Android：在操作系统启动时重新创建警报时出现空指针异常？

我将在Android操作系统启动时创建并重新创建警报

这就是我在清单中使用此代码的原因：

<receiver android:name=".RecreateTwoMonthAlarm" >         
        <intent-filter>             
            <action android:name="android.intent.action.BOOT_COMPLETED" /> 
            <category android:name="android.intent.category.HOME" />         
        </intent-filter>     
    </receiver> 

//但我得到了符号错误，比如：MODE\u WORLD\u READABLE无法解析为变量

Calendar calendar_GST_18_June_2011 = Calendar.getInstance();
            calendar_GST_18_June_2011.setTimeInMillis(System.currentTimeMillis());
            calendar_GST_18_June_2011.set(2011, 5, 18, myPrefs.getInt("hour", 00), myPrefs.getInt("minute", 00), 0); // here i got exception
            if(!(calendar_GST_18_June_2011.getTimeInMillis()<=currentTime)){
                AM_2M_GST_1 = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
                intent = new Intent(context, AlarmReceiverNotificationForTwoMonth.class);
                intent.putExtra("MyMessage","Your 2 Monthly GST return is DUE on 20th June 2011.");
                PI_2M_GST_1 = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
                AM_2M_GST_1.set(AlarmManager.RTC_WAKEUP,   calendar_GST_18_June_2011.getTimeInMillis(), PI_2M_GST_1);
            }

            // for the GST 19 August 2011
            Calendar calendar_GST_17_August_2011 = Calendar.getInstance();
            calendar_GST_17_August_2011.setTimeInMillis(System.currentTimeMillis());
            calendar_GST_17_August_2011.set(2011, 7, 17,myPrefs.getInt("hour", 00), myPrefs.getInt("minute", 00), 0);
            if(!(calendar_GST_17_August_2011.getTimeInMillis()<=currentTime)){
                AM_2M_GST_2 = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
                Intent in2 = new Intent(context, AlarmReceiverNotificationForTwoMonth.class);
                in2.putExtra("MyMessage","Your 2 Monthly GST return is DUE on 19th August 2011.");
                PI_2M_GST_2 = PendingIntent.getBroadcast(context, 1, in2, PendingIntent.FLAG_UPDATE_CURRENT);
                AM_2M_GST_2.set(AlarmManager.RTC_WAKEUP,  calendar_GST_17_August_2011.getTimeInMillis(),PI_2M_GST_2);
            }

请帮帮我

---

谢谢。

尝试使用Context.WORLD\u MODE\u READABLE，根据调用这段代码的位置，它可能不会认为“this”是Context类型（例如在匿名函数或内部类中）

获取NullPointer异常？log在哪里？我已经注释了我得到异常的那一行。不管怎样，让我在第二次到达时把日志放好。等待更新a我正在处理另一个项目。myPrefs在哪里启动？从这个角度来看，我希望它是空的。是的，可能是真的。现在我不打算初始化。若我要在我的代码开始之前初始化它，我会得到syntex错误。@LalitPoptani:请查看更新的问题。

Calendar calendar_GST_18_June_2011 = Calendar.getInstance();
            calendar_GST_18_June_2011.setTimeInMillis(System.currentTimeMillis());
            calendar_GST_18_June_2011.set(2011, 5, 18, myPrefs.getInt("hour", 00), myPrefs.getInt("minute", 00), 0); // here i got exception
            if(!(calendar_GST_18_June_2011.getTimeInMillis()<=currentTime)){
                AM_2M_GST_1 = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
                intent = new Intent(context, AlarmReceiverNotificationForTwoMonth.class);
                intent.putExtra("MyMessage","Your 2 Monthly GST return is DUE on 20th June 2011.");
                PI_2M_GST_1 = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
                AM_2M_GST_1.set(AlarmManager.RTC_WAKEUP,   calendar_GST_18_June_2011.getTimeInMillis(), PI_2M_GST_1);
            }

            // for the GST 19 August 2011
            Calendar calendar_GST_17_August_2011 = Calendar.getInstance();
            calendar_GST_17_August_2011.setTimeInMillis(System.currentTimeMillis());
            calendar_GST_17_August_2011.set(2011, 7, 17,myPrefs.getInt("hour", 00), myPrefs.getInt("minute", 00), 0);
            if(!(calendar_GST_17_August_2011.getTimeInMillis()<=currentTime)){
                AM_2M_GST_2 = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
                Intent in2 = new Intent(context, AlarmReceiverNotificationForTwoMonth.class);
                in2.putExtra("MyMessage","Your 2 Monthly GST return is DUE on 19th August 2011.");
                PI_2M_GST_2 = PendingIntent.getBroadcast(context, 1, in2, PendingIntent.FLAG_UPDATE_CURRENT);
                AM_2M_GST_2.set(AlarmManager.RTC_WAKEUP,  calendar_GST_17_August_2011.getTimeInMillis(),PI_2M_GST_2);
            }

    02-03 12:19:27.612: ERROR/AndroidRuntime(246): FATAL EXCEPTION: main
02-03 12:19:27.612: ERROR/AndroidRuntime(246): java.lang.RuntimeException: Unable to start receiver com.project.TaxToolbox.RecreateTwoMonthAlarm: java.lang.NullPointerException
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at android.app.ActivityThread.handleReceiver(ActivityThread.java:2821)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at android.app.ActivityThread.access$3200(ActivityThread.java:125)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2083)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at android.os.Looper.loop(Looper.java:123)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at android.app.ActivityThread.main(ActivityThread.java:4627)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at java.lang.reflect.Method.invokeNative(Native Method)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at java.lang.reflect.Method.invoke(Method.java:521)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at dalvik.system.NativeStart.main(Native Method)
02-03 12:19:27.612: ERROR/AndroidRuntime(246): Caused by: java.lang.NullPointerException
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at com.project.TaxToolbox.RecreateTwoMonthAlarm.onReceive(RecreateTwoMonthAlarm.java:46)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     at android.app.ActivityThread.handleReceiver(ActivityThread.java:2810)
02-03 12:19:27.612: ERROR/AndroidRuntime(246):     ... 10 more