Injecting Androidx Fragments using Dagger 2

Question

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.

score 15 · Answer 1 · answered Jul 06 '19 at 16:16

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)

score 14 · Accepted Answer · edited Feb 14 '20 at 00:39

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:

edited Feb 14 '20 at 00:39

treesAreEverywhere

3,722
4
28
51

answered Aug 13 '18 at 18:09

Saeed Masoumi

8,746
7
57
76

3

thank you for your answer. it worked, but i had to upgrade dagger to 2.16 version . – mahdi jamshidian Aug 14 '18 at 09:50
It still doesn't accept android x Fragment even if I enable jetifier Dagger version 2.19 – Cyph3rCod3r Dec 04 '18 at 05:14
6

I'm using Dagger 2.21 with androidx and it works but you have to use `AndroidSupportInjection.inject(this)` as @cherif mentioned below. – LaVepe Mar 17 '19 at 20:42

Jimit Patel · Answer 3 · 2019-08-19T05:15:16.027

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

edited Aug 19 '19 at 05:15

answered May 23 '19 at 12:02

Jimit Patel

4,265
2
34
58

Since you are commenting now, have you tried koin? If you are using Kotlin, and require to inject, compare Koin vs Dagger and use. https://github.com/InsertKoinIO/koin – Jimit Patel Feb 26 '20 at 12:54
@jimt patel yes i tried it. Was stuck since two days and now it's resolved. Thanks! – Komal Feb 26 '20 at 13:31
yeah i'm using kotlin and sure will try koin. – Komal Feb 26 '20 at 13:41

score 4 · Answer 4 · answered Feb 04 '19 at 12:27

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)

mallaudin · Answer 5 · 2019-01-19T10:08:39.827

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.

Injecting Androidx Fragments using Dagger 2

5 Answers5

Linked