Implement bluetooth autospawn / autoplayback feature #235

app/src/main/AndroidManifest.xml

@@ -8,6 +8,11 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
 
+    <!-- Bluetooth auto-connect functionality -->
+    <uses-permission android:name="android.permission.BLUETOOTH" android:maxSdkVersion="30" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" android:minSdkVersion="31" />
+    <uses-feature android:name="android.hardware.bluetooth" android:required="false"/>
+
     <!-- Work around ExoPlayer requiring network permissions we do not use -->
     <uses-permission
         android:name="android.permission.ACCESS_NETWORK_STATE"
@@ -102,6 +107,15 @@
             </intent-filter>
         </receiver>
 
+        <!-- Auxio's auto-playback on BT connect receiver. -->
+        <receiver
+            android:name=".playback.system.BluetoothConnectReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.bluetooth.a2dp.profile.action.CONNECTION_STATE_CHANGED" />
+            </intent-filter>
+        </receiver>
+
         <!-- Auxio's one and only AppWidget. -->
         <receiver
             android:name=".widgets.WidgetProvider"

app/src/main/java/org/oxycblt/auxio/MainActivity.kt

@@ -23,6 +23,7 @@ import android.os.Bundle
 import android.view.View
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.app.AppCompatDelegate
+import androidx.core.app.ActivityCompat
 import androidx.core.view.WindowCompat
 import androidx.core.view.updatePadding
 import org.oxycblt.auxio.databinding.ActivityMainBinding
@@ -73,6 +74,18 @@ class MainActivity : AppCompatActivity() {
         if (!startIntentAction(intent)) {
             playbackModel.startAction(InternalPlayer.Action.RestoreState)
         }
+
+        // Check bluetooth connect permissions if required for bt autoconnect feature
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+            val settings = Settings(this)
+            if (settings.bluetoothAutoplay) {
+                ActivityCompat.requestPermissions(
+                    this,
+                    arrayOf<String>(android.Manifest.permission.BLUETOOTH_CONNECT),
+                    BLUETOOTH_PERMISSION_REQUEST_ID
+                )
+            }
+        }
     }
 
     override fun onNewIntent(intent: Intent?) {
@@ -141,5 +154,6 @@ class MainActivity : AppCompatActivity() {
 
     companion object {
         private const val KEY_INTENT_USED = BuildConfig.APPLICATION_ID + ".key.FILE_INTENT_USED"
+        private const val BLUETOOTH_PERMISSION_REQUEST_ID = 1337 * 42;
     }
 }

app/src/main/java/org/oxycblt/auxio/playback/system/BluetoothConnectReceiver.kt

@@ -0,0 +1,33 @@
+package org.oxycblt.auxio.playback.system
+
+import android.bluetooth.BluetoothProfile
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import org.oxycblt.auxio.playback.state.InternalPlayer
+import org.oxycblt.auxio.playback.state.PlaybackStateManager
+import org.oxycblt.auxio.settings.Settings
+
+class BluetoothConnectReceiver : BroadcastReceiver() {
+    override fun onReceive(context: Context, intent: Intent) {
+        if (intent.action == android.bluetooth.BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED) {
+            val newState = intent.getIntExtra(BluetoothProfile.EXTRA_STATE, BluetoothProfile.STATE_DISCONNECTED)
+            if (newState == BluetoothProfile.STATE_CONNECTED) {
+                val settings = Settings(context)
+                if (settings.bluetoothAutoplay) {
+                    // make sure required services are up and running
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                        context.startForegroundService(Intent(context, PlaybackService::class.java))
+                    } else {
+                        context.startService(Intent(context, PlaybackService::class.java))
+                    }
+                    // start playback
+                    val playbackManager = PlaybackStateManager.getInstance()
+                    playbackManager.startAction(InternalPlayer.Action.RestoreState)
+                    playbackManager.changePlaying(true)
+                }
+            }
+        }
+    }
+}

app/src/main/java/org/oxycblt/auxio/settings/Settings.kt

@@ -135,6 +135,10 @@ class Settings(private val context: Context, private val callback: Callback? = n
     val headsetAutoplay: Boolean
         get() = inner.getBoolean(context.getString(R.string.set_key_headset_autoplay), false)
 
+    /** Whether a connected bluetooth device should cause Auxio to spawn and start playback */
+    val bluetoothAutoplay: Boolean
+        get() = inner.getBoolean(context.getString(R.string.set_key_bluetooth_autoplay), false)
+
     /** The current ReplayGain configuration */
     val replayGainMode: ReplayGainMode
         get() =

app/src/main/java/org/oxycblt/auxio/settings/SettingsListFragment.kt

@@ -17,6 +17,8 @@
  
 package org.oxycblt.auxio.settings
 
+import android.app.Activity
+import android.os.Build
 import android.os.Bundle
 import android.view.View
 import androidx.annotation.DrawableRes
@@ -44,6 +46,8 @@ import org.oxycblt.auxio.util.isNight
 import org.oxycblt.auxio.util.logD
 import org.oxycblt.auxio.util.showToast
 import org.oxycblt.auxio.util.systemBarInsetsCompat
+import java.security.Permission
+import java.util.jar.Manifest
 
 /**
  * The actual fragment containing the settings menu. Inherits [PreferenceFragmentCompat].

app/src/main/res/values-de/strings.xml

@@ -57,6 +57,8 @@
     <string name="set_audio">Audio</string>
     <string name="set_headset_autoplay">Kopfhörer: automatische Wiedergabe</string>
     <string name="set_headset_autoplay_desc">Beginne die Wiedergabe immer, wenn Kopfhörer verbunden sind (funktioniert nicht auf allen Geräten)</string>
+    <string name="set_bluetooth_autoplay">Bluetooth: automatische Wiedergabe</string>
+    <string name="set_bluetooth_autoplay_desc">Auxio starten und Wiedergabe fortführen, sobald ein Bluetooth Audio fähiges Gerät verbunden wurde</string>
     <string name="set_replay_gain">ReplayGain-Strategie</string>
     <string name="set_pre_amp">ReplayGain-Prälautverstärkung</string>
     <string name="set_pre_amp_desc">Während der Musikwiedergabe, trifft die Prälautverstärkung dem aktuellem Abgleich zu</string>

app/src/main/res/values/settings.xml

@@ -15,6 +15,7 @@
     <string name="set_key_alt_notif_action" translatable="false">KEY_ALT_NOTIF_ACTION</string>
 
     <string name="set_key_headset_autoplay" translatable="false">auxio_headset_autoplay</string>
+    <string name="set_key_bluetooth_autoplay" translatable="false">auxio_bluetooth_autoplay</string>
     <string name="set_key_replay_gain" translatable="false">auxio_replay_gain</string>
     <string name="set_key_pre_amp" translatable="false">auxio_pre_amp</string>
     <string name="set_key_pre_amp_with" translatable="false">auxio_pre_amp_with</string>

app/src/main/res/values/strings.xml

@@ -180,6 +180,8 @@
     <string name="set_audio">Audio</string>
     <string name="set_headset_autoplay">Headset autoplay</string>
     <string name="set_headset_autoplay_desc">Always start playing when a headset is connected (may not work on all devices)</string>
+    <string name="set_bluetooth_autoplay">Bluetooth autoplay</string>
+    <string name="set_bluetooth_autoplay_desc">A connected bluetooth audio device causes Auxio to spawn and start playback</string>
     <string name="set_replay_gain">ReplayGain strategy</string>
     <string name="set_replay_gain_track">Prefer track</string>
     <string name="set_replay_gain_album">Prefer album</string>

app/src/main/res/xml/prefs_main.xml

@@ -74,6 +74,11 @@
             app:summary="@string/set_headset_autoplay_desc"
             app:title="@string/set_headset_autoplay" />
 
+        <SwitchPreferenceCompat
+            app:key="@string/set_key_bluetooth_autoplay"
+            app:summary="@string/set_bluetooth_autoplay_desc"
+            app:title="@string/set_bluetooth_autoplay" />
+
         <org.oxycblt.auxio.settings.ui.IntListPreference
             app:defaultValue="@integer/replay_gain_dynamic"
             app:entries="@array/entries_replay_gain"