Android Media Player: Start called in state 4 error(-38,0)

android, android-assets, android-asynctask, media-player

Solution

You can also use below `onPrepared()` method to call start method so that `start()` is called after `MediaPlayer` is prepared.

mp.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            // TODO Auto-generated method stub

            mp.start();

        }
    });

Problem

This is the code am using to fetch a file name(.mp3) dynamically from some other class as am having many mp3 files in my assets folder: ``` playAudioButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { FileName audio=new FileName(); String audioName=audio.getAudioName(count).toString(); if(audioName=="NO Audio") { Toast.makeText(getApplicationContext(), "No Audio for this page", Toast.LENGTH_SHORT).show(); } else { try { afd=getAssets().openFd(audioName + ".mp3"); mp = new MediaPlayer(); mp.setDataSource(afd.getFileDescriptor(),afd.getStartOffset(),afd.getLength()); mp.prepareAsync(); mp.start(); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalStateException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }); } ``` Log Cat : ``` 03-20 11:21:28.726: E/SpannableStringBuilder(4418): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length 03-20 11:21:28.726: E/SpannableStringBuilder(4418): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length 03-20 11:22:24.968: D/libEGL(4579): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so 03-20 11:22:24.976: D/libEGL(4579): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so 03-20 11:22:24.984: D/libEGL(4579): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so 03-20 11:22:25.070: D/OpenGLRenderer(4579): Enabling debug mode 0 03-20 11:22:38.773: E/MediaPlayer(4579): start called in state 4 03-20 11:22:38.773: E/MediaPlayer(4579): error (-38, 0) 03-20 11:22:38.773: E/MediaPlayer(4579): Error (-38,0) ``` Points to be noted: 1. I have checked similar threads on stack overflow the answer is using prepareAsync() 2. I have used prepareAsync() Thanks in advance.

Original source