LauncherAppWidgetHost.java

/*
 * Copyright (C) 2009 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.launcher2;

import android.appwidget.AppWidgetHost;
import android.appwidget.AppWidgetHostView;
import android.appwidget.AppWidgetProviderInfo;
import android.content.Context;

/**
 * 创建LauncherAppWidgetHostView的AppWidgetHost,
 * LauncherAppWidgetHostView可接收长按事件以移动或者缩放widget
 */
public class LauncherAppWidgetHost extends AppWidgetHost {

	Launcher mLauncher;

	public LauncherAppWidgetHost(Launcher launcher, int hostId) {
		super(launcher, hostId);
		mLauncher = launcher;
	}

	@Override
	protected AppWidgetHostView onCreateView(Context context, int appWidgetId,
			AppWidgetProviderInfo appWidget) {
		return new LauncherAppWidgetHostView(context);
	}

	@Override
	public void stopListening() {
		super.stopListening();
		clearViews();
	}

	/*
	 * widgets发生改变时调用
	 * Called when the set of available widgets changes (ie. widget containing
	 * packages are added, updated or removed, or widget components are enabled
	 * or disabled.)
	 */
	protected void onProvidersChanged() {
		// widget packages更新后，重新绑定
		mLauncher.bindPackagesUpdated();
	}
}