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 Android教程網 >> Android技術 >> 關於Android編程 >> Android 通過Service單獨進程模仿離線推送 Server Push

Android 通過Service單獨進程模仿離線推送 Server Push

編輯:關於Android編程

概述:

         首先簡單闡述一下我對於消息推送的理解,這裡拿QQ來舉例吧,當我們手機端的QQ離線了,並且退出了QQ應用,但是這時候如果別人給我們發了信息,我們沒有上線。服務器會將發送者發送的信息推送過來然後我們發布通知來顯示通知我們的用戶

 

 

原理簡單闡述:

         通過以上概述,我們基本了解我們需要一個獨立進程的後台服務,在AndroidManifest

.xml中注冊Service時,有一個android:process屬性這個屬性有2種情況,即為.和:兩種,其中.代表為此服務開啟一個全局的獨立進程,如果以:開頭則為此服務開啟一個為此應用私有的獨立進程

 

 

編碼實現:


ServerPushService文件:

[java]
import android.app.Notification; 
import android.app.NotificationManager; 
import android.app.PendingIntent; 
import android.app.Service; 
import android.content.Intent; 
import android.os.IBinder; 
 
public class ServerPushService extends Service{ 
    //獲取消息線程  
    private MessageThread messageThread = null; 
    //點擊查看  
    private Intent messageIntent = null; 
    private PendingIntent messagePendingIntent = null; 
    //通知欄消息  
    private int messageNotificationID = 1000; 
    private Notification messageNotification = null; 
    private NotificationManager messageNotificationManager = null; 
    @Override 
    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;  //通知圖片  
        messageNotification.tickerText = "新消息";         //通知標題  
        messageNotification.defaults = Notification.DEFAULT_SOUND; 
        messageNotificationManager = (NotificationManager) getSystemService(this.NOTIFICATION_SERVICE); 
        //點擊查看  
        messageIntent = new Intent(this,MessageActivity.class); 
        messagePendingIntent = PendingIntent.getActivity(this, 0, messageIntent, 0); 
        //開啟線程  
        MessageThread thread = new MessageThread(); 
        thread.isRunning = true; 
        thread.start(); 
        return super.onStartCommand(intent, flags, startId); 
    } 
 
    /***
     * 從服務端獲取消息
     * @author zhanglei
     *
     */ 
    class MessageThread extends Thread{ 
        //運行狀態  
        public boolean isRunning = true; 
        @Override 
        public void run() { 
            while(isRunning){ 
                try { 
                    //休息10秒  
                    Thread.sleep(10000); 
                    if(getServerMessage().equals("yes")){ 
                        //設置消息內容和標題  
                        messageNotification.setLatestEventInfo(ServerPushService.this, "您有新消息!", "這是一條新的測試消息", messagePendingIntent); 
                        //發布消息  
                        messageNotificationManager.notify(messageNotificationID, messageNotification); 
                        //避免覆蓋消息,采取ID自增  
                        messageNotificationID++; 
                    } 
                } catch (Exception e) { 
                    e.printStackTrace(); 
                } 
            }    
        } 
    } 
    /***
     * 模擬了服務端的消息。實際應用中應該去服務器拿到message
     * @return
     */ 
    public String getServerMessage(){ 
        return "yes"; 
    } 

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class ServerPushService extends Service{
 //獲取消息線程
 private MessageThread messageThread = null;
 //點擊查看
 private Intent messageIntent = null;
 private PendingIntent messagePendingIntent = null;
 //通知欄消息
 private int messageNotificationID = 1000;
 private Notification messageNotification = null;
 private NotificationManager messageNotificationManager = null;
 @Override
 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; //通知圖片
  messageNotification.tickerText = "新消息";   //通知標題
  messageNotification.defaults = Notification.DEFAULT_SOUND;
  messageNotificationManager = (NotificationManager) getSystemService(this.NOTIFICATION_SERVICE);
  //點擊查看
  messageIntent = new Intent(this,MessageActivity.class);
  messagePendingIntent = PendingIntent.getActivity(this, 0, messageIntent, 0);
  //開啟線程
  MessageThread thread = new MessageThread();
  thread.isRunning = true;
  thread.start();
  return super.onStartCommand(intent, flags, startId);
 }

 /***
  * 從服務端獲取消息
  * @author zhanglei
  *
  */
 class MessageThread extends Thread{
  //運行狀態
  public boolean isRunning = true;
  @Override
  public void run() {
   while(isRunning){
    try {
     //休息10秒
     Thread.sleep(10000);
     if(getServerMessage().equals("yes")){
      //設置消息內容和標題
      messageNotification.setLatestEventInfo(ServerPushService.this, "您有新消息!", "這是一條新的測試消息", messagePendingIntent);
      //發布消息
      messageNotificationManager.notify(messageNotificationID, messageNotification);
      //避免覆蓋消息,采取ID自增
      messageNotificationID++;
     }
    } catch (Exception e) {
     e.printStackTrace();
    }
   } 
  }
 }
 /***
  * 模擬了服務端的消息。實際應用中應該去服務器拿到message
  * @return
  */
 public String getServerMessage(){
  return "yes";
 }
}


注冊該service在一個單獨的進程中

[html]
<!-- 為此應用私有的獨立進程 --> 
        <service  
                android:name="com.jay.serverpush.ServerPushService" 
                android:process=":message" 
            > 
</service> 

<!-- 為此應用私有的獨立進程 -->
        <service
             android:name="com.jay.serverpush.ServerPushService"
             android:process=":message"
            >
</service>


說明:該文件編寫了一個service用於後台運行,在manifest裡面將該service聲明成progress為:開頭的,這樣在一個單獨的進程裡面運行,以實現在程序關閉之後達到進程不關閉的目的以此來實現離線推送的目的,編碼中的注釋很明確,掃描服務器、判斷邏輯發布通知等,注釋很明確在此不在闡述

 


開啟服務的方式:

[java]
Override 
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
        this.startService(new Intent(this,ServerPushService.class)); 
    } 
 
 
this.startService(new Intent(this,ServerPushService.class)); 

@Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  this.startService(new Intent(this,ServerPushService.class));
 }


this.startService(new Intent(this,ServerPushService.class));


通過這句話在第一次進入oncreate方法就開啟了單獨進程的服務

 

 

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