How to tap on button using XY coordinates in UIAutomator with Java?

I have in Appium/Python :

//calculation max_height
//calculation of max_width
action = TouchAction(self.driver)
action.tap(None, max_width, max_height).release().perform()

My goal is to perform same, but in Java using UIautomator tool. I have tried the next script, but it does not work.

UiObject appButton = new UiObject(new UiSelector());
appButton.click(int x, int y);

My app made in Unity and i do not have any locator's accessibility, so i have to use XY position on the screen.

Does anybody solve this issue? Thanks.