[Test Week] Move ListenableHostView into it's own class for ease of unit testing.

Bug: 353303621
Test: Verified with follow-up unit test CL.
Flag: EXEMPT unit test
Change-Id: Idfdaca0bee7f162f6e6ac60b1ddb53458603c227

src/com/android/launcher3/widget/LauncherAppWidgetHost.java

@@ -21,22 +21,16 @@ import static com.android.launcher3.widget.LauncherWidgetHolder.APPWIDGET_HOST_I
 import android.appwidget.AppWidgetHost;
 import android.appwidget.AppWidgetProviderInfo;
 import android.content.Context;
-import android.view.accessibility.AccessibilityNodeInfo;
-import android.widget.RemoteViews;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
 import com.android.launcher3.LauncherAppState;
 import com.android.launcher3.util.Executors;
-import com.android.launcher3.util.SafeCloseable;
 import com.android.launcher3.widget.LauncherWidgetHolder.ProviderChangedListener;
 
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
-import java.util.Set;
-import java.util.WeakHashMap;
 import java.util.function.IntConsumer;
 
 /**
@@ -129,37 +123,4 @@ class LauncherAppWidgetHost extends AppWidgetHost {
     public void clearViews() {
         super.clearViews();
     }
-
-    public static class ListenableHostView extends LauncherAppWidgetHostView {
-
-        private Set<Runnable> mUpdateListeners = Collections.EMPTY_SET;
-
-        ListenableHostView(Context context) {
-            super(context);
-        }
-
-        @Override
-        public void updateAppWidget(RemoteViews remoteViews) {
-            super.updateAppWidget(remoteViews);
-            mUpdateListeners.forEach(Runnable::run);
-        }
-
-        @Override
-        public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
-            super.onInitializeAccessibilityNodeInfo(info);
-            info.setClassName(LauncherAppWidgetHostView.class.getName());
-        }
-
-        /**
-         * Adds a callback to be run everytime the provided app widget updates.
-         * @return a closable to remove this callback
-         */
-        public SafeCloseable addUpdateListener(Runnable callback) {
-            if (mUpdateListeners == Collections.EMPTY_SET) {
-                mUpdateListeners = Collections.newSetFromMap(new WeakHashMap<>());
-            }
-            mUpdateListeners.add(callback);
-            return () -> mUpdateListeners.remove(callback);
-        }
-    }
 }

src/com/android/launcher3/widget/LauncherWidgetHolder.java

@@ -49,7 +49,6 @@ import com.android.launcher3.testing.shared.TestProtocol;
 import com.android.launcher3.util.LooperExecutor;
 import com.android.launcher3.util.ResourceBasedOverride;
 import com.android.launcher3.util.SafeCloseable;
-import com.android.launcher3.widget.LauncherAppWidgetHost.ListenableHostView;
 import com.android.launcher3.widget.custom.CustomWidgetManager;
 
 import java.util.ArrayList;

src/com/android/launcher3/widget/ListenableHostView.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2024 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.widget;
+
+import android.content.Context;
+import android.view.accessibility.AccessibilityNodeInfo;
+import android.widget.RemoteViews;
+
+import com.android.launcher3.util.SafeCloseable;
+
+import java.util.Collections;
+import java.util.Set;
+import java.util.WeakHashMap;
+
+public class ListenableHostView extends LauncherAppWidgetHostView {
+
+    private Set<Runnable> mUpdateListeners = Collections.EMPTY_SET;
+
+    ListenableHostView(Context context) {
+        super(context);
+    }
+
+    @Override
+    public void updateAppWidget(RemoteViews remoteViews) {
+        super.updateAppWidget(remoteViews);
+        mUpdateListeners.forEach(Runnable::run);
+    }
+
+    @Override
+    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
+        super.onInitializeAccessibilityNodeInfo(info);
+        info.setClassName(LauncherAppWidgetHostView.class.getName());
+    }
+
+    /**
+     * Adds a callback to be run everytime the provided app widget updates.
+     * @return a closable to remove this callback
+     */
+    public SafeCloseable addUpdateListener(Runnable callback) {
+        if (mUpdateListeners == Collections.EMPTY_SET) {
+            mUpdateListeners = Collections.newSetFromMap(new WeakHashMap<>());
+        }
+        mUpdateListeners.add(callback);
+        return () -> mUpdateListeners.remove(callback);
+    }
+}