This worked for me
mWebView.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
return true;
}
});
mWebView.setLongClickable(false);
I have not tested, if you don’t want the vibration caused by the long click, you can try this:
mWebView.setHapticFeedbackEnabled(false);