Sample implementation for InfiniteWakefulIntentService

TextToSpeechService.java

import android.content.Intent;

import com.announcify.uberall.droid.util.TextToSpeechHelper;

public class TextToSpeechService extends InfiniteWakelockIntentService {

    private TextToSpeechHelper helper;
    
    public TextToSpeechService() {
        super("Announcify - Text-To-Speech");
    }
    
    @Override
    public void onCreate() {
        super.onCreate();
        
        helper = new TextToSpeechHelper(this);
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        helper.speak("hello");
    }
    
    @Override
    protected boolean isFinished() {
        return helper != null && helper.isReady() && helper.isFinished() && !helper.isSpeaking();
    }
    
    @Override
    public void onDestroy() {
        helper.stop();
        
        super.onDestroy();
    }
}

This isn't very helpful since you don't know what TextToSpeechHelper is and does, but I think it gives you an idea of how isFinished() should be implemented: don't return true until you have finished all work, e.g. waiting for callbacks and the like.