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);
    }
}