java - Collapsing Toolbar only for one Fragment in Navigation View

Java - Collapsing Toolbar only for one Fragment in Navigation View

To implement a collapsing toolbar that is only visible for one specific fragment within a NavigationView in Android using Java, you can use a combination of a CoordinatorLayout, AppBarLayout, CollapsingToolbarLayout, and Toolbar in your layout XML file. Here's how you can achieve this:

Step 1: Create the Layout XML

In your layout XML file (fragment_layout.xml), define the CoordinatorLayout, AppBarLayout, CollapsingToolbarLayout, Toolbar, and your fragment's content:

<?xml version="1.0" encoding="utf-8"?> <androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <com.google.android.material.appbar.AppBarLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:theme="@style/AppTheme.AppBarOverlay"> <com.google.android.material.appbar.CollapsingToolbarLayout android:id="@+id/collapsing_toolbar" android:layout_width="match_parent" android:layout_height="match_parent" app:layout_scrollFlags="scroll|exitUntilCollapsed"> <androidx.appcompat.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_collapseMode="pin" app:title="Your Title" app:popupTheme="@style/AppTheme.PopupOverlay" /> </com.google.android.material.appbar.CollapsingToolbarLayout> </com.google.android.material.appbar.AppBarLayout> <!-- Your fragment content here --> <FrameLayout android:id="@+id/fragment_container" android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="@string/appbar_scrolling_view_behavior" /> </androidx.coordinatorlayout.widget.CoordinatorLayout>

Step 2: Implement in Your Fragment

In your fragment class (YourFragment.java), inflate the layout and set up the toolbar:

import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.fragment.app.Fragment; import androidx.appcompat.widget.Toolbar; public class YourFragment extends Fragment { @Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_layout, container, false); // Set up the toolbar Toolbar toolbar = rootView.findViewById(R.id.toolbar); toolbar.setTitle("Your Fragment Title"); ((AppCompatActivity) requireActivity()).setSupportActionBar(toolbar); ActionBar actionBar = ((AppCompatActivity) requireActivity()).getSupportActionBar(); if (actionBar != null) { actionBar.setDisplayHomeAsUpEnabled(true); } // Load your fragment content here return rootView; } }

Step 3: Implement NavigationView

In your Activity layout XML that contains the NavigationView, include a FrameLayout to hold your fragments:

<FrameLayout android:id="@+id/fragment_container" android:layout_width="match_parent" android:layout_height="match_parent" />

Step 4: Handle Fragment Transactions

In your Activity, handle fragment transactions when a NavigationView item is selected:

import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import androidx.fragment.app.Fragment; import androidx.fragment.app.FragmentManager; import androidx.fragment.app.FragmentTransaction; import com.google.android.material.navigation.NavigationView; import android.view.MenuItem; public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Set up the NavigationView NavigationView navigationView = findViewById(R.id.navigation_view); navigationView.setNavigationItemSelectedListener(this); // Load the initial fragment loadFragment(new YourFragment()); } @Override public boolean onNavigationItemSelected(MenuItem item) { // Handle navigation view item clicks here int id = item.getItemId(); switch (id) { case R.id.nav_item_1: loadFragment(new YourFragment()); break; // Add more cases for other navigation items as needed } return true; } private void loadFragment(Fragment fragment) { // Replace fragment_container with the selected fragment FragmentManager fragmentManager = getSupportFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); fragmentTransaction.replace(R.id.fragment_container, fragment); fragmentTransaction.addToBackStack(null); fragmentTransaction.commit(); } }

Replace YourFragment with the name of your fragment class.

This setup will show the collapsing toolbar only for the fragment specified in YourFragment, and other fragments loaded in the same container will not have the collapsing toolbar. Adjust the toolbar titles and navigation items according to your application's requirements.

Examples

  1. Implementing a Collapsing Toolbar in a Single Fragment:

    • Description: How to set up a collapsing toolbar that appears only in one specific fragment of a navigation view setup in Android using Java.
    • Code:
      // In your fragment's onCreateView method CollapsingToolbarLayout collapsingToolbarLayout = requireActivity().findViewById(R.id.collapsing_toolbar_layout); AppBarLayout appBarLayout = requireActivity().findViewById(R.id.app_bar_layout); Toolbar toolbar = requireActivity().findViewById(R.id.toolbar); // Configure collapsing toolbar behavior appBarLayout.setExpanded(true); // Ensure toolbar is expanded initially appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() { boolean isShow = false; int scrollRange = -1; @Override public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) { if (scrollRange == -1) { scrollRange = appBarLayout.getTotalScrollRange(); } if (scrollRange + verticalOffset == 0) { collapsingToolbarLayout.setTitle("Title when collapsed"); isShow = true; } else if (isShow) { collapsingToolbarLayout.setTitle(""); // Careful there should a space between double quote otherwise it wont work isShow = false; } } });

  2. Setting Up Navigation View with Multiple Fragments:

    • Description: How to structure a navigation view with multiple fragments in an Android app using Java, ensuring each fragment has its own collapsing toolbar.
    • Code:
      <!-- activity_main.xml --> <androidx.drawerlayout.widget.DrawerLayout> <androidx.coordinatorlayout.widget.CoordinatorLayout> <com.google.android.material.appbar.AppBarLayout> <com.google.android.material.appbar.CollapsingToolbarLayout android:id="@+id/collapsing_toolbar_layout" android:layout_width="match_parent" android:layout_height="match_parent" app:layout_scrollFlags="scroll|exitUntilCollapsed"> <androidx.appcompat.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_collapseMode="pin" /> </com.google.android.material.appbar.CollapsingToolbarLayout> </com.google.android.material.appbar.AppBarLayout> <androidx.core.widget.NestedScrollView app:layout_behavior="@string/appbar_scrolling_view_behavior"> <!-- Your fragment content here --> </androidx.core.widget.NestedScrollView> </androidx.coordinatorlayout.widget.CoordinatorLayout> <com.google.android.material.navigation.NavigationView android:id="@+id/navigation_view" android:layout_gravity="start" app:headerLayout="@layout/nav_header" app:menu="@menu/nav_menu" /> </androidx.drawerlayout.widget.DrawerLayout>

  3. Handling Fragment Transactions in Navigation View:

    • Description: How to manage fragment transactions within a navigation view setup to show/hide specific fragments with their respective collapsing toolbars.
    • Code:
      // In your MainActivity.java NavigationView navigationView = findViewById(R.id.navigation_view); navigationView.setNavigationItemSelectedListener(item -> { Fragment fragment; switch (item.getItemId()) { case R.id.nav_fragment1: fragment = new Fragment1(); break; case R.id.nav_fragment2: fragment = new Fragment2(); break; default: return false; } getSupportFragmentManager().beginTransaction() .replace(R.id.fragment_container, fragment) .commit(); return true; });

  4. Customizing Toolbar Behavior Based on Fragment:

    • Description: How to customize the collapsing toolbar behavior dynamically based on the currently displayed fragment in an Android navigation view setup using Java.
    • Code:
      // Inside your Fragment's onCreateView or onViewCreated AppBarLayout appBarLayout = requireActivity().findViewById(R.id.app_bar_layout); if (this instanceof YourTargetFragment) { appBarLayout.setExpanded(true); // Expand toolbar for this fragment } else { appBarLayout.setExpanded(false); // Collapse toolbar for other fragments }

  5. Adding Scroll Flags to Toolbar in XML:

    • Description: How to define scroll flags in XML for the collapsing toolbar to control its behavior when scrolling within fragments of a navigation view.
    • Code:
      <!-- Inside CollapsingToolbarLayout --> app:layout_scrollFlags="scroll|enterAlways"

  6. Handling Toolbar Visibility Changes:

    • Description: Implementing logic to show/hide the toolbar based on scroll position within specific fragments of a navigation view setup using Java.
    • Code:
      // Inside your fragment's AppBarLayout.OnOffsetChangedListener @Override public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) { if (Math.abs(verticalOffset) == appBarLayout.getTotalScrollRange()) { // Collapsed toolbar.setVisibility(View.GONE); } else { // Expanded toolbar.setVisibility(View.VISIBLE); } }

  7. Customizing Toolbar Title:

    • Description: Changing the title of the collapsing toolbar dynamically based on the current fragment in an Android navigation view using Java.
    • Code:
      // Inside your fragment CollapsingToolbarLayout collapsingToolbarLayout = requireActivity().findViewById(R.id.collapsing_toolbar_layout); collapsingToolbarLayout.setTitle("Your Custom Title");

  8. Managing Fragment Lifecycle Events:

    • Description: Ensuring proper setup and cleanup of toolbar-related resources during fragment lifecycle events in an Android navigation view setup using Java.
    • Code:
      // Inside your fragment @Override public void onDestroyView() { super.onDestroyView(); AppBarLayout appBarLayout = requireActivity().findViewById(R.id.app_bar_layout); appBarLayout.setExpanded(true); // Reset toolbar state if needed }

  9. Incorporating Material Design Components:

    • Description: Integrating material design components like CollapsingToolbarLayout, AppBarLayout, and NavigationView in an Android app using Java.
    • Code:
      <!-- Inside your layout files --> <com.google.android.material.appbar.CollapsingToolbarLayout android:id="@+id/collapsing_toolbar_layout" android:layout_width="match_parent" android:layout_height="match_parent" app:layout_scrollFlags="scroll|exitUntilCollapsed"> <com.google.android.material.appbar.AppBarLayout android:id="@+id/app_bar_layout" android:layout_width="match_parent" android:layout_height="wrap_content" android:theme="@style/AppTheme.AppBarOverlay"> <androidx.appcompat.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_collapseMode="pin" /> </com.google.android.material.appbar.AppBarLayout> </com.google.android.material.appbar.CollapsingToolbarLayout>

  10. Handling Toolbar Behavior on Scroll Events:

    • Description: Implementing logic to change toolbar behavior (collapse/expand) based on scroll events within specific fragments of a navigation view in Android using Java.
    • Code:
      // Inside your fragment AppBarLayout appBarLayout = requireActivity().findViewById(R.id.app_bar_layout); appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() { boolean isShown = true; int scrollRange = -1; @Override public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) { if (scrollRange == -1) { scrollRange = appBarLayout.getTotalScrollRange(); } if (scrollRange + verticalOffset == 0) { // Collapsed toolbar.setVisibility(View.GONE); isShown = true; } else if (isShown) { // Expanded toolbar.setVisibility(View.VISIBLE); isShown = false; } } });

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