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