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I want to inject my Androidx fragments using dagger 2. In my activity I have:

public class MainActivity extends AppCompatActivity implements HasSupportFragmentInjector { @Inject Repository repository; @Inject DispatchingAndroidInjector<androidx.fragment.app.Fragment> dispatchingAndroidInjector; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public AndroidInjector<androidx.fragment.app.Fragment> supportFragmentInjector() { return dispatchingAndroidInjector; } }

the problem is when i want to build the project i get this error:

error: cannot find symbol class MapBuilder

and when i change androidx.fragment.app.Fragment to Fragment in DispatchingAndroidInjector i don't get this error any more.

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5 Answers 5

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15

The following worked for me:

First, add gradle dependency the dagger for support library:

implementation "com.google.dagger:dagger-android-support:2.23.2"

Then in your fragment which is the child of androidx.fragment inject in the following way:

AndroidSupportInjection.inject(this)
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14

Androidx is not supported yet, but enabling jetifier may solve your problem.

Just add the below code to your gradle.properties

android.useAndroidX=true android.enableJetifier=true

Also see these issues for detail:

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3 Comments

thank you for your answer. it worked, but i had to upgrade dagger to 2.16 version .
It still doesn't accept android x Fragment even if I enable jetifier Dagger version 2.19
I'm using Dagger 2.21 with androidx and it works but you have to use AndroidSupportInjection.inject(this) as @cherif mentioned below.
10

Dagger supports were missing for AndroidX. It is added for version 2.21 and above

So you can use it as -

implementation 'com.google.dagger:dagger:2.21' implementation 'com.google.dagger:dagger-android:2.21' implementation 'com.google.dagger:dagger-android-support:2.21' kapt "com.google.dagger:dagger-compiler:2.21" kapt "com.google.dagger:dagger-android-processor:2.21"

Apart from this, if you are using for first time and migrating from support to AndroidX, you will also need to take care in gradle.properties as @Saeed Masoumi mentioned. You need to add following -

android.useAndroidX=true android.enableJetifier=true

Jetifier will help you to migrate from support libraries to AndroidX packages at run time. Best answer you can find for that over here - https://stackoverflow.com/a/52002285/842607

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Since you are commenting now, have you tried koin? If you are using Kotlin, and require to inject, compare Koin vs Dagger and use. github.com/InsertKoinIO/koin
@jimt patel yes i tried it. Was stuck since two days and now it's resolved. Thanks!
yeah i'm using kotlin and sure will try koin.
4

as was suggested before, 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)

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2

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.

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