ANDROID_MARS学习笔记_S02_006_APPWIDGET2_PendingIntent及RemoteViews实现widget绑定点击事件

一、代码流程

1.ExampleAppWidgetProvider的onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)，其中appWidgetIds表示widget的id,

在这个方法里，通过for遍历appWidgetIds，用PendingIntent和RemoteViews给widget的按钮绑定click事件，用appWidgetManager.updateAppWidget(appWidgetIds[i], remoteViews)更新widget

二、PendingIntent及RemoteViews简介

三、代码
1.xml
(1)AndroidManifest.xml

添加activity

 <activity android:name=".TargetActivity" android:label="TargetActivityLabel"/>

(2)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"
     />
 <Button
     android:id="@+id/widgetButtonId"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="测试用按钮"
     />
 </LinearLayout>

2.java
(1)ExampleAppWidgetProvider.java的update

 @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);
     }

(2)TargetActivity.java

 public class TargetActivity extends Activity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         System.out.println("TargetActivity onCreate()----->");
         super.onCreate(savedInstanceState);
     }
 }