如何在android中的Dialogfragment中设置警报管理器

Question

我正在为我的应用程序创建警报类型通知。但面临空指针错误。从对话框片段中，AlarmManager 指示空值。这是我的代码。

if(alermId>=0){
         Log.e("Alerm Id: ",""+alermId);
            Intent alermReceiver = new Intent(getActivity(), AlermReceiver.class);
            alermReceiver.setAction(DietInformation.ACTION_DIET);
            alermReceiver.putExtra("title",titleView.getText());
            alermReceiver.putExtra("day",repeatView.getText());
            alermReceiver.putExtra("menu",menuView.getText());
            PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(),alermId,alermReceiver,0);
            //ApplicationData.getAlarmManager().setRepeating(AlarmManager.RTC_WAKEUP,reminderTimeInMills,24*60*60*1000*7,pendingIntent);
            //ApplicationMain.getAlarmManager().setRepeating(AlarmManager.RTC_WAKEUP,reminderTimeInMills,24*60*60*1000*7,pendingIntent);
             //alarmManager =
           AlarmClass.getAlarmManager().setRepeating(AlarmManager.RTC_WAKEUP,reminderTimeInMills,24*60*60*1000*7,pendingIntent);
        } 

为了实例化警报管理器，我创建了一个内部类，如下所示

   static class AlarmClass extends Application{
           public static AlarmManager alarmManager;
           AlarmClass(){
               alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
           }
           public static AlarmManager getAlarmManager() {
               return alarmManager;
           }
       }

但应用程序显示空指针错误。喜欢

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.AlarmManager.setRepeating(int, long, long, android.app.PendingIntent)' on a null object reference
            at com.softmaker.gazi_opu.personalhealthcare.fragment.CreateDietFragment.setReminder(CreateDietFragment.java:406)

谁能推荐我。如何为 setRepeating(....) 实例化 alarmMenager;

Answer 1

尝试更改应用程序类中的代码

static class AlarmClass extends Application{
       public static AlarmManager alarmManager;
       Context mContext;
       AlarmClass(){
           mContext = this;
           alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
       }
       public static AlarmManager getAlarmManager() {

           if(alarmManager==null){

             alarmManager = (AlarmManager) mContext.getSystemService(ALARM_SERVICE);

           }
           return alarmManager;
       }
   }