2015-10-30-在Launcher的固定View上添加Widget_墨迹天氣

• 擷取系統已安裝的widget清單
• 添加widget到某個View中
• 其他

首先感謝thl789部落格中關于widget的解釋，看後受益很多。有益的文章連結如下：

Android AppWidget系統架構

Android中選取并綁定AppWidget

Android中AppWidget的分析與應用：AppWidgetProvider

Android中Launcher對于AppWidget處理的分析：AppWidgetHost角色

Android中RemoteViews的實作

下面是我的内容：

擷取系統已安裝的widget清單

測試代碼：

// Test code，擷取系統已安裝的Widget清單。
List<AppWidgetProviderInfo> installed = Launcher.mAppWidgetManager.getInstalledProviders();
for(int index = ; index < installed.size(); index ++) {
    ComponentName cn = installed.get(index).provider;
    Log.i("test", "" + cn.getPackageName() + ", " + cn.getClassName());
}
           

列印log示例如下：

Line : - :: I/test    ( ): com.moji.moweather, com.moji.moweather.widget.CMojiWidget4x1
Line : - :: I/test    ( ): com.moji.moweather, com.moji.moweather.widget.CMojiWidget4x2
           

添加widget到某個View中

總共分為5步：

1. 使用AppHost配置設定appWidgetId。

2. 綁定appWidetId到墨迹天氣Intent上。

3. AppWidgetmanaget根據appWidgetId解析出appWidgetInfo。

4. AppWidgetHostView使用appWidgetId和appWidgetInfo建立View。

5. 将上一步建立好的View添加到目标測試View中。

int appWidgetId = Launcher.mAppWidgetHost.allocateAppWidgetId();
Intent intent = new Intent();
intent.setClassName("com.moji.moweather", "com.moji.moweather.widget.CMojiWidget4x2");
Launcher.mAppWidgetManager.bindAppWidgetId(appWidgetId, intent.getComponent());
AppWidgetProviderInfo appWidgetInfo = Launcher.mAppWidgetManager.getAppWidgetInfo(appWidgetId);
Launcher.mAppWidgetHostView = (LauncherAppWidgetHostView) Launcher.mAppWidgetHost.createView(context, appWidgetId, appWidgetInfo);
testView.addView(Launcher.mAppWidgetHostView);// 添加widget到測試view中
           

其他：

// 擷取系統已安裝的AppWidgetManager.ACTION_APPWIDGET_UPDATE的類清單
Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
String pkgName = "com.moji.moweather";
intent.setPackage(pkgName);
PackageManager pkgManger = context.getPackageManager();
List<ResolveInfo> broadcastReceivers = pkgManger
        .queryBroadcastReceivers(intent, PackageManager.GET_META_DATA);
final int N = broadcastReceivers == null ?  : broadcastReceivers
        .size();
for (int i = ; i < N; i++) {
    ResolveInfo ri = broadcastReceivers.get(i);
    ActivityInfo ai = ri.activityInfo;
    if ((ai.applicationInfo.flags & ApplicationInfo.FLAG_EXTERNAL_STORAGE) != ) {
        continue;
    }
    Log.i("test", "" + ai.packageName + ", " + ai.applicationInfo.className); //列印包名和類名
    if (pkgName.equals(ai.packageName)) {
    }
}
           

Android原生launcher中的LauncherAppWidgetHost.java和LauncherAppWidgetHostView.java代碼如下：

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.
 */

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

/**
 * Specific {@link AppWidgetHost} that creates our {@link LauncherAppWidgetHostView}
 * which correctly captures all long-press events. This ensures that users can
 * always pick up and move widgets.
 */
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();
    }

    protected void onProvidersChanged() {
        // Once we get the message that widget packages are updated, we need to rebind items
        // in AppsCustomize accordingly.
        mLauncher.bindPackagesUpdated();
    }
}
           

LauncherAppWidgetHostView.java

package com.android.launcher2;

import android.appwidget.AppWidgetHostView;
import android.content.ComponentName;
import android.content.ContentValues;

/**
 * Represents a widget (either instantiated or about to be) in the Launcher.
 */
class LauncherAppWidgetInfo extends ItemInfo {

    /**
     * Indicates that the widget hasn't been instantiated yet.
     */
    static final int NO_ID = -;

    /**
     * Identifier for this widget when talking with
     * {@link android.appwidget.AppWidgetManager} for updates.
     */
    int appWidgetId = NO_ID;

    ComponentName providerName;

    // TODO: Are these necessary here?
    int minWidth = -;
    int minHeight = -;

    private boolean mHasNotifiedInitialWidgetSizeChanged;

    /**
     * View that holds this widget after it's been created.  This view isn't created
     * until Launcher knows it's needed.
     */
    AppWidgetHostView hostView = null;

    LauncherAppWidgetInfo(int appWidgetId, ComponentName providerName) {
        itemType = LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET;
        this.appWidgetId = appWidgetId;
        this.providerName = providerName;

        // Since the widget isn't instantiated yet, we don't know these values. Set them to -1
        // to indicate that they should be calculated based on the layout and minWidth/minHeight
        spanX = -;
        spanY = -;
    }

    @Override
    void onAddToDatabase(ContentValues values) {
        super.onAddToDatabase(values);
        values.put(LauncherSettings.Favorites.APPWIDGET_ID, appWidgetId);
    }

    /**
     * When we bind the widget, we should notify the widget that the size has changed if we have not
     * done so already (only really for default workspace widgets).
     */
    void onBindAppWidget(Launcher launcher) {
        if (!mHasNotifiedInitialWidgetSizeChanged) {
            notifyWidgetSizeChanged(launcher);
        }
    }

    /**
     * Trigger an update callback to the widget to notify it that its size has changed.
     */
    void notifyWidgetSizeChanged(Launcher launcher) {
        AppWidgetResizeFrame.updateWidgetSizeRanges(hostView, launcher, spanX, spanY);
        mHasNotifiedInitialWidgetSizeChanged = true;
    }

    @Override
    public String toString() {
        return "AppWidget(id=" + Integer.toString(appWidgetId) + ")";
    }

    @Override
    void unbind() {
        super.unbind();
        hostView = null;
    }
}