问题描述
我需要在活动的 attachBaseContext 中访问我的 SharedPreferences 实例(以便在此处设置语言环境)，但是需要注入 SharedPreferences 实例不可用，因为注入是在 attachBaseContext 调用之后运行的 onCreate 方法中进行的.我正在使用dagger2进行依赖注入.
I need to access my SharedPreferences instance in the attachBaseContext of my activity (so I can set the locale there), but the injected SharedPreferences instance is not available there as the injection is happening in the onCreate method, which is running after the attachBaseContext call. I am using dagger2 for dependency injection.
有什么想法可以避免创建新的 SharedPreferences 实例吗?
Any idea how I can avoid creating a new SharedPreferences instance?
好吧，所以我认为问题是我试图过多使用匕首，我认为在这种情况下，它根本不合适.在每个活动的 attachBaseContext 中，我必须更新语言环境，并将此更新逻辑提取到 LocaleManager 中，该逻辑需要访问 SharedPreferences 实例.以及我在 attachBaseContext 中获得的 Context . SharedPreferences 实例已经在 AppModule 中，但是我仍然不能 @Inject 将该实例添加到 attachBaseContext 之前的活动中.调用，因为活动的注入发生在 attachBaseContext 之后.
Ok, so I think the problem is that I am trying to use dagger too much, I think in this case it is simply not suitable. In the attachBaseContext of each activity I have to update the locale, and I extracted this updating logic to a LocaleManager which needs access to the SharedPreferences instance and the Context that I get in attachBaseContext. The SharedPreferences instance is already in the AppModule, but I still cannot @Inject it to the activities before the attachBaseContext call, as the activity`s injections happen after attachBaseContext.
推荐答案
只要您可以访问 Component ，就可以添加设置方法
As long as you can access your Component you could add a provision method
@Singleton
@Component(modules = [AppModule::class])
interface AppComponent {
fun inject(myActivity: MyActivity)
fun sharedPreferences(): SharedPreferences
...
}
，然后直接通过 Component 来访问您的 SharedPreferences :
and then access your SharedPreferences directly via the Component:
class MyActivity : AppCompatActivity() {
override fun attachBaseContext(newBase: Context) {
val sharedPreferences = component.sharedPreferences()
...
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
component.inject(this)
}
}
这篇关于在attachBaseContext中使用注入匕首的对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！