java.lang.NullPointerException：尝试调用虚拟方法'android.app.ActivityThread$ApplicationThread

我知道这可能是重复的，但我的情况不同，需要对这个具体问题进行一些解释。

我收到错误：

java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference

In the onClick方法addEvent从类中调用MyCalendar

button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            MyCalendar myCalendar = new MyCalendar();
            myCalendar.addEvent();
          //  myCalendar.AddEvent(2,context);
       }
    });

它调用下面的方法

public void addEvent(){
    Calendar beginTime = Calendar.getInstance();
    beginTime.set(2018, 11, 14, 7, 30);
    Calendar endTime = Calendar.getInstance();
    endTime.set(2018, 11, 14, 8, 30);
        Intent intent = new Intent(Intent.ACTION_INSERT)
            .setData(Events.CONTENT_URI)
            .putExtra(CalendarContract.EXTRA_EVENT_BEGIN_TIME, beginTime.getTimeInMillis())
            .putExtra(CalendarContract.EXTRA_EVENT_END_TIME, endTime.getTimeInMillis())
            .putExtra(Events.TITLE, "TEST ANDROID")
            .putExtra(Events.DESCRIPTION, "EVENT HAS BEEN ADDED FROM ANDROID STUDIO")
            .putExtra(Events.EVENT_LOCATION, "GIBRALTAR")
            .putExtra(Events.AVAILABILITY, Events.AVAILABILITY_BUSY)
            .putExtra(Events.CALENDAR_ID, 2)
            .putExtra(Intent.EXTRA_EMAIL, "[email protected] /cdn-cgi/l/email-protection");
    startActivity(intent);
}

当该方法在MainActivity但现在我已将其移至另一个班级，它显示了上述异常。

我怎样才能解决这个问题？

您需要将调用活动作为上下文参数传递给您的new MyCalendar(context)称呼。然后从您的日历类中调用context.startActivity(intent)