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//need to create a raw folder in res folder. Add video to the folder
//need VideoView in layout

VideoView videoView = findViewById(R.id.videoView);
videoView.setVideoPath("android.resource://" + getPackageName() + "/" + R.raw.demovideo);
MediaController mediaController = new MediaController(this);
mediaController.setAnchorView(videoView);
videoView.setMediaController(mediaController);
videoView.start();