for循环使用原始音乐数组android

Question

我目前正在尝试创建一个 for 循环，它将在其中播放原始文件，完成后，它将继续播放数组中的下一个声音文件。它当前正在一次播放所有文件。关于我如何解决这个问题的任何建议？我认为完成监听器可能存在问题，但不确定。谢谢。

我的代码：

package com.example.mediatest;



    int[] myMusic = {R.raw.caralarm, R.raw.phonebusysignal, R.raw.phoneoffhook};



    MediaPlayer mp = new MediaPlayer();



   for (int y =0; y<3; y++){
       mp = MediaPlayer.create(this, myMusic[y]);
       mp.start();
       mp.setOnCompletionListener(new OnCompletionListener(){

        @Override
        public void onCompletion(MediaPlayer mp) {
            // TODO Auto-generated method stub

        }

       });
   }

Answer 1

您可以创建单独的 MediaPlayer 对象，首先启动，然后在 onCompletion 中启动下一个。对于可扩展的解决方案，请尝试以下方法：

int[] myMusic = {R.raw.caralarm, R.raw.phonebusysignal, R.raw.phoneoffhook};
int mCompleted = 0;

MediaPlayer mp = MediaPlayer.create(this, myMusic[0]);

mp.setOnCompletionListener(new OnCompletionListener() {
    @Override
    public void onCompletion(MediaPlayer mp) {
        mCompleted++;
        mp.reset();
        if (mCompleted < myMusic.length()) {
            try {
                AssetFileDescriptor afd = getResources().openRawResourceFd(myMusic[mCompleted]);
                if (afd != null) {
                    mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
                    afd.close();
                    mp.prepare();
                }
            } catch (Exception ex) {
                // report a crash
            }
        } else {
            // done with media player
            mp.release();
            mp = null;
        }
    }
});

mp.start();

一种更简单的方法（稍微浪费资源）是：

int[] myMusic = {R.raw.caralarm, R.raw.phonebusysignal, R.raw.phoneoffhook};
int mNext;
OnCompletionListener mListener = new OnCompletionListener() {
    @Override
    public void onCompletion(MediaPlayer mp) {
        mp.release();
        startNextFile();
    }
};

@Override
public void onCreate() {
    // usual onCreate stuff here, then...

    // either here or whenever you want to start the sequence
    mNext = 0;
    startNextFile();
}

void startNextFile() {
    if (mNext < myMusic.length) {
        MediaPlayer mp = MediaPlayer.create(this, myMusic[mNext++]);
        mp.setOnCompletionListener(mListener);
        mp.start();
    }
}

Answer 2

这是在继续循环中播放歌曲的工作代码。

public class MainActivity extends Activity 
{
private int[] tracks = {R.raw.explosion,R.raw.pianothingy_one,R.raw.car_horn_x};
int mCompleted = 0;

public void onCreate(Bundle savedInstanceState) 
{
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 MediaPlayer mp = MediaPlayer.create(this, tracks[0]);
 mp.setOnCompletionListener(new OnCompletionListener() 
 {
     @Override
     public void onCompletion(MediaPlayer mp)
     {
         mCompleted++;
         mp.reset();
         if (mCompleted < tracks.length) 
         {
             try
             {
                 AssetFileDescriptor afd = getResources().openRawResourceFd(tracks[mCompleted]);
                 if (afd != null) 
                 {
                     mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
                     afd.close();
                     mp.prepare();
                     mp.start();
                 }
             }
             catch (Exception ex) 
             {
                ex.printStackTrace();
             }

         } 
         else if (mCompleted>=tracks.length) 
         {
             mCompleted =0;
             try
             {
                 AssetFileDescriptor afd = getResources().openRawResourceFd(tracks[mCompleted]);
                 if (afd != null) 
                 {
                     mp.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
                     afd.close();
                     mp.prepare();
                     mp.start();
                 }
             }
             catch (Exception ex) 
             {
                ex.printStackTrace();
             }
         }
         else
         {
             mCompleted=0;
              mp.release();
              mp = null;
         }

     }
 });

 mp.start();

Answer 3

创建一个 MediaPlayers 数组会更容易，因为您只有 3 个。您应该只启动第一个并设置 onCompletionListeners，您将在其中启动下一个播放器。希望这会有所帮助。

Answer 4

 int flag=0;
 int track; 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_player);
    NextSongOnline()
    //here in my code i keept all sogns in araayList<> and by using mySongs i am parsing the arraylist that intented from another activity. 
    //mySongs = (ArrayList) bundle.getParcelableArrayList("songs");
}


public void NextSongOnLine(){
    if (flag == 0){
        track = position;
    }
    flag = 1;
    if (track == position){
        position = ((position + 1)%mySongs.size());
        Uri uri3 = Uri.parse(mySongs.get(position).toString());
        myMediaPlayer = MediaPlayer.create(getApplicationContext(),uri3);

        sname = mySongs.get(position).getName().toString();
        songTitle.setText(sname);

        myMediaPlayer.start();
        seekBar.setMax(myMediaPlayer.getDuration()/1000);

        //set End time of music
        endTimeText.setText(createTimerLabel(myMediaPlayer.getDuration()/1000));

    }
    track++;
    myMediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        // after one song completion this override method will be called with next position of song which is holding the counter "track". and that's how the loop will be continuing. 
        @Override
        public void onCompletion(MediaPlayer mp) {
            NextSongOnLine();
            Toast.makeText(getApplicationContext(),"Auto Playing Next Song",Toast.LENGTH_SHORT).show();
        }
    });
}

}