QR-surfaceview.java

        mQRSurfaceView = new SurfaceView(this);

        FrameLayout.LayoutParams lParams = new FrameLayout.LayoutParams(
                FrameLayout.LayoutParams.WRAP_CONTENT,
                FrameLayout.LayoutParams.WRAP_CONTENT);
        lParams.leftMargin = 100;
        lParams.topMargin = 0;
        lParams.gravity = Gravity.TOP | Gravity.START;
        mFrameLayout.addView(mQRSurfaceView, lParams);

        mQRSurfaceView.setZOrderOnTop(true);
        mQRSurfaceView.setZOrderMediaOverlay(true);
        mQRSurfaceView.getHolder().setFixedSize(500, 768);


        qrEader = new QREader.Builder(this, mQRSurfaceView, new QRDataListener() {
            @Override
            public void onDetected(final String data) {
                Log.d("QREader", "Value : " + data);
            }
        }).facing(QREader.BACK_CAM)
                .enableAutofocus(true)
                .height(mQRSurfaceView.getHeight())
                .width(mQRSurfaceView.getWidth())
                .build();