如何在Android中及时听取变化

如果电话时间改变了，我需要做一些动作。我如何倾听时间的变化

更具体地说，我想在用户输入的特定日期到来时发送短信

我通过服务运行它。关键是我需要经常检查发送短信的日期是否已经到了

import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.telephony.gsm.SmsManager;

public class SmsService extends Service{
    String date, messege, numberphone;
    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        date=intent.getStringExtra("date"); 
        String[] dateArray = date.split(",");
        Date dateTime = new Date();


        if(dateArray[0].equals(Integer.toString(dateTime.getDate(
                ))) &&dateArray[1].equals(Integer.toString(dateTime.getMonth(
                ))) && dateArray[2].equals(Integer.toString(dateTime.getYear())))   
            sendSMS(intent.getStringExtra("numberphone"),intent.getStringExtra("message"));
        return super.onStartCommand(intent, flags, startId);
    }



    @SuppressWarnings("deprecation")
    private void sendSMS(String phoneNumber, String message)
    {        
        PendingIntent pi = PendingIntent.getActivity(this, 0,
                new Intent(this, SmsActivity.class), 0);

        SmsManager sms = SmsManager.getDefault();
        sms.sendTextMessage(phoneNumber, null, message, pi, null);        
    }  


}

---

使用action

“android.intent.action.TIME\u SET”

创建一个BroadCastReceiver并设置Receiver类

在AndroidManifest文件中

 <receiver android:name=".MyReceiver">
            <intent-filter >
                <action android:name="android.intent.action.TIME_SET"/>
            </intent-filter>
 </receiver>

getActivity（）.registerReceiver（networkReceiver，新的IntentFilter（“android.intent.action.TIME_SET”）

但问题是，在更改日期时，接收者已经被销毁，因为我正在活动暂停时注销接收者

public class MyReceiver extends BroadcastReceiver{

    @Override
    public void onReceive(final Context arg0, Intent arg1) {
        Log.d("MyReceiver", "Time Changed");
    }
}