Whenever a word is typed in the EditText box, I always see an underline under the word being typed. But when I press a space after that word I no longer see the underline.>
accepted answer is not given solution, and some other user given answer but no one given full anser, so that's why i write here working solution.
If you want to remove underline then just add below code.
XML
android:inputType="textNoSuggestions"
Java
EditText ed;
ed = findViewById(yourId);
ed.setInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
If you want to set more than one input type then,
ed.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
May be above information is helpful to others.