Handle bluetooth permission crash during calls.

app/src/main/java/org/thoughtcrime/securesms/webrtc/audio/SignalAudioManager.kt

@@ -98,6 +98,7 @@ sealed class SignalAudioManager(protected val context: Context, protected val ev
   interface EventListener {
     @JvmSuppressWildcards
     fun onAudioDeviceChanged(activeDevice: AudioDevice, devices: Set<AudioDevice>)
+    fun onBluetoothPermissionDenied()
   }
 }
 
@@ -121,6 +122,7 @@ class FullSignalAudioManager(context: Context, eventListener: EventListener?) :
   private var audioDevices: MutableSet<AudioDevice> = mutableSetOf()
   private var defaultAudioDevice: AudioDevice = AudioDevice.EARPIECE
   private var userSelectedAudioDevice: AudioDevice = AudioDevice.NONE
+  private var previousBluetoothState: SignalBluetoothManager.State? = null
 
   private var savedAudioMode = AudioManager.MODE_INVALID
   private var savedIsSpeakerPhoneOn = false
@@ -294,6 +296,11 @@ class FullSignalAudioManager(context: Context, eventListener: EventListener?) :
       autoSwitchToBluetooth = false
     }
 
+    if (previousBluetoothState != null && previousBluetoothState != SignalBluetoothManager.State.PERMISSION_DENIED && signalBluetoothManager.state == SignalBluetoothManager.State.PERMISSION_DENIED) {
+      eventListener?.onBluetoothPermissionDenied()
+    }
+    previousBluetoothState = signalBluetoothManager.state
+
     val newAudioDevice: AudioDevice = when {
       audioDevices.contains(userSelectedAudioDevice) -> userSelectedAudioDevice
       audioDevices.contains(defaultAudioDevice) -> defaultAudioDevice

app/src/main/java/org/thoughtcrime/securesms/webrtc/audio/SignalBluetoothManager.kt

@@ -162,7 +162,16 @@ class SignalBluetoothManager(
       return
     }
 
-    val devices: List<BluetoothDevice>? = bluetoothHeadset?.connectedDevices
+    val devices: List<BluetoothDevice>?
+    try {
+      devices = bluetoothHeadset?.connectedDevices
+    } catch (e: SecurityException) {
+      Log.w(TAG, "Unable to get bluetooth devices", e)
+      stop()
+      state = State.PERMISSION_DENIED
+      return
+    }
+
     if (devices == null || devices.isEmpty()) {
       bluetoothDevice = null
       state = State.UNAVAILABLE
@@ -320,6 +329,7 @@ class SignalBluetoothManager(
     DISCONNECTING,
     CONNECTING,
     CONNECTED,
+    PERMISSION_DENIED,
     ERROR;
 
     fun shouldUpdate(): Boolean {