相同的输出返回true和false？

Question

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_BACK) && web_view().canGoBack()) {
        web_view().goBack();
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

I have this code and changing the return true to return false has the same effect. Can someone explain why?

Answer 1

From the View#onKeyDown docs ,

Returns
boolean If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

The return true / return false doesn't affect you here. It affects the next receiver of the event. If you return true, the event won't be propagated to the next potential onKeyDown receiver.