Remove the error indicator from a previously-validated EditText widget

protected void onPause () {
    TextView textView = ...; // fetch it as appropriate
    textView.setError(null);
}

Because as mentioned in the documentation:

If the error is null, the error message and icon will be cleared.

In Kotlin:

editText.error = null

Kotlin Extension Function:

To make it more readable, you could add this extension function

fun EditText.clearError() {
    error = null
}

In Java:

editText.setError(null);

You can also do it using following :

protected void onPause () {    
    mEditText.setError(null);//removes error
    mEditText.clearFocus();    //clear focus from edittext
}