpService.isConnected;
       });
       
-      if (_rtlTcpEnabled && !_rtlTcpConnected) {
+      if (_inputSource == InputSource.rtlTcp && !_rtlTcpConnected) {
         final host = settings?['rtlTcpHost']?.toString() ?? '127.0.0.1';
         final port = settings?['rtlTcpPort']?.toString() ?? '14423';
-        developer.log('rtl_tcp: auto_connect');
         _connectToRtlTcp(host, port);
-      } else {
+      } else if (_inputSource == InputSource.audioInput) {
-        developer.log('rtl_tcp: skip_connect: enabled=$_rtlTcpEnabled, connected=$_rtlTcpConnected');
+        await AudioInputService().startListening();
+        setState(() {}); 
       }
     }
   }
@@ -292,41 +319,47 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
     _rtlTcpLastReceivedTimeSubscription =
         _rtlTcpService.lastReceivedTimeStream.listen((time) {
       if (mounted) {
-        if (_rtlTcpEnabled) {
+        setState(() {
-          setState(() {
+          _rtlTcpLastReceivedTime = time;
-            _rtlTcpLastReceivedTime = time;
+        });
-          });
-        }
       }
     });
   }
 
   void _setupSettingsListener() {
-    developer.log('rtl_tcp: setup_listener');
     _settingsSubscription =
         DatabaseService.instance.onSettingsChanged((settings) {
-      developer.log('rtl_tcp: settings_changed: enabled=${(settings['rtlTcpEnabled'] ?? 0) == 1}, host=${settings['rtlTcpHost']?.toString() ?? '127.0.0.1'}, port=${settings['rtlTcpPort']?.toString() ?? '14423'}');
       if (mounted) {
-        final rtlTcpEnabled = (settings['rtlTcpEnabled'] ?? 0) == 1;
+        final sourceStr = settings['inputSource'] as String? ?? 'bluetooth';
-        if (rtlTcpEnabled != _rtlTcpEnabled) {
+        print('[MainScreen] Settings changed: inputSource=$sourceStr');
-          setState(() {
+        final newInputSource = InputSource.values.firstWhere(
-            _rtlTcpEnabled = rtlTcpEnabled;
+          (e) => e.name == sourceStr,
-          });
+          orElse: () => InputSource.bluetooth,
-          
+        );
-          if (rtlTcpEnabled) {
+
-            final host = settings['rtlTcpHost']?.toString() ?? '127.0.0.1';
+        print('[MainScreen] Current: $_inputSource, New: $newInputSource');
-            final port = settings['rtlTcpPort']?.toString() ?? '14423';
+        
-            _connectToRtlTcp(host, port);
+        setState(() {
-          } else {
+          _inputSource = newInputSource;
-          _rtlTcpConnectionSubscription?.cancel();
+        });
-          _rtlTcpDataSubscription?.cancel();
+        
-          _rtlTcpLastReceivedTimeSubscription?.cancel();
+        switch (newInputSource) {
-          _rtlTcpService.disconnect();
+          case InputSource.rtlTcp:
-          setState(() {
+            setState(() {
-            _rtlTcpConnected = false;
+              _rtlTcpConnected = _rtlTcpService.isConnected;
-            _rtlTcpLastReceivedTime = null;
+            });
-          });
+            print('[MainScreen] RTL-TCP mode, connected: $_rtlTcpConnected');
-          }
+            break;
+          case InputSource.audioInput:
+            setState(() {});
+            break;
+          case InputSource.bluetooth:
+            _rtlTcpService.disconnect();
+            setState(() {
+              _rtlTcpConnected = false;
+              _rtlTcpLastReceivedTime = null;
+            });
+            break;
         }
         
         if (_currentIndex == 1) {
@@ -347,20 +380,16 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
     
     _rtlTcpConnectionSubscription = _rtlTcpService.connectionStream.listen((connected) {
       if (mounted) {
-        if (_rtlTcpEnabled) {
+        setState(() {
-          setState(() {
+          _rtlTcpConnected = connected;
-            _rtlTcpConnected = connected;
+        });
-          });
-        }
       }
     });
   }
 
   Future<void> _connectToRtlTcp(String host, String port) async {
-    developer.log('rtl_tcp: connect: $host:$port');
     try {
       await _rtlTcpService.connect(host: host, port: port);
-      developer.log('rtl_tcp: connect_req_sent');
     } catch (e) {
       developer.log('rtl_tcp: connect_fail: $e');
     }
@@ -391,38 +420,37 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
     await _notificationService.initialize();
 
     _dataSubscription = _bleService.dataStream.listen((record) {
-      _notificationService.showTrainNotification(record);
+      if (_inputSource == InputSource.bluetooth) {
-      if (_historyScreenKey.currentState != null) {
+        _processRecord(record);
-        _historyScreenKey.currentState!.addNewRecord(record);
-      }
-      if (_realtimeScreenKey.currentState != null) {
-        _realtimeScreenKey.currentState!.addNewRecord(record);
       }
     });
 
     _rtlTcpDataSubscription = _rtlTcpService.dataStream.listen((record) {
-      developer.log('rtl_tcp: recv_data: train=${record.train}');
+      if (_inputSource != InputSource.bluetooth) {
-      developer.log('rtl_tcp: recv_json: ${jsonEncode(record.toJson())}');
+        _processRecord(record);
-      _notificationService.showTrainNotification(record);
-      if (_historyScreenKey.currentState != null) {
-        _historyScreenKey.currentState!.addNewRecord(record);
-      }
-      if (_realtimeScreenKey.currentState != null) {
-        _realtimeScreenKey.currentState!.addNewRecord(record);
       }
     });
   }
 
+  void _processRecord(record) {
+    _notificationService.showTrainNotification(record);
+    _historyScreenKey.currentState?.addNewRecord(record);
+    _realtimeScreenKey.currentState?.addNewRecord(record);
+  }
+
   void _showConnectionDialog() {
     _bleService.setAutoConnectBlocked(true);
     showDialog(
       context: context,
       barrierDismissible: true,
       builder: (context) =>
-          _PixelPerfectBluetoothDialog(bleService: _bleService, rtlTcpEnabled: _rtlTcpEnabled),
+          _PixelPerfectBluetoothDialog(
+              bleService: _bleService, 
+              inputSource: _inputSource
+          ),
     ).then((_) {
       _bleService.setAutoConnectBlocked(false);
-      if (!_bleService.isManualDisconnect) {
+      if (_inputSource == InputSource.bluetooth && !_bleService.isManualDisconnect) {
         _bleService.ensureConnection();
       }
     });
@@ -452,6 +480,12 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
       );
     }
 
+    final IconData statusIcon = switch (_inputSource) {
+      InputSource.rtlTcp => Icons.wifi,
+      InputSource.audioInput => Icons.mic,
+      InputSource.bluetooth => Icons.bluetooth,
+    };
+
     return AppBar(
       backgroundColor: AppTheme.primaryBlack,
       elevation: 0,
@@ -469,12 +503,12 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
                 rtlTcpService: _rtlTcpService,
                 lastReceivedTime: _lastReceivedTime,
                 rtlTcpLastReceivedTime: _rtlTcpLastReceivedTime,
-                rtlTcpEnabled: _rtlTcpEnabled,
+                inputSource: _inputSource,
                 rtlTcpConnected: _rtlTcpConnected,
               ),
               IconButton(
                 icon: Icon(
-                  _rtlTcpEnabled ? Icons.wifi : Icons.bluetooth,
+                  statusIcon,
                   color: Colors.white,
                 ),
                 onPressed: _showConnectionDialog,
@@ -562,7 +596,6 @@ class _MainScreenState extends State<MainScreen> with WidgetsBindingObserver {
       SettingsScreen(
         onSettingsChanged: () {
           _loadMapType();
-          _loadRtlTcpSettings();
         },
       ),
     ];
@@ -609,8 +642,8 @@ enum _ScanState { initial, scanning, finished }
 
 class _PixelPerfectBluetoothDialog extends StatefulWidget {
   final BLEService bleService;
-  final bool rtlTcpEnabled;
+  final InputSource inputSource;
-  const _PixelPerfectBluetoothDialog({required this.bleService, required this.rtlTcpEnabled});
+  const _PixelPerfectBluetoothDialog({required this.bleService, required this.inputSource});
   @override
   State<_PixelPerfectBluetoothDialog> createState() =>
       _PixelPerfectBluetoothDialogState();
@@ -625,6 +658,7 @@ class _PixelPerfectBluetoothDialogState
   DateTime? _lastReceivedTime;
   StreamSubscription? _rtlTcpConnectionSubscription;
   bool _rtlTcpConnected = false;
+  
   @override
   void initState() {
     super.initState();
@@ -640,11 +674,11 @@ class _PixelPerfectBluetoothDialogState
       }
     });
     
-    if (widget.rtlTcpEnabled && widget.bleService.rtlTcpService != null) {
+    if (widget.inputSource == InputSource.rtlTcp && widget.bleService.rtlTcpService != null) {
       _rtlTcpConnected = widget.bleService.rtlTcpService!.isConnected;
     }
     
-    if (!widget.bleService.isConnected && !widget.rtlTcpEnabled) {
+    if (!widget.bleService.isConnected && widget.inputSource == InputSource.bluetooth) {
       _startScan();
     }
   }
@@ -684,31 +718,24 @@ class _PixelPerfectBluetoothDialogState
     await widget.bleService.disconnect();
   }
 
-  void _setupLastReceivedTimeListener() {
-    _lastReceivedTimeSubscription =
-        widget.bleService.lastReceivedTimeStream.listen((timestamp) {
-      if (mounted) {
-        setState(() {
-          _lastReceivedTime = timestamp;
-        });
-      }
-    });
-  }
-
   @override
   Widget build(BuildContext context) {
-    final isConnected = widget.bleService.isConnected;
+    final (String title, Widget content) = switch (widget.inputSource) {
+      InputSource.rtlTcp => ('RTL-TCP 服务器', _buildRtlTcpView(context)),
+      InputSource.audioInput => ('音频输入', _buildAudioInputView(context)),
+      InputSource.bluetooth => (
+        '蓝牙设备',
+        widget.bleService.isConnected
+            ? _buildConnectedView(context, widget.bleService.connectedDevice)
+            : _buildDisconnectedView(context)
+      ),
+    };
+
     return AlertDialog(
-      title: Text(widget.rtlTcpEnabled ? 'RTL-TCP 服务器' : '蓝牙设备'),
+      title: Text(title),
       content: SizedBox(
         width: double.maxFinite,
-        child: SingleChildScrollView(
+        child: SingleChildScrollView(child: content),
-          child: widget.rtlTcpEnabled
-              ? _buildRtlTcpView(context)
-              : (isConnected
-                  ? _buildConnectedView(context, widget.bleService.connectedDevice)
-                  : _buildDisconnectedView(context)),
-        ),
       ),
       actions: [
         TextButton(
@@ -733,13 +760,6 @@ class _PixelPerfectBluetoothDialogState
       Text(device?.remoteId.str ?? '',
           style: Theme.of(context).textTheme.bodySmall,
           textAlign: TextAlign.center),
-      if (_lastReceivedTime != null) ...[
-        const SizedBox(height: 8),
-        _LastReceivedTimeWidget(
-          lastReceivedTime: _lastReceivedTime,
-          isConnected: widget.bleService.isConnected,
-        ),
-      ],
       const SizedBox(height: 16),
       ElevatedButton.icon(
           onPressed: _disconnect,
@@ -785,13 +805,21 @@ class _PixelPerfectBluetoothDialogState
       const SizedBox(height: 8),
       Text(currentAddress,
           style: TextStyle(color: isConnected ? Colors.green : Colors.grey)),
+    ]);
+  }
+
+  Widget _buildAudioInputView(BuildContext context) {
+    return Column(mainAxisSize: MainAxisSize.min, children: [
+      const Icon(Icons.mic, size: 48, color: Colors.blue),
       const SizedBox(height: 16),
-      if (_lastReceivedTime != null && isConnected) ...[
+      Text('监听中',
-        _LastReceivedTimeWidget(
+          style: Theme.of(context)
-          lastReceivedTime: _lastReceivedTime,
+              .textTheme
-          isConnected: isConnected,
+              .titleMedium
-        ),
+              ?.copyWith(fontWeight: FontWeight.bold)),
-      ],
+      const SizedBox(height: 8),
+      const Text("请使用音频线连接设备",
+          style: TextStyle(color: Colors.grey)),
     ]);
   }
 
@@ -818,4 +846,4 @@ class _PixelPerfectBluetoothDialogState
       ),
     );
   }
-}
+}

lib/screens/settings_screen.dart

@@ -5,6 +5,8 @@ import 'dart:io';
 import 'package:lbjconsole/models/merged_record.dart';
 import 'package:lbjconsole/services/database_service.dart';
 import 'package:lbjconsole/services/background_service.dart';
+import 'package:lbjconsole/services/audio_input_service.dart';
+import 'package:lbjconsole/services/rtl_tcp_service.dart';
 import 'package:lbjconsole/themes/app_theme.dart';
 import 'package:url_launcher/url_launcher.dart';
 
@@ -37,7 +39,9 @@ class _SettingsScreenState extends State<SettingsScreen> {
   GroupBy _groupBy = GroupBy.trainAndLoco;
   TimeWindow _timeWindow = TimeWindow.unlimited;
   String _mapType = 'map';
-  bool _rtlTcpEnabled = false;
+
+  InputSource _inputSource = InputSource.bluetooth;
+
   String _rtlTcpHost = '127.0.0.1';
   String _rtlTcpPort = '14423';
 
@@ -52,131 +56,6 @@ class _SettingsScreenState extends State<SettingsScreen> {
     _loadRecordCount();
   }
 
-  Widget _buildRtlTcpSettings() {
-    return Card(
-      color: AppTheme.tertiaryBlack,
-      elevation: 0,
-      shape: RoundedRectangleBorder(
-        borderRadius: BorderRadius.circular(16.0),
-      ),
-      child: Padding(
-        padding: const EdgeInsets.all(20.0),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            Row(
-              children: [
-                Icon(Icons.wifi,
-                    color: Theme.of(context).colorScheme.primary),
-                const SizedBox(width: 12),
-                const Text('RTL-TCP 源', style: AppTheme.titleMedium),
-              ],
-            ),
-            const SizedBox(height: 16),
-            Row(
-              mainAxisAlignment: MainAxisAlignment.spaceBetween,
-              children: [
-                const Column(
-                  crossAxisAlignment: CrossAxisAlignment.start,
-                  children: [
-                    Text('启用 RTL-TCP 源', style: AppTheme.bodyLarge),
-                  ],
-                ),
-                Switch(
-                  value: _rtlTcpEnabled,
-                  onChanged: (value) {
-                    setState(() {
-                      _rtlTcpEnabled = value;
-                    });
-                    _saveSettings();
-                  },
-                  activeThumbColor: Theme.of(context).colorScheme.primary,
-                ),
-              ],
-            ),
-            Visibility(
-              visible: _rtlTcpEnabled,
-              child: Column(
-                crossAxisAlignment: CrossAxisAlignment.start,
-                children: [
-                  const SizedBox(height: 16),
-                  TextField(
-                    decoration: InputDecoration(
-                      labelText: '服务器地址',
-                      hintText: '输入RTL-TCP服务器地址',
-                      labelStyle: const TextStyle(color: Colors.white70),
-                      hintStyle: const TextStyle(color: Colors.white54),
-                      border: OutlineInputBorder(
-                        borderSide: const BorderSide(color: Colors.white54),
-                        borderRadius: BorderRadius.circular(12.0),
-                      ),
-                      enabledBorder: OutlineInputBorder(
-                        borderSide: const BorderSide(color: Colors.white54),
-                        borderRadius: BorderRadius.circular(12.0),
-                      ),
-                      focusedBorder: OutlineInputBorder(
-                        borderSide:
-                            BorderSide(color: Theme.of(context).colorScheme.primary),
-                        borderRadius: BorderRadius.circular(12.0),
-                      ),
-                    ),
-                    style: const TextStyle(color: Colors.white),
-                    controller: _rtlTcpHostController,
-                    onChanged: (value) {
-                      setState(() {
-                        _rtlTcpHost = value;
-                      });
-                      _saveSettings();
-                    },
-                  ),
-                  const SizedBox(height: 16),
-                  TextField(
-                    decoration: InputDecoration(
-                      labelText: '服务器端口',
-                      hintText: '输入RTL-TCP服务器端口',
-                      labelStyle: const TextStyle(color: Colors.white70),
-                      hintStyle: const TextStyle(color: Colors.white54),
-                      border: OutlineInputBorder(
-                        borderSide: const BorderSide(color: Colors.white54),
-                        borderRadius: BorderRadius.circular(12.0),
-                      ),
-                      enabledBorder: OutlineInputBorder(
-                        borderSide: const BorderSide(color: Colors.white54),
-                        borderRadius: BorderRadius.circular(12.0),
-                      ),
-                      focusedBorder: OutlineInputBorder(
-                        borderSide:
-                            BorderSide(color: Theme.of(context).colorScheme.primary),
-                        borderRadius: BorderRadius.circular(12.0),
-                      ),
-                    ),
-                    style: const TextStyle(color: Colors.white),
-                    controller: _rtlTcpPortController,
-                    keyboardType: TextInputType.number,
-                    onChanged: (value) {
-                      setState(() {
-                        _rtlTcpPort = value;
-                      });
-                      _saveSettings();
-                    },
-                  ),
-                ],
-              ),
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-
-  @override
-  void dispose() {
-    _deviceNameController.dispose();
-    _rtlTcpHostController.dispose();
-    _rtlTcpPortController.dispose();
-    super.dispose();
-  }
-
   Future<void> _loadSettings() async {
     final settingsMap = await _databaseService.getAllSettings() ?? {};
     final settings = MergeSettings.fromMap(settingsMap);
@@ -193,20 +72,17 @@ class _SettingsScreenState extends State<SettingsScreen> {
         _groupBy = settings.groupBy;
         _timeWindow = settings.timeWindow;
         _mapType = settingsMap['mapType']?.toString() ?? 'webview';
-        _rtlTcpEnabled = (settingsMap['rtlTcpEnabled'] ?? 0) == 1;
+
         _rtlTcpHost = settingsMap['rtlTcpHost']?.toString() ?? '127.0.0.1';
         _rtlTcpPort = settingsMap['rtlTcpPort']?.toString() ?? '14423';
         _rtlTcpHostController.text = _rtlTcpHost;
         _rtlTcpPortController.text = _rtlTcpPort;
-      });
-    }
-  }
 
-  Future<void> _loadRecordCount() async {
+        final sourceStr = settingsMap['inputSource'] as String? ?? 'bluetooth';
-    final count = await _databaseService.getRecordCount();
+        _inputSource = InputSource.values.firstWhere(
-    if (mounted) {
+          (e) => e.name == sourceStr,
-      setState(() {
+          orElse: () => InputSource.bluetooth,
-        _recordCount = count;
+        );
       });
     }
   }
@@ -222,37 +98,43 @@ class _SettingsScreenState extends State<SettingsScreen> {
       'groupBy': _groupBy.name,
       'timeWindow': _timeWindow.name,
       'mapType': _mapType,
-      'rtlTcpEnabled': _rtlTcpEnabled ? 1 : 0,
+      'inputSource': _inputSource.name,
       'rtlTcpHost': _rtlTcpHost,
       'rtlTcpPort': _rtlTcpPort,
     });
     widget.onSettingsChanged?.call();
   }
 
-  @override
+  Future<void> _switchInputSource(InputSource newSource) async {
-  Widget build(BuildContext context) {
+    await AudioInputService().stopListening();
-    return SingleChildScrollView(
+    await RtlTcpService().disconnect();
-      padding: const EdgeInsets.all(20.0),
+    setState(() {
-      child: Column(
+      _inputSource = newSource;
-        crossAxisAlignment: CrossAxisAlignment.start,
+    });
-        children: [
+
-          _buildBluetoothSettings(),
+    switch (newSource) {
-          const SizedBox(height: 20),
+      case InputSource.audioInput:
-          _buildAppSettings(),
+        await AudioInputService().startListening();
-          const SizedBox(height: 20),
+        break;
-          _buildRtlTcpSettings(),
+      case InputSource.rtlTcp:
-          const SizedBox(height: 20),
+        RtlTcpService().connect(host: _rtlTcpHost, port: _rtlTcpPort);
-          _buildMergeSettings(),
+        break;
-          const SizedBox(height: 20),
+      case InputSource.bluetooth:
-          _buildDataManagement(),
+        break;
-          const SizedBox(height: 20),
+    }
-          _buildAboutSection(),
+
-        ],
+    _saveSettings();
-      ),
-    );
   }
 
-  Widget _buildBluetoothSettings() {
+  @override
+  void dispose() {
+    _deviceNameController.dispose();
+    _rtlTcpHostController.dispose();
+    _rtlTcpPortController.dispose();
+    super.dispose();
+  }
+
+  Widget _buildInputSourceSettings() {
     return Card(
       color: AppTheme.tertiaryBlack,
       elevation: 0,
@@ -266,48 +148,213 @@ class _SettingsScreenState extends State<SettingsScreen> {
           children: [
             Row(
               children: [
-                Icon(Icons.bluetooth,
+                Icon(Icons.input, color: Theme.of(context).colorScheme.primary),
-                    color: Theme.of(context).colorScheme.primary),
                 const SizedBox(width: 12),
-                const Text('蓝牙设备', style: AppTheme.titleMedium),
+                const Text('信号源设置', style: AppTheme.titleMedium),
               ],
             ),
             const SizedBox(height: 16),
-            TextField(
+
-              controller: _deviceNameController,
+
-              decoration: InputDecoration(
+            Row(
-                labelText: '设备名称',
+              mainAxisAlignment: MainAxisAlignment.spaceBetween,
-                hintText: '输入设备名称',
+              children: [
-                labelStyle: const TextStyle(color: Colors.white70),
+                const Text('信号源', style: AppTheme.bodyLarge),
-                hintStyle: const TextStyle(color: Colors.white54),
+                DropdownButton<InputSource>(
-                border: OutlineInputBorder(
+                  value: _inputSource,
-                  borderSide: const BorderSide(color: Colors.white54),
+                  items: const [
-                  borderRadius: BorderRadius.circular(12.0),
+                    DropdownMenuItem(
+                      value: InputSource.bluetooth,
+                      child: Text('蓝牙设备', style: AppTheme.bodyMedium),
+                    ),
+                    DropdownMenuItem(
+                      value: InputSource.rtlTcp,
+                      child: Text('RTL-TCP', style: AppTheme.bodyMedium),
+                    ),
+                    DropdownMenuItem(
+                      value: InputSource.audioInput,
+                      child: Text('音频输入', style: AppTheme.bodyMedium),
+                    ),
+                  ],
+                  onChanged: (value) {
+                    if (value != null) {
+                      _switchInputSource(value);
+                    }
+                  },
+                  dropdownColor: AppTheme.secondaryBlack,
+                  style: AppTheme.bodyMedium,
+                  underline: Container(height: 0),
                 ),
-                enabledBorder: OutlineInputBorder(
+              ],
-                  borderSide: const BorderSide(color: Colors.white54),
+            ),
-                  borderRadius: BorderRadius.circular(12.0),
+
+            if (_inputSource == InputSource.bluetooth) ...[
+              const SizedBox(height: 16),
+              TextField(
+                controller: _deviceNameController,
+                decoration: InputDecoration(
+                  labelText: '蓝牙设备名称',
+                  hintText: '输入设备名称',
+                  labelStyle: const TextStyle(color: Colors.white70),
+                  hintStyle: const TextStyle(color: Colors.white54),
+                  border: OutlineInputBorder(
+                    borderSide: const BorderSide(color: Colors.white54),
+                    borderRadius: BorderRadius.circular(12.0),
+                  ),
+                  enabledBorder: OutlineInputBorder(
+                    borderSide: const BorderSide(color: Colors.white54),
+                    borderRadius: BorderRadius.circular(12.0),
+                  ),
+                  focusedBorder: OutlineInputBorder(
+                    borderSide: BorderSide(
+                        color: Theme.of(context).colorScheme.primary),
+                    borderRadius: BorderRadius.circular(12.0),
+                  ),
                 ),
-                focusedBorder: OutlineInputBorder(
+                style: const TextStyle(color: Colors.white),
-                  borderSide:
+                onChanged: (value) {
-                      BorderSide(color: Theme.of(context).colorScheme.primary),
+                  setState(() {
-                  borderRadius: BorderRadius.circular(12.0),
+                    _deviceName = value;
+                  });
+                  _saveSettings();
+                },
+              ),
+            ],
+
+            if (_inputSource == InputSource.rtlTcp) ...[
+              const SizedBox(height: 16),
+              TextField(
+                decoration: InputDecoration(
+                  labelText: '服务器地址',
+                  hintText: '127.0.0.1',
+                  labelStyle: const TextStyle(color: Colors.white70),
+                  hintStyle: const TextStyle(color: Colors.white54),
+                  border: OutlineInputBorder(
+                    borderSide: const BorderSide(color: Colors.white54),
+                    borderRadius: BorderRadius.circular(12.0),
+                  ),
+                  enabledBorder: OutlineInputBorder(
+                    borderSide: const BorderSide(color: Colors.white54),
+                    borderRadius: BorderRadius.circular(12.0),
+                  ),
+                  focusedBorder: OutlineInputBorder(
+                    borderSide: BorderSide(
+                        color: Theme.of(context).colorScheme.primary),
+                    borderRadius: BorderRadius.circular(12.0),
+                  ),
+                ),
+                style: const TextStyle(color: Colors.white),
+                controller: _rtlTcpHostController,
+                onChanged: (value) {
+                  setState(() {
+                    _rtlTcpHost = value;
+                  });
+                  _saveSettings();
+                },
+              ),
+              const SizedBox(height: 16),
+              TextField(
+                decoration: InputDecoration(
+                  labelText: '服务器端口',
+                  hintText: '14423',
+                  labelStyle: const TextStyle(color: Colors.white70),
+                  hintStyle: const TextStyle(color: Colors.white54),
+                  border: OutlineInputBorder(
+                    borderSide: const BorderSide(color: Colors.white54),
+                    borderRadius: BorderRadius.circular(12.0),
+                  ),
+                  enabledBorder: OutlineInputBorder(
+                    borderSide: const BorderSide(color: Colors.white54),
+                    borderRadius: BorderRadius.circular(12.0),
+                  ),
+                  focusedBorder: OutlineInputBorder(
+                    borderSide: BorderSide(
+                        color: Theme.of(context).colorScheme.primary),
+                    borderRadius: BorderRadius.circular(12.0),
+                  ),
+                ),
+                style: const TextStyle(color: Colors.white),
+                controller: _rtlTcpPortController,
+                keyboardType: TextInputType.number,
+                onChanged: (value) {
+                  setState(() {
+                    _rtlTcpPort = value;
+                  });
+                  _saveSettings();
+                },
+              ),
+              const SizedBox(height: 16),
+              SizedBox(
+                width: double.infinity,
+                child: ElevatedButton.icon(
+                  onPressed: () {
+                    RtlTcpService()
+                        .connect(host: _rtlTcpHost, port: _rtlTcpPort);
+                  },
+                  icon: const Icon(Icons.refresh),
+                  label: const Text("重新连接 RTL-TCP"),
+                  style: ElevatedButton.styleFrom(
+                    backgroundColor: AppTheme.secondaryBlack,
+                    foregroundColor: Colors.white,
+                    padding: const EdgeInsets.symmetric(vertical: 12),
+                    shape: RoundedRectangleBorder(
+                      borderRadius: BorderRadius.circular(12),
+                    ),
+                  ),
+                ),
+              )
+            ],
+
+            if (_inputSource == InputSource.audioInput) ...[
+              const SizedBox(height: 16),
+              Container(
+                padding: const EdgeInsets.all(12),
+                decoration: BoxDecoration(
+                  color: Colors.blue.withOpacity(0.1),
+                  borderRadius: BorderRadius.circular(8),
+                  border: Border.all(color: Colors.blue.withOpacity(0.3)),
+                ),
+                child: const Row(
+                  children: [
+                    Icon(Icons.mic, color: Colors.blue),
+                    SizedBox(width: 12),
+                    Expanded(
+                      child: Text(
+                        '音频解调已启用。请通过音频线 (Line-in) 或麦克风输入信号。',
+                        style: TextStyle(color: Colors.white70, fontSize: 13),
+                      ),
+                    ),
+                  ],
                 ),
               ),
-              style: const TextStyle(color: Colors.white),
+            ],
-              onChanged: (value) {
-                setState(() {
-                  _deviceName = value;
-                });
-                _saveSettings();
-              },
-            ),
           ],
         ),
       ),
     );
   }
 
+  @override
+  Widget build(BuildContext context) {
+    return SingleChildScrollView(
+      padding: const EdgeInsets.all(20.0),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          _buildInputSourceSettings(),
+          const SizedBox(height: 20),
+          _buildAppSettings(),
+          const SizedBox(height: 20),
+          _buildMergeSettings(),
+          const SizedBox(height: 20),
+          _buildDataManagement(),
+          const SizedBox(height: 20),
+          _buildAboutSection(),
+        ],
+      ),
+    );
+  }
+
   Widget _buildAppSettings() {
     return Card(
       color: AppTheme.tertiaryBlack,
@@ -490,86 +537,80 @@ class _SettingsScreenState extends State<SettingsScreen> {
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
                   const SizedBox(height: 16),
-                  const Text('分组方式', style: AppTheme.bodyLarge),
+                  Row(
-                  const SizedBox(height: 8),
+                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
-                  DropdownButtonFormField<GroupBy>(
+                    children: [
-                    initialValue: _groupBy,
+                      const Text('分组方式', style: AppTheme.bodyLarge),
-                    items: const [
+                      DropdownButton<GroupBy>(
-                      DropdownMenuItem(
+                        value: _groupBy,
-                          value: GroupBy.trainOnly,
+                        items: const [
-                          child: Text('仅车次号', style: AppTheme.bodyMedium)),
+                          DropdownMenuItem(
-                      DropdownMenuItem(
+                              value: GroupBy.trainOnly,
-                          value: GroupBy.locoOnly,
+                              child: Text('仅车次号', style: AppTheme.bodyMedium)),
-                          child: Text('仅机车号', style: AppTheme.bodyMedium)),
+                          DropdownMenuItem(
-                      DropdownMenuItem(
+                              value: GroupBy.locoOnly,
-                          value: GroupBy.trainOrLoco,
+                              child: Text('仅机车号', style: AppTheme.bodyMedium)),
-                          child: Text('车次号或机车号', style: AppTheme.bodyMedium)),
+                          DropdownMenuItem(
-                      DropdownMenuItem(
+                              value: GroupBy.trainOrLoco,
-                          value: GroupBy.trainAndLoco,
+                              child: Text('车次号或机车号', style: AppTheme.bodyMedium)),
-                          child: Text('车次号与机车号', style: AppTheme.bodyMedium)),
+                          DropdownMenuItem(
-                    ],
+                              value: GroupBy.trainAndLoco,
-                    onChanged: (value) {
+                              child: Text('车次号与机车号', style: AppTheme.bodyMedium)),
-                      if (value != null) {
+                        ],
-                        setState(() {
+                        onChanged: (value) {
-                          _groupBy = value;
+                          if (value != null) {
-                        });
+                            setState(() {
-                        _saveSettings();
+                              _groupBy = value;
-                      }
+                            });
-                    },
+                            _saveSettings();
-                    decoration: InputDecoration(
+                          }
-                      filled: true,
+                        },
-                      fillColor: AppTheme.secondaryBlack,
+                        dropdownColor: AppTheme.secondaryBlack,
-                      border: OutlineInputBorder(
+                        style: AppTheme.bodyMedium,
-                        borderRadius: BorderRadius.circular(12.0),
+                        underline: Container(height: 0),
-                        borderSide: BorderSide.none,
                       ),
-                    ),
+                    ],
-                    dropdownColor: AppTheme.secondaryBlack,
-                    style: AppTheme.bodyMedium,
                   ),
                   const SizedBox(height: 16),
-                  const Text('时间窗口', style: AppTheme.bodyLarge),
+                  Row(
-                  const SizedBox(height: 8),
+                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
-                  DropdownButtonFormField<TimeWindow>(
+                    children: [
-                    initialValue: _timeWindow,
+                      const Text('时间窗口', style: AppTheme.bodyLarge),
-                    items: const [
+                      DropdownButton<TimeWindow>(
-                      DropdownMenuItem(
+                        value: _timeWindow,
-                          value: TimeWindow.oneHour,
+                        items: const [
-                          child: Text('1小时内', style: AppTheme.bodyMedium)),
+                          DropdownMenuItem(
-                      DropdownMenuItem(
+                              value: TimeWindow.oneHour,
-                          value: TimeWindow.twoHours,
+                              child: Text('1小时内', style: AppTheme.bodyMedium)),
-                          child: Text('2小时内', style: AppTheme.bodyMedium)),
+                          DropdownMenuItem(
-                      DropdownMenuItem(
+                              value: TimeWindow.twoHours,
-                          value: TimeWindow.sixHours,
+                              child: Text('2小时内', style: AppTheme.bodyMedium)),
-                          child: Text('6小时内', style: AppTheme.bodyMedium)),
+                          DropdownMenuItem(
-                      DropdownMenuItem(
+                              value: TimeWindow.sixHours,
-                          value: TimeWindow.twelveHours,
+                              child: Text('6小时内', style: AppTheme.bodyMedium)),
-                          child: Text('12小时内', style: AppTheme.bodyMedium)),
+                          DropdownMenuItem(
-                      DropdownMenuItem(
+                              value: TimeWindow.twelveHours,
-                          value: TimeWindow.oneDay,
+                              child: Text('12小时内', style: AppTheme.bodyMedium)),
-                          child: Text('24小时内', style: AppTheme.bodyMedium)),
+                          DropdownMenuItem(
-                      DropdownMenuItem(
+                              value: TimeWindow.oneDay,
-                          value: TimeWindow.unlimited,
+                              child: Text('24小时内', style: AppTheme.bodyMedium)),
-                          child: Text('不限时间', style: AppTheme.bodyMedium)),
+                          DropdownMenuItem(
-                    ],
+                              value: TimeWindow.unlimited,
-                    onChanged: (value) {
+                              child: Text('不限时间', style: AppTheme.bodyMedium)),
-                      if (value != null) {
+                        ],
-                        setState(() {
+                        onChanged: (value) {
-                          _timeWindow = value;
+                          if (value != null) {
-                        });
+                            setState(() {
-                        _saveSettings();
+                              _timeWindow = value;
-                      }
+                            });
-                    },
+                            _saveSettings();
-                    decoration: InputDecoration(
+                          }
-                      filled: true,
+                        },
-                      fillColor: AppTheme.secondaryBlack,
+                        dropdownColor: AppTheme.secondaryBlack,
-                      border: OutlineInputBorder(
+                        style: AppTheme.bodyMedium,
-                        borderRadius: BorderRadius.circular(12.0),
+                        underline: Container(height: 0),
-                        borderSide: BorderSide.none,
                       ),
-                    ),
+                    ],
-                    dropdownColor: AppTheme.secondaryBlack,
-                    style: AppTheme.bodyMedium,
                   ),
                   const SizedBox(height: 16),
                   Row(
@@ -712,15 +753,13 @@ class _SettingsScreenState extends State<SettingsScreen> {
     );
   }
 
-  String _formatFileSize(int bytes) {
+  Future<void> _loadRecordCount() async {
-    if (bytes < 1024) return '$bytes B';
+    final count = await _databaseService.getRecordCount();
-    if (bytes < 1024 * 1024) return '${(bytes / 1024).toStringAsFixed(1)} KB';
+    if (mounted) {
-    return '${(bytes / 1024 / 1024).toStringAsFixed(1)} MB';
+      setState(() {
-  }
+        _recordCount = count;
-
+      });
-  String _formatDateTime(DateTime dateTime) {
+    }
-    return '${dateTime.year}-${dateTime.month.toString().padLeft(2, '0')}-${dateTime.day.toString().padLeft(2, '0')} '
-        '${dateTime.hour.toString().padLeft(2, '0')}:${dateTime.minute.toString().padLeft(2, '0')}';
   }
 
   Future<String> _getAppVersion() async {
@@ -910,6 +949,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
         'mergeRecordsEnabled': 0,
         'groupBy': 'trainAndLoco',
         'timeWindow': 'unlimited',
+        'inputSource': 'bluetooth',
       });
 
       Navigator.pop(context);

lib/services/audio_input_service.dart

@@ -0,0 +1,49 @@
+import 'package:flutter/services.dart';
+import 'package:permission_handler/permission_handler.dart';
+import 'dart:developer' as developer;
+
+class AudioInputService {
+  static final AudioInputService _instance = AudioInputService._internal();
+  factory AudioInputService() => _instance;
+  AudioInputService._internal();
+
+  static const _methodChannel = MethodChannel('org.noxylva.lbjconsole/audio_input');
+  
+  bool _isListening = false;
+  bool get isListening => _isListening;
+
+  Future<bool> startListening() async {
+    if (_isListening) return true;
+
+    var status = await Permission.microphone.status;
+    if (!status.isGranted) {
+      status = await Permission.microphone.request();
+      if (!status.isGranted) {
+        developer.log('Microphone permission denied', name: 'AudioInput');
+        return false;
+      }
+    }
+
+    try {
+      await _methodChannel.invokeMethod('start');
+      _isListening = true;
+      developer.log('Audio input started', name: 'AudioInput');
+      return true;
+    } on PlatformException catch (e) {
+      developer.log('Failed to start audio input: ${e.message}', name: 'AudioInput');
+      return false;
+    }
+  }
+
+  Future<void> stopListening() async {
+    if (!_isListening) return;
+    
+    try {
+      await _methodChannel.invokeMethod('stop');
+      _isListening = false;
+      developer.log('Audio input stopped', name: 'AudioInput');
+    } catch (e) {
+      developer.log('Error stopping audio input: $e', name: 'AudioInput');
+    }
+  }
+}

lib/services/database_service.dart

@@ -4,16 +4,23 @@ import 'package:path/path.dart';
 import 'package:path_provider/path_provider.dart';
 import 'dart:io';
 import 'dart:convert';
+import 'dart:developer' as developer;
 
 import 'package:lbjconsole/models/train_record.dart';
 
+enum InputSource {
+  bluetooth,
+  rtlTcp,
+  audioInput
+}
+
 class DatabaseService {
   static final DatabaseService instance = DatabaseService._internal();
   factory DatabaseService() => instance;
   DatabaseService._internal();
 
   static const String _databaseName = 'train_database';
-  static const _databaseVersion = 8;
+  static const _databaseVersion = 9;
 
   static const String trainRecordsTable = 'train_records';
   static const String appSettingsTable = 'app_settings';
@@ -63,6 +70,8 @@ class DatabaseService {
   }
 
   Future<void> _onUpgrade(Database db, int oldVersion, int newVersion) async {
+    developer.log('Database upgrading from $oldVersion to $newVersion', name: 'Database');
+
     if (oldVersion < 2) {
       await db.execute(
           'ALTER TABLE $appSettingsTable ADD COLUMN hideTimeOnlyRecords INTEGER NOT NULL DEFAULT 0');
@@ -97,6 +106,27 @@ class DatabaseService {
       await db.execute(
           'ALTER TABLE $appSettingsTable ADD COLUMN rtlTcpPort TEXT NOT NULL DEFAULT "14423"');
     }
+    if (oldVersion < 9) {
+      await db.execute(
+          'ALTER TABLE $appSettingsTable ADD COLUMN inputSource TEXT NOT NULL DEFAULT "bluetooth"');
+      
+      try {
+        final List<Map<String, dynamic>> results = await db.query(appSettingsTable, columns: ['rtlTcpEnabled'], where: 'id = 1');
+        if (results.isNotEmpty) {
+          final int rtlTcpEnabled = results.first['rtlTcpEnabled'] as int? ?? 0;
+          if (rtlTcpEnabled == 1) {
+            await db.update(
+              appSettingsTable, 
+              {'inputSource': 'rtlTcp'},
+              where: 'id = 1'
+            );
+            developer.log('Migrated V8 settings: inputSource set to rtlTcp', name: 'Database');
+          }
+        }
+      } catch (e) {
+        developer.log('Migration V8->V9 data update failed: $e', name: 'Database');
+      }
+    }
   }
 
   Future<void> _onCreate(Database db, int version) async {
@@ -150,7 +180,8 @@ class DatabaseService {
         mapSettingsTimestamp INTEGER,
         rtlTcpEnabled INTEGER NOT NULL DEFAULT 0,
         rtlTcpHost TEXT NOT NULL DEFAULT '127.0.0.1',
-        rtlTcpPort TEXT NOT NULL DEFAULT '14423'
+        rtlTcpPort TEXT NOT NULL DEFAULT '14423',
+        inputSource TEXT NOT NULL DEFAULT 'bluetooth'
       )
     ''');
 
@@ -177,11 +208,12 @@ class DatabaseService {
       'groupBy': 'trainAndLoco',
       'timeWindow': 'unlimited',
       'mapTimeFilter': 'unlimited',
-        'hideUngroupableRecords': 0,
+      'hideUngroupableRecords': 0,
-        'mapSettingsTimestamp': null,
+      'mapSettingsTimestamp': null,
-        'rtlTcpEnabled': 0,
+      'rtlTcpEnabled': 0,
-        'rtlTcpHost': '127.0.0.1',
+      'rtlTcpHost': '127.0.0.1',
-        'rtlTcpPort': '14423',
+      'rtlTcpPort': '14423',
+      'inputSource': 'bluetooth',
     });
   }
 
@@ -409,14 +441,13 @@ class DatabaseService {
   StreamSubscription<void> onSettingsChanged(
       Function(Map<String, dynamic>) listener) {
     _settingsListeners.add(listener);
-    return Stream.value(null).listen((_) {})
+    return _SettingsListenerSubscription(() {
-      ..onData((_) {})
+      _settingsListeners.remove(listener);
-      ..onDone(() {
+    });
-        _settingsListeners.remove(listener);
-      });
   }
 
   void _notifySettingsChanged(Map<String, dynamic> settings) {
+    print('[Database] Notifying ${_settingsListeners.length} settings listeners');
     for (final listener in _settingsListeners) {
       listener(settings);
     }
@@ -499,3 +530,39 @@ class DatabaseService {
     }
   }
 }
+
+class _SettingsListenerSubscription implements StreamSubscription<void> {
+  final void Function() _onCancel;
+  bool _isCanceled = false;
+
+  _SettingsListenerSubscription(this._onCancel);
+
+  @override
+  Future<void> cancel() async {
+    if (!_isCanceled) {
+      _isCanceled = true;
+      _onCancel();
+    }
+  }
+
+  @override
+  void onData(void Function(void data)? handleData) {}
+
+  @override
+  void onDone(void Function()? handleDone) {}
+
+  @override
+  void onError(Function? handleError) {}
+
+  @override
+  void pause([Future<void>? resumeSignal]) {}
+
+  @override
+  void resume() {}
+
+  @override
+  bool get isPaused => false;
+
+  @override
+  Future<E> asFuture<E>([E? futureValue]) => Future.value(futureValue);
+}