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[VIDEO-Tut] - Playing Media(mp3) on the emulator

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plusminus
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Joined: 14 Nov 2007
Posts: 2067
Location: Germany
PostPosted: Mon Dec 03, 2007 8:46 am    Post subject: Reply with quote
Hey zaac,

perhaps you forgot to change the main.xml or didn't add the -useaudio in the Eclipse Run Button(Run)-configurations.
If you use the debugger to locate the line, the NullPointerException gets thrown, would make it easier to help.

Regards,
plusminus
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zaac
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Joined: 03 Dec 2007
Posts: 4
Location: France
PostPosted: Mon Dec 03, 2007 10:10 am    Post subject: Reply with quote
My main.xml is ok and i have make -useaudio

Now i can't launch, i have this on the console:

Code:
[2007-12-03 10:08:04 - musicplayer] ------------------------------
[2007-12-03 10:08:04 - musicplayer] Android Launch!
[2007-12-03 10:08:04 - musicplayer] Launching: org.anddev.android.musicplayer.musicplayer
[2007-12-03 10:08:04 - musicplayer] WARNING: Unknown device build id
[2007-12-03 10:08:04 - musicplayer] Pushing musicplayer.apk to /data/app on the device
[2007-12-03 10:08:21 - musicplayer] Failed to install musicplayer.apk on device #1: Unknown Error
[2007-12-03 10:08:21 - musicplayer] Unknown Error
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plusminus
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Joined: 14 Nov 2007
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Location: Germany
PostPosted: Mon Dec 03, 2007 3:31 pm    Post subject: Reply with quote
Hey zaac,

that Error is really strange Exclamation
Quote:
WARNING: Unknown device build id

Seems like you Emulator-Image is corrupt...
You could try the following (reset the emulator-rom): (click)

If that dosn't help: Final 'solution' redownload the whole SDK Sad


Regards,
plusminus
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zaac
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Joined: 03 Dec 2007
Posts: 4
Location: France
PostPosted: Mon Dec 03, 2007 4:02 pm    Post subject: Reply with quote
It work now but it begin to play only if i click on the volume:



Could you do an archive zip witch the full project ?
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plusminus
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Joined: 14 Nov 2007
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PostPosted: Mon Dec 03, 2007 9:10 pm    Post subject: Reply with quote
Hello zaac,

please tell us how did you handle the Error you had before, so everybody can learn from it Exclamation

When you hit the Sound-Buttons, you will always hear a sound coming out Exclamation (if you started with -useaudio)

Just because it is you Smile :The full source (without the song Exclamation)

Regards,
plusminus
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lancelot
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Joined: 04 Dec 2007
Posts: 1
PostPosted: Tue Dec 04, 2007 1:44 pm    Post subject: Reply with quote
Hello everyone..

I was trying to make this aplication work but I´m still gettind this message..



I have no idea what I´m doing wrong, can someone tell me what it could be???.

The program starts ok, but if i press the button I get that message..

Thanks..
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Katharnavas
Senior Developer


Joined: 04 Dec 2007
Posts: 100
Location: India
PostPosted: Tue Dec 04, 2007 2:02 pm    Post subject: Reply with quote
zaac wrote:
Yes it is the solution but now i have an other bug when i click on the button play:



Hi,
What i hope was mp is not getting initialized. Because for me also the audio is not getting played but no error.
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plusminus
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Joined: 14 Nov 2007
Posts: 2067
Location: Germany
PostPosted: Tue Dec 04, 2007 3:49 pm    Post subject: Reply with quote
Hey guys,

somehow your MediaPlayer doesn't want to get initialized.
What you can try is the following:
Java:
MediaPlayer mp = new MediaPlayer();
try {
    mp.setDataSource( "/path/to/your/mp3/everlast.mp3" );
} catch ( IOException e ) {
    Log.e( "ioexception", "",  e);
}
mp.prepare();
mp.start();

You will need to push the mp3-file to the folder you specified in your code using adb push. (read more)
plusminus wrote:
Console PUSHing files:
Idea Emulator has to be open && Browse in Terminal/CommandLine to ".../android_sdk/tools"

Syntax: " adb push <local_source> <emulator_destination> "


MediaPlayer now at least should not become null Exclamation
If it still doesn't want to play the file, that could happen because for Securtiy-Reasons... (file not 'Associated' with your application)
Arrow Then try a file that was originally shipped with the emulator, like: "/system/media/audio/ringtones/em_ringtone1.mp3"

Hope this could solve it Neutral

Regards,
plusminus
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dave007
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Joined: 30 Nov 2007
Posts: 4
PostPosted: Wed Dec 05, 2007 2:28 am    Post subject: me again Reply with quote
Hello everybody!
I really thank you plusminus for your help. now i can listen music with the player. I really don't understand why it doesn't worked but in this way, i have no any errors. thank you!
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NumBeast
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Joined: 09 Dec 2007
Posts: 6
PostPosted: Sun Dec 09, 2007 10:12 pm    Post subject: Need to access files Reply with quote
I have had the same problem as you guys. Debugging shows that on

Java:
MediaPlayer mp = MediaPlayer.create(this, R.raw.yourmp3);


mp is not created, so you get an null pointer exception when you try to call a method on mp, namely
Java:
mp.prepare();


I have tried doing an adb push, but the MediaPlayer does not want to read the file, and when I try to emulate an sd card, the file won't open either. I thought it was a permission problem so I went into the adb shell and chmod'ed the sound file, but that didn't help at all.

As a side note: When I point the media player at /system/media/audio/ringtones I can play all four ringtones, so I know my sound is working.

If you have any ideas on how to fix this, please tell me. I'm trying to make a media player and you can see how not being able to play sounds would be a problem for such an app.
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living_sword
Junior Developer


Joined: 23 Nov 2007
Posts: 18
PostPosted: Mon Dec 10, 2007 1:34 pm    Post subject: Re: Need to access files Reply with quote
switch to DDMS view and check if you see 'sdcard' in the File Explorer.
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NumBeast
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Joined: 09 Dec 2007
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PostPosted: Tue Dec 11, 2007 5:03 am    Post subject: re Reply with quote
I know the SDcard works, I can view it with the file browser.
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living_sword
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Joined: 23 Nov 2007
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PostPosted: Tue Dec 11, 2007 7:23 am    Post subject: Reply with quote
post the code. that would give us a better idea of the problem.
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Asgard
Junior Developer


Joined: 15 Dec 2007
Posts: 16
PostPosted: Sun Dec 16, 2007 9:21 pm    Post subject: Reply with quote
I have the same problem with not initialized player (mp = null). If smd knows what is wrong with provided example, please let me know, because this all makes me crazy.
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plusminus
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Joined: 14 Nov 2007
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Location: Germany
PostPosted: Sun Dec 16, 2007 9:28 pm    Post subject: Reply with quote
Hello Asgard,

did you try the second possible solution too Question

Arrow http://www.anddev.org/viewtopic.php?p=580#580

If that doesn't work too, try a file that is shipped with the emulator. (Somewhere in System-Media-Ringtones...)

Regards,
plusminus
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Last edited by plusminus on Sun Dec 16, 2007 10:01 pm; edited 2 times in total
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