ANDROID_MARS学习笔记_S02_006_APPWIDGET3_AppWidget发送广播及更新AppWidget

一、简介

二、代码
1.xml
(1)example_appwidget.xml

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     >
 <TextView
     android:id="@+id/widgetTextId"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="firstWidgetText"
     android:background="#000000"
     />
 <ImageView
     android:id="@+id/imageId"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:src="@drawable/xiao"
     />
 <Button
     android:id="@+id/widgetButtonId"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="测试用按钮"
     />
 </LinearLayout>

(2)AndroidManifest.xml

增加action类型以接收广播

  <receiver android:name="ExampleAppWidgetProvider">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
                 <action android:name="tony.appwidget03.UPDATE_APP_WIDGET"/>
             </intent-filter>
             <meta-data android:name="android.appwidget.provider" android:resource="@xml/example_appwidget_info"/>

         </receiver>

2.java
(1)ExampleAppWidgetProvider.java

 package com.appwidget;

 import android.app.PendingIntent;
 import android.appwidget.AppWidgetManager;
 import android.appwidget.AppWidgetProvider;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.widget.RemoteViews;

 public class ExampleAppWidgetProvider extends AppWidgetProvider{

     //定义一个常量字符串，该常量用于命名Action
     private static final String UPDATE_ACTION = "tony.appwidget03.UPDATE_APP_WIDGET";

     // 使按钮被click时发送广播
     @Override
     public void onUpdate(Context context, AppWidgetManager appWidgetManager,
             int[] appWidgetIds) {
         //创建一个Intent对象
         Intent intent = new Intent();
         //为Intent对象设置Action
         intent.setAction(UPDATE_ACTION);
         //使用getBroadcast方法，得到一个PendingIntent对象，当该对象执行时，会发送一个广播
         PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
         RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.example_appwidget);
         remoteViews.setOnClickPendingIntent(R.id.widgetButtonId, pendingIntent);
         appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);
     }

     /**
      * 接收广播，如果查UPDATE_ACTION，则更新文本和图片
      * @param context
      * @param intent
      */
     @Override
     public void onReceive(Context context, Intent intent) {
         System.out.println(UPDATE_ACTION + "----------->" + intent.getAction());
         if(UPDATE_ACTION.equals(intent.getAction())) {
             //获取代表此appwidget控件的remoteviews
             RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.example_appwidget);
             //用remoteviews设置文本、图片
             remoteViews.setImageViewResource(R.id.imageId, R.drawable.ku);
             remoteViews.setTextViewText(R.id.widgetTextId, "更新的文本");
             AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
             ComponentName componentName = new ComponentName(context, ExampleAppWidgetProvider.class);
             appWidgetManager.updateAppWidget(componentName, remoteViews);
         } else {
             super.onReceive(context, intent);
         }
     }

     /*@Override
     public void onUpdate(Context context, AppWidgetManager appWidgetManager,
             int[] appWidgetIds) { //每个widget都有id
         System.out.println("onupdate");
         for(int i = 0; i < appWidgetIds.length ; i++) {
             System.out.println(appWidgetIds[i]);
             //创建一个Intent对象
             Intent intent = new Intent(context, TargetActivity.class);
             //创建一个PendingIntent
             PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
             RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.example_appwidget);
             //为按钮绑定事件处理器
             //第一个参数用来指定被绑定处理器的控件的ID
             //第二个参数用来指定当事件发生时，哪个PendingIntent将会被执行
             remoteViews.setOnClickPendingIntent(R.id.widgetButtonId, pendingIntent);
             //更新AppWidget
             //第一个参数用于指定被更新AppWidget的ID
             appWidgetManager.updateAppWidget(appWidgetIds[i], remoteViews);
         }
         super.onUpdate(context, appWidgetManager, appWidgetIds);
     }*/

     @Override
     public void onDeleted(Context context, int[] appWidgetIds) {
         System.out.println("onDeleted");
         super.onDeleted(context, appWidgetIds);
     }

     @Override
     public void onDisabled(Context context) {
         System.out.println("onDisabled");
         super.onDisabled(context);
     }

     @Override
     public void onEnabled(Context context) {
         System.out.println("onEnabled");
         super.onEnabled(context);
     }

 }

(2).java