Can Not Find a View With Findviewbyid()

findViewById() not finding custom view but it exists in layout

Because in the constructor, you had super(context) instead of super(context, attrs).

Makes sense, if you don't pass in the attributes, such as the id, then the view will have no id and therefore not be findable using that id. :-)

Answer ref : findViewById() returns null for custom component in layout XML, not for other components

Can't retrieve view with findViewById

Your text_view is in the fragment layout and not in the activity layout. It won't be in the activity view hierarchy yet in onCreate() and findViewById() won't find it, returning null. The NPE in your stacktrace is caused by trying to invoke a method on this null.

Move the findViewById() and related code to the fragment's onCreateView(), calling findViewById() on the rootView inflated there.

Cannot resolve 'findViewById' method in Fragment RecyclerView

Add these variables:

View root;
RecyclerView recyclerView;

Change your onCreateView to this:

public View onCreateView(@NonNull LayoutInflater inflater,
                         ViewGroup container, Bundle savedInstanceState) {
    root = inflater.inflate(R.layout.fragment_profile, container, false);
    recyclerView = root.findViewById(R.id.recyclerView);
    return root;
}

and lastly - make sure that your recyclerview within your XML file has the following:

 android:id="@+id/recyclerView"

findViewById not working for specific view

Change the super call in your two-parameter constructor to:

super(context, attrs);

When a View is inflated from a layout, the XML attributes and their values are passed into the two-parameter constructor via the AttributeSet. If you don't pass that to the superclass, the id you've specified in the XML is never set on the View, so findViewById() won't find it with the given ID.

Cannot resolve findViewById in fragment

Firstly, you are calling findViewById() after the return statement so they wont be executed at all. Next, you need to call findViewById() on the context of a view as in view.findViewById(int); so rewrite the code as :

View v = inflater.inflate(R.layout.activity_slide__teacher_add,container,false);
teacher_id_number = v.findViewById(R.id.teacher_id_number); //Note this line
//other tasks you need to do
return v;

making sure the return is the last statement of the function.

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