How to set canOverrideExistingModule=true in React Native for Android Apps?
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How to set canOverrideExistingModule=true in React Native for Android Apps?
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 error:
I have not done native app development ever before neither do I have any knowledge of Java so I have no idea what this error means and how to fix this.
5 Answers
5
The name of the package associated to this error is not AirMapModule but MapsPackage from com.airbnb.android.react.maps.
AirMapModule
MapsPackage
com.airbnb.android.react.maps
In your MainApplication.java in directory : android/app/src/main/java/../../ remove any duplicate entry of :
MainApplication.java
android/app/src/main/java/../../
import com.airbnb.android.react.maps.MapsPackage
new MapsPackage()
getPackages
This error rise when you are trying to import same package twice in MainApplication.java file
– Digvijay Machale
Feb 12 at 5:26
this works but everytime i link a library it repeat itself
– Sir Koswara
Mar 6 at 2:37
just remove the duplicate imports from MainApplication.java
– John
May 4 at 19:48
Specially signed in to upvote these answers
– Akshay Seth
Aug 3 at 12:15
Go to file "MainApplication.java" (under .androidappsrcmainjavacomprojectName)
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.
Good luck
@Override
public boolean canOverrideExistingModule()
return true;
Add these code to your native module constructor would be fine
Does not work for me
– fungusanthrax
Sep 26 '17 at 20:50
You can try check in file MainApplication.java in directory : androidappsrcmainjava is have any duplicate package AirMapModule exist or not, and delete 1 if have.
MainApplication.java
androidappsrcmainjava
There is neither a package nor even a variable by the name AirMapModule in the file MailApplication.java :(
– UtkarshPramodGupta
Jan 25 '17 at 9:16
what version of react-native you use ?
– Nguyên Hoàng
Jan 25 '17 at 9:22
react-native-cli: 2.0.1 react-native: 0.36.0
– UtkarshPramodGupta
Jan 25 '17 at 9:43
Did you try to check file
MainActivity.java in the same directory too ?– Nguyên Hoàng
Jan 25 '17 at 10:25
MainActivity.java
Yeah, i just did. Even that doesn't have anything related to AirMapModule. :(
– UtkarshPramodGupta
Jan 25 '17 at 10:58
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 :
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The first bullet is mentioned everywhere online, but this was the first mention of the second place to look for duplicates. Thank you.
– David Sinclair
Jun 16 '17 at 21:37