[Search] Hide search view divider for M3E

This change hides the divider on search view between the toolbar and content. It prepares for the contained style in Material 3 Expressive.

PiperOrigin-RevId: 859185807

Author: Material Design Team

docs/components/Search.md

@@ -87,9 +87,9 @@ You can also set a centered style with:
 
 The recommended way to display a `SearchBar` is now inside of an `AppBarLayout`.
 You can specify
-`android:theme="ThemeOverlay.Material3Expressive.AppBarWithSearch"`
-on your `AppBarLayout` to style your `AppBarLayout` and `SearchBar`
-automatically as an AppBar with Search.
+`android:theme="ThemeOverlay.Material3Expressive.AppBarWithSearch"` on your
+`AppBarLayout` to style your `AppBarLayout` and `SearchBar` automatically as an
+AppBar with Search.
 
 The default `SearchBar` style for this theme overlay is the centered text
 configuration. If you would like to specify a start-aligned text `SearchBar`,
@@ -191,6 +191,7 @@ Element                            | Attribute                    | Related meth
 **Flag for navigation icon**       | `app:hideNavigationIcon`     | --                                          | `true`
 **Flag for `DrawerArrowDrawable`** | `app:useDrawerArrowDrawable` | --                                          | `false`
 **Flag for soft keyboard**         | `app:autoShowKeyboard`       | --                                          | `true`
+**Flag for divider**               | `app:dividerVisible`         | --                                          | `true`
 
 #### Styles
 
@@ -428,6 +429,7 @@ it such as:
 
   </com.google.android.material.search.SearchView>
 ```
+
 ### Scrolling behavior
 
 The `SearchBar` can either be used as a fixed, scroll-away, or lift on scroll
@@ -557,6 +559,7 @@ Alternatively, an example of the lift on scroll mode is below:
   </com.google.android.material.search.SearchView>
 </androidx.coordinatorlayout.widget.CoordinatorLayout>
 ```
+
 ### Toolbar transitions
 
 The `SearchBar` component also provides transitions to and from a `Toolbar`,

lib/java/com/google/android/material/search/SearchView.java

@@ -170,6 +170,7 @@ public class SearchView extends FrameLayout
   @ColorInt private final int backgroundColor;
   private boolean useWindowInsetsController;
   private boolean statusBarSpacerEnabledOverride;
+  private final boolean dividerVisible;
   @NonNull private TransitionState currentTransitionState = TransitionState.HIDDEN;
   private Map<View, Integer> childImportantForAccessibilityMap;
   private final OnTouchModeChangeListener touchModeChangeListener =
@@ -218,6 +219,7 @@ public SearchView(@NonNull Context context, @Nullable AttributeSet attrs, int de
     boolean hideNavigationIcon = a.getBoolean(R.styleable.SearchView_hideNavigationIcon, false);
     autoShowKeyboard = a.getBoolean(R.styleable.SearchView_autoShowKeyboard, true);
     backHandlingEnabled = a.getBoolean(R.styleable.SearchView_backHandlingEnabled, true);
+    dividerVisible = a.getBoolean(R.styleable.SearchView_dividerVisible, true);
 
     a.recycle();
 
@@ -249,6 +251,7 @@ public SearchView(@NonNull Context context, @Nullable AttributeSet attrs, int de
     setUpEditText(textAppearanceResId, text, hint);
     setUpBackButton(useDrawerArrowDrawable, hideNavigationIcon);
     setUpClearButton();
+    setUpDivider();
     setUpContentOnTouchListener();
     setUpInsetListeners();
 
@@ -447,6 +450,10 @@ public void afterTextChanged(Editable s) {}
         });
   }
 
+  private void setUpDivider() {
+    divider.setVisibility(dividerVisible ? VISIBLE : GONE);
+  }
+
   @SuppressLint("ClickableViewAccessibility") // Will be handled by accessibility delegate.
   private void setUpContentOnTouchListener() {
     contentContainer.setOnTouchListener(

lib/java/com/google/android/material/search/res-public/values/public.xml

@@ -29,6 +29,7 @@
   <public name="forceDefaultNavigationOnClickListener" type="attr"/>
   <public name="tintNavigationIcon" type="attr"/>
   <public name="textCentered" type="attr"/>
+  <public name="dividerVisible" type="attr"/>
   <public name="Widget.Material3.SearchBar" type="style"/>
   <public name="Widget.Material3.SearchBar.Outlined" type="style"/>
   <public name="Widget.Material3.SearchView" type="style"/>

lib/java/com/google/android/material/search/res/values/attrs.xml

@@ -114,6 +114,8 @@
     <!-- Whether the automatic back handling behavior should be enabled.
          Default is true. -->
     <attr name="backHandlingEnabled" format="boolean"/>
+    <!-- Whether the divider between the toolbar and content is visible. Default is true. -->
+    <attr name="dividerVisible" format="boolean"/>
   </declare-styleable>
 
 </resources>

lib/java/com/google/android/material/search/res/values/styles.xml

@@ -39,7 +39,9 @@
     <item name="liftOnScroll">true</item>
   </style>
 
-  <style name="Widget.Material3Expressive.SearchView" parent="Widget.Material3.SearchView"/>
+  <style name="Widget.Material3Expressive.SearchView" parent="Widget.Material3.SearchView">
+    <item name="dividerVisible">false</item>
+  </style>
 
   <style name="Widget.Material3Expressive.SearchBar.CenteredText.AppBarWithSearch">
     <item name="defaultMarginsEnabled">false</item>