MultiDexApplication class in secondary dex file not found when using AndroidX

Question

I'm using 'androidx.multidex:multidex:2.0.0' and I'm pointing to the MultiDexApplication class from the manifest using:

<application
    android:name="androidx.multidex.MultiDexApplication"
    ...

On the build.gradle I also added the follwoing entry:

defaultConfig {
    ...
    multiDexEnabled true
    ...

When running the application in Android versions older than 5.0 (API 21) I get the following exception:

java.lang.RuntimeException: Unable to instantiate application androidx.multidex.MultiDexApplication: java.lang.ClassNotFoundException: Didn't find class "androidx.multidex.MultiDexApplication" on path [...]

I used the APK browser and I saw that the MultiDexApplication class and the other MultiDex helper classes where in the classes2.dex file. That's probably why it does'nt find the class.

Must I force those classes to be on the main classes.dex file? How can this be fixed?

No, no success yet... Do you have the same problem with the AndroidX multidex? — bplpu, Nov 09 '18 at 09:48
hey are you using fabric? When i removed fabric from my project, it worked. @bplpu — jomin v george, Nov 09 '18 at 15:26
No, I'm not using fabric. It might be that by removing fabric, you got the MultiDex classes in the main dex file by luck. — bplpu, Nov 14 '18 at 07:34
Did you change all your old `com.android.support` libraries to their new counterpart? The full list can be found at https://developer.android.com/jetpack/androidx/migrate — Vrakfall, Dec 01 '18 at 06:05

score 0 · Answer 1 · answered Jan 03 '19 at 14:20

I had the same issue after migrating to AndroidX, though the application class in question was our custom Application class. I tried to clean the project from Android Studio but that didn't work, so eventually I manually removed all the build folders and for good measure did "Invalidate caches and restart" for Android studio as well and that seems to have done the trick for me at least.

score 0 · Answer 2 · answered Jan 23 '19 at 02:37

0

Use the multiDexKeepFile option to require that MultiDexApplication ends up in the main dex file.

answered Jan 23 '19 at 02:37

bannus

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MultiDexApplication class in secondary dex file not found when using AndroidX

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