[Solved] How i can use findViewById() in Android?

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If you’re trying to use findViewById in Fragment, first of all make sure you’re using onCreateView() and you’re returning the view at the end.

See the differences in here: Difference and uses of onCreate(), onCreateView() and onActivityCreated() in fragments

Here is an example for that:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_single_image, parent, false);

    alarm_timepicker = (TimePicker) rootView.findViewById(R.id.TimePicker); 
    // your widgets with rootView prefix

    return rootView;
}

rootView is the point here. So, if you want to declare any widgets (or etc), use rootView in this case as a prefix before referecning your id by findViewById.

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solved How i can use findViewById() in Android?