android MediaPlayer not playing mp3 file

Question

I have written the most basic application I can think of to try to play an mp3 file, but it is not working. I don't get any errors, but when the application starts up, the sound is not played.

public class soundtest extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        MediaPlayer mp = new MediaPlayer();
        mp.create(getApplicationContext(), R.raw.norm_iphone_money);
        mp.start();
    }
}

What am I missing? I have "norm_iphone_money.mp3" inside the res/raw folder. The file plays fine in Windows Media Player and iTunes.

I'm using the latest versions of Java SDK and Eclipse for Java. The app is targeted for Android 2.2 and runs fine in the emulator despite no sound.

Have you tried on a real device? You might try using the setDataSource() and prepare() methods before a MediaPlayer start() instead of create(), but I doubt that will work if create() doesn't... — DJC, Feb 12 '11 at 04:29

Xuan Tung Vu · Answer 1 · 2020-02-27T02:57:27.623

44

The problem is that the media volume is set to 0 (not the ringer volume). You can set it by:

AudioManager audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);

Have a look at the developer page and another question for the explanation of parameters for setStreamVolume(int, int, int).

edited Feb 27 '20 at 02:57

answered Aug 11 '12 at 04:19

Xuan Tung Vu

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9
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what is this StartUpActivity – Deepzz May 14 '13 at 11:53
edited the answer! StartupActivity is just an Activity in my project. But we can refer the constant AUDIO_SERVICE by Context class. Activity is just a Context, and AUDIO_SERVICE is a static constant string of Context. Thanks a lot for your feedback, Deppzz! – Xuan Tung Vu May 19 '13 at 06:46
4

And there goes an hour of my life... Thanks !! – Guillaume Sep 25 '15 at 17:26
@XuanTungVu .. Please explain about these values 20 and 0 in (AudioManager.STREAM_MUSIC, 20, 0).. – Ever Think Jul 11 '18 at 18:00
Thanks, added links to the explanation. – Xuan Tung Vu Jul 13 '18 at 00:48
This works but why? I mean, my code has been working for months and suddenly sound went out without error.. may be an android update? – aaron0207 Jul 09 '19 at 17:01

score 10 · Answer 2 · answered Feb 12 '11 at 02:24

10

Try replacing these two lines:

MediaPlayer mp = new MediaPlayer();
mp.create(getApplicationContext(), R.raw.norm_iphone_money);

with this one line:

MediaPlayer mp = MediaPlayer.create(this, R.raw.norm_iphone_money);

And see if that works.

answered Feb 12 '11 at 02:24

ShadowGod

7,891
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7

if these two are writings are any logically different whatsoever in the compiled code, I'd be shocked. – DJC Feb 12 '11 at 04:31
1

No but testing it myself it only works that way, it doesn't work how he originally wrote it. If anyone else cares to explain exactly *why* that is, that would be great. Playing a RAW audio resource is described right here http://developer.android.com/guide/topics/media/index.html – ShadowGod Feb 12 '11 at 06:35
7

Of course it is logically different. mp.create will call the static method, and it will return a new instance of a MediaPlayer, which is never stored. Then, he calls start() on the default-constructed instance. – Yuyo Jul 18 '11 at 06:15

score 1 · Answer 3 · answered Aug 26 '18 at 19:20

1

The problem is with emulator, change the emulator or try to run the application on a real device. This should solve the problem.

answered Aug 26 '18 at 19:20

Anurag Shukla

11
2

score -2 · Answer 4 · answered Feb 12 '11 at 06:04

The static method create(Context, int) from the type MediaPlayer should be accessed in a static way. Try this:

MediaPlayer.create(getApplicationContext(), R.raw.norm_iphone_money).start();

It will play the .mp3 with this line too

mp.create(getApplicationContext(), R.raw.norm_iphone_money).start();

score -4 · Answer 5 · edited May 21 '13 at 06:25

-4

I would suggest this :

MediaPlayer mp = new MediaPlayer();
//bla bla bla
mp = MediaPlayer.create(getApplicationContext(), R.raw.norm_iphone_money);

edited May 21 '13 at 06:25

Jeevan Patil

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answered May 21 '13 at 05:59

Guzhov

5

Why do yo create a media player `mp`, then replace it with the output from `MediaPlayer.create`? – Simon MᶜKenzie May 21 '13 at 06:20

score -4 · Answer 6 · edited Nov 24 '14 at 17:25

-4

Had the same problem after i clicked to start the Media Player, the screen went black and the app stopped.

i just changed

MediaPlayer mp = MediaPLayer.create(this,R.raw.sound); mp.start();

to

MediaPlayer mp = MediaPLayer.create(this,R.raw.sound).start();

I am not really sure what is the difference there, but it solved my problem.

edited Nov 24 '14 at 17:25

Taryn

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answered Mar 27 '14 at 05:11

user3467150

13

There is no difference if you just chain the method call. – Samuel Barbosa May 15 '14 at 01:24

android MediaPlayer not playing mp3 file

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