How to set canOverrideExistingModule=true in React Native for Android Apps?

Question

I built an android app using React Native, it got built successfully but when I run the app in my Android Virtual Device it shows up a full red screen with the following err

Answer 1

Solution

Goto android/app/src/main/java/YOURPACKAGE/MainApplication.java

Find method getPackages();

Remove this packages.add(new MapsPackage());

Chill Pill! :)

Answer 2

Open the MainApplication.java file by this address: android/app/src/main/java/com/projectName/MainApplication.java and add the following code to MainApplication.java file:

@Override    
public boolean canOverrideExistingModule() {        
  return true;    
}   

And everything became correct.

Answer 3

Go to file "MainApplication.java" (under .\android\app\src\main\java\com\projectName\)

Make sure that under getPackages() function you don't have duplicate lines (in my case I had "new MapsPackage()" twice).

Fix duplicate imports as well.

Answer 4

You can try check in file MainApplication.java in directory : android\app\src\main\java is have any duplicate package AirMapModule exist or not, and delete 1 if have.

Answer 5

Go to the MainAplication file.

Remove duplicate package and remove duplicate package in getPackages() method

  @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
          new MainReactPackage(),
            new VectorIconsPackage()
      );
    }

Then after try this command in your terminal :

• cd android
• ./gradlew clean

Answer 6

Add only the modules which are not autolinked at here,

        @Override
        protected List<ReactPackage> getPackages() {
          @SuppressWarnings("UnnecessaryLocalVariable")
          List<ReactPackage> packages = new PackageList(this).getPackages();
          // Packages that cannot be autolinked yet can be added manually here, for 
          // example: packages.add(new MyReactNativePackage());         
          return packages;
        }

If the module is autolinked and added the module here, you will get this error.