Question

在主要活动警报开始这是代码 private PendingIntent pendingIntent; 私人AlarmManager经理;

    Intent alarmIntent = new Intent(this, AlarmReceiver.class);
    pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);

    manager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    int interval = 10000; // 10 seconds

    manager.setRepeating(AlarmManager.RTC_WAKEUP,System.currentTimeMillis(), interval, pendingIntent);
    Toast.makeText(this, "Alarm Set", Toast.LENGTH_SHORT).show();

如何取消AlarmReceiver.class中的警报

   public class AlarmReceiver extends BroadcastReceiver {

static DatabaseHandler dbHandler;

private PendingIntent pendingIntent;
private AlarmManager manager;

     public void onReceive(Context context, Intent intent) {
             // SHOW NOTIFICATION
         Log.e("DAYDAY", "" + "pasok");
         int days = 1;
         Toast.makeText(context, "DAYDAY", 10).show();
            if (days == 5) {
                dbHandler.deleteUser();

                    manager.cancel(pendingIntent);
                     Toast.makeText(context, "Canceled", 10).show();

            }else{
                int = days + 1;
                 dbHandler.update_days(i, emp_id, birthday);
            }


     }

}

如果天数等于5，那么我将取消闹钟。但错误是管理器是空指针。

Answer 1

每次使用经理时，都需要手动调用：

manager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);

Answer 2

你必须使用

再次获得它

manager =（AlarmManager）context.getSystemService（Context.ALARM_SERVICE）;

Answer 3

您收到空指针，因为pendingIntent和'alarm manager'未在您的代码中的任何位置初始化。

要取消闹钟，请尝试以下代码 -

Intent alarmIntent = new Intent(this, AlarmReceiver.class);
// get pending intent by unique tag value assigned previously
int tag = 0;
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, tag, alarmIntent, PendingIntent.FLAG_UPDATE_CURRENT);

AlarmManager manager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
manager.cancel(pendingIntent);
Toast.makeText(this, "Alarm Canceled", Toast.LENGTH_SHORT).show();

在AlarmManager中取消警报onReceive

3 个答案: