dagger android support to androidx.fragment

Question

How to inject a fragment from the package androidx.fragment.app.Fragment ?

I'm using the dagger-android framework to inject my dependencies in my code.

As the documentation says I do this to inject my fragment

@Override public void onAttach(Activity activity) {     AndroidInjection.inject(this);     super.onAttach(activity);     // ... } 

the problem is that AndroidSupportInjection class accept only fragments of the package android.support.v4.app.Fragment or if I use AndroidInjection class only accept fragments of the package android.app.Fragment and I want to use fragments of the androidx.fragment.app.Fragment package.

Also DaggerFrament extend from android.support.v4.app.Fragment and want to use a fragment from androidx

And If I try to implement HasSupportFragmentInjector also this interface use a fragment from android.support

Answer 1

add the below code to your gradle.properties

android.useAndroidX=true
android.enableJetifier=true

And if you are trying to inject into a Fragment you have to replace AndroidInjection.inject(this) with AndroidSupportInjection.inject(this)

Answer 2

I had the same problem in case of HasFragmentInjector. You need to use HasSupportFragmentInjector for fragment injection. This is because, HasFragmentInjector uses android.app.Fragment which is not effected by jetifier. You need to add android-dagger-support library, jetifier converts all the support packages to androidx in Studio 3.3 (if jetifier is enabled).

If jetifier does not change support packages to androidx packages. You can download jetifier tool from here and convert the android-dagger-support.aar file manually by using the following command.

./jetifier-standalone -i dagger-android-support-<version>.aar -o <output-name> 

Then add the library to your project. This is the HasSupportFragment class after conversion

import androidx.fragment.app.Fragment; import dagger.android.AndroidInjector;  public interface HasSupportFragmentInjector {     AndroidInjector<Fragment> supportFragmentInjector(); } 

Somehow, jetifier tool was not converting libraries in AndroidStudio. I had to do it manually.