Может ли кто-нибудь мне помочь, как go назад 1st fragment из 2nd fragment с помощью навигационного ящика, который я уже пробовал с fragmentTransaction.addToBackStack(null);, но он не работает, отправьте его в Home Fragment вот код Home Fragment XML Код макета
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/app_bar_home">
<fragment
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="@navigation/mobile_navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>
1-й фрагмент XML Код
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/select_product_video"
android:background="@drawable/backgroundimage"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".activities.ui.products.SelectProductToUpdateFragment">
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="@+id/contentHome_SwipeRefresh"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.core.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:isScrollContainer="true">
<LinearLayout
android:id="@+id/allContent"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerViewAllProduct"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="8dp"
android:scrollbars="vertical"
android:scrollingCache="true"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
</androidx.recyclerview.widget.RecyclerView>
</LinearLayout>
</androidx.core.widget.NestedScrollView>
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
</FrameLayout>
1-й Fragment JAVA Код OnClick Метод Adapter
Fragment fragment = new ProductUpdateFragment();
FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.nav_host_fragment, fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
ProductUpdateFragment Java Код
public class ProductUpdateFragment extends Fragment implements IOBackPressed {
private SendViewModel sendViewModel;
public View onCreateView(@NonNull LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
sendViewModel =
ViewModelProviders.of(this).get(SendViewModel.class);
View root = inflater.inflate(R.layout.fragment_send, container, false);
final TextView textView = root.findViewById(R.id.text_send);
sendViewModel.getText().observe(this, new Observer<String>() {
@Override
public void onChanged(@Nullable String s) {
textView.setText(s);
}
});
return root;
}
@Override
public boolean onBackPressed() {
getActivity().onBackPressed();
return false;
}
}
Код деятельности
public class MainActivity extends AppCompatActivity {
private AppBarConfiguration mAppBarConfiguration;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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);
// Passing each menu ID as a set of Ids because each
// menu should be considered as top level destinations.
mAppBarConfiguration = new AppBarConfiguration.Builder(
R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow,
R.id.nav_tools, R.id.nav_share, R.id.nav_send)
.setDrawerLayout(drawer)
.build();
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onSupportNavigateUp() {
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
return NavigationUI.navigateUp(navController, mAppBarConfiguration)
|| super.onSupportNavigateUp();
}
@Override
public void onBackPressed()
{
//super.onBackPressed();
int count = getFragmentManager().getBackStackEntryCount();
if(count>0)
getFragmentManager().popBackStack();
}
}