使用Dagger2注入Androidx片段

我想用dagger 2注入我的Androidx片段.在我的活动中我有:

  public class MainActivity extends AppCompatActivity implements HasSupportFragmentInjector
{
    @Inject Reposetory reposetory;
    @Inject DispatchingAndroidInjector dispatchingAndroidInjector;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public AndroidInjector supportFragmentInjector()
    {
        return dispatchingAndroidInjector;
    }
}

问题是,当我想要构建项目时,我收到此错误:

error: cannot find symbol class MapBuilder

当我在DispatchingAndroidInjector 中将androidx.fragment.app.Fragment更改为Fragment时,我不再收到此错误.

Androidx尚不支持,但启用jetifier可能会解决您的问题.

只需将以下代码添加到您的 gradle.properties

android.useAndroidX=true
android.enableJetifier=true

另请参阅这些问题以获取详细信

迁移到androidx库

AndroidInjection支持androidx Fragment

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 - /sf/ask/17360801/

The following worked for me:

First, add gradle dependency the dagger for support library:

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

然后以以下方式在androidx.fragment的子片段中注入：

AndroidSupportInjection.inject(this)