Kotlin和Dagger:我可以对对象使用@Inject还是将其设为可为空/可选吗? [英] Kotlin and Dagger: Can I use @Inject to an object still make it nullable/optional?
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问题描述
由于某些设备上发生的运行时错误,我需要使我的类为可空/可选的内容.
I need something that can make my class nullable/optional because of the runtime errors that is happening on some devices.
这可能吗?
class MyFragment extends Fragment {
@Inject
var presenter: MyPresenter? = null
// Other codes here...
}
我想使用presenter
作为选项,因为特别是旧Android设备上的 SOME 会抛出此错误(这是在删除lazyinit之前).
I wanted to use the presenter
as an option because SOME of the old Android devices especially are throwing this error (this is before I removed the lazyinit).
代码:
class MyFragment extends Fragment {
@Inject
lazyinit var presenter: MyPresenter? = null
// Other codes here...
override fun onDestroy() {
super.onDestroy()
presenter.somecode()
}
}
错误:
Fatal Exception: java.lang.RuntimeException: Unable to destroy activity {com.sample.MyActivity}: c.r: lateinit property presenter has not been initialized
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3497)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3515)
at android.app.ActivityThread.access$1400(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1249)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(NativeStart.java)
Caused by c.r: lateinit property presenter has not been initialized
at com.sample.MyFragment.onDestroy(SourceFile:459)
at android.support.v4.app.Fragment.performDestroy(SourceFile:2434)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1442)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(SourceFile:1528)
at android.support.v4.app.FragmentManagerImpl.moveToState(SourceFile:1595)
at android.support.v4.app.FragmentManagerImpl.dispatchDestroy(SourceFile:2951)
at android.support.v4.app.FragmentController.dispatchDestroy(SourceFile:271)
at android.support.v4.app.FragmentActivity.onDestroy(SourceFile:390)
at android.support.v7.app.AppCompatActivity.onDestroy(SourceFile:209)
at android.app.Activity.performDestroy(Activity.java:5403)
at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1117)
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3484)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3515)
at android.app.ActivityThread.access$1400(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1249)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(NativeStart.java)
是否有解决此问题的方法或解决方法?
Is there are way or workaround for this situation?
推荐答案
我遇到了同样的问题,并按以下方式解决:
I had the same problem and solved like this:
@Inject
@JvmField
var presenter: Presenter? = null
希望有帮助.
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