How to play a video file in android?

Most of the time, I'm using following code:

MediaPlayer mp = new MediaPlayer();
    mp.setDataSource(PATH_TO_FILE);
    mp.prepare();
    mp.start();

for more information look at this page: http://developer.android.com/guide/topics/media/index.html and http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/media/MediaPlayerDemo_Video.html

I think this may help you find some solution.

mp=new MediaPlayer();                    
mp.setDataSource(path);
mp.setScreenOnWhilePlaying(true);
mp.setDisplay(holder);
mp.prepare();
mp.start();

The VideoView class can load images from various sources (such as resources or content providers), takes care of computing its measurement from the video so that it can be used in any layout manager, and provides various display options such as scaling and tinting.

Code:

videoView = (VideoView)findViewById(R.id.ViewVideo);
videoView.setVideoURI(Uri.parse(“android.resource://” + getPackageName() +”/”+R.raw.video));
videoView.setMediaController(new MediaController(this));
videoView.requestFocus();
videoView.start();

if you want see source code : Play video file using VideoView in Android

If you are trying this in your emulator, you might have to try it in a real device, because sometimes I too use face the same problem. I will not be able to view the video in emulator, but the video will play without any problem in the mobile. the problem is, I think with the emulator, not with your code.