Multiple dex files define Lcom/google/android/gms/internal/zzau

Question

I get the error com.android.dex.DexException: Multiple dex files define Lcom/google/android/gms/internal/zzau; when i run my app The gradle files are

ap

Answer 1

I was also having this issue, I tried many ways to solve this issue. What worked for me was removing following line from my gradle.

compile 'com.google.firebase:firebase-core:16.0.3'

At first I have both firebase-core and firebase-ml-vision (what I need was only firebase-ml-vision) like following.

compile 'com.google.firebase:firebase-ml-vision:17.0.0'
compile 'com.google.firebase:firebase-core:16.0.3'

After I remove the line I got following warning,

Warning: The app gradle file must have a dependency on com.google.firebase:firebase-core for Firebase services to work as intended.

But, according to official docs the core dependency can be absent (https://firebase.google.com/docs/ml-kit/android/detect-faces), so it can be ignored.

Answer 2

For anyone wondering how to fix this for Apache Cordova plugins, I fixed this problem by ensuring all plugin.xml files include the same major and minor version, but latest revision, like this:

<framework src="com.google.firebase:firebase-auth:15.0.+" />
<framework src="com.google.firebase:firebase-messaging:15.0.+" />

When using 15.0.0 above, the com.android.dex.DexException error was raised for some reason. By using + for the revision number (which means, latest), everything worked perfectly with cordova 7.1.0 and cordova-android 6.3.0.

Remember to remove and re-add the android platform after editing plugin.xml from plugins, otherwise your changes won't be applied at all!

Also: Ensure only ONE gradle file is applying this, just in case:

dependencies {
    classpath 'com.android.tools.build:gradle:+'
    classpath 'com.google.gms:google-services:3.0.0'
}