Android comprehensive failproof music service across multiple activities

I know this question has been asked many times before and might seem to be a conglomeration of several questions, but I feel that it is relevant and important to many developers; I need to create a background music Service that can run across multiple activities for my Android game that ends when the application is terminated and pauses in all of the following circumstances:

1. A certain Activity that has its own music is started. (Resume when this Activity finishes. This happens to be an AndEngine activity.)
2. The home screen is pressed and the app is backgrounded, or the application is terminated. Resumes when the app returns to the foreground. Requires use of onUserLeaveHint(). Another helpful link.
3. The phone receives a call and interrupts the app. Resumes when the call has been dealt with. Requires use of TelephonyManager similar to this.
4. The screen is locked. (Resumes after screen has been unlocked.) Requires use of ACTION_USER_PRESENT, which seems to be very problematic.
5. Basically the music pauses whenever the app is not being shown or when the special activity from #1 is being shown to the user.

Above is all of what I need and the information I have pieced together. My current code basically resembles this.

I find it curious that AndEngine manages to have none of these issues with their music, so maybe looking in the source code would help someone looking for an answer. I'm using the last functional GLES1 version from Google Code.

I have taken a look at the following links as well on creating a good music Service:

• Stopping Background Service Music
• http://www.codeproject.com/Articles/258176/Adding-Background-Music-to-Android-App
• Android background music service
• Playing BG Music Across Activities in Android
• http://www.rbgrn.net/content/307-light-racer-20-days-61-64-completion

I would like the solution Service to:

• Minimize the use of BroadcastReceivers and Android Manifest additions/permissions if possible
• Self contained and error checking

Other Notes

• Currently all the activities that require the background music all extend a common special class.
• The music needs to loop but only runs a single track.

Thanks to everyone ahead of time! Best of luck!

Edit - Here are code snippets, feel free to improve or ignore:

Media Player Wrapper

import android.content.SharedPreferences;
import android.media.MediaPlayer;
import android.preference.PreferenceManager;
import android.util.Log;

public class CarefulMediaPlayer {
    final SharedPreferences sp;
    final MediaPlayer mp;
    private boolean isPlaying = false;

    public CarefulMediaPlayer(final MediaPlayer mp, final MusicService ms) {
        sp = PreferenceManager.getDefaultSharedPreferences(ms.getApplicationContext());
        this.mp = mp;
    }

    public void start() {
        if (sp.getBoolean("com.embed.candy.music", true) && !isPlaying) {
            mp.start();
            isPlaying = true;
        }
    }

    public void pause() {
        if (isPlaying) {
            mp.pause();
            isPlaying = false;
        }
    }

    public void stop() {
        isPlaying = false;
        try {
            mp.stop();
            mp.release();
        } catch (final Exception e) {}
    }
}

Music Service

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;

public class MusicService extends Service {
    static CarefulMediaPlayer mPlayer = null;

    @Override
    public IBinder onBind(final Intent arg0) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        final MediaPlayer mp = MediaPlayer.create(this, R.raw.title_music);
        mp.setLooping(true);
        mPlayer = new CarefulMediaPlayer(mp,this);
    }

    @Override
    public int onStartCommand(final Intent intent, final int flags, final int startId) {
        mPlayer.start();
        return 1;
    }

    @Override
    public void onStart(final Intent intent, final int startId) {

    }

    public IBinder onUnBind(final Intent arg0) {
        return null;
    }

    public static void onStop() {
        mPlayer.stop();
    }

    public static void onPause() {
        if (mPlayer!=null) {
            mPlayer.pause();
        }
    }

    public static void onResume() {
        if (mPlayer!=null) {
            mPlayer.start();
        }
    }

    @Override
    public void onDestroy() {
        mPlayer.stop();
        mPlayer = null;
    }

    @Override
    public void onLowMemory() {

    }
}

Improved Base Activity Class

import android.app.Activity;
import android.content.Intent;
import android.os.PowerManager;
import android.telephony.TelephonyManager;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;

public abstract class BetterActivity extends Activity {

    private boolean isHome = true;

    @Override
    protected void onResume() {
        System.gc();
        super.onResume();
        MusicService.onResume();
        isHome = true;
    }

    @Override
    protected void onPause() {
        if (((TelephonyManager)getSystemService(TELEPHONY_SERVICE)).getCallState()==TelephonyManager.CALL_STATE_RINGING
                || !((PowerManager)getSystemService(POWER_SERVICE)).isScreenOn()) {
            MusicService.onPause();
        }
        super.onPause();
        System.gc();
    }

    @Override
    public boolean onKeyDown (final int keyCode, final KeyEvent ke) {
        switch (keyCode) {
        case KeyEvent.KEYCODE_BACK:
            isHome = false;
        default:
            return super.onKeyDown(keyCode, ke);
        }
    }

    @Override
    public void startActivity(final Intent i) {
        isHome = false;
        super.startActivity(i);
    }

    @Override
    protected void onUserLeaveHint() {
        if (isHome) {
            MusicService.onPause();
        }
        super.onUserLeaveHint();
    }

}