alarmmanager 2次

Question

我有一个BroadcastReceiver叫AlarmReceiver那个ToastS"报警工作".我试图在5:45和17:30 设置一个重复PendingIntent触发器AlarmReceiver,但是在启动应用程序几秒钟后我看到"警报工作".为什么PendingIntent立刻发送？

 public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Calendar cal1 = Calendar.getInstance();
        cal1.set(Calendar.HOUR_OF_DAY, 05);
        cal1.set(Calendar.MINUTE, 45);
        cal1.set(Calendar.SECOND, 00);

        Calendar cal2 = Calendar.getInstance();
        cal2.set(Calendar.HOUR_OF_DAY, 17);
        cal2.set(Calendar.MINUTE, 30);
        cal2.set(Calendar.SECOND, 00);

        Intent intent = new Intent(this, AlarmReceiver.class);

        PendingIntent pi = PendingIntent.getBroadcast(getApplicationContext(), 0, intent,      PendingIntent.FLAG_UPDATE_CURRENT);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, cal1.getTimeInMillis(),cal2.getTimeInMillis(), pi);


        Toast.makeText(this, "Alarm set", Toast.LENGTH_LONG).show();

    }


}

AlarmReceiver:

public class AlarmReceiver extends BroadcastReceiver {


        public void onReceive(Context context, Intent intent) {

            Toast.makeText(context, "Alarm worked.", Toast.LENGTH_LONG).show();

}

Answer 1

但是在我的应用程序启动几秒后,我看到"闹钟工作".

我相信你收到第一个警报就好了.

但你相信它不会重复.这错了,它会重复......每隔〜43年一次.您使用的第三个参数setRepeating不正确,请尝试:

Calendar cal1 = Calendar.getInstance(); // Now
cal1.add(Calendar.SECONDS, 5); // Change to five seconds from now

alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, 
        cal1.getTimeInMillis(), 
        10000, /* Repeat every 10 seconds */ 
        pi);

第三个参数是间隔.此代码创建一个在5秒内熄灭的警报,然后每10秒重复一次.通过使用cal2你不小心将间隔设置为近43年.

设置两个不同的警报使用:

Calendar cal1 = Calendar.getInstance();
cal1.set(Calendar.HOUR_OF_DAY, 05);
cal1.set(Calendar.MINUTE, 45);
cal1.set(Calendar.SECOND, 00);

Calendar cal2 = Calendar.getInstance();
cal2.set(Calendar.HOUR_OF_DAY, 17);
cal2.set(Calendar.MINUTE, 30);
cal2.set(Calendar.SECOND, 00);

// Test if the times are in the past, if they are add one day
Calendar now = Calendar.getInstance();
if(now.after(cal1))
    cal1.add(Calendar.HOUR_OF_DAY, 24);
if(now.after(cal2))
    cal2.add(Calendar.HOUR_OF_DAY, 24);

// Create two different PendingIntents, they MUST have different requestCodes
Intent intent = new Intent(this, AlarmReceiver.class);
PendingIntent morningAlarm = PendingIntent.getBroadcast(getApplicationContext(), 0, intent, 0);
PendingIntent eveningAlarm = PendingIntent.getBroadcast(getApplicationContext(), 1, intent, 0);

// Start both alarms, set to repeat once every day
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, cal1.getTimeInMillis(), DateUtils.DAY_IN_MILLIS, morningAlarm);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, cal2.getTimeInMillis(), DateUtils.DAY_IN_MILLIS, eveningAlarm);