new Handler(Looper.myLooper()).post(new Runnable(){
    @Override
    public void run(){
        videoview.setVideoUri("uri");
    }
});

public void setVolume(int volume) {
    try {
        audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, volume, 0);
        ivVoice.setTag(volume != 0);
        updateVoiceImage();
    } catch (Exception e) {
        e.printStackTrace();
    }

}

public void setVolume(int volume) {
    try {
        //if volume not changed , do nothing.
        if(volume != lastVolume){
            audioManager.setStreamVolume(AudioManager.STREAM_MUSIC,volume,0);
            ivVoice.setTag(volume != 0);
            updateVoiceImage();
            lastVolume = volume;
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

}

VideoView myVideoView = (VideoView)findViewById(R.id.myvideoview);
myVideoView.setVideoURI(Uri.parse(url));
myVideoView.setMediaController(new MediaController(this));
myVideoView.requestFocus();
myVideoView.start();