StackView Widget示例程序（StackWidgetService.java）

StackWidgetService.java文件

原文地址：http://developer.android.com/resources/samples/StackWidget/src/com/example/android/stackwidget/StackWidgetService.html

The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...

/* * Copyright (C) 2011 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.example.android.stackwidget;import java.util.ArrayList;import java.util.List;import android.appwidget.AppWidgetManager;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.widget.RemoteViews;import android.widget.RemoteViewsService;public class StackWidgetService extends RemoteViewsService {    @Override    public RemoteViewsFactory onGetViewFactory(Intent intent) {        return new StackRemoteViewsFactory(this.getApplicationContext(), intent);    }}class StackRemoteViewsFactory implements RemoteViewsService.RemoteViewsFactory {    private static final int mCount = 10;    private List<WidgetItem> mWidgetItems = new ArrayList<WidgetItem>();    private Context mContext;    private int mAppWidgetId;    public StackRemoteViewsFactory(Context context, Intent intent) {        mContext = context;        mAppWidgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID,                AppWidgetManager.INVALID_APPWIDGET_ID);    }    public void onCreate() {        // In onCreate() you setup any connections / cursors to your data source. Heavy lifting,        // for example downloading or creating content etc, should be deferred to onDataSetChanged()        // or getViewAt(). Taking more than 20 seconds in this call will result in an ANR.        for (int i = 0; i < mCount; i++) {            mWidgetItems.add(new WidgetItem(i + "!"));        }        // We sleep for 3 seconds here to show how the empty view appears in the interim.        // The empty view is set in the StackWidgetProvider and should be a sibling of the        // collection view.        try {            Thread.sleep(3000);        } catch (InterruptedException e) {            e.printStackTrace();        }    }    public void onDestroy() {        // In onDestroy() you should tear down anything that was setup for your data source,        // eg. cursors, connections, etc.        mWidgetItems.clear();    }    public int getCount() {        return mCount;    }    public RemoteViews getViewAt(int position) {        // position will always range from 0 to getCount() - 1.        // We construct a remote views item based on our widget item xml file, and set the        // text based on the position.        RemoteViews rv = new RemoteViews(mContext.getPackageName(), R.layout.widget_item);        rv.setTextViewText(R.id.widget_item, mWidgetItems.get(position).text);        // Next, we set a fill-intent which will be used to fill-in the pending intent template        // which is set on the collection view in StackWidgetProvider.        Bundle extras = new Bundle();        extras.putInt(StackWidgetProvider.EXTRA_ITEM, position);        Intent fillInIntent = new Intent();        fillInIntent.putExtras(extras);        rv.setOnClickFillInIntent(R.id.widget_item, fillInIntent);        // You can do heaving lifting in here, synchronously. For example, if you need to        // process an image, fetch something from the network, etc., it is ok to do it here,        // synchronously. A loading view will show up in lieu of the actual contents in the        // interim.        try {            System.out.println("Loading view " + position);            Thread.sleep(500);        } catch (InterruptedException e) {            e.printStackTrace();        }        // Return the remote views object.        return rv;    }    public RemoteViews getLoadingView() {        // You can create a custom loading view (for instance when getViewAt() is slow.) If you        // return null here, you will get the default loading view.        return null;    }    public int getViewTypeCount() {        return 1;    }    public long getItemId(int position) {        return position;    }    public boolean hasStableIds() {        return true;    }    public void onDataSetChanged() {        // This is triggered when you call AppWidgetManager notifyAppWidgetViewDataChanged        // on the collection view corresponding to this factory. You can do heaving lifting in        // here, synchronously. For example, if you need to process an image, fetch something        // from the network, etc., it is ok to do it here, synchronously. The widget will remain        // in its current state while work is being done here, so you don't need to worry about        // locking up the widget.    }}