Android 11.0 删除全部应用界面的搜索框

packages/apps/Launcher3/res/layout/search_container_all_apps.xml

【思路】
将搜索框的宽度和高度设成0dp即可

<com.android.launcher3.allapps.search.AppsSearchContainerLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@id/search_container_all_apps"
+    android:layout_width="0dp"
+    android:layout_height="0dp"
    android:layout_centerHorizontal="true"
    android:layout_gravity="top|center_horizontal"
    android:background="@drawable/bg_all_apps_searchbox"
    android:elevation="1dp"
    android:focusableInTouchMode="true"
    android:gravity="center"
    android:hint="@string/all_apps_search_bar_hint"
    android:imeOptions="actionSearch|flagNoExtractUi"
    android:inputType="text|textNoSuggestions|textCapWords"
    android:maxLines="1"
    android:padding="8dp"
    android:saveEnabled="false"
    android:scrollHorizontally="true"
    android:singleLine="true"
    android:textColor="?android:attr/textColorSecondary"
    android:textColorHint="@drawable/all_apps_search_hint"
    android:textSize="16sp" />