Add the Following Code to OnClick

findViewById$($R$.$id$.$button$).$ setonClickListener$($new

android.view.View. OnclickListener$()\{$

@override public void onclick$($android$.$view.view view$)\{$

android.widget. EditText FirstWidget $=$

findViewById$($R$.$id$.$editTextFirstName$)$;

android.widget.EditText LastWidget $=$ findViewById$($R$.$id$.$editTextLastName$)$;

android.widget.EditText FullWidget $=$ findViewById$($R$.$id$.$editTextFulLName$)$;

String FullName $=$ FirstWidget. getText $().$ tostring$(()+$

LastWidget.getText$().$tostring$()$;

FullWidget. setText$($FullName$)$;

$\}\})$;

$\}$