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

IMG

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

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.** { *; }

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

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.

Nexus5

Some improvements (OOM, resize, window background)

Fix view not refreshed issue on PopupWindow

Fix crash when view is very small (draw at least 1px)

Support Popup Window (Use it as dialog background) Ignore UnsatisfiedLinkError if APK is not debuggable.

Support custom shape (by override drawBlurredBitmap()), support view in ContextThemeWrapper.