how to make a react native app code example

Example 1: create react-native project

npx react-native init AwesomeProject

Example 2: how to run react native app

react-native run-android 
react-native run-ios

Example 3: react native install

npm install -g react-native-cli

Example 4: how to create a new react native project

$ npx react-native init firstapp

Example 5: how to make apk react native

After run this in cmd

react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/index.android.bundle --assets-dest android/app/src/main/res/

cd android && ./gradlew assembleDebug

then you can get apk app/build/outputs/apk/debug/app-debug.apk