Question

我在菜单上创建了一个播放mp3的项目。但它无法停止。当我点击＆＃34;停止＆＃34;我怎么能停止媒体播放器？按钮。我希望点击停止按钮必须停止所有在菜单上播放mp3。感谢...

公共类DetailActivity扩展了AppCompatActivity {

Toolbar mToolbar;
ImageView mFlower;
TextView mDescription,mBaslik;
Button fab;
MediaPlayer mediaPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_detail);
    mToolbar = findViewById(R.id.toolbar);
    mToolbar.setTitle(getResources().getString(R.string.app_name));
    setSupportActionBar(mToolbar);
    getSupportActionBar().setTitle("MP3  --->");
   }

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);

    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();

    if (id == R.id.action_settings) {

        MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.fon2);
        mediaPlayer.start();
    }
    if (id == R.id.stop) {
        mediaPlayer.stop();

        mediaPlayer.release();
       // mediaPlayer.onDestroy();
    }
    if (id == R.id.fav) {
        MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.fon2);
        mediaPlayer.start();
    }
    if (id == R.id.yor) {
        MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.fon3);
        mediaPlayer.start();
    }
    if (id == R.id.asd) {
        MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.fon1);
        mediaPlayer.start();
    }

    return super.onOptionsItemSelected(item);
}

}

Answer 1

您必须在此方法之外声明MediaPlayer对象

MediaPlayer mediaplayer;

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();

        if (id == R.id.foni) {

        //MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.fon2);
        mediaPlayer = MediaPlayer.create(this, R.raw.fon2);
        mediaPlayer.start();
    }
    if (id == R.id.stop) {

        //MediaPlayer mediaPlayer = new MediaPlayer();
        mediaPlayer.stop();
    }
    if (id == R.id.fonb) {
        MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.fon1);
        mediaPlayer.start();
    }
    if (id == R.id.fonu) {
        MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.fon3);
        mediaPlayer.start();
    }
        return super.onOptionsItemSelected(item);
}

Answer 2

MediaPlayer mp;
AssetFileDescriptor descriptor;



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


        if(mp != null){
            if(mp.isPlaying()){
                mp.stop();
            }
        }

        try {
            descriptor = getAssets().openFd("////the name of your song.mp3////");            // song should be in assets folder
        } catch (IOException e) {
            e.printStackTrace();
        }


        audioPlayer();
    }



public void audioPlayer() {
        //set up MediaPlayer

        mp = new MediaPlayer();


        try {

            mp.setDataSource(descriptor.getFileDescriptor(), descriptor.getStartOffset(), descriptor.getLength());

            descriptor.close();

            mp.prepare();


        } catch (Exception e) {
            e.printStackTrace();
        }
    }



public void OnPlayPressed(View view){


        if(mp.isPlaying()){

            mp.pause();   

        }else{


            mp.start();           

        }


    }




    public void OnStopPressed(View view){



        mp.stop();

        try {
            descriptor = getAssets().openFd("////the name of your song.mp3////");         // song should be in assets folder
        } catch (IOException e) {
            e.printStackTrace();
        }

        audioPlayer();

    }

创建2个按钮，1个用于开始/暂停，1个用于停止。 “OnPlayPressed”是第一个按钮的监听器，“OnStopPressed”是第二个按钮的监听器。

只要你掌握了它背后的逻辑，就随意乱用这段代码。

编辑：在onStopPressed中我重新初始化描述符，以便您可以再次按“播放”按钮再次播放您的歌曲。但这不是必需的。你可以写“mp.stop（）;”。

如何在菜单上停止MP3播放器

2 个答案: