[NavigationRail] Moves OnNavigationItem listeners to the NavigationBa…

…rView class

to be easier used by developers and other libraries

An example of where the current implementation fails is in Jetpack Navigation component where we rely on setOnNavigationItemSelectedListener and the similar methods in NavigationBarView (setOnItemSelectedListener) are protected.

PiperOrigin-RevId: 367467206
(cherry picked from commit a200a5e)

catalog/java/io/material/catalog/navigationrail/NavigationRailDemoFragment.java

@@ -25,7 +25,6 @@
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
-import android.widget.AdapterView.OnItemSelectedListener;
 import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.Spinner;
@@ -36,8 +35,8 @@
 import androidx.core.math.MathUtils;
 import com.google.android.material.badge.BadgeDrawable;
 import com.google.android.material.badge.BadgeDrawable.BadgeGravity;
+import com.google.android.material.navigation.NavigationBarView.OnItemSelectedListener;
 import com.google.android.material.navigationrail.NavigationRailView;
-import com.google.android.material.navigationrail.NavigationRailView.OnNavigationItemSelectedListener;
 import io.material.catalog.feature.DemoFragment;
 
 /** A base class that provides a demo screen structure for a single navigation rail demo. */
@@ -66,7 +65,7 @@ public View onCreateDemoView(
     initNavigationRail(getContext(), view);
     initNavigationRailDemoControls(view);
 
-    OnNavigationItemSelectedListener navigationItemListener =
+    OnItemSelectedListener navigationItemListener =
         item -> {
           handleAllNavigationRailSelections(item.getItemId());
 
@@ -178,7 +177,7 @@ protected void initNavigationRailDemoControls(View view) {
     badgeGravitySpinner.setAdapter(adapter);
 
     badgeGravitySpinner.setOnItemSelectedListener(
-        new OnItemSelectedListener() {
+        new AdapterView.OnItemSelectedListener() {
           @Override
           public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
             updateBadgeGravity(
@@ -214,8 +213,8 @@ private void initRemoveNavItemButton(Button removeNavItemButton) {
         });
   }
 
-  private void setNavigationRailListeners(OnNavigationItemSelectedListener listener) {
-    navigationRailView.setOnNavigationItemSelectedListener(listener);
+  private void setNavigationRailListeners(OnItemSelectedListener listener) {
+    navigationRailView.setOnItemSelectedListener(listener);
   }
 
   private void removeNavItemsFromNavigationRails() {

docs/components/BottomNavigation.md

@@ -102,6 +102,13 @@ That results in:
 ![Bottom navigation bar with a white background, one selected purple icon and
 another unselected icon.](assets/bottomnav/bottom-nav-default.png)
 
+**Note:** We have deprecated the
+`BottomNavigationView#setOnNavigationItemSelectedListener` and
+`BottomNavigationView#setOnNavigationItemReselectedListener` methods in favor of
+the listeners in `NavigationBarView`. This will allow you to share the same
+selection code between both `BottomNavigation` and `NavigationRail` view
+elements.
+
 ### Making bottom navigation accessible
 
 You should set an `android:title` for each of your `menu` items so that screen

docs/components/NavigationRail.md

@@ -78,7 +78,10 @@ an icon and a text label.
 In code:
 
 ```kt
-NavigationRailView.OnNavigationItemSelectedListener { item ->
+// Listeners are defined on the super class NavigationBarView
+// to support both NavigationRail and BottomNavigation with the
+// same listeners
+NavigationBarView.OnNavigationItemSelectedListener { item ->
     when(item.itemId) {
         R.id.item1 -> {
             // Respond to navigation item 1 click

lib/java/com/google/android/material/bottomnavigation/BottomNavigationView.java

@@ -193,6 +193,7 @@ private void addCompatibilityTopDivider(@NonNull Context context) {
    * @param listener The listener to notify
    * @see #setOnNavigationItemReselectedListener(OnNavigationItemReselectedListener)
    */
+  @Deprecated
   public void setOnNavigationItemSelectedListener(
       @Nullable OnNavigationItemSelectedListener listener) {
     setOnItemSelectedListener(listener);
@@ -205,14 +206,17 @@ public void setOnNavigationItemSelectedListener(
    * @param listener The listener to notify
    * @see #setOnNavigationItemSelectedListener(OnNavigationItemSelectedListener)
    */
+  @Deprecated
   public void setOnNavigationItemReselectedListener(
       @Nullable OnNavigationItemReselectedListener listener) {
     setOnItemReselectedListener(listener);
   }
 
   /** Listener for handling selection events on bottom navigation items. */
+  @Deprecated
   public interface OnNavigationItemSelectedListener extends OnItemSelectedListener {}
 
   /** Listener for handling reselection events on bottom navigation items. */
+  @Deprecated
   public interface OnNavigationItemReselectedListener extends OnItemReselectedListener {}
 }

lib/java/com/google/android/material/navigation/NavigationBarView.java

@@ -312,7 +312,7 @@ public void setElevation(float elevation) {
    * @param listener The listener to notify
    * @see #setOnItemReselectedListener(OnItemReselectedListener)
    */
-  protected void setOnItemSelectedListener(@Nullable OnItemSelectedListener listener) {
+  public void setOnItemSelectedListener(@Nullable OnItemSelectedListener listener) {
     selectedListener = listener;
   }
 
@@ -323,7 +323,7 @@ protected void setOnItemSelectedListener(@Nullable OnItemSelectedListener listen
    * @param listener The listener to notify
    * @see #setOnItemSelectedListener(OnItemSelectedListener)
    */
-  protected void setOnItemReselectedListener(@Nullable OnItemReselectedListener listener) {
+  public void setOnItemReselectedListener(@Nullable OnItemReselectedListener listener) {
     reselectedListener = listener;
   }
 
@@ -681,7 +681,7 @@ public void removeBadge(int menuItemId) {
   }
 
   /** Listener for handling selection events on navigation items. */
-  protected interface OnItemSelectedListener {
+  public interface OnItemSelectedListener {
 
     /**
      * Called when an item in the navigation menu is selected.
@@ -695,7 +695,7 @@ protected interface OnItemSelectedListener {
   }
 
   /** Listener for handling reselection events on navigation items. */
-  protected interface OnItemReselectedListener {
+  public interface OnItemReselectedListener {
 
     /**
      * Called when the currently selected item in the navigation menu is selected again.

lib/java/com/google/android/material/navigationrail/NavigationRailView.java

@@ -260,37 +260,6 @@ protected NavigationRailMenuView createNavigationBarMenuView(@NonNull Context co
     return new NavigationRailMenuView(context);
   }
 
-  /**
-   * Sets a listener that will be notified when a navigation rail item is selected. This listener
-   * will also be notified when the currently selected item is reselected, unless an {@link
-   * OnNavigationItemReselectedListener} has also been set.
-   *
-   * @param listener The listener to notify
-   * @see #setOnNavigationItemReselectedListener(OnNavigationItemReselectedListener)
-   */
-  public void setOnNavigationItemSelectedListener(
-      @Nullable OnNavigationItemSelectedListener listener) {
-    setOnItemSelectedListener(listener);
-  }
-
-  /**
-   * Sets a listener that will be notified when the currently selected navigation rail item is
-   * reselected. This does not require an {@link OnNavigationItemSelectedListener} to be set.
-   *
-   * @param listener The listener to notify
-   * @see #setOnNavigationItemSelectedListener(OnNavigationItemSelectedListener)
-   */
-  public void setOnNavigationItemReselectedListener(
-      @Nullable OnNavigationItemReselectedListener listener) {
-    setOnItemReselectedListener(listener);
-  }
-
-  /** Listener for handling selection events on bottom navigation items. */
-  public interface OnNavigationItemSelectedListener extends OnItemSelectedListener {}
-
-  /** Listener for handling reselection events on bottom navigation items. */
-  public interface OnNavigationItemReselectedListener extends OnItemReselectedListener {}
-
   private int makeMinWidthSpec(int measureSpec) {
     int minWidth = getSuggestedMinimumWidth();
     if (MeasureSpec.getMode(measureSpec) != MeasureSpec.EXACTLY && minWidth > 0) {