Question

您好，在我的应用程序中，我设计了具有日期和时间的应用程序，我想在特定时间和日期发出通知。

现在我的问题是，如果我更改了系统日期，也会根据当前日期和系统日期发出通知，我想要触发通知。

任何人都可以帮我解决问题

MyView类

public class MyView extends Activity {
    TextView tv;
     Button btn;
    /** Called when the activity is first created. */

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //Calendar Calendar_Object = Calendar.getInstance();
         Calendar firingCal = Calendar.getInstance();


           firingCal.set(Calendar.DAY_OF_MONTH, 10);
            firingCal.set(Calendar.MONTH, 7);
            firingCal.set(Calendar.YEAR, 14);


            Calendar firingCal1 = Calendar.getInstance();


               firingCal1.set(Calendar.HOUR_OF_DAY, 15);
                firingCal1.set(Calendar.MINUTE, 55);
                firingCal1.set(Calendar.SECOND, 0);




        // MyView is my current Activity, and AlarmReceiver is the
        // BoradCastReceiver
        Intent myIntent = new Intent(MyView.this, AlarmReceiver.class);

        PendingIntent pendingIntent = PendingIntent.getBroadcast(MyView.this,
                0, myIntent, 0);

        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

        /*
         * The following sets the Alarm in the specific time by getting the long
         * value of the alarm date time which is in calendar object by calling
         * the getTimeInMillis(). Since Alarm supports only long value , we're
         * using this method.
         */

        alarmManager.set(AlarmManager.RTC_WAKEUP, firingCal.getTimeInMillis(),
                pendingIntent);
        alarmManager.set(AlarmManager.RTC_WAKEUP, firingCal1.getTimeInMillis(),
                pendingIntent);
    }
}

谢谢你。

更新了代码

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //Calendar Calendar_Object = Calendar.getInstance();
        /* Calendar firingCal = Calendar.getInstance();


           firingCal.set(Calendar.DAY_OF_MONTH, 10);
            firingCal.set(Calendar.MONTH, 7);
            firingCal.set(Calendar.YEAR, 14);


            Calendar firingCal1 = Calendar.getInstance();


               firingCal1.set(Calendar.HOUR_OF_DAY, 23);
                firingCal1.set(Calendar.MINUTE, 55);
                firingCal1.set(Calendar.SECOND, 0);

                */
        String input = "Sat Feb 17 2015";
        Date date = null;
        try {

            date = new SimpleDateFormat("EEE MMM dd yyyy", Locale.ENGLISH).parse(input);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } //What ever might be your format
        long milliseconds = date.getTime();
        long millisecondsFromNow = milliseconds - (new Date()).getTime();
        new CountDownTimer(millisecondsFromNow , 1000) {

             public void onTick(long millisUntilFinished) {

             }

             public void onFinish() {
                //It's your date. Do your stuff here.
             }
          }.start();

        // MyView is my current Activity, and AlarmReceiver is the
        // BoradCastReceiver
        Intent myIntent = new Intent(MyView.this, AlarmReceiver.class);

        PendingIntent pendingIntent = PendingIntent.getBroadcast(MyView.this,
                0, myIntent, 0);

        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

        /*
         * The following sets the Alarm in the specific time by getting the long
         * value of the alarm date time which is in calendar object by calling
         * the getTimeInMillis(). Since Alarm supports only long value , we're
         * using this method.
         */

        /*alarmManager.set(AlarmManager.RTC_WAKEUP, firingCal.getTimeInMillis(),
                pendingIntent);
        alarmManager.set(AlarmManager.RTC_WAKEUP, firingCal1.getTimeInMillis(),
                pendingIntent);*/
    }
}

Answer 1

您可以使用服务器时间或网络提供商时间..以下是从网络提供商处获取时间的代码..

LocationManager locationManager = (LocationManager)activity.getSystemService(activity.LOCATION_SERVICE);

long networkTimeOnRequest = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER).getTime();

现在，networkTimeOnRequest将保留确切的网络时间，您可以使用它来与您指定的日期/时间进行比较。

Answer 2

String input = "Sat Feb 17 2015";
Date date = new SimpleDateFormat("EEE MMM dd yyyy", Locale.ENGLISH).parse(input); //What ever might be your format

long milliseconds = date.getTime();
long millisecondsFromNow = milliseconds - (new Date()).getTime();
                                          //Instead of new Date() you can get your server time here.

并像这样设置计时器

new CountDownTimer(millisecondsFromNow , 1000) {

     public void onTick(long millisUntilFinished) {

     }

     public void onFinish() {
        //It's your date. Do your stuff here.
     }
  }.start();

日期和时间通知未在Android中触发

2 个答案: