java错误:找不到符号方法getSupportActionBar()、findViewById(int)、getApplicationContext()
所以我的ScheduleFragment中有这段代码,我的目标是查看一个简单的日历查看器。但不幸的是,标题中提到了一个错误。即使我将“public class ScheduleFragment Extendes Fragment”更改为“public class ScheduleFragment Extendes AppCompatActivity”,它也会给@Override带来一个错误
@TargetApi(Build.VERSION_CODES.N)
public class ScheduleFragment extends Fragment {
CompactCalendarView compactCalendar;
private SimpleDateFormat dateFormatMonth = new SimpleDateFormat("MMM - yyyy", Locale.getDefault());
public ScheduleFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_schedule, container, false);
final ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(false);
actionBar.setTitle(null);
compactCalendar = (CompactCalendarView) findViewById(R.id.compactcalendar_view);
compactCalendar.setUseThreeLetterAbbreviation(true);
Event ev1 = new Event(Color.RED, 1477040400000L, "Teachers' Professional Day");
compactCalendar.addEvent(ev1);
compactCalendar.setListener(new CompactCalendarView.CompactCalendarViewListener() {
@Override
public void onDayClick(Date dateClicked) {
Context context = getApplicationContext();
if (dateClicked.toString().compareTo("Fri Oct 21 00:00:00 AST 2016") == 0) {
Toast.makeText(context, "Teachers' Professional Day", Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(context, "No Events Planned for that day", Toast.LENGTH_SHORT).show();
}
}
@Override
public void onMonthScroll(Date firstDayOfNewMonth) {
actionBar.setTitle(dateFormatMonth.format(firstDayOfNewMonth));
}
});
}
}
# 1 楼答案
在我看来,你应该放大视图并使用视图。findViewByID(R.id.id), 然后在方法末尾调用return
# 2 楼答案
在片段中,您不能直接调用
findViewById()
,而必须使用刚刚膨胀的视图并对其调用findViewById()
所以你的onCreateView代码是
类似地,对于
getApplicationContext()
,您首先需要调用getContext()
,然后对其调用getApplicationContext()
所以它变成了这同样适用于
getSupportActionBar();