我正在尝试使用 Android Dagger ‡ 实现并将DispatchingAndroidInjector
注入我的Application
类:
class MyApp : Application(), HasActivityInjector {
private lateinit var dispatchingAndroidInjector: DispatchingAndroidInjector<Activity>
@Inject set
override fun onCreate() {
super.onCreate()
AppInjector.init(this)
}
override fun activityInjector(): ActivityInjector<Activity> {
return dispatchingAndroidInjector
}
}
但是我得到一个IllegalArgumentExecption
,指出" lateinit
属性尚未初始化":
06-19 10:57:30.773 10797-10797/com.example.app E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.app, PID: 10797
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.app/com.example.app.ui.MainActivity}: kotlin.UninitializedPropertyAccessException: lateinit property dispatchingAndroidInjector has not been initialized
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2666)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6121)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
Caused by: kotlin.UninitializedPropertyAccessException: lateinit property dispatchingAndroidInjector has not been initialized
at com.example.app.MyApp.activityInjector(MyApp.kt:28)
at dagger.android.AndroidInjection.inject(AndroidInjection.java:55)
at com.example.app.injection.AppInjector.handleActivity(AppInjector.kt:41)
at com.example.app.injection.AppInjector.access$handleActivity(AppInjector.kt:14)
at com.example.app.injection.AppInjector$init$1.onActivityCreated(AppInjector.kt:21)
at android.app.Application.dispatchActivityCreated(Application.java:197)
at android.app.Activity.onCreate(Activity.java:961)
at android.support.v4.app.BaseFragmentActivityGingerbread.onCreate(BaseFragmentActivityGingerbread.java:54)
at android.support.v4.app.FragmentActivity.onCreate(FragmentActivity.java:319)
at com.example.app.ui.MainActivity.onCreate(MainActivity.kt:20)
at android.app.Activity.performCreate(Activity.java:6682)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2619)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2727)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1478)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6121)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
这是用于创建AppComponent
和注入MyApp
依赖项的AppInjector
类:
object AppInjector {
fun init(app: MyApp) {
DaggerAppComponent.builder().application(app).build().inject(app)
// ...
}
}
AppComponent
界面:
@Singleton
@Component(modules = arrayOf(
AndroidInjectionModule::class,
AppModule::class,
MainActivityModule::class
)) interface AppComponent {
@Component.Builder interface Builder {
@BindsInstance fun application(app: Application): Builder
fun build(): AppComponent
}
fun inject(app: MyApp)
}
我正在使用属性访问器上的@Inject
注释,如文档中所述,但它似乎不起作用。我做错了什么?
无法测试它,但我认为这是因为您的财产是私有的。Dagger 不使用反射,因此它注入的字段必须从类外部可见才能运行。
(明确写出set
对此没有帮助,因为在这种情况下,它只代表一个私人二传手。请注意,字段对于所有属性都是私有的,非私有属性具有具有更广泛可见性的 getter/setter。
您还应该能够只注释属性而不是其资源库,因此这将是最终结果:
@Inject
lateinit var dispatchingAndroidInjector: DispatchingAndroidInjector<Activity>
如果希望属性是私有的,请考虑改用构造函数注入。
不要使用 lateinit,改用 internal。
更改此内容
private lateinit var dispatchingAndroidInjector: DispatchingAndroidInjector<Activity>
@Inject set
自
private internal var dispatchingAndroidInjector: DispatchingAndroidInjector<Activity>
@Inject set