點擊多個播放按鈕MediaPlayer同時開始播放多個音頻

Question

我有一個列表視圖，它顯示軌道列表。每個列表項有播放和停止圖標播放和停止跟蹤。我遇到的問題是，如果我點擊多個播放按鈕MediaPlayer同時播放多個音頻，然後如果我嘗試停止多個音頻應用程序crashes.how以防止MediaPlayer同時播放多個音頻？我希望如果mediaplayer正在播放一個音軌並且用戶單擊另一個音軌播放按鈕mediaplyer停止播放上一首曲目和播放點擊播放按鈕，用戶的軌跡..

Answer 1

必須創建MediaPlayer對象只有一個實例，在適配器構造函數，像這樣：

public class SoundCloudAdapter extends BaseAdapter{ 

    private MediaPlayer mMediaPlayer; 
    private Context context; 
    private ArrayList<SoundCloud> soundcloudList; 

    public SoundCloudAdapter(Context context, ArrayList<SoundCloud> soundcloudList) 
    { 
     this.context=context; 
     this.soundcloudList = soundcloudList; 
    mMediaPlayer = new MediaPlayer(); 
    } 

    @Override 
    public long getItemId(int position) 
    { 
     return position; 
    } 

    @Override 
    public int getCount() 
    { 
     return soundcloudList.size(); 
    } 

    @Override 
    public Object getItem(int position) 
    { 
     return soundcloudList.get(position); 
    } 

    @Override 
    public View getView(final int position, View convertView, ViewGroup parent) 
    { 
     final ViewHolder holder; 

     if (convertView == null){ 
      holder = new ViewHolder(); 
      convertView = LayoutInflater.from(context).inflate(R.layout.soundcloud_item, null); 
      holder.textview = (TextView) convertView.findViewById(R.id.title); 
      holder.textview2 = (TextView) convertView.findViewById(R.id.id); 
      holder.textview3 = (TextView) convertView.findViewById(R.id.download); 
      // holder.btn = (Button) convertView.findViewById(R.id.button); 
      holder.img1 = (ImageView) convertView.findViewById(R.id.play2); 
      holder.img2 = (ImageView) convertView.findViewById(R.id.pause); 
      convertView.setTag(holder); 
     }else{ 
      holder = (ViewHolder) convertView.getTag(); 
     } 

     holder.textview.setText(soundcloudList.get(position).getTitle()); 
     holder.textview2.setText(soundcloudList.get(position).getId()); 
     holder.textview3.setText("Play Count : "+soundcloudList.get(position).getDownload()); 
     if(soundcloudList.get(position).getPlaying()) 
     { 
      holder.img1.setVisibility(View.GONE); 
      holder.img2.setVisibility(View.VISIBLE); 
     } 
     else 
     { 
      holder.img1.setVisibility(View.VISIBLE); 
      holder.img2.setVisibility(View.GONE); 
     } 
     holder.img1.setOnClickListener(new View.OnClickListener() 
     { 
      @Override 
      public void onClick(final View v) 
      { 
       soundcloudList.get(position).setPlaying(true); 
       try 
       { 
      holder.img1.setVisibility(View.INVISIBLE); 
        holder.img2.setVisibility(View.VISIBLE); 

        if(mMediaPlayer.isPlaying()) 
        { 
         mMediaPlayer.seekTo(0); 
      mMediaPlayer.pause(); 
        } 

        mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); 
        mMediaPlayer.setDataSource("http://api.soundcloud.com/tracks/" + soundcloudList.get(position).getId() + "/stream?client_id=xyz"); 
        mMediaPlayer.prepareAsync(); 
        mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() 
        { 
         @Override 
         public void onPrepared(MediaPlayer mp) 
         { 
          mp.start(); 

         } 
        }); 
        mMediaPlayer.setOnCompletionListener(
          new MediaPlayer.OnCompletionListener() 
          { 
           @Override 
           public void onCompletion(MediaPlayer mp) 
           { 
            soundcloudList.get(position).setPlaying(false); 
            holder.img1.setVisibility(View.VISIBLE); 
            holder.img2.setVisibility(View.INVISIBLE); 

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

      } 

     }); 
     holder.img2.setOnClickListener(new View.OnClickListener() 
     { 

      @Override 
      public void onClick(final View v) 
      { 
       soundcloudList.get(position).setPlaying(false); 


       holder.img1.setVisibility(View.VISIBLE); 
       holder.img2.setVisibility(View.INVISIBLE); 

     mMediaPlayer.seekTo(0); 
     mMediaPlayer.pause(); 


      } 

     }); 

     return convertView; 

    } 

    static class ViewHolder 
    { 
     public TextView textview; 
     public TextView textview2; 
     public TextView textview3; 
     public ImageView img1; 
     public ImageView img2; 
     public Button btn; 
    } 

} 

Answer 2

是我遇到的問題是，如果我點擊多種播放按鈕 MediaPlaye [R在同一時間

它的播放多個音頻，因爲你創建MediaPlayer每次onClick的新實例trigerred：

mMediaPlayer = new MediaPlayer(); 

創建實例一次（在onCreate，例如），只是改變在onClick方法中的url。