MediaPlayer音乐播放器简单使用

使用Service+MediaPlayer播放音乐

res/raw/文件夹下存放mp3资源： 。略

MainActivity布局代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.mrzhao.servicemusicdemo.MainActivity">

    <Button
        android:id="@+id/start_bt"
        android:layout_width="match_parent"
        android:text="开始播放"
        android:onClick="onClick"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/pause_bt"
        android:layout_width="match_parent"
        android:text="暂停播放"
        android:onClick="onClick"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/stop_bt"
        android:layout_width="match_parent"
        android:text="停止播放"
        android:onClick="onClick"
        android:layout_height="wrap_content" />

</LinearLayout>

定义一个服务Service：

public class MusicService extends Service {
    private MediaPlayer mediaPlayer;

    public MusicService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        throw new UnsupportedOperationException("Not yet implemented");
    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        int type = intent.getIntExtra("type", 0);
        switch (type) {
            case 1:
                //开始播放音乐
                startPlay();
                break;
            case 2:
                //暂停
                pausePlay();
                break;
            case 3:
                //停止
                stopPlay();
                break;
        }
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        //服务停止的时候停止播放并释放资源
        stopPlay();
    }


    /**
     * 开始播放
     */
    public void startPlay() {
        if (mediaPlayer == null){
            //初始化音乐播放器
            mediaPlayer = MediaPlayer.create(this, R.raw.pfzl);
        }

        if (mediaPlayer != null && !mediaPlayer.isPlaying()) {
            mediaPlayer.start();
        }
    }

    /**
     * 暂停播放
     */
    public void pausePlay() {
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            mediaPlayer.pause();
        }
    }

    /**
     * 停止播放
     */
    public void stopPlay() {
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            mediaPlayer.stop();
            //停止的时候释放资源
            mediaPlayer.release();
            mediaPlayer = null;
        }
    }
}

MainActivity 文件：

public class MainActivity extends AppCompatActivity {

    private Intent intent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        intent = new Intent(this,MusicService.class);
    }

    public void onClick(View view) {
        switch (view.getId()){
            case R.id.start_bt:
                intent.putExtra("type",1);
                break;
            case R.id.pause_bt:
                intent.putExtra("type",2);
                break;
            case R.id.stop_bt:
                intent.putExtra("type",3);
                break;
        }
        startService(intent);
    }
}