Blur a View

public class BlurBitmapTask extends AsyncTask<Bitmap, Void, Bitmap> {
    private final WeakReference<ImageView> imageViewReference;
    private final RenderScript renderScript;

    private boolean shouldRecycleSource = false;

    public BlurBitmapTask(@NonNull Context context, @NonNull ImageView imageView) {
        // Use a WeakReference to ensure
        // the ImageView can be garbage collected
        imageViewReference = new WeakReference<>(imageView);
        renderScript = RenderScript.create(context);
    }

    // Decode image in background.
    @Override
    protected Bitmap doInBackground(Bitmap... params) {
        Bitmap bitmap = params[0];
        return blurBitmap(bitmap);
    }

    // Once complete, see if ImageView is still around and set bitmap.
    @Override
    protected void onPostExecute(Bitmap bitmap) {
        if (bitmap == null || isCancelled()) {
            return;
        }

        final ImageView imageView = imageViewReference.get();
        if (imageView == null) {
            return;
        }

        imageView.setImageBitmap(bitmap);
    }

    public Bitmap blurBitmap(Bitmap bitmap) {
        // https://plus.google.com/+MarioViviani/posts/fhuzYkji9zz

        //Let's create an empty bitmap with the same size of the bitmap we want to blur
        Bitmap outBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),
                Bitmap.Config.ARGB_8888);

        //Instantiate a new Renderscript

        //Create an Intrinsic Blur Script using the Renderscript
        ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(renderScript, Element.U8_4(renderScript));

        //Create the in/out Allocations with the Renderscript and the in/out bitmaps
        Allocation allIn = Allocation.createFromBitmap(renderScript, bitmap);
        Allocation allOut = Allocation.createFromBitmap(renderScript, outBitmap);

        //Set the radius of the blur
        blurScript.setRadius(25.f);

        //Perform the Renderscript
        blurScript.setInput(allIn);
        blurScript.forEach(allOut);

        //Copy the final bitmap created by the out Allocation to the outBitmap
        allOut.copyTo(outBitmap);

        // recycle the original bitmap
        // nope, we are using the original bitmap as well :/
        if (shouldRecycleSource) {
            bitmap.recycle();
        }

        //After finishing everything, we destroy the Renderscript.
        renderScript.destroy();

        return outBitmap;
    }

    public boolean isShouldRecycleSource() {
        return shouldRecycleSource;
    }

    public void setShouldRecycleSource(boolean shouldRecycleSource) {
        this.shouldRecycleSource = shouldRecycleSource;
    }
}

ImageView imageViewOverlayOnViewToBeBlurred
        .setImageDrawable(ContextCompat.getDrawable(this, android.R.color.transparent));
View viewToBeBlurred.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_LOW);
viewToBeBlurred.setDrawingCacheEnabled(true);
BlurBitmapTask blurBitmapTask = new BlurBitmapTask(this, imageViewOverlayOnViewToBeBlurred);
blurBitmapTask.execute(Bitmap.createBitmap(viewToBeBlurred.getDrawingCache()));
viewToBeBlurred.setDrawingCacheEnabled(false);