Source link: https://github.com/mmin18/RealtimeBlurView

RealtimeBlurView

It's just a realtime blurring overlay like iOS UIVisualEffectView.

Just put the view in the layout xml, no Java code is required.

// Views to be blurred <ImageView ../>  <com.github.mmin18.widget.RealtimeBlurView  android:layout_width="match_parent"  android:layout_height="match_parent"  app:realtimeBlurRadius="20dp"  app:realtimeOverlayColor="#8000" />  // Views above blurring overlay <Button ../>

Try the sample apk: blurring.apk

Adding to project

Add dependencies in your build.gradle:

 dependencies {

compile 'com.github.mmin18:realtimeblurview:1.1.0'  
}
  android {

buildToolsVersion '24.0.2'

  // Use 23.0.3 or higher
defaultConfig {

 minSdkVersion 15
 renderscriptTargetApi 19
 renderscriptSupportModeEnabled true
 // Enable RS support

}
  
}

Add proguard rules if necessary:

-keep class android.support.v8.renderscript.** {
 *; 
}

Limitations

It will not work with SurfaceView / TextureView like VideoView, GoogleMapView

Performance

RealtimeBlurView use RenderScript to blur the bitmap, just like 500px-android-blur.

Everytime your window draw, it will render a blurred bitmap, so there is a performance cost. Set downsampleFactor>=4 will significantly reduce the render cost. However, if you just want to blur a static view, 500px-android-blur is good enough.

I've run the sample on some old phones like Samsung Galaxy S2, Samsung Galaxy S3, it runs at full FPS. Here is a performance chart while scrolling the list on Nexus 5.