How to write Background Service in Android 6.0 and above? - android-service

Question

I have created a background service and that service is working fine in below Android 6.0 when I kill app.
Also working in Android 6.0 and above but only when I minimize app.
When I kill app in Android 6.0 and above service also kill and not get restart and also not get start on BOOT_COMPLETE.
What to DO?
Can I get a simple example.
I tried this:
MyService.java
public class MyService extends Service {
private MediaPlayer player;
#Nullable
#Override
public IBinder onBind(Intent intent) {
throw new UnsupportedOperationException("Not yet started");
}
public A_ExampleMyService() {
super();
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
player = MediaPlayer.create(this, Settings.System.DEFAULT_RINGTONE_URI);
player.setLooping(true);
player.start();
return START_STICKY;
}
#Override
public void onTaskRemoved(Intent rootIntent) {
Intent restartServiceIntent = new Intent(getApplicationContext(), this.getClass());
restartServiceIntent.setPackage(getPackageName());
startService(restartServiceIntent);
super.onTaskRemoved(rootIntent);
}
}
MyActivity.java
public class MyActivity extends Activity {
private Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.a_example_activity);
this.context = this;
Intent background = new Intent(MyActivity.this,MyService.class);
context.startService(background);
}
}
manifest.xml
<manifest>
<application>
<service>
<android:name=".MyService">
<android:enabled="true">
<android:exported="true"/>
</application>
</manifest>