Я создавал активность на домашней странице пользователя в Android, и мое приложение зависало, когда приложение пыталось получить доступ к активности UserHome после входа в систему. Я не могу понять, почему это происходит.
Ошибка java .lang.IllegalStateException: Activity com.example.commerce. UserHome@xxxxxxx не установлен NavController на XXXXXXXXXXX
** (X, x обозначают некоторые alphanumeri c адреса)
activity_user_home. xml
<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_user_home"
app:menu="@menu/activity_user_home_drawer" />
<include
layout="@layout/app_bar_user_home"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</androidx.drawerlayout.widget.DrawerLayout>
mobile_navigation. xml
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/mobile_navigation"
app:startDestination="@+id/nav_home"
>
<fragment
android:id="@+id/nav_home"
android:name="com.example.commerce.ui.home.HomeFragment"
android:label="@string/menu_home"
tools:layout="@layout/fragment_home">
<action
android:id="@+id/action_HomeFragment_to_HomeSecondFragment"
app:destination="@id/nav_home_second" />
</fragment>
<fragment
android:id="@+id/nav_home_second"
android:name="com.example.commerce.ui.home.HomeSecondFragment"
android:label="@string/home_second"
tools:layout="@layout/fragment_home_second">
<action
android:id="@+id/action_HomeSecondFragment_to_HomeFragment"
app:destination="@id/nav_home" />
<argument
android:name="myArg"
app:argType="string" />
</fragment>
<fragment
android:id="@+id/nav_gallery"
android:name="com.example.commerce.ui.gallery.GalleryFragment"
android:label="@string/menu_gallery"
tools:layout="@layout/fragment_gallery" />
<fragment
android:id="@+id/nav_slideshow"
android:name="com.example.commerce.ui.slideshow.SlideshowFragment"
android:label="@string/menu_slideshow"
tools:layout="@layout/fragment_slideshow" />
</navigation>
Метод OnCreate из моего класса UserHome
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user_home);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
toolbar.setTitle("Home");
FloatingActionButton fab = findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.bringToFront();
mAppBarConfiguration = new AppBarConfiguration.Builder(
R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow)
.setDrawerLayout(drawer)
.build();
NavController navController = Navigation.findNavController(UserHome.this, R.id.nav_view);
NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
}
Может кто-нибудь объяснить, чем это вызвано.