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)
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.
来源：https://stackoverflow.com/questions/11913108/android-mediaplayer-problems-error-38-0-and-stop-called-in-state-1