Question

这是我的主要活动。 package com.example.simeon.cookingbook.activities;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;

import com.example.simeon.cookingbook.R;
import com.example.simeon.cookingbook.services.BackgroundMusic;

public class MainActivity extends AppCompatActivity {
    Intent srv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        this.srv = new Intent(this, BackgroundMusic.class);
        startService(srv);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        stopService(srv);
    }

    @Override
    protected void onPause() {
        super.onPause();
        stopService(srv);
    }

    @Override
    protected void onStop() {
        super.onStop();
        stopService(srv);
    }

    @Override
    protected void onRestart() {
        super.onRestart();
        startService(srv);
    }

    @Override
    protected void onResume() {
        super.onResume();
        startService(srv);
    }
}

那是BackgroundMusic服务。

package com.example.simeon.cookingbook.services;

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

import com.example.simeon.cookingbook.R;

public class BackgroundMusic extends Service {
    private static final String TAG = null;
    public MediaPlayer player;

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

    @Override
    public void onCreate() {
        super.onCreate();
        player = MediaPlayer.create(this, R.raw.background);
        player.setLooping(true); // Set looping
        player.setVolume(100,100);
    }

    public int onStartCommand(Intent intent, int flags, int startId) {
        player.start();
        return START_STICKY;
    }
}

我有其他活动，我希望在我的应用程序打开时听到音乐，但是当它转到后台时，我不想让音乐继续播放。我尝试使用BaseActivityClass并阅读了很多内容，但仍然没有解决方案。请帮助，提前谢谢。

Answer 1

使用完MediaPlayer后，您需要使用release()方法发布它。我想你服务的onDestroy()方法是个好地方：

public class BackgroundMusic extends Service {
    private static final String TAG = null;
    public MediaPlayer player;

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

    @Override
    public void onCreate() {
        super.onCreate();
        player = MediaPlayer.create(this, R.raw.background);
        player.setLooping(true); // Set looping
        player.setVolume(100,100);
    }

    public int onStartCommand(Intent intent, int flags, int startId) {
        player.start();
        return START_STICKY;
    }

    public int onDestroy() {
        player.release();
    }


}

我想要的时候无法停止并开始服务

1 个答案: