Question

I want to implement this method:

//#OnTouchEvent()
public boolean onTouchEvent(MotionEvent event) {
//Coordinates of the touch
int x = (int) event.getX();
int y = (int) event.getY();

switch(event.getAction()) {
    case MotionEvent.ACTION_DOWN:
    // Check if the touch is within the coordinates of an image
            if x isBetweenCoordinatesXofTheImage
                 if y isBetweenCoordinatesYofTheImage
                     //DoSomething
            else
                 //DoNothing
    break;
    case MotionEvent.ACTION_MOVE:
            //nothing
    break;
    case MotionEvent.ACTION_UP:
    //check if the touch is within the coordinates of an image;
            if x is betweenCoordinatesX of the image
                 y is betweenCoordinatesYofTheImage
                     //DoSomething
            else
                 //DoNothing
    break;
    }
    return true;
 }

An ImageView has 4 coorners and I need to know the 4 coordinates (x,y) to do the check before.
The upper left corner has the same X-coordinate as the lower left and upper right will have the same X coordinate to the lower right. for Y coordinates is similar.
My problem is: how I can obtain the 4 coordinates of a ImageView?

THANKS for all!!!

Answer 1

Just a small question:
Why not set the ImageView itself a touch listener?
If that’s not an options then try:

int pos[] = new int[2];
yourImageView.getLocationOnScreen(pos);

After you’ll call this method the array will contain the upper left coordinate of your view.
To get the other coordinates just use the height and width of the view:

yourImageView.getWidth();
yourImageView.getHeight();

Make sure those three methods are called only AFTER the view has drawn on the screen – (invoking them in the onCreate will return 0 to all values).