@Override
 public void afterViewCreated() {
   setTitle(getString(R.string.title_class_week));
   long classId = getIntent().getLongExtra(ExtraKeys.CLASS_TABLE_ENTITY_ID, 1L);
   classEntity = classManager.getDataById(classId);
   classNameTv.setText(classEntity.getClassName());
   int startWeek = classEntity.getStartWeek();
   int endWeek = classEntity.getEndWeek();
   weekResultTv.setText(String.format(WEEK_RESULT_FORMAT, startWeek, endWeek));
   initPicker(startWeekPicker, startWeek);
   initPicker(endWeekPicker, endWeek);
 }
 @OnClick(R.id.confirmBtn)
 void click_confirm() {
   if (startWeekPicker.getValue() == classEntity.getStartWeek()
       && endWeekPicker.getValue() == classEntity.getEndWeek()) {
     finish();
     return;
   }
   if (isInfoCorrect()) {
     classEntity.setStartWeek(startWeekPicker.getValue());
     classEntity.setEndWeek(endWeekPicker.getValue());
     classManager.update(classEntity);
     showToast("课程始末周已修改");
     setResult(RESULT_OK);
     finish();
   } else {
     showToast("起始周不能大于结束周");
   }
 }