Android 后台Service : 向服务器发送心跳包

public class HeartbeatService extends Service implements Runnable  
{  
    private Thread          mThread;  
    public int              count           = 0;  
    private boolean         isTip           = true;  
    private static String   mRestMsg;  
    private static String   KEY_REST_MSG    = "KEY_REST_MSG";  
  
    @Override  
    public void run()  
    {  
        while (true)  
        {  
            try  
            {  
                if (count > 1)  
                {  
                    Log.i("@qi", "offline");  
                    count = 1;  
                    if (isTip)  
                    {  
                        //判断应用是否在运行   
                        ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);  
                        List<RunningTaskInfo> list = am.getRunningTasks(3);  
                        for (RunningTaskInfo info : list)  
                        {  
                            if (info.topActivity.getPackageName().equals("org.yhn.demo"))  
                            {  
                                //通知应用，显示提示“连接不到服务器”   
                                Intent intent = new Intent("org.yhn.demo");  
                                intent.putExtra("msg", true);  
                                sendBroadcast(intent);  
                                break;  
                            }  
                        }  
  
                        isTip = false;  
                    }  
                }  
                if (mRestMsg != "" && mRestMsg != null)  
                {  
                    //向服务器发送心跳包   
                    sendHeartbeatPackage(mRestMsg);  
                    count += 1;  
                }  
  
                Thread.sleep(1000 * 3);  
            }  
            catch (InterruptedException e)  
            {  
                e.printStackTrace();  
            }  
        }  
    }  
  
    private void sendHeartbeatPackage(String msg)  
    {  
        HttpGet httpGet = new HttpGet(msg);  
        DefaultHttpClient httpClient = new DefaultHttpClient();  
        // 发送请求   
        HttpResponse httpResponse = null;  
        try  
        {  
            httpResponse = httpClient.execute(httpGet);  
        }  
        catch (Exception e)  
        {  
            e.printStackTrace();  
        }  
        if (httpResponse == null)  
        {  
            return;  
        }  
  
        // 处理返回结果   
        final int responseCode = httpResponse.getStatusLine().getStatusCode();  
        if (responseCode == HttpStatus.SC_OK)  
        {  
            //只要服务器有回应就OK   
            count = 0;  
            isTip = true;  
        }  
        else  
        {  
            Log.i("@qi", "responseCode " + responseCode);  
        }  
  
    }  
  
    @Override  
    public IBinder onBind(Intent intent)  
    {  
        return null;  
    }  
  
  
    @Override  
    public void onCreate()  
    {  
        super.onCreate();  
    }  
  
  
  
    @Override  
    public void onDestroy()  
    {  
        super.onDestroy();  
    }  
  
    public void onStart(Intent intent, int startId)  
    {  
        Log.i("@qi", "service onStart");  
        //从本地读取服务器的URL，如果没有就用传进来的URL   
        mRestMsg = getRestMsg();  
        if (mRestMsg == null || mRestMsg == "")  
        {  
            mRestMsg = intent.getExtras().getString("url");  
        }  
        setRestMsg(mRestMsg);  
  
        mThread = new Thread(this);  
        mThread.start();  
        count = 0;  
  
        super.onStart(intent, startId);  
    }  
  
    public String getRestMsg()  
    {  
        SharedPreferences prefer = getSharedPreferences("settings.data", Context.MODE_PRIVATE);  
        Log.i("@qi", "getRestMsg() " + prefer.getString(KEY_REST_MSG, ""));  
        return prefer.getString(KEY_REST_MSG, "");  
    }  
  
    public void setRestMsg(String restMsg)  
    {  
        SharedPreferences prefer = getSharedPreferences("settings.data", Context.MODE_PRIVATE);  
        SharedPreferences.Editor editor = prefer.edit();  
        editor.putString(KEY_REST_MSG, restMsg);  
        editor.commit();  
    }  
  
}  
 
public class HeartbeatService extends Service implements Runnable
{
private Thread mThread;
public int count = 0;
private boolean isTip = true;
private static String mRestMsg;
private static String KEY_REST_MSG = "KEY_REST_MSG";
 
@Override
public void run()
{
while (true)
{
try
{
if (count > 1)
{
Log.i("@qi", "offline");
count = 1;
if (isTip)
{
//判断应用是否在运行
ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
List<RunningTaskInfo> list = am.getRunningTasks(3);
for (RunningTaskInfo info : list)
{
if (info.topActivity.getPackageName().equals("org.yhn.demo"))
{
//通知应用，显示提示“连接不到服务器”
Intent intent = new Intent("org.yhn.demo");
intent.putExtra("msg", true);
sendBroadcast(intent);
break;
}
}
 
isTip = false;
}
}
if (mRestMsg != "" && mRestMsg != null)
{
//向服务器发送心跳包
sendHeartbeatPackage(mRestMsg);
count += 1;
}
 
Thread.sleep(1000 * 3);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}
}
 
private void sendHeartbeatPackage(String msg)
{
HttpGet httpGet = new HttpGet(msg);
DefaultHttpClient httpClient = new DefaultHttpClient();
// 发送请求
HttpResponse httpResponse = null;
try
{
httpResponse = httpClient.execute(httpGet);
}
catch (Exception e)
{
e.printStackTrace();
}
if (httpResponse == null)
{
return;
}
 
// 处理返回结果
final int responseCode = httpResponse.getStatusLine().getStatusCode();
if (responseCode == HttpStatus.SC_OK)
{
//只要服务器有回应就OK
count = 0;
isTip = true;
}
else
{
Log.i("@qi", "responseCode " + responseCode);
}
 
}
 
@Override
public IBinder onBind(Intent intent)
{
return null;
}
 
 
@Override
public void onCreate()
{
super.onCreate();
}
 
 
 
@Override
public void onDestroy()
{
super.onDestroy();
}
 
public void onStart(Intent intent, int startId)
{
Log.i("@qi", "service onStart");
//从本地读取服务器的URL，如果没有就用传进来的URL
mRestMsg = getRestMsg();
if (mRestMsg == null || mRestMsg == "")
{
mRestMsg = intent.getExtras().getString("url");
}
setRestMsg(mRestMsg);
 
mThread = new Thread(this);
mThread.start();
count = 0;
 
super.onStart(intent, startId);
}
 
public String getRestMsg()
{
SharedPreferences prefer = getSharedPreferences("settings.data", Context.MODE_PRIVATE);
Log.i("@qi", "getRestMsg() " + prefer.getString(KEY_REST_MSG, ""));
return prefer.getString(KEY_REST_MSG, "");
}
 
public void setRestMsg(String restMsg)
{
SharedPreferences prefer = getSharedPreferences("settings.data", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = prefer.edit();
editor.putString(KEY_REST_MSG, restMsg);
editor.commit();
}
 
}
 
 
启动Service：
 
 
[java]  
Intent serviceIntent = new Intent("HeartbeatService");  
serviceIntent.putExtra("url",url);  
startService(serviceIntent);  
 
Intent serviceIntent = new Intent("HeartbeatService");
serviceIntent.putExtra("url",url);
startService(serviceIntent);
 
 
 
 
最后别忘了注册Server和GET_TASKS
 
 
[html]  
<service  
            android:name=".demo.HeartbeatService"  
            android:label="QServer"  
            android:persistent="true" >  
            <intent-filter>  
                <action android:name="HeartbeatService" />  
            </intent-filter>  
        </service>  
 
<service
            android:name=".demo.HeartbeatService"
            android:label="QServer"
            android:persistent="true" >
            <intent-filter>
                <action android:name="HeartbeatService" />
            </intent-filter>
        </service>[html] view plaincopyprint?
<uses-permission android:name="android.permission.GET_TASKS" />  
 
<uses-permission android:name="android.permission.GET_TASKS" />