增大默认音量

android/app/src/main/java/com/tsmobile/app/voice/VoiceService.kt

@@ -55,7 +55,7 @@ class VoiceService(
     private var playbackGeneration = 0L
     private var activePlaybackTrack: AudioTrack? = null
     @Volatile private var receiveVolume = 1.0f
-    @Volatile private var receiveGain = 2.5f
+    @Volatile private var receiveGain = 5.0f
 
     private val audioManager = context.getSystemService(AudioManager::class.java)
     private var audioFocusRequest: AudioFocusRequest? = null