<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="hello" />    <Button        android:id="@+id/btnStart"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="通知" />    <Button        android:id="@+id/btnStop"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="清除" /></LinearLayout>

package com.example.notificationservice;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity implements OnClickListener {    private Button btnStart;    private Button btnStop;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView() {        btnStart = (Button) findViewById(R.id.btnStart);        btnStop = (Button) findViewById(R.id.btnStop);        btnStart.setOnClickListener(this);        btnStop.setOnClickListener(this);    }    @Override    public void onClick(View v) {        int id = v.getId();        if (id == R.id.btnStart) {            // 启动Service            Intent intent = new Intent();            intent.setAction("ymw.MY_SERVICE");            startService(intent);        }        if (id == R.id.btnStop) {            // 关闭Service            Intent intent = new Intent();            intent.setAction("ymw.MY_SERVICE");            stopService(intent);        }    }    @Override    public void onBackPressed() {        System.exit(0);        super.onBackPressed();    }}

package com.example.notificationservice;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.app.Service;import android.content.Context;import android.content.Intent;import android.os.IBinder;public class NotificationService extends Service {    // 获取消息线程    private MessageThread messageThread = null;    // 点击查看    private Intent messageIntent = null;    private PendingIntent messagePendingIntent = null;    // 通知栏消息    private int messageNotificationID = 1000;    private Notification messageNotification = null;    private NotificationManager messageNotificatioManager = null;    public IBinder onBind(Intent intent) {        return null;    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        // 初始化        messageNotification = new Notification();        messageNotification.icon = R.drawable.ic_launcher;        messageNotification.tickerText = "新消息";        messageNotification.defaults = Notification.DEFAULT_SOUND;        messageNotificatioManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);        messageIntent = new Intent(this, MainActivity.class);        messagePendingIntent = PendingIntent.getActivity(this, 0,                messageIntent, 0);        // 开启线程        messageThread = new MessageThread();        messageThread.isRunning = true;        messageThread.start();        return super.onStartCommand(intent, flags, startId);    }    /**     * 从服务器端获取消息     *      */    class MessageThread extends Thread {        // 设置是否循环推送        public boolean isRunning = true;        public void run() {            // while (isRunning) {            try {                // 间隔时间                Thread.sleep(1000);                // 获取服务器消息                String serverMessage = getServerMessage();                if (serverMessage != null && !"".equals(serverMessage)) {                    // 更新通知栏                    messageNotification.setLatestEventInfo(                            getApplicationContext(), "新消息", "您有新消息。"                                    + serverMessage, messagePendingIntent);                    messageNotificatioManager.notify(messageNotificationID,                            messageNotification);                    // 每次通知完，通知ID递增一下，避免消息覆盖掉                    messageNotificationID++;                }            } catch (InterruptedException e) {                e.printStackTrace();            }            // }        }    }    @Override    public void onDestroy() {        // System.exit(0);        messageThread.isRunning = false;        super.onDestroy();    }    /**     * 模拟发送消息     *      * @return 返回服务器要推送的消息，否则如果为空的话，不推送     */    public String getServerMessage() {        return "NEWS!";    }}