Change ID Application React-Native

 Let original App name be: com.myApp Let New App Name: 'com.newname.myApp`

1. android\app\src\main\AndroidManifest.xml

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Rename xml attribute: `package="com.newname.myApp"

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2. android\app\src\main\java\com\[yourAppName]\MainActivity.java

Rename first line from package com.myApp; To package com.newname.myApp;

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3. android\app\src\main\java\com\[yourAppName]\MainApplication.java

Rename first line To package com.newname.myApp;

In class private static void initializeFlipper reneme this line:

Class<?> aClass = Class.forName("com.myApp.ReactNativeFlipper");

To

Class<?> aClass = Class.forName("com.newname.myApp.ReactNativeFlipper");

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4. android\app\build.gradle

On the defaultConfig rename applicationId

to "com.newname.myApp"

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5. Run on command line:

     $ npx react-native start
     $ npx react-native run-android