Android - 如何在服务运行时停止启动服务间隔？

Question

我有一个名为 myService 的服务类，我使用间隔来运行该服务

代码如下：

public class myService extends Service {
    public Runnable mRunnable = null;
    IBinder mBinder = new LocalBinder();

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

    public class LocalBinder extends Binder {
        public myService getServerInstance() {
            return myService.this;
        }
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        final Handler mHandler = new Handler();
        mRunnable = new Runnable() {
            @Override
            public void run() {
                Log.d("Service jalan", "beneran dah");
                DatabaseHandler db = new DatabaseHandler(getApplicationContext());
                List<Contact> contacts = db.getAllContacts();
                for (Contact cn : contacts)
                {
                    int idsql = cn.getID();
                    if(String.valueOf(cn.getFlag()).equals("0")){
                        Log.d("Id", String.valueOf(cn.getID()) + " Flag :" + cn.getFlag());
                        sending a  = new sending(); //communicate to server
                        a.execute();
                    }
                    else
                    {
                        Log.d("Data kosong", "atau tidak ada flag = 0");
                    }
                }
                mHandler.postDelayed(mRunnable, 30 * 1000);
            }
        };
        mHandler.postDelayed(mRunnable, 30 * 1000);
        return super.onStartCommand(intent, flags, startId);
    }
}

问题：

当我的服务仍在 if statement 上运行但间隔已经循环 30 秒时，我的服务将再次启动，

我怎样才能避免这种情况？

Answer 1

您可以在重启服务之前使用标志检查服务是否正在进行

 boolean isInProgress = false;
 mRunnable = new Runnable() {
            @Override
            public void run() {
                Log.d("Service jalan", "beneran dah");
                if(!isInProgress){
                isInProgress = true;
                DatabaseHandler db = new DatabaseHandler(getApplicationContext());
                List<Contact> contacts = db.getAllContacts();
                for (Contact cn : contacts)
                {
                    int idsql = cn.getID();
                    if(String.valueOf(cn.getFlag()).equals("0")){
                        Log.d("Id", String.valueOf(cn.getID()) + " Flag :" + cn.getFlag());
                        sending a  = new sending(); //communicate to server
                        a.execute();
                    }
                    else
                    {
                        Log.d("Data kosong", "atau tidak ada flag = 0");
                    }
                  }
                 isInProgress = false;
               }
                mHandler.postDelayed(mRunnable, 30 * 1000);
            }