改变轨道媒体播放器android

时间：2012-08-31 11:47:06

标签： android android-mediaplayer mediaplayback

我目前正在使用MediaPlayer播放一首可以播放的歌曲。在用户选择不同的歌曲时，我正试图将其播出。 但是，我得到MediaPlayer的错误（1，-2147483648）和错误（1，-2147483648）。 调用prepareASync（）后会打印这些日志; 注意：文件的路径看起来正确。但是，如何检查有效的文件路径？

顺序如下： 

           mPlayer.reset();
           Log.d(TAG,"after reset");
           mPlayer.setDataSource(mTrackToBePlayed);
           Log.d(TAG,"after setDataSource");
          // mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
           mPlayer.setOnPreparedListener(preparedListener);
           Log.d(TAG,"after setOnPreparedListener");
           mPlayer.setOnErrorListener(errorListener);
           Log.d(TAG,"after setting errorListener");
           mPlayer.prepareAsync();
           Log.d(TAG,"after prepareAsync");

mPlayer.reset(); Log.d(TAG,"after reset"); mPlayer.setDataSource(mTrackToBePlayed); Log.d(TAG,"after setDataSource"); // mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); mPlayer.setOnPreparedListener(preparedListener); Log.d(TAG,"after setOnPreparedListener"); mPlayer.setOnErrorListener(errorListener); Log.d(TAG,"after setting errorListener"); mPlayer.prepareAsync(); Log.d(TAG,"after prepareAsync");

引用的代码是这样的：在我的主要活动的onResume（）中（在返回时，我想开始播放）我正在调用MusicUtils.createPlayer（）;和                 MusicUtils.playTrack（mCurrentTrack）; 

public static void playTrack(String track) {

    mTrackToBePlayed = track;   

    try {
           mPlayer.reset();
           Log.d(TAG,"after reset");
           mPlayer.setDataSource(mTrackToBePlayed);
           Log.d(TAG,"after setDataSource");
          // mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
           mPlayer.setOnPreparedListener(preparedListener);
           Log.d(TAG,"after setOnPreparedListener");
           mPlayer.setOnErrorListener(errorListener);
           Log.d(TAG,"after setting errorListener");
           mPlayer.prepareAsync();
           Log.d(TAG,"after prepareAsync");

    } catch (IOException e) {

    } catch(IllegalArgumentException e) {

    }

    preparedListener = new MediaPlayer.OnPreparedListener() {

        @Override
        public void onPrepared(MediaPlayer mp) {
            // TODO Auto-generated method stub
            mp.start();
            Log.d(TAG,"after start");
        }
    };

     errorListener = new MediaPlayer.OnErrorListener() {
         public boolean onError(MediaPlayer mp, int what, int extra) {
             switch (what) {
             case MediaPlayer.MEDIA_ERROR_SERVER_DIED:
                 Log.d(TAG,"in onError");
                // mIsInitialized = false;
                 mp.release();
                 // Creating a new MediaPlayer and settings its wakemode does not
                 // require the media service, so it's OK to do this now, while the
                 // service is still being restarted
                try{
                 mp = new MediaPlayer(); 
                 mp.reset();
                 mp.setDataSource(mTrackToBePlayed);
                // mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
                 mp.prepareAsync();
                 mPlayer = mp;
                // mPlayer.start();
                } catch (Exception e) {

                }
                 //MediaPlayer.create(mContext, mTrackToBePlayed);
                // mPlayer.setWakeMode(MediaPlaybackService.this, PowerManager.PARTIAL_WAKE_LOCK);                 
                 return true;
             default:
                 Log.d("MusicPlayer", "Error: " + what + "," + extra);
                 break;
             }
             return false;
        }
     };


    //mPlayer.start();

}

public static boolean isPlaying() {
    return mPlayer.isPlaying();
}

public static void pauseTrack() {
    mPlayer.pause();
}

public static void startTrack() {
    mPlayer.start();
}

public static void stopTrack() {
    mPlayer.stop();
}

public static void releasePlayer() {
    mPlayer.release();
}

public static void playTrack(String track) { mTrackToBePlayed = track; try { mPlayer.reset(); Log.d(TAG,"after reset"); mPlayer.setDataSource(mTrackToBePlayed); Log.d(TAG,"after setDataSource"); // mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); mPlayer.setOnPreparedListener(preparedListener); Log.d(TAG,"after setOnPreparedListener"); mPlayer.setOnErrorListener(errorListener); Log.d(TAG,"after setting errorListener"); mPlayer.prepareAsync(); Log.d(TAG,"after prepareAsync"); } catch (IOException e) { } catch(IllegalArgumentException e) { } preparedListener = new MediaPlayer.OnPreparedListener() { @Override public void onPrepared(MediaPlayer mp) { // TODO Auto-generated method stub mp.start(); Log.d(TAG,"after start"); } }; errorListener = new MediaPlayer.OnErrorListener() { public boolean onError(MediaPlayer mp, int what, int extra) { switch (what) { case MediaPlayer.MEDIA_ERROR_SERVER_DIED: Log.d(TAG,"in onError"); // mIsInitialized = false; mp.release(); // Creating a new MediaPlayer and settings its wakemode does not // require the media service, so it's OK to do this now, while the // service is still being restarted try{ mp = new MediaPlayer(); mp.reset(); mp.setDataSource(mTrackToBePlayed); // mp.setAudioStreamType(AudioManager.STREAM_MUSIC); mp.prepareAsync(); mPlayer = mp; // mPlayer.start(); } catch (Exception e) { } //MediaPlayer.create(mContext, mTrackToBePlayed); // mPlayer.setWakeMode(MediaPlaybackService.this, PowerManager.PARTIAL_WAKE_LOCK); return true; default: Log.d("MusicPlayer", "Error: " + what + "," + extra); break; } return false; } }; //mPlayer.start(); } public static boolean isPlaying() { return mPlayer.isPlaying(); } public static void pauseTrack() { mPlayer.pause(); } public static void startTrack() { mPlayer.start(); } public static void stopTrack() { mPlayer.stop(); } public static void releasePlayer() { mPlayer.release(); }

This function is present in MusicUtils and is used to obtain the first track that the cursor returns

public static void retrieveDefaultPath() {

    String[] STAR = { "*" };           
    Uri allsongsuri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;    
    String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";     
    mCursor = mContentResolver.query(allsongsuri, STAR, selection, null, null);     
    if (mCursor != null) {        
        if (mCursor.moveToFirst()) {          
            //do {               
                //mSongName = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));   
                //mSongList.add(mSongName);//populate the list of display names
                int song_id = mCursor.getInt(mCursor.getColumnIndex(MediaStore.Audio.Media._ID));   
                //mMusicIDs.put(song_id, counter++);//fill the HashMap with IDs corresponding to the positions
                String fullpath = mCursor.getString(mCursor.getColumnIndex(MediaStore.Audio.Media.DATA));            
                String album_name = mCursor.getString(mCursor.getColumnIndex(MediaStore.Audio.Media.ALBUM));          
                int album_id = mCursor.getInt(mCursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));               
                String artist_name = mCursor.getString(mCursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));         
                int artist_id = mCursor.getInt(mCursor.getColumnIndex(MediaStore.Audio.Media.ARTIST_ID));        
                //} while (cursor.moveToNext());       


                 mDefaultPath = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI + "/" + song_id;
                 Slideshow.mCurrentTrack = mDefaultPath;

    }      
        if  (mCursor != null) { 
             mCursor.close();   
        }
    } 
}

public static void retrieveDefaultPath() { String[] STAR = { "*" }; Uri allsongsuri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0"; mCursor = mContentResolver.query(allsongsuri, STAR, selection, null, null); if (mCursor != null) { if (mCursor.moveToFirst()) { //do { //mSongName = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME)); //mSongList.add(mSongName);//populate the list of display names int song_id = mCursor.getInt(mCursor.getColumnIndex(MediaStore.Audio.Media._ID)); //mMusicIDs.put(song_id, counter++);//fill the HashMap with IDs corresponding to the positions String fullpath = mCursor.getString(mCursor.getColumnIndex(MediaStore.Audio.Media.DATA)); String album_name = mCursor.getString(mCursor.getColumnIndex(MediaStore.Audio.Media.ALBUM)); int album_id = mCursor.getInt(mCursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID)); String artist_name = mCursor.getString(mCursor.getColumnIndex(MediaStore.Audio.Media.ARTIST)); int artist_id = mCursor.getInt(mCursor.getColumnIndex(MediaStore.Audio.Media.ARTIST_ID)); //} while (cursor.moveToNext()); mDefaultPath = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI + "/" + song_id; Slideshow.mCurrentTrack = mDefaultPath; } if (mCursor != null) { mCursor.close(); } } }

logcat的：

08-31 18：07：36.348：D / dalvikvm（23090）：GC_EXTERNAL_ALLOC释放2K，46％免费3088K / 5703K，外部1461K / 1538K，暂停32ms

08-31 18：07：38.860：D / tag（23090）：在oncreate里面

08-31 18：07：38.860：D / ImageSwitcher（23090）：缓存大小：1

08-31 18：07：39.030：D / ImageSwitcher（23090）：总计数字：838

08-31 18：07：39.150：I / AudioSystem（23090）：获得音频flinger

08-31 18：07：39.150：I / AudioSystem（23090）：返回新的音频会话ID

08-31 18：07：39.150：D / IAudioFlinger（23090）：newAudioSessionId In

08-31 18：07：39.150：D / IAudioFlinger（23090）：newAudioSessionId Out，id = 175

08-31 18：07：39.150：D / MediaPlayer（23090）：reset（）in

08-31 18：07：39.150：D / MediaPlayer（23090）：reset（）out

08-31 18：07：39.150：D / MusicUtils（23090）：重置后

08-31 18：07：39.160：D / MusicUtils（23090）：在setDataSource之后

08-31 18：07：39.160：D / MusicUtils（23090）：在setOnPreparedListener之后

08-31 18：07：39.160：D / MusicUtils（23090）：设置errorListener之后

08-31 18：07：39.170：D / MusicUtils（23090）：在prepareAsync之后

08-31 18：07：39.250：D / MediaPlayer（23090）：start（）in

08-31 18：07：39.260：D / MediaPlayer（23090）：start（）out

08-31 18：07：39.270：D / MediaPlayer（23090）：start（）in

08-31 18：07：39.270：D / MediaPlayer（23090）：start（）out

08-31 18：07：39.270：D / MusicUtils（23090）：开始后

08-31 18：07：49.340：D / MediaPlayer（23090）：暂停（）

08-31 18：07：49.340：D / MediaPlayer（23090）：暂停（） 08-31 18：07：49.560：D / dalvikvm（23090）：GC_CONCURRENT释放239K，45％免费3260K / 5831K，外部494K / 1006K，暂停10ms + 7ms

08-31 18：07：50.842：D /音乐列表（23090）：在getAllSongsFromSDCARD之前的onCreate

08-31 18：07：50.922：D / TAG（23090）：设置适配器

08-31 18：07：50.922：D / TAG（23090）：设置适配器

08-31 18：07：51.953：D / dalvikvm（23090）：GC_EXTERNAL_ALLOC释放146K，45％免费3264K / 5831K，外部794K / 855K，暂停29ms

08-31 18：07：53.905：D / MusicList（23090）：在setItemChecked之后

08-31 18：07：54.585：D / Settings（23090）：onActivityResult内部

08-31 18：07：55.476：W / KeyCharacterMap（23090）：无法打开keycharmap文件

08-31 18：07：55.476：W / KeyCharacterMap（23090）：加载keycharmap时出错

file'/system/usr/keychars/cy8c-touchscreen.kcm.bin'。 hw.keyboards.65538.devname = 'cy8c-触摸屏' 08-31 18：07：55.476：I / KeyCharacterMap（23090）：使用默认值 keymap：/system/usr/keychars/qwerty.kcm.bin

08-31 18：07：55.486：D / MediaPlayer（23090）：reset（）in

08-31 18：07：55.486：D / MediaPlayer（23090）：reset（）out

08-31 18：07：55.486：D / MusicUtils（23090）：重置后

08-31 18：07：55.486：D / MusicUtils（23090）：在setDataSource之后

08-31 18：07：55.486：D / MusicUtils（23090）：在setOnPreparedListener之后

08-31 18：07：55.486：D / MusicUtils（23090）：设置errorListener之后

08-31 18：07：55.486：D / MusicUtils（23090）：在prepareAsync之后

08-31 18：07：55.496：E / MediaPlayer（23090）：错误（1，-2147483648）

08-31 18：07：55.506：E / MediaPlayer（23090）：错误（1，-2147483648）

08-31 18：07：55.506：D / MusicPlayer（23090）：错误：1，-2147483648

2 个答案:

答案 0 :(得分：0)

**Check with the following class it will list out all th songs in the device also it play the song when click on that name.**



public class NewMp3PlayerActivity extends Activity {
       ListView musiclist;

      int music_column_index,music_column_index1;
      int count;
      MediaPlayer mMediaPlayer;
      ImageView play, pause, forward, backward;
      int pposition;
      ArrayList<String> songs = new ArrayList<String>();      String songName;    Cursor musiccursor;
      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.songpreview);

            play = (ImageView)findViewById(R.id.img_play);
            pause = (ImageView)findViewById(R.id.img_pause);
            forward = (ImageView)findViewById(R.id.img_forward);
            backward = (ImageView)findViewById(R.id.img_backward);

            play.setOnClickListener(OnClick);
            pause.setOnClickListener(OnClick);
            forward.setOnClickListener(OnClick);
            backward.setOnClickListener(OnClick);
            init_phone_music_grid();


      }

      View.OnClickListener OnClick = new View.OnClickListener() {
                @Override       public void onClick(View v) {           music_column_index = musiccursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);        

            Log.e("", "musiccursor.getCount()-->"musiccursor.getCount());           switch(v.getId()){          case R.id.img_play:
                Log.v("", "list of songs-->"+songs);
                  if (mMediaPlayer.isPlaying()) {
                      mMediaPlayer.reset();
                }
                  mMediaPlayer.start();
                break;          case R.id.img_pause:
                  if (mMediaPlayer.isPlaying()) {
                      mMediaPlayer.pause();
                }
                break;          case R.id.img_forward: //                musiccursor.moveToPosition(pposition+1);

                try {
                     String filename="";
                        if (pposition < songs.size()){
                            pposition = pposition+1;
                            filename = songs.get(pposition);//musiccursor.getString(music_column_index);
                        }else{

                        }

                        Log.e("", "filename-->"+filename);
                    mMediaPlayer.reset();
                    mMediaPlayer.setDataSource(filename);
                    mMediaPlayer.prepare();
                    mMediaPlayer.start();
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (IllegalStateException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } catch(IndexOutOfBoundsException ie){
                    pposition = 0;
                }

                break;          case R.id.img_backward:

                 try {
                     String filename_n="";
                        if (pposition <= songs.size()){
                            pposition = pposition-1;
                            filename_n = songs.get(pposition);//musiccursor.getString(music_column_index);
                        }else{

                        }
                        mMediaPlayer.reset();
                        mMediaPlayer.setDataSource(filename_n);
                        mMediaPlayer.prepare();
                        mMediaPlayer.start();
                    } catch (IllegalArgumentException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (IllegalStateException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    } catch(ArrayIndexOutOfBoundsException ar){
                        pposition = songs.size();
                    }
                break;          default:
                break;          }
                    }   };
      private void init_phone_music_grid() {
            System.gc(); 
            String[] proj = { MediaStore.Audio.Media._ID,MediaStore.Audio.Media.DATA,MediaStore.Audio.Media.DISPLAY_NAME,MediaStore.Video.Media.SIZE };
            musiccursor = managedQuery(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, proj, null, null, null);
            Log.e("", "filename-->"musiccursor.getCount());
            count = musiccursor.getCount();
            musiclist = (ListView) findViewById(R.id.lst_music);
            musiclist.setAdapter(new MusicAdapter(getApplicationContext()));

            musiclist.setOnItemClickListener(musicgridlistener);
            mMediaPlayer = new MediaPlayer();
            mMediaPlayer.setOnCompletionListener(new OnCompletionListener() {

                @Override
                public void onCompletion(MediaPlayer mp) {
                    try {
                         String filename="";
                            if (pposition < songs.size()){
                                pposition = pposition+1;
                                filename = songs.get(pposition);//musiccursor.getString(music_column_index);
                            }else{

                            }

                            Log.e("", "filename-->"+filename);
                        mMediaPlayer.reset();
                        mMediaPlayer.setDataSource(filename);
                        mMediaPlayer.prepare();
                        mMediaPlayer.start();
                    } catch (IllegalArgumentException e) {
                        e.printStackTrace();
                    } catch (IllegalStateException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    } catch(IndexOutOfBoundsException ie){
                        pposition = 0;
                    }
                }           });
      }

      private OnItemClickListener musicgridlistener = new OnItemClickListener() {
            public void onItemClick(AdapterView parent, View v, int position,long id) {
                  System.gc();
                  pposition = position;
                  music_column_index = musiccursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
                  musiccursor.moveToPosition(position);
                  String filename = musiccursor.getString(music_column_index);
                  String filen = songs.get(pposition);
                  Log.e("", "index-->"+music_column_index);
                  try {
                        mMediaPlayer.reset();
                        mMediaPlayer.setDataSource(filen);
                        mMediaPlayer.prepare(); //                        mMediaPlayer.start();
                  } catch (Exception e) {

                  }
            }
      };



      public class MusicAdapter extends BaseAdapter {
            private Context mContext;

            public MusicAdapter(Context c) {
                  mContext = c;
            }

            public int getCount() {
                  return count;
            }

            public Object getItem(int position) {
                  return position;
            }

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

            public View getView(int position, View convertView, ViewGroup parent) {
                  System.gc();
                  TextView tv = new TextView(mContext.getApplicationContext());
                  String id = null;
                  if (convertView == null) {                     
                        music_column_index = musiccursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME);
                        music_column_index1 = musiccursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
                        musiccursor.moveToPosition(position);
                        id = musiccursor.getString(music_column_index);
                        songName = musiccursor.getString(music_column_index);
                        songs.add( musiccursor.getString(music_column_index1) );
                        music_column_index = musiccursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE);
                        musiccursor.moveToPosition(position);
                        id += " Size(KB):" + musiccursor.getString(music_column_index);
                        tv.setText(id);
                  } else
                        tv = (TextView) convertView;
                  return tv;
            }
      } }

答案 1 :(得分：0)

序列正确。路径出错了。正在使用硬编码的字符串而不是Uri。感谢。

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