Question

无法创建类FacebookViewMdel的实例。 dispatchingAndroidInjector和viewModelFactory返回nullObject引用。试图使用匕首制作Facebook ligin页面。

    public class FacebookActivity extends AppCompatActivity implements IOnRequestCompleted,
        RestFinishLoginWithFbInterface,HasActivityInjector,RestPostAllContactInterface {

    @Inject
    DispatchingAndroidInjector<Activity> dispatchingAndroidInjector;

    @Inject
    ViewModelProvider.Factory viewModelFactory;

    private FacebookViewModel viewModel;



     @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_facebook);
        ButterKnife.bind(this);

       viewModel=ViewModelProviders.of(FacebookActivity.this,viewModelFactory).get(FacebookViewModel.class);


FacebookViewModel.class

    class FacebookViewModel
@Inject constructor(
        application: Application,
         val appRepository: AppRepository
) : AndroidViewModel(application) {

    fun signInWithCustomToken(token: String): Completable =
            appRepository.signInWithCustomToken(token)

    fun setCurrentUser(user: User) {
        appRepository.setCurrentUser(user)
    }
}

 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.miracas.groupgiri/com.miracas.groupgiri.ui.facebook.FacebookActivity}:
java.lang.RuntimeException：无法创建类的实例 com.miracas.groupgiri.ui.facebook.FacebookViewModel 在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2792）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2870）在android.app.ActivityThread.-wrap11（未知来源：0）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1601）在android.os.Handler.dispatchMessage（Handler.java:106）在android.os.Looper.loop（Looper.java:172）在android.app.ActivityThread.main（ActivityThread.java:6590）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:438）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:807）原因：java.lang.RuntimeException：无法创建com.miracas.groupgiri.ui.facebook.FacebookViewModel类的实例在android.arch.lifecycle.ViewModelProvider $ AndroidViewModelFactory.create（ViewModelProvider.java:201）在android.arch.lifecycle.ViewModelProvider.get（ViewModelProvider.java:134）在android.arch.lifecycle.ViewModelProvider.get（ViewModelProvider.java:102）在com.miracas.groupgiri.ui.facebook.FacebookActivity.onCreate（FacebookActivity.java:115）在android.app.Activity.performCreate（Activity.java:7023）在android.app.Activity.performCreate（Activity.java:7014）在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1215）在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2745）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2870）在android.app.ActivityThread.-wrap11（未知来源：0）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1601）在android.os.Handler.dispatchMessage（Handler.java:106）在android.os.Looper.loop（Looper.java:172）在android.app.ActivityThread.main（ActivityThread.java:6590）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:438）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:807）造成原因：java.lang.NoSuchMethodException：[class android.app.Application] 在java.lang.Class.getConstructor0（Class.java:2320）在java.lang.Class.getConstructor（Class.java:1725）

无法创建类ViewModel dagger2

0 个答案: