Need help making rectangles function like buttons (Android)

Question

So I'm quite a noob using the Android SDK (I find it very confusing compared to straight java). This is my second day using it, teaching myself the whole way.

With that mentioned, I would like to know how to make a Rect act as a button.

Basically the user will tap on a certain Rectangle (that has been drawn on the screen, but how to draw it is a different question; I am completely lost with Canvas) and then I want to check the x/y coords of where they touched and see if was contained inside the rectangle, at which point the app will do something (like change the text in a textview somewhere on the UI).

I've been trying to do this for about an hour with no luck, if anyone could write up a small piece of source code on how to do this I would appreciate it a lot!

Answer 1

So I'm going to assume you're using a SurfaceView to draw on. What you want should be pretty simple.

First, override the touch event in the surface view and store off the coordinates of the last touch:

@Override
public void onTouchEvent(MotionEvent event) {
 x = event.getX();
 y = event.getY();
}

Then, check if your rect contains that coordinate:

Rect rect = new Rect() // Your rect

if (rect.contains(x, y) {
  // Contained in your rect
} else {
  // Not contained in your rect
}

I believe that's what your asking? Let me know if you're still confused.