Question

Android Studio 3.6 在我的片段中：

class BluetoothPageFragment : Fragment() {
private lateinit var bluetoothPageViewModel: BluetoothPageViewModel

 override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val viewViewModelProvider = ViewModelProviders.of(activity!!) // one scope
bluetoothPageViewModel = viewViewModelProvider.get(BluetoothPageViewModel::class.java)
}

fun onClickButtonStartSearch(beaconManager: BeaconManager?) {
        bluetoothPageViewModel.doClickButtonStartSearch(beaconManager)
    }

我的视图模型：

class BluetoothPageViewModel(application: Application) : AndroidViewModel(application),
}

当我单击button时，成功调用onClickButtonStartSearch和doClickButtonStartSearch

好。很好但是，如果在单击之前我最小化了应用程序，更改了设备的语言，请回到我的应用程序并单击按钮，然后引发异常：

11-25 17:13:24.950 E/AndroidRuntime(10839): FATAL EXCEPTION: main
11-25 17:13:24.950 E/AndroidRuntime(10839): Process: com.myproject.android.debug, PID: 10839
11-25 17:13:24.950 E/AndroidRuntime(10839): java.lang.IllegalStateException: Could not execute method for android:onClick
11-25 17:13:24.950 E/AndroidRuntime(10839):     at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:402)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at android.view.View.performClick(View.java:5204)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:967)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at android.view.View$PerformClick.run(View.java:21153)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at android.os.Handler.handleCallback(Handler.java:739)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at android.os.Handler.dispatchMessage(Handler.java:95)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at android.os.Looper.loop(Looper.java:148)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at android.app.ActivityThread.main(ActivityThread.java:5417)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at java.lang.reflect.Method.invoke(Native Method)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
11-25 17:13:24.950 E/AndroidRuntime(10839): Caused by: java.lang.reflect.InvocationTargetException
11-25 17:13:24.950 E/AndroidRuntime(10839):     at java.lang.reflect.Method.invoke(Native Method)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
11-25 17:13:24.950 E/AndroidRuntime(10839):     ... 10 more
11-25 17:13:24.950 E/AndroidRuntime(10839): Caused by: kotlin.UninitializedPropertyAccessException: lateinit property bluetoothPageViewModel has not been initialized
11-25 17:13:24.950 E/AndroidRuntime(10839):     at com.myproject.android.ui.fragment.BluetoothPageFragment.onClickButtonStartSearch(BluetoothPageFragment.kt:237)
11-25 17:13:24.950 E/AndroidRuntime(10839):     at com.myproject.android.ui.actviity.QRBluetoothSwipeActivity.onClickButtonStartSearch(QRBluetoothSwipeActivity.kt:213)
11-25 17:13:24.950 E/AndroidRuntime(10839):     ... 12 more

更改语言-> kotlin.UninitializedPropertyAccessException：lateinit属性XXX尚未初始化

0 个答案: