blurBitmap.java

public Bitmap blurBitmap(Bitmap bitmap){
		
		//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(), Config.ARGB_8888);
		
		//Instantiate a new Renderscript
		RenderScript rs = RenderScript.create(getApplicationContext());
		
		//Create an Intrinsic Blur Script using the Renderscript
		ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
		
		//Create the Allocations (in/out) with the Renderscript and the in/out bitmaps
		Allocation allIn = Allocation.createFromBitmap(rs, bitmap);
		Allocation allOut = Allocation.createFromBitmap(rs, 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
		bitmap.recycle();
		
		//After finishing everything, we destroy the Renderscript.
		rs.destroy();
		
		return outBitmap;
		
		
	}