Used to play a video file from the file system.

Android_play_video_intent

    private void playVideo(final File file) {
        Uri intentUri = Uri.fromFile(file);
        file.setReadable(true, false); // security?
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_VIEW);
        intent.setDataAndType(intentUri, "video/*");
        startActivity(intent);
    }