Blurry overlay for react-native android

Edit note:

Change to support react native 0.47+

This is very experimental

A react native android module to add a blurry overlay.

Setup

• install module

 npm i ejoy-react-native-android-blur

• android/settings.gradle

...
include ':react-native-android-blurryoverlay'
project(':react-native-android-blurryoverlay').projectDir = new File(settingsDir, '../node_modules/react-native-android-blurryoverlay')

• android/app/build.gradle

...
android {
    ...
    defaultConfig {
        ...        
        renderscriptTargetApi 23
        renderscriptSupportModeEnabled true
    }    
    ...
}
...
dependencies {
    ...
    compile project(':react-native-android-blurryoverlay')
}

• register module (in MainActivity.java)

import com.kwaak.react.BlurryOverlayPackage;  // <--- import

public class MainActivity extends Activity implements DefaultHardwareBackBtnHandler {

  ......
  private static Activity mActivity = null;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mReactRootView = new ReactRootView(this);

    mActivity = this;
    mReactInstanceManager = ReactInstanceManager.builder()
      .setApplication(getApplication())
      .setBundleAssetName("index.android.bundle")
      .setJSMainModuleName("index.android")
      .addPackage(new MainReactPackage())
      .addPackage(new BlurryOverlayPackage(this))      // <------- add package, the 'this' is super important
      .setUseDeveloperSupport(BuildConfig.DEBUG)
      .setInitialLifecycleState(LifecycleState.RESUMED)
      .build();

    mReactRootView.startReactApplication(mReactInstanceManager, "ExampleRN", null);

    setContentView(mReactRootView);
  }

  ......

}

Usage

The Android root view will be 'screenshotted' and rendered blurry in the view.

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 */
'use strict';
import React, {
  AppRegistry,
  Component,
  StyleSheet,
  Text,
  View,
  Image
} from 'react-native';

var BlurryOverlay = require('react-native-android-blurryoverlay');

class BlurryTest extends Component {
  constructor() {
    super();
    this.state = {
      renderBlurry: false
    }
  }
  componentDidMount() {
    setTimeout(() => {
      this.setState({ renderBlurry: true })
    });
  }
  render() {
    var overlay = (this.state.renderBlurry) ? <BlurryOverlay 
    radius={7} sampling={6} color="#00FFFF00"
    style={[{ 
      position: "absolute", 
      left: 0, 
      top: 0, 
      bottom: 0, 
      right: 0 
    }]}  /> : <View />;
    return (
      <View style={styles.container}>
        <Image
          source={require('./bg.jpg')}
        />
        <Text style={styles.welcome}>
          Welcome to React Native!
        </Text>
        <Text style={styles.instructions}>
          To get started, edit index.android.js
        </Text>
        <Text style={styles.instructions}>
          Shake or press menu button for dev menu
        </Text>
        {overlay}
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});

AppRegistry.registerComponent('BlurryTest', () => BlurryTest);