Android AppWidget组件

res/xml/example_appwidget_info.xml  定义了AppWidget必要属性

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider
 	xmlns:android="http://schemas.android.com/apk/res/android"
  	android:minWidth="160dp"
  	android:minHeight="72dp"
  	android:updatePeriodMillis="86400000"
  	android:initialLayout="@layout/appwidget_provider_layout">
</appwidget-provider>

res/xml/appwidget_provider_layout.xml  AppWidget的控件布局文件

<?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:text="WidgetTextView" 
		android:textColor="@android:color/black"
		android:id="@+id/myWidgetTextView"
		android:layout_width="wrap_content" 
		android:layout_height="wrap_content"/>
</LinearLayout>

ExampleAppWidgetProvider.java

package com.zeph.android.widget;

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

public class ExampleAppWidgetProvider extends AppWidgetProvider {

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

	@Override
	public void onDisabled(Context context) {
		super.onDisabled(context);
	}

	@Override
	public void onEnabled(Context context) {
		super.onEnabled(context);
	}

	@Override
	public void onReceive(Context context, Intent intent) {
		super.onReceive(context, intent);
	}

	@Override
	public void onUpdate(Context context, AppWidgetManager appWidgetManager,
			int[] appWidgetIds) {
		final int N = appWidgetIds.length;
		//循环的更新所有与这个Provider有关的AppWidget
		for (int i = 0; i < N; i++) {
			int appWidgetId = appWidgetIds[i];
			// 设置Widget被点击之后，启动的Activity
			Intent intent = new Intent(context, WidgetActivity.class);
			PendingIntent pendingIntent = PendingIntent.getActivity(context, 0,
					intent, 0);
			RemoteViews views = new RemoteViews(context.getPackageName(),
					R.layout.appwidget_provider_layout);
			views.setOnClickPendingIntent(R.id.myWidgetTextView, pendingIntent);
			appWidgetManager.updateAppWidget(appWidgetId, views);
		}
	}

}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.zeph.android.widget"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="4" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:label="@string/app_name" android:name="WidgetActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name="ExampleAppWidgetProvider">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE"></action>
            </intent-filter>
            <meta-data android:name="android.appwidget.provider" 
            android:resource="@xml/example_appwidget_info">
            </meta-data>
        </receiver>

    </application>
</manifest>

AppWidgetProvider继承自BroadcastReceiver

所以使用receiver注册AppWidgetProvider