How to create Bitmap blur effect in Android

Category: Android Codez | Last Updates: 31/05/2017

Hey Android developer, It's amazing and easy to create bitmap blur effect. Let's see how to do!

RenderScript Support Library

In this project We are going to use RenderScript Support Library. First of all let's learn something about the RenderScript.

• RenderScript is a component of the Android operating system for mobile devices, that takes advantage of heterogeneous hardware to offer an API for performance acceleration. 
• It allows developers to increase the performance of their applications at the cost of writing a greater amount of more complex code.
• It provides the developer three primary tools:
• A general purpose compute API across different system computing hardware
• A compute API similar to CUDA, OpenCL or GLSL
• A familiar C99-derived language
• It can also be used for 3D graphics. Android 4.2 added new capabilities to script intrinsics, such as Blend and Blur; as well as ScriptGroups which allow you to chain together related RenderScript scripts and execute them with one call.

Using RenderScripts Support Library

In Android Studio Project Add the following configuration to project build.gradle

 defaultConfig {
        minSdkVersion 11
        targetSdkVersion 24

        //add this two lines
        renderscriptTargetApi 19
        renderscriptSupportModeEnabled true
    }

Okay! Now you are ready to use RenderScripts Support Library. Let's start....
I have created a separate java class for create blur effect.

src/BlurMaker.java

In our activity class,

ImageView imageView = (ImageView) findViewById(R.id.imageView);
Bitmap srcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.my_img);

imageView.setImageBitmap(BlurMaker.createBlur(getApplicationContext(), srcBitmap, 7.5f));

RenderScripts  data from Wikipedia