Sample of pure Java StackBlur usage

NavigationDrawerFragment.java

/**
 * Based on a generated NavigationDrawerFragment from AndroidStudio ...
 */
public class NavigationDrawerFragment extends Fragment {

    private static final int BLUR_RADIUS_RATIO = 20;
    private static final float BLUR_THRESHOLD = 0.1f;

    ...

    private DrawerLayout mDrawerLayout;
    private StackBlurManager stackBlurManager;

    ...
    
    public void setUp(int fragmentId, DrawerLayout drawerLayout, final ImageView originalImageView,
                      final ImageView blurredImageView) {
        mDrawerLayout = drawerLayout;
        final Interpolator interpolator = new DecelerateInterpolator();

        mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
        mDrawerLayout.setScrimColor(Color.TRANSPARENT); // Glassy effect

        ...

        Bitmap oldBitmap = ((BitmapDrawable) originalImageView.getDrawable()).getBitmap();
        stackBlurManager = new StackBlurManager(
                Bitmap.createScaledBitmap(
                        oldBitmap,
                        oldBitmap.getWidth() / 6,
                        oldBitmap.getHeight() / 6,
                        false));
        blurredImageView.setImageBitmap(
                stackBlurManager.process((int) (interpolator.getInterpolation(BLUR_THRESHOLD) * BLUR_RADIUS_RATIO)));
        mDrawerToggle = new ActionBarDrawerToggle(
                getActivity(),
                mDrawerLayout,
                R.drawable.ic_drawer,
                R.string.navigation_drawer_open,
                R.string.navigation_drawer_close) {

            @Override
            public void onDrawerSlide(View drawerView, float slideOffset) {
                super.onDrawerSlide(drawerView, slideOffset);
                //setAlpha() makes it compat >=v11 ...
                if (slideOffset > BLUR_THRESHOLD) {
                    originalImageView.setAlpha(0f);
                    blurredImageView.setImageBitmap(
                            stackBlurManager.process(
                                    (int) (interpolator.getInterpolation(slideOffset) * BLUR_RADIUS_RATIO)));
                } else {
                    originalImageView.setAlpha(((-1 / BLUR_THRESHOLD) * slideOffset + 1));
                }
            }

            @Override
            public void onDrawerClosed(View drawerView) {
                super.onDrawerClosed(drawerView);
                ...
            }

            @Override
            public void onDrawerOpened(View drawerView) {
                super.onDrawerOpened(drawerView);
                ...
            }
        };
        ...
    }
}