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    <pre><code>**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&lt;String&gt; songs = new ArrayList&lt;String&gt;(); 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()--&gt;"musiccursor.getCount()); switch(v.getId()){ case R.id.img_play: Log.v("", "list of songs--&gt;"+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 &lt; songs.size()){ pposition = pposition+1; filename = songs.get(pposition);//musiccursor.getString(music_column_index); }else{ } Log.e("", "filename--&gt;"+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 &lt;= 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--&gt;"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 &lt; songs.size()){ pposition = pposition+1; filename = songs.get(pposition);//musiccursor.getString(music_column_index); }else{ } Log.e("", "filename--&gt;"+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--&gt;"+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; } } } </code></pre>
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    1. POchanging a track media player android
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      1. PTQuestion
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    1. USSatheesh
    1. USSatheesh
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    1. COI tried, it doesn't. Like I said earlier, the default track doesn't play if I do it in the above way. My original implementation plays out the default track. I have seen many code samples. I can't find anything that I'm missing. What is that error(1,-2148..)?
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      1. USNamratha
    2. COOkay. Where is your file located ? on sdcard or else on the application path? And which way you got the fil path for example statically as"sdcard/media/new.mp3" or else using Environment.getExtrnalStorage
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      1. PO
      1. USSatheesh
    3. COPlease check the edits above to see how I obtain the filepath. The files are on the sd card. I also tried to play out the same file(firdt track) after mPlayer.pause(). So, I called playTrack(currentTrack). But, this gave me the same error and nothing played. This implies that the path is not the issue right? Since even the same file couldn't be played out after being paused. However, if I do mPlayer.start() after pause() it works but I am not able to change tracks.
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      1. USNamratha
 

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