I'm trying to take a music file from the music folder of the user in a Fragment, but when I do that and after receiving it in onActivityResult (and logging it), I get a Nullpointer Exception when I want to play it with media player. The code to pick the file:
Button pickFile = (Button) v.findViewById(R.id.btnpick);
pickFile.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 1);
}
});
OnActivityResult (Don't forgetting that I'm in a fragment)
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
getActivity();
if ((resultCode == getActivity().RESULT_OK) && (data != null)) {
Log.d("result", "okreceived");
Uri soundUri = Uri.parse(data.getData().toString());
Log.i("result", "Intent data " + data.getData().toString());
mplayergo(soundUri);
}
if (resultCode == getActivity().RESULT_CANCELED)
{
//null
}
}
public void mplayergo(Uri soundUri){
try {
mplayer.setDataSource(getActivity(), soundUri);
mplayer.start();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
Here's the log:
D/result: okreceived I/result: Intent data content://media/external/audio/media/34839 W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaPlayer.setDataSource(android.content.Context, android.net.Uri)' on a null object reference at com.package.example.GameFragment.mplayergo(GameFragment.java:764) at com.package.example.GameFragment.onActivityResult(GameFragment.java:748) W/System.err: at android.support.v4.app.FragmentActivity.onActivityResult(FragmentActivity.java:156) W/System.err: at android.app.Activity.dispatchActivityResult(Activity.java:6290) W/System.err: at android.app.ActivityThread.deliverResults(ActivityThread.java:3606) W/System.err: at android.app.ActivityThread.handleSendResult(ActivityThread.java:3653) W/System.err: at android.app.ActivityThread.access$1400(ActivityThread.java:154) W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1371) W/System.err: at android.os.Handler.dispatchMessage(Handler.java:102) W/System.err:
at android.os.Looper.loop(Looper.java:135) W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5300) W/System.err: at java.lang.reflect.Method.invoke(Native Method) W/System.err: at java.lang.reflect.Method.invoke(Method.java:372) W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
Solved by re-initializing MediaPlayer and setting the URI as a source.
public void mplayergo(Uri soundUri){
try {
mplayer.stop();
mplayer.reset();
mplayer.release();
mplayer = MediaPlayer.create(getActivity(), soundUri);
// mplayer.start();
} catch (Exception e) {
e.printStackTrace();
}
}
