如何在android中的另一个活动中暂停和停止媒体播放器

Question

我正在使用列表视图和自定义适配器列表视图包含歌曲并显示在活动（fayrouz）中，我想在此活动中创建一个按钮来停止媒体播放器。我已经在musicadapter中创建了媒体播放器。

这是我的代码：

public class activity_fayrouz extends AppCompatActivity {

    private MediaPlayer mMediaPlayer;

    private AudioManager mAudioManager;

    private Button  stopper;

    MediaPlayer mp ;

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

        stopper = (Button) findViewById(R.id.st) ;

        stopper.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


            }
        });

    //        mAudioManager = (AudioManager) 
    getSystemService(Context.AUDIO_SERVICE);

        final ArrayList<music> musics = new ArrayList<>();
        musics.add(new music("shady", "fayrouz", R.raw.shady));
        musics.add(new music("ana L habiby", "fayrouz", R.raw.ana_l_habiby));
        musics.add(new music("alamony", "fayrouz", R.raw.alamony));
        musics.add(new music("habitaak bl saief", "fayrouz", R.raw.habitak_bl_saif));
        musics.add(new music("nsam 3alina el hawa", "fayrouz", R.raw.nsam_aalina_el_hawa));
        musics.add(new music("e7na w el qamar jeraan", "fayrouz", R.raw.e7na_w_el_qamar_jeran));
        musics.add(new music("shady", "fayrouz", R.raw.shady));

        musics.add(new music("shady", "fayrouz", R.raw.shady));
        musics.add(new music("ana L habiby", "fayrouz", R.raw.ana_l_habiby));
        musics.add(new music("alamony", "fayrouz", R.raw.alamony));
        musics.add(new music("habitaak bl saief", "fayrouz", R.raw.habitak_bl_saif));
        musics.add(new music("nsam 3alina el hawa", "fayrouz", R.raw.nsam_aalina_el_hawa));
        musics.add(new music("e7na w el qamar jeraan", "fayrouz", R.raw.e7na_w_el_qamar_jeran));

        musicAdapter adapter = new musicAdapter(this, musics);
        final ListView listView = (ListView) findViewById(R.id.list);
        listView.setAdapter(adapter);

我想要这个停止按钮来停止在音乐适配器中创建的媒体播放器

音乐适配器：

  if(listItemView == null) {
        listItemView = LayoutInflater.from(getContext()).inflate(
                R.layout.list_item, parent, false);
    }


    final music my_music = (music) getItem(position);
    TextView songTitle = (TextView) listItemView.findViewById(R.id.song);
    songTitle.setText(my_music.getSong());
    TextView artistTitle = (TextView) listItemView.findViewById(R.id.artist);
    artistTitle.setText(my_music.getArtist());



   mAudioManager = (AudioManager) getContext().getSystemService(Context.AUDIO_SERVICE);

    Button play = (Button) listItemView.findViewById(R.id.play);
    Button    pause = (Button) listItemView.findViewById(R.id.pause) ;
    Button   stop = (Button) listItemView.findViewById(R.id.stop) ;

play.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {


  mp.start();
}

Answer 1

在音乐适配器类中创建一个停止媒体播放器的公共方法，并在停止按钮上调用该方法onClick;

public void stopMediaPlayer() {
    if (mediaPlayer != null) {
        if (mediaPlayer.isPlaying()) {
            mediaPlayer.stop();
        }
        mediaPlayer.release();
        mediaPlayer = null;
    }
}

    stopper.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            adapter.stopMediaPlayer();
        }
    });