Create ResourceBasedOverride for SearchSessionManager.

This override will allow Launcher3 to initialize and control a search session implementation.

Bug: 216683257
Test: Manual
Change-Id: I43d4793ef176cfd8e074961286356b96f9222ca9
diff --git a/quickstep/src/com/android/launcher3/search/SearchSessionManager.java b/quickstep/src/com/android/launcher3/search/SearchSessionManager.java
new file mode 100644
index 0000000..da85793
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/search/SearchSessionManager.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.launcher3.search;
+
+import android.app.search.SearchSession;
+import android.content.Context;
+
+import androidx.annotation.IntDef;
+import androidx.annotation.UiThread;
+
+import com.android.launcher3.R;
+import com.android.launcher3.model.data.ItemInfo;
+import com.android.launcher3.util.ResourceBasedOverride;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.List;
+
+/** Manages an all apps search session. */
+public class SearchSessionManager implements ResourceBasedOverride {
+
+    /** Entry state for the search session (e.g. from all apps). */
+    @Retention(RetentionPolicy.SOURCE)
+    @IntDef(value = {ZERO_ALLAPPS, ZERO_QSB})
+    public @interface ZeroEntryState {}
+    public static final int ZERO_ALLAPPS = 1;
+    public static final int ZERO_QSB = 2;
+
+    /** Creates a {@link SearchSessionManager} instance. */
+    public static SearchSessionManager newInstance(Context context) {
+        return Overrides.getObject(
+                SearchSessionManager.class, context, R.string.search_session_manager_class);
+    }
+
+    /** The current {@link SearchSession}. */
+    @UiThread
+    public void setSearchSession(SearchSession session) {}
+
+    /** {@code true} if IME is shown. */
+    public void setIsImeShown(boolean value) {}
+
+    /** Returns {@code true} if IME is enabled. */
+    public boolean getIsImeEnabled() {
+        return false;
+    }
+
+    /** The current entry state for search. */
+    public @ZeroEntryState int getEntryState() {
+        return ZERO_ALLAPPS;
+    }
+
+    /**
+     * When user enters all apps surface via tap on home widget, set the state to
+     * {@code #ZERO_QSB}. When user exits, reset to {@code #ZERO_ALLAPPS}
+     */
+    public void setEntryState(@ZeroEntryState int state) {}
+
+    /** This will be called before opening all apps, to prepare zero state suggestions. */
+    public void prepareZeroState() {}
+
+    /** Apply predicted items for the search zero state. */
+    public void setZeroStatePredictedItems(List<ItemInfo> items) {}
+
+    /** Returns {@code true} if the session is valid and should be enabled. */
+    public boolean isValidSession() {
+        return false;
+    }
+
+    /** Called when the search session is destroyed. */
+    public void onDestroy() {}
+}
diff --git a/res/values/config.xml b/res/values/config.xml
index e2fd0e3..76d1161 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -91,6 +91,7 @@
     <string name="custom_activity_picker" translatable="false">
         com.android.customization.picker.CustomizationPickerActivity</string>
     <string name="local_colors_extraction_class" translatable="false"></string>
+    <string name="search_session_manager_class" translatable="false"></string>
 
     <!-- Accessibility actions -->
     <item type="id" name="action_remove" />