how to detect when a ImageView is in collision with another ImageView?

问题

Im developing a test game with some imageviews on the screen.

with the finger, i am moving another imageview.

I want to detect when the imageview moved by the finger has touched another imageview.

¿Wich is the best way to achieve it? I can't find info about it on google...

Thanks

回答1:

I'll answer the general question - find out when two views overlap:

private boolean viewsOverlap(View v1, View v2) {
    int[] v1_coords = new int[2];
    v1.getLocationOnScreen(v1_coords);
    int v1_w = v1.getWidth();
    int v1_h = v1.getHeight();
    Rect v1_rect = new Rect(v1_coords[0], v1_coords[1], v1_coords[0] + v1_w, v1_coords[1] + v1_h);

    int[] v2_coords = new int[2];
    v2.getLocationOnScreen(v1_coords);
    int v2_w = v2.getWidth();
    int v2_h = v2.getHeight();
    Rect v2_rect = new Rect(v2_coords[0], v2_coords[1], v2_coords[0] + v2_w, v2_coords[1] + v2_h);

    return v1_rect.intersect(v2_rect) || v1_rect.contains(v2_rect) || v2_rect.contains(v1_rect);
}

My trigonometry is a little shaky these days so I'm not sure about this part:

OVERLAP ==  v1_rect.intersect(v2_rect) || v1_rect.contains(v2_rect) || v2_rect.contains(v1_rect);

Double check me. Good luck.

回答2:

Try using the intersect method of class Rect:

https://stackoverflow.com/a/19086884/3249477

来源：https://stackoverflow.com/questions/24600378/how-to-detect-when-a-imageview-is-in-collision-with-another-imageview