BackPass working code Drawer and BottomNavigationViw on Fragment

BottomNavigationViw code 

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<com.google.android.material.bottomnavigation.BottomNavigationView android:id="@+id/bottom_nav_admin" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" app:labelVisibilityMode="labeled" app:menu="@menu/admin_menu" />

1.     @Override indicates that you are overriding the onBackPressed method from the parent class (presumably 

AppCompatActivity or similar) to customize the back button behavior.

2.     Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.frament_

container_admin);: This line retrieves the currently displayed fragment within the 

fragment_container_admin container using the FragmentManager. It assumes that the

 fragments are being replaced within this container.

3.     BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_nav_admin);: 

This line retrieves a BottomNavigationView from your layout with the ID bottom_nav_admin. 

You are going to use this view to change the selected item.

4.     The code then checks which fragment is currently being displayed by using the 

instanceof operator. If the current fragment is an instance of AdminSettingFragment, 

it sets the selected item in the BottomNavigationView to R.id.action_Admin_View. 

If it's an instance of AdminScheduleFragment, it sets the selected item to R.id.action_Admin_Setting.

5.     If the current fragment is neither of the above types, it calls super.onBackPressed(), which invokes the default behavior for the back button. This will typically lead to the activity being popped from the back stack or, if there's no more back stack, closing the activity.

So, in summary, this code is designed to customize the behavior of the back button based on the currently displayed fragment. If it's a specific fragment, it changes the selected item in the BottomNavigationView, and if it's any other fragment, it performs the default back button behavior.

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@Override public void onBackPressed() { Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.frament_container_admin); BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_nav_admin); // if ((fragment instanceof AdminViewFragment)) { // bottomNavigationView.setSelectedItemId(R.id.action_Admin_Home); // // loadFragment(new AdminHomeFragment()); // } if ((fragment instanceof AdminSettingFragment)) { bottomNavigationView.setSelectedItemId(R.id.action_Admin_View); // loadFragment(new AdminHomeFragment()); } else if ((fragment instanceof AdminScheduleFragment)) { bottomNavigationView.setSelectedItemId(R.id.action_Admin_Setting); // loadFragment(new AdminHomeFragment()); } else { super.onBackPressed(); } }

Drawer code

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<!--Drawer navigation show --> <com.google.android.material.navigation.NavigationView android:layout_width="match_parent" android:layout_height="match_parent" android:layout_gravity="start" android:id="@+id/nav_view" app:menu="@menu/drawer_menu"/> <!--end Drawer navigation show -->

Here's an explanation of what this code does:

1. onBackPressed is an overridden method that handles the back button press in your Android activity.

2. It first checks if the navigation drawer (identified by R.id.drawer_layout) is open using drawer.isDrawerOpen(GravityCompat.START). If the drawer is open, it closes it to allow users to navigate away from the drawer.

3. If the navigation drawer is closed, the code proceeds to handle the back press. It retrieves the currently displayed fragment using getSupportFragmentManager().findFragmentById(R.id.frame_layout). This assumes that you have a container (e.g., a FrameLayout) with the ID frame_layout where you replace your fragments.

4. Depending on the type of fragment you have, it performs different actions:

   • If the current fragment is an instance of AddNewMumberFragment, it loads a new fragment, UserDetailsShowFragment, using the loadFragment method.
   • If the current fragment is an instance of UpdateUserFragment, it also loads the UserDetailsShowFragment.
   • If the current fragment is neither of the above types, it calls super.onBackPressed(), which invokes the default behavior for the back button. This typically leads to the activity being popped from the back stack or, if there's no more back stack, closing the activity.

5. The loadFragment method is used to replace the current fragment with a new fragment within the frame_layout container.

In summary, this code handles the back button press by checking the current fragment and taking appropriate actions. If it's one of the specified fragments, it replaces it with a different fragment; otherwise, it performs the default back button behavior.

 

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@Override public void onBackPressed() { DrawerLayout drawer = findViewById(R.id.drawer_layout); NavigationView navigationView = findViewById(R.id.nav_view); if (drawer.isDrawerOpen(GravityCompat.START)) { // If the navigation drawer is open, close it drawer.closeDrawer(GravityCompat.START); } else { // If the navigation drawer is closed, handle the back press Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.frame_layout); if (fragment instanceof AddNewMumberFragment) { // If the current fragment is AddNewMemberFragment, switch to a different fragment // For example: loadFragment(new UserDetailsShowFragment()); } else if (fragment instanceof UpdateUserFragment) { // If the current fragment is AddNewMemberFragment, switch to a different fragment // For example: loadFragment(new UserDetailsShowFragment()); } else{ // If the current fragment is not AddNewMemberFragment, proceed with the default back behavior super.onBackPressed(); } } } private void loadFragment(Fragment f) { FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); ft.replace(R.id.frame_layout, f); ft.commit(); }