粘性Service

import java.util.List;

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

public class PushService extends Service {

@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();

new SeekServiceThread().start();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return Service.START_STICKY;//绮樻�Service鏍囪瘑锛屽綋Service缁勪欢鍦ㄩ潪鎰忔効鏃惰鍋滄鍚庯紝鏈夋満鐜囬噸鍚�
}

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

//鏌ユ壘褰撳墠缁勪欢鐨勭嚎绋嬶紝濡傛灉褰撳墠姝ｈ繍琛岀殑鏈嶅姟缁勪欢涓嶅寘鍚玃ushService缁勪欢鏃讹紝鍒欏惎鍔�
class SeekServiceThread extends Thread{

@Override
public void run() {

while(true){

//1.鑾峰彇Activity缁勪欢绠＄悊鍣紙绠＄悊褰撳墠搴旂敤鐨勮繘绋嬨�鏈嶅姟缁勪欢銆佷换鍔℃垨鍥為�鏍堬級
ActivityManager mgr=(ActivityManager) getSystemService(ACTIVITY_SERVICE);

//2. 鑾峰彇姝ｈ繍琛岀殑鏈嶅姟缁勪欢
List<RunningServiceInfo> rServices = mgr.getRunningServices(100);

boolean isFinded=false;//鏍囪瘑鏄惁鏌ユ壘鍒板綋鍓嶇殑service缁勪欢
for(RunningServiceInfo rService:rServices){
if(rService.getClass().getName().equals(PushService.class.getName())){
isFinded=true;
}
}

if(!isFinded){ //濡傛灉娌℃湁鏌ユ壘鍒帮紝鍒欏惎鍔ㄦ湰鏈嶅姟缁勪欢

startService(new Intent(getApplicationContext(),PushService.class));
}

try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}

}
}

}