Awesome

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 {
	    implementation 'com.github.mmin18:realtimeblurview:1.2.1'
	}

Support API level < 19

The following step is only required if your minSdkVersion < 19, or you use renderscript support mode.

Both AndroidX and Android Support Library is supported.

	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.** { *; }
-keep class androidx.renderscript.** { *; }

Limitations

Adding multiple RealtimeBlurView (even not visible) may hurt drawing performance, like use it in ListView or RecyclerView.
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.

Nexus5

Changelog

1.2.1 (2019-05-24)

Improve BlurImpl detection.

1.2 (2019-05-22)

Support both AndroidX and Android Support Library.

1.1.2 (2018-05-28)

Bug fix (Draw overlay color in rect).

1.1.1 (2018-05-22)

Fix downsample factor issue when blur radius is very big.

1.1.0 (2017-01-02)

Some improvements (OOM, resize, window background)

1.0.8 (2016-11-29)

Fix view not refreshed issue on PopupWindow

1.0.6 (2016-11-7)

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

1.0.5 (2016-11-5)

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

1.0.4 (2016-9-28)

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