Android MediaPlayer Problems :"Error (-38 , 0) " and "stop called in state 1"

Question

It's no sound from my device even the emulator.

Actually, at the line "mMediaPlayer.create(this, musicIds[0]); " , eclipse suggests me two choices : "Change access to static using 'MediaPlayer'(declaring type)" or "Add @SuppressWarnings 'static-access' to on Create()". By the way, I take eclipse's suggestions........but still don't work.

P.S. I called a package from other project (pager).

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setTitle(R.string.diff_title);
    setContentView(R.layout.title_layout);    


    viewFlow = (ViewFlow) findViewById(R.id.viewflow);
    DiffAdapter adapter = new DiffAdapter(this);
    viewFlow.setAdapter(adapter);  
    TitleFlowIndicator indicator = (TitleFlowIndicator) findViewById(R.id.viewflowindic);
    indicator.setTitleProvider(adapter);
    viewFlow.setFlowIndicator(indicator);


    //Set all views
    listView = (ListView) findViewById(R.id.listView1);
    listView.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, listeStrings));
    final ImageView imv=(ImageView)findViewById(R.id.imv);
    imv.setImageResource(imageIds[0]);
    final ImageView pic = (ImageView)findViewById(R.id.Picture);
    pic.setImageResource(imageIds[0]);

    btnPlay = (ImageButton)findViewById(R.id.btnplay);
    btnPlay.setOnClickListener(this);

    btnNext = (ImageView)findViewById(R.id.imvnext);
    btnLast = (ImageView)findViewById(R.id.imvlast);        
    final TextView textview = (TextView)findViewById(R.id.textView2);
    textview.setText(listeStrings[0]);  
    seekBar = (SeekBar)findViewById(R.id.seekbar);
    //seekBar.setMax(mMediaPlayer.getDuration());

    mMediaPlayer.create(this, musicIds[0]);

    try {
           if (mMediaPlayer != null) {
               mMediaPlayer.stop();
           }
           mMediaPlayer.prepare();
           mMediaPlayer.start(); 
    } catch (IllegalStateException e) {
           e.printStackTrace();
    } catch (IOException e) {
           e.printStackTrace();
    }

    listView.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            int songIndex = position;
            String songTitle=musicNames[position];
            imv.setImageResource(imageIds[position]);
            pic.setImageResource(imageIds[position]);
            textview.setText(listeStrings[position]);

        }
    });


}


}

And this is my logcat:

08-11 07:33:19.217: E/MediaPlayer(338): stop called in state 1
08-11 07:33:19.217: E/MediaPlayer(338): error (-38, 0)
08-11 07:33:19.217: E/MediaPlayer(338): prepareAsync called in state 0
08-11 07:33:19.217: W/System.err(338): java.lang.IllegalStateException
08-11 07:33:19.227: W/System.err(338):  at android.media.MediaPlayer.prepare(Native Method)
08-11 07:33:19.227: W/System.err(338):  at org.taptwo.android.widget.viewflow.example.DiffViewFlowExample.onCreate(DiffViewFlowExample.java:95)
08-11 07:33:19.227: W/System.err(338):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-11 07:33:19.227: W/System.err(338):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
08-11 07:33:19.227: W/System.err(338):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
08-11 07:33:19.227: W/System.err(338):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
08-11 07:33:19.227: W/System.err(338):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
08-11 07:33:19.227: W/System.err(338):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-11 07:33:19.227: W/System.err(338):  at android.os.Looper.loop(Looper.java:123)
08-11 07:33:19.227: W/System.err(338):  at android.app.ActivityThread.main(ActivityThread.java:3683)
08-11 07:33:19.227: W/System.err(338):  at java.lang.reflect.Method.invokeNative(Native Method)
08-11 07:33:19.227: W/System.err(338):  at java.lang.reflect.Method.invoke(Method.java:507)
08-11 07:33:19.227: W/System.err(338):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-11 07:33:19.227: W/System.err(338):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-11 07:33:19.227: W/System.err(338):  at dalvik.system.NativeStart.main(Native Method)<br>
08-11 07:33:19.257: E/MediaPlayer(338): Error (-38,0)

Solution

Before prepare(), you need first to call setDataSource(..).

The Media framework is a very strict state machine, and it's really cumbersome to handle all the different states.

I've used this little wrapper that makes the coding/debugging a bit easier. You can give it a try.

Regarding emulator - note that not all file formats are supported on it.