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import React from 'react';
import { Text } from 'react-native';

const Title = () => (
  <Text>Hello Title</Text>
);
export default Title;

ckdevrel

import React from 'react';
import { AppRegistry } from 'react-native';
import App from './src/components/importcomponentdemo';
  const App = () => (
      <Title />
  );
AppRegistry.registerComponent('ComponentDemo', () => App);

ckdevrel

        JAVA                                           React Native
        
1. public class Toolbar {                     const Toolbar = (props) => {
    private String mTitle;                          return (
    public Toolbar(Props props){              <Text>{props.title} </Text>    
       this.mTitle = props.getTitle();                );
                                                };                 
    }
}

ckdevrel

        JAVA                                            React Native

1. public class App {                           class App extends Component {
      Props probs = new Props();                 render() {
      props.setTitle("Awesome React");            return (
      Toolbar toolbar = new Toolbar(props);         <Toolbar 
                                                        title='Awesome React' />
  //Do your stuff                                  );  
}                                                 }
                                                }  

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class Button extends Component {
   state = {
      text: 'Failure'
   }
  
   updateButtonText = () ⇒ this.setState({ text: 'Success' })
     
   render() {
      return (
         <View>

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mAdapter.SetOnItemClickListener(new RecyclerViewAdapter.OnItemClickListener() {
    @Override
    public void onItemClick(View view, int position, AbstractModel model) {

        //Do your stuff
    }
});

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def getApiKey(){
    def Properties props = new Properties()
    props.load(new FileInputStream(new File('secrets.properties')))
    return props['GOOGLE_MAPS_API_KEY']
}

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defaultConfig {
        defaultPublishConfig 'debug'
        applicationId "YOUR_APPLICATION_ID"
        minSdkVersion 19
        targetSdkVersion 27
        versionCode 1000
        versionName '0.1.0'
        manifestPlaceholders = [ GOOGLE_MAPS_API_KEY:getApiKey()]
}

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<meta-data
    android:name="com.google.android.geo.API_KEY"
    android:value="${GOOGLE_MAPS_API_KEY}" />

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buildTypes {
release {
    minifyEnabled false
    proguardFiles getDefaultProguardFile('proguard-android.txt')
        , 'proguard-rules.pro'
}

      
applicationVariants.all { variant ->
    variant.buildConfigField "String", "GOOGLE_MAPS_API_KEY"