null object reference - Music Player

Question

I am working on a music player, but I keep on getting this error whenever I try to play a song

LogCat:

Attempt to invoke virtual method 'void android.media.MediaPlayer.start()' on a null object reference
        at com.musicapp.android.musicapp.PlayingScreen.playSongs(PlayingScreen.java:119)

Code:

public void playSongs() {
    if(PlayingScreen_List != null){
        uri = Uri.parse(PlayingScreen_List.get(position).getPath());
    }

    if (mediaPlayer != null) {
        mediaPlayer.stop();
        mediaPlayer.release();
        mediaPlayer = MediaPlayer.create(getApplicationContext(), uri);
    } else {
        mediaPlayer = MediaPlayer.create(getApplicationContext(), uri);
    }
    Toast.makeText(getApplicationContext(),String.valueOf(uri),Toast.LENGTH_SHORT).show();
119    mediaPlayer.start();
}

AND no, my uri is not null.....I did a TOAST and it showed me the path for every song I clicked on.....WELPP? :)

"PlayingScreen_List" is not null I did a toast...it looks like this [1]: https://i.stack.imgur.com/iU1jf.jpg

It says `mediaPlayer` is null. So it looks like `MediaPlayer.create` is returning null. — khelwood, Jul 09 '20 at 15:19
Hello! I just did a toast of the "PlayingScreen_List" array, and it's not empty at all. — Elsa__fewfwef, Jul 09 '20 at 16:06
I posted a screenshot.....it's at the bottom, can you take a look at it. — Elsa__fewfwef, Jul 09 '20 at 16:30

score 0 · Answer 1 · answered Jul 09 '20 at 15:27

0

https://developer.android.com/reference/android/media/MediaPlayer#create(android.content.Context,%20android.net.Uri)

Returns MediaPlayer a MediaPlayer object, or null if creation failed

answered Jul 09 '20 at 15:27

Itzic Kidana

11
3

score 0 · Answer 2 · answered Jul 09 '20 at 15:56

0

Maybe check your PlayingScreen_List?

If

if(PlayingScreen_List != null){
    uri = Uri.parse(PlayingScreen_List.get(position).getPath());
}

is giving you null or not being called that could be causing an error when you use

mediaPlayer = MediaPlayer.create(getApplicationContext(), uri);

answered Jul 09 '20 at 15:56

Joshua Peddle

31
1

Hello! I just did a toast of the "PlayingScreen_List" array, and it's not empty at all. – Elsa__fewfwef Jul 09 '20 at 16:06
yes, the media player is null but "PlayingScreen_List" isn't. How do I fix that? – Elsa__fewfwef Jul 09 '20 at 16:37
Hmm at this point I would check that the media you're trying to play is all good. – Joshua Peddle Jul 10 '20 at 17:11
It seems that mediaPlayer = MediaPlayer.create(getApplicationContext(), uri); is returning null which could mean the media is no good and the creation of the object failed. – Joshua Peddle Jul 10 '20 at 17:13

null object reference - Music Player

2 Answers2