public boolean backspaceQueryText(){
  int length=mQueryText.length();
  if (length > 0) {
    mQueryText.deleteCharAt(length - 1);
    mSearchOverlay.refreshOverlay();
    return true;
  }
  return false;
}

public boolean backspaceQueryText ( ) { int length = mQueryText . length ( ) ; if ( length > 0 ) { mQueryText . deleteCharAt ( length - 1 ) ; mSearchOverlay . refreshOverlay ( ) ; return true ; } return false ; }
delete the last entered character if it exists . has no effect on the matched node .
