在已杀死的应用程序

时间:2017-09-18 10:11:00

标签: android android-intent nullpointerexception alarmmanager

我想通过闹钟管理器启动我的服务。我写下面的代码。当我的应用程序处于后台或前台时,但当我杀死我的应用程序时(我的意思是从最近的应用程序中滑动应用程序),此代码运行良好,程序会出错。我不知道我的问题是什么,如何解决这个问题。

错误:

Caused by: java.lang.NullPointerException at com.company.test.helper.ServiceSchedular.startService(ServiceSchedular.java:74)

我有一个类,从下面的应用程序扩展:

public class KITILApplication extends Application{

private static Context context;
@Override
public void onCreate() {
    // TODO Auto-generated method stub
    super.onCreate();
    ACRA.init(this);
    ORMDroidApplication.initialize(this);
    KITILApplication.context=getApplicationContext();
}

public static Context getappContext(){
    return KITILApplication.context;
}
}

我的ServiceSchedularService用于安排启动服务的警报,如下所示:

public class ServiceSchedular {
     //Called from my main activity
     private ServiceSchedular() {
        alarmManager = (AlarmManager) KITILApplication.getappContext().getSystemService(Context.ALARM_SERVICE);
     }
     private static void startService(Date startDate) {
    uniqueIdForStart = (int) Calendar.getInstance().getTimeInMillis();
    //PlEASE NOTICE: I checked my application via both of startintent(comment startIntent and startIntent)
    Intent startIntent = new Intent(KITILApplication.getappContext(), LocationService.class);
    //Intent startIntent = new Intent("com.company.test.START_SERVICE");
    PendingIntent startPendingIntent = PendingIntent.getService(KITILApplication.getappContext(), uniqueIdForStart, startIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    //I get error from below line !! Line = 74
    alarmManager.set(AlarmManager.RTC_WAKEUP, millisToStartDate, startPendingIntent);
    stopService(startDate);
} 

 public static void checkNextPeriod() {
      .
       .
         startService(new Date(millisDate));
 }
 }

我有一个调用checkNextPeriod的broadcastReciever,在checkNextPeriod中,我调用了startService方法。

的AndroidManifest.xml:

<service android:name=".Service.LocationService">
        <intent-filter>
            <action android:name="com.company.test.START_SERVICE"></action>
        </intent-filter>
    </service>

我不知道我的问题是针对alarmManager对象或意图对象或应用程序上下文还是其他事情。请帮我。

1 个答案:

答案 0 :(得分:0)

你的问题在这里:

 private ServiceSchedular() {
    alarmManager = (AlarmManager) KITILApplication.getappContext().getSystemService(Context.ALARM_SERVICE);
 }

不要在构造函数中执行此操作。只需在需要时拨打getSystemService()即可。