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使用AlarmManager定期执行工作

时间:2015-07-31 01:09:56      阅读:246      评论:0      收藏:0      [点我收藏+]

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新建一个Service来模拟后台执行的程序,PollingService.java:

package com.ryantang.rtpollingdemo;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
/**
 * Polling service
 * @Author Ryan
 * @Create 2013-7-13 涓婂崍10:18:44
 */
public class PollingService extends Service {

    public static final String ACTION = "com.ryantang.service.PollingService";
    
    private Notification mNotification;
    private NotificationManager mManager;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        initNotifiManager();
    }
    
    @Override
    public void onStart(Intent intent, int startId) {
        new PollingThread().start();
    }
    //初始化通知栏配置
    private void initNotifiManager() {
        mManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        int icon = R.drawable.ic_launcher;
        mNotification = new Notification();
        mNotification.icon = icon;
        mNotification.tickerText = "New Message";
        mNotification.defaults |= Notification.DEFAULT_SOUND;
        mNotification.flags = Notification.FLAG_AUTO_CANCEL;
    }
    //弹出Notification
    private void showNotification() {
        mNotification.when = System.currentTimeMillis();
        //Navigator to the new activity when click the notification title
        Intent i = new Intent(this, MessageActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, i,
                Intent.FLAG_ACTIVITY_NEW_TASK);
        mNotification.setLatestEventInfo(this,
                getResources().getString(R.string.app_name), "You have new message!", pendingIntent);
        mManager.notify(0, mNotification);
    }

    /**
     * Polling thread
     * 模拟向Server轮询的异步线程
     * @Author Ryan
     * @Create 2013-7-13 涓婂崍10:18:34
     */
    int count = 0;
    class PollingThread extends Thread {
        @Override
        public void run() {
            System.out.println("Polling...");
            count ++;
            //当计数能被5整除时弹出通知
            if (count % 5 == 0) {
                showNotification();
                System.out.println("New message!");
            }
        }
    }
    
    @Override
    public void onDestroy() {
        super.onDestroy();
        System.out.println("Service:onDestroy");
    }

}

别望了在AndroidManifest.xml中注册Service:

<service android:name="com.ryantang.rtpollingdemo.PollingService">
            <intent-filter>
                <action android:name="com.ryantang.service.PollingService"/>
            </intent-filter>
        </service>

当计数能被5整除时弹出通知,点击通知后进入MessageActivity.java:

技术分享
package com.ryantang.rtpollingdemo;

import android.app.Activity;
import android.app.NotificationManager;
import android.content.Context;
import android.os.Bundle;

public class MessageActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_message);
        System.out.println("新的activity");
        NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        
        manager.cancelAll();
    }
}
View Code

使用AlarmManager封装已给PollingUtils.java来执行Service的启动和停止,PollingUtils.java:

package com.ryantang.rtpollingdemo;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.SystemClock;
/**
 * Polling Tools
 * @Author Ryan
 * @Create 2013-7-13 涓婂崍10:14:43
 */
public class PollingUtils {

    /**开启轮询服务
     * @param context
     * @param seconds  定期执行的时间间隔
     * @param cls
     * @param action
     */ 
    public static void startPollingService(Context context, int seconds, Class<?> cls,String action) {
        //获取AlarmManager系统服务
        AlarmManager manager = (AlarmManager) context
                .getSystemService(Context.ALARM_SERVICE);
        //包装需要执行Service的Intent
        Intent intent = new Intent(context, cls);
        intent.setAction(action);
        PendingIntent pendingIntent = PendingIntent.getService(context, 0,
                intent, PendingIntent.FLAG_UPDATE_CURRENT);
        //触发服务的起始时间
        long triggerAtTime = SystemClock.elapsedRealtime();
        //使用AlarmManager的setRepeating方法设置定期执行时间间隔(seconds秒)和需要执行的Service
        manager.setRepeating(AlarmManager.ELAPSED_REALTIME, triggerAtTime,
                seconds * 1000, pendingIntent);
    }

    /**
     * 停止轮询服务
     * @param context
     * @param cls
     * @param action
     */
    public static void stopPollingService(Context context, Class<?> cls,String action) {
        //获取AlarmManager系统服务
        AlarmManager manager = (AlarmManager) context
                .getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(context, cls);
        intent.setAction(action);
        PendingIntent pendingIntent = PendingIntent.getService(context, 0,
                intent, PendingIntent.FLAG_UPDATE_CURRENT);
        //取消正在执行的服务
        manager.cancel(pendingIntent);
    }
}

最后在主程序中执行,MainActivity.java:

package com.ryantang.rtpollingdemo;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Start polling service
        System.out.println("Start polling service...");
        PollingUtils.startPollingService(this, 30, PollingService.class,
                PollingService.ACTION);// PollingService.ACTION与AndroidManifest.xml一一对应
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // Stop polling service
        System.out.println("Stop polling service...");
        PollingUtils.stopPollingService(this, PollingService.class,
                PollingService.ACTION);
    }

}

Android之AlarmManager(全局定时器/闹钟)指定时长或以周期形式执行某项操作

(1)在指定时长后执行某项操作

 

//操作:发送一个广播,广播接收后Toast提示定时操作完成
Intent intent =new Intent(Main.this, alarmreceiver.class);
intent.setAction("short");
PendingIntent sender=
PendingIntent.getBroadcast(Main.this, 0, intent, 0);

//设定一个五秒后的时间
Calendar calendar=Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 5);

AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);
alarm.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);
//或者以下面方式简化
//alarm.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()+5*1000, sender);
//注意:receiver记得在manifest.xml注册,使用的是静态的广播消息机制
public static class alarmreceiver extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
if(intent.getAction().equals("short")){
      Toast.makeText(context, "short alarm", Toast.LENGTH_LONG).show();
}else{
       Toast.makeText(context, "repeating alarm",Toast.LENGTH_LONG).show();
    }
  }
}
<receiver android:name="" >
        <intent-filter >
            <action android:name="short"><action />
        </intent-filter>
</receiver>

AlarmManager类型如下:

AlarmManager.RTC,硬件闹钟,不唤醒手机(也可能是其它设备)休眠;当手机休眠时不发射闹钟。

AlarmManager.RTC_WAKEUP,硬件闹钟,当闹钟发射时唤醒手机休眠;

AlarmManager.ELAPSED_REALTIME,真实时间流逝闹钟,不唤醒手机休眠;在指定的延时过后,发送广播,但不唤醒设备。

AlarmManager.ELAPSED_REALTIME_WAKEUP,真实时间流逝闹钟,当闹钟发射时唤醒手机休眠; 

RTC闹钟和ELAPSED_REALTIME最大的差别就是前者可以通过修改手机时间触发闹钟事件,后者要通过真实时间的流逝,即使在休眠状态,时间也会被计算。

(2)周期性的执行某项操作

Intent intent =new Intent(Main.this, alarmreceiver.class);
intent.setAction("repeating");
PendingIntent sender=PendingIntent
.getBroadcast(Main.this, 0, intent, 0);
//开始时间
long firstime=SystemClock.elapsedRealtime();
AlarmManager am=(AlarmManager)getSystemService(ALARM_SERVICE);
 //5秒一个周期,不停的发送广播
am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, firstime, 5*1000, sender);

AlarmManager的setRepeating()相当于Timer的Schedule(task,delay,peroid);有点差异的地方时Timer这个方法是指定延迟多长时间以后开始周期性的执行task;

AlarmManager的取消:(其中需要注意的是取消的Intent必须与启动Intent保持绝对一致才能支持取消AlarmManager)

Intent intent =new Intent(Main.this, alarmreceiver.class);
intent.setAction("repeating");
PendingIntent sender=PendingIntent
.getBroadcast(Main.this, 0, intent, 0);
AlarmManager alarm=(AlarmManager)getSystemService(ALARM_SERVICE);
alarm.cancel(sender);

使用AlarmManager定期执行工作

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原文地址:http://www.cnblogs.com/sowhat4999/p/4690850.html

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