Can't set asset as datasource in the mediaplayer

Question

I'm currently building a soundboard app as my first little Android app project. I saved a bunch of .mp3 files in the assets folder of my app and then dynamically created buttons based on the .mp3 files stored in there. In the tag of every button, I saved its corresponding .mp3 file name.

In the onClick() event of every button, I try to set the DataSource of a global MediaPlayer to the file from my assets. The FileDescriptor handles the openFd command flawlessly but the mediaPlayer can't set the DataSource.

The app just crashes, after executing that command. Here is the OnClickListener:

tempButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {                   
        mediaPlayer.release();
        String tag = v.getTag().toString();

        try {
            AssetFileDescriptor afd = getAssets().openFd(tag + ".mp3");
            mediaPlayer.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
            afd.close();

            mediaPlayer.prepare();
            mediaPlayer.start();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
});

The logcat prints the following crash when executing the setDataSource() method:

05-22 16:23:45.191 4505-4505/com.development.alo.dasunterboard E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.development.alo.dasunterboard, PID: 4505
    java.lang.IllegalStateException
        at android.media.MediaPlayer._setDataSource(Native Method)
        at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1133)
        at com.development.alo.dasunterboard.MainActivity$2.onClick(MainActivity.java:79)
        at android.view.View.performClick(View.java:5198)
        at android.view.View$PerformClick.run(View.java:21147)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:5417)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

I took a look into the MediaPlayer.java because the crash seems to happen there. It looks like the FileDescriptor not valid.

`The App just crashes` see the exception stacktrace for the reason why it crashes. — Vladyslav Matviienko, May 21 '17 at 20:35
Possible duplicate of [Unfortunately MyApp has stopped. How can I solve this?](http://stackoverflow.com/questions/23353173/unfortunately-myapp-has-stopped-how-can-i-solve-this) — Vladyslav Matviienko, May 21 '17 at 20:35
It won't even get there.. I set a break point to the e.printStackTrace but before it gets there, the app instantly closes. — André, May 21 '17 at 20:36
`the app instantly closes` and what does logcat say? You catch IOException, but there might other exception happen — Vladyslav Matviienko, May 21 '17 at 20:39
the problem is on the line `MainActivity.java:79`. What is on that line? — Vladyslav Matviienko, May 22 '17 at 16:34
That is the following line in the OnClickListener() method: mediaPlayer.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength()); — André, May 22 '17 at 16:36

score 0 · Accepted Answer · answered May 22 '17 at 16:44

0

you should not release() MediaPlayer before setting DataSource, but should reset() it. Replase mediaPlayer.release(); with mediaPlayer.reset();

answered May 22 '17 at 16:44

Vladyslav Matviienko

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That was it! Thanks a lot mate! When you read the Android API description about those two methods it also totally makes sense :) https://developer.android.com/reference/android/media/MediaPlayer.html – André May 22 '17 at 16:56

Can't set asset as datasource in the mediaplayer

1 Answers1