Kotlin和Dagger：我可以使用@Inject的对象仍然可以为空/可选？
我需要一些可以使我的类可以为空/可选的，因为在某些设备上发生运行时错误。
这可能吗？
class MyFragment extends Fragment { @Inject var presenter: MyPresenter? = null // Other codes here... } 我想用presenter作为一个选项，因为一些旧的Android设备特别是抛出这个错误（这是在我删除lazyinit之前）。
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}: cr: 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 cr: 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)
这种情况有办法解决吗？
我有同样的问题，并像这样解决：
@Inject @JvmField var presenter: Presenter? = null
希望它有帮助。