android: Add intents for service start and stop

org.musicpd.action.StartService
org.musicpd.action.StopService

You can test these actions like:
adb shell am broadcast -a org.musicpd.action.StartService org.musicpd

Calling these from an app like tasker should allow for automation

android/app/src/main/AndroidManifest.xml

@@ -53,6 +53,16 @@
             </intent-filter>
         </receiver>
 
+        <receiver android:name=".AutomationReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="org.musicpd.action.StartService" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="org.musicpd.action.StopService" />
+            </intent-filter>
+        </receiver>
+
         <service
             android:name=".Main" />
     </application>

android/app/src/main/java/org/musicpd/AutomationReceiver.kt

@@ -5,5 +5,20 @@ import android.content.Context
 import android.content.Intent
 
 class AutomationReceiver : BroadcastReceiver() {
-    override fun onReceive(context: Context, intent: Intent) {}
+    override fun onReceive(context: Context, intent: Intent) {
+
+        when(intent.action) {
+            "org.musicpd.action.StartService" -> {
+                val wakelock = Preferences.getBoolean(
+                    context,
+                    Preferences.KEY_WAKELOCK, false
+                )
+                Main.startService(context, wakelock)
+            }
+            "org.musicpd.action.StopService" -> {
+                context.startService(Intent(context, Main::class.java)
+                    .setAction(Main.SHUTDOWN_ACTION))
+            }
+        }
+    }
 }

android/app/src/main/java/org/musicpd/Main.java

@@ -24,10 +24,12 @@ import androidx.annotation.OptIn;
 import androidx.media3.common.util.UnstableApi;
 import androidx.media3.session.MediaSession;
 
+import org.jetbrains.annotations.NotNull;
 import org.musicpd.data.LoggingRepository;
 
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
+import java.util.Objects;
 
 import javax.inject.Inject;
 
@@ -35,8 +37,10 @@ import dagger.hilt.android.AndroidEntryPoint;
 
 @AndroidEntryPoint
 public class Main extends Service implements Runnable {
+
 	private static final String TAG = "Main";
 	private static final String WAKELOCK_TAG = "mpd:wakelockmain";
+
 	private static final int MAIN_STATUS_ERROR = -1;
 	private static final int MAIN_STATUS_STOPPED = 0;
 	private static final int MAIN_STATUS_STARTED = 1;
@@ -57,6 +61,9 @@ public class Main extends Service implements Runnable {
 	@Inject
 	LoggingRepository logging;
 
+	@NotNull
+	public static final String SHUTDOWN_ACTION = "org.musicpd.action.ShutdownMPD";
+
 	static class MainStub extends IMain.Stub {
 		private Main mService;
 		MainStub(Main service) {
@@ -126,9 +133,13 @@ public class Main extends Service implements Runnable {
 
 	@Override
 	public int onStartCommand(Intent intent, int flags, int startId) {
-		start();
+		if (Objects.equals(intent.getAction(), SHUTDOWN_ACTION)) {
-		if (intent != null && intent.getBooleanExtra("wakelock", false))
+			stop();
-			setWakelockEnabled(true);
+		} else {
+			start();
+			if (intent.getBooleanExtra("wakelock", false))
+				setWakelockEnabled(true);
+		}
 		return START_STICKY;
 	}
 
@@ -319,4 +330,9 @@ public class Main extends Service implements Runnable {
 		else
 			context.startService(intent);
 	}
+
+	public static void stopService(Context context) {
+		Intent intent = new Intent(context, Main.class);
+		context.stopService(intent);
+	}
 }