From 49837033755dbfc9da951892a3a73c4ba4541602 Mon Sep 17 00:00:00 2001
From: Sam Bazley <sambazley@fastmail.com>
Date: Tue, 4 Jan 2022 11:19:52 +0000
Subject: [PATCH] Android: Detect output change with
 ACTION_AUDIO_BECOMING_NOISY

Improves the changes made in 57687779befd796b79b1a569daf9e48eac3aea26 by
using AudioManager.ACTION_AUDIO_BECOMING_NOISY rather than listening for
wired headset unplug events or Bluetooth headset disconnect events. This
method is more flexible, allowing the feature to work on other types of
audio output device, as well as Bluetooth devices that don't set their
device class correctly. This change also has the benefit of being more
responsive, pausing the audio before it is rerouted to the built-in
speaker.

https://developer.android.com/guide/topics/media-apps/volume-and-earphones
---
 android/AndroidManifest.xml |  3 ---
 android/src/Main.java       | 21 +++++----------------
 2 files changed, 5 insertions(+), 19 deletions(-)

diff --git a/android/AndroidManifest.xml b/android/AndroidManifest.xml
index c375aa58b..46533971c 100644
--- a/android/AndroidManifest.xml
+++ b/android/AndroidManifest.xml
@@ -17,8 +17,6 @@
   <uses-permission android:name="android.permission.INTERNET"/>
   <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
   <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
-  <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
-  <uses-permission android:name="android.permission.BLUETOOTH" />
 
   <application android:allowBackup="true"
                android:requestLegacyExternalStorage="true"
@@ -43,7 +41,6 @@
     <receiver android:name=".Receiver">
       <intent-filter>
         <action android:name="android.intent.action.BOOT_COMPLETED" />
-        <action android:name="android.intent.action.HEADSET_PLUG" />
       </intent-filter>
     </receiver>
     <service android:name=".Main" android:process=":main"/>
diff --git a/android/src/Main.java b/android/src/Main.java
index 4f314f8aa..e40f03195 100644
--- a/android/src/Main.java
+++ b/android/src/Main.java
@@ -24,14 +24,13 @@ import android.app.Notification;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.app.Service;
-import android.bluetooth.BluetoothDevice;
-import android.bluetooth.BluetoothClass;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.ServiceConnection;
+import android.media.AudioManager;
 import android.os.Build;
 import android.os.IBinder;
 import android.os.PowerManager;
@@ -200,24 +199,14 @@ public class Main extends Service implements Runnable {
 			return;
 
 		IntentFilter filter = new IntentFilter();
-		filter.addAction(Intent.ACTION_HEADSET_PLUG);
-		filter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECT_REQUESTED);
-		filter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
+		filter.addAction(AudioManager.ACTION_AUDIO_BECOMING_NOISY);
 		registerReceiver(new BroadcastReceiver() {
 			@Override
 			public void onReceive(Context context, Intent intent) {
-				if (!mPauseOnHeadphonesDisconnect) {
+				if (!mPauseOnHeadphonesDisconnect)
 					return;
-				}
-
-				if (intent.getAction().equals(Intent.ACTION_HEADSET_PLUG)) {
-					if (intent.hasExtra("state") && intent.getIntExtra("state", 0) == 0)
-						pause();
-				} else {
-					BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
-					if (device.getBluetoothClass().hasService(BluetoothClass.Service.AUDIO))
-						pause();
-				}
+				if (intent.getAction() == AudioManager.ACTION_AUDIO_BECOMING_NOISY)
+					pause();
 			}
 		}, filter);