AppWidget应用（四）---PendingIntent 之 getService

下面给出一个appWidget中Service通讯的例子

创建一个Service子类，用来处理appWidget发送过来的命令

package com.example.service;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class myService extends Service{

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		// TODO Auto-generated method stub
		System.out.println("--------------flags--------->" + flags);
		System.out.println("--------------startId--------->" + startId);
		System.out.println("----------------------->onStartCommand");
		String value = intent.getStringExtra("hello");
		System.out.println("value = " + value);
		return super.onStartCommand(intent, flags, startId);
	}

}

为按钮绑定监听器，当点击按钮时发送一个Service

/**
	 * 到达指定的更新时间或者当用户向桌面添加AppWidget时被调用
	 */
	@Override
	public void onUpdate(Context context, AppWidgetManager appWidgetManager,
			int[] appWidgetIds) {
		System.out.println("----------------onUpdate");
		// TODO Auto-generated method stub
		// 创建一个Intent对象
		Intent intent = new Intent(context, myService.class);
		intent.putExtra("hello", "我是一个Service");
		// 这里是getActivity，当然也可以是broadcastReceiver等   发送一个广播消息
		PendingIntent pendingIntent = PendingIntent.getService(context, 0,
				intent, 0);
		RemoteViews remoteViews = new RemoteViews(context.getPackageName(),
				R.layout.appwidgetlayout);

		//为按钮绑定监听器
		remoteViews.setOnClickPendingIntent(R.id.btnSend, pendingIntent);

		// 更新Appwidget
		appWidgetManager.updateAppWidget(appWidgetIds, remoteViews);
	}

当然还要在AndroidMainfest上对Service进行注册

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.appwidgetdemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.appwidgetdemo.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver android:name="com.example.appwidgetdemo.appWidgetActivity" >
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" >
                </action>
            </intent-filter>

            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/appwidget01" />

        </receiver>
        
        <service android:name="com.example.service.myService" >
        </service>
    </application>

</manifest>

启动后的效果

当点击按钮时会在控制台上打印：我是一个Service

当然你可以处理你感兴趣的事

样例代码

点击打开链接