Android : View should occupy only part of screen

I cannot use setContentView and hence inflating is the only way (this view will go on top of cordova activity). I wish to add a view of a strict size on top and not occupying full screen. This is what I am doing

@Override
public void onCreate(Bundle savedInstanceState) {
        final ScrollView inflate = new ScrollView(this);

        final LinearLayout main = new LinearLayout(this);

        final SurfaceView surfaceView = new SurfaceView(this);
        final SurfaceHolder holder = surfaceView.getHolder();
        WindowManager mW = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        int screenWidth = mW.getDefaultDisplay().getWidth();
        int screenHeight = mW.getDefaultDisplay().getHeight();
        surfaceView.setLayoutParams(new LinearLayout.LayoutParams(screenWidth, screenHeight));

        holder.addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                try {
                    camera = getCamera();
                    camera.setPreviewDisplay(holder);
                    camera.setDisplayOrientation(90);
                    camera.startPreview();
                } catch (IOException e) {
                    Log.i("Lucy", e.getMessage());
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {}

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
            }
        });

        main.addView(surfaceView);
        final TextView text = new TextView(this);
        text.setText("Scanning.....");
        text.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
        main.addView(text);

        inflate.addView(main);    
        inflate.setFillViewport(true);
        addContentView(inflate, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 200, 0));
}

The camera still occupies the full screen. I want the view inflate to just occupy top with height 200. What am i doing it wrong. Doing

surfaceView.setLayoutParams(new LinearLayout.LayoutParams(screenWidth, 200));

solves the problem but it puts the whole camera feed in 200 pixels and the camera is not clear. hence this wont help.