This is simple WebView application using React Native.

Cd to project path and run:
«npx react-native run-ios»

OR

1. Open /iOS/ReactNativeWebView.xcworkspace in Xcode or run «xed -b iOS»
2. Hit the Run button

Add the following lines to your $HOME/.bash_profile or $HOME/.bashrc (if you are using zsh then ~/.zprofile or ~/.zshrc) config file:

export ANDROID_HOME=$HOME/Library/Android/sdk
export PATH=$PATH:$ANDROID_HOME/emulator
export PATH=$PATH:$ANDROID_HOME/tools
export PATH=$PATH:$ANDROID_HOME/tools/bin
export PATH=$PATH:$ANDROID_HOME/platform-tools

Please make sure you use the correct Android SDK path. You can find the actual location of the SDK in the Android Studio «Preferences» dialog, under Appearance & Behavior → System Settings → Android SDK.

1. Have an Android emulator running (quickest way to get started), or a device connected.
2. cd to your project path
3. run: «npx react-native run-android»

In /android folder
./gradlew assembleRelease

Renamed the project subfolder from:
android/app/src/main/java/MY/APP/OLD_ID/
to:
android/app/src/main/java/MY/APP/NEW_ID/

In android/app/src/main/java/MY/APP/NEW_ID/MainActivity.java:
package MY.APP.NEW_ID;

In android/app/src/main/java/MY/APP/NEW_ID/MainApplication.java:
package MY.APP.NEW_ID;

In android/app/src/main/AndroidManifest.xml:
package="MY.APP.NEW_ID"

In android/app/build.gradle:
applicationId "MY.APP.NEW_ID"

And in android/app/BUCK:

android_build_config(
  package="MY.APP.NEW_ID"
)
android_resource(
  package="MY.APP.NEW_ID"
)

In android/app/src/main/res/values/strings.xml:
<string name="app_name">MY_APP_NEW_NAME</string>

See offical tutorial for the latest up-to-date instructions.