clickable image inside canvas

Question

I have create a canvas in android and inside that i have multiple bitmap images.not i want to make these images click able.

I have tried following things so far..

I tried to add bitmap in image view as imageview has a setOnClickListner but i think ImageView can't be added into Canvas , so i dropped this idea. because even Bitmap itself has no click events.

Answer 1

If you want to use Canvas, keep in mind that it is a low level drawing mechanism.

Therefore, you need to implement the click logic yourself.

• Catch the coordinates of any incoming TouchEvent.
• If the TouchEvent is a "touch down" (finger pressed) or "touch up" (finger released), depending on your choice, consider it to be a click.
• Compare the click event coordinates to every attached image's bounding box to find which image was touched. Take the z-index into account in case of overlap.
• Trigger an onClickListener.

You also have to keep the coordinates of all images and the corresponding onClickListeners somewhere in memory.

Other solution:

Use a Layout, possibly a RelativeLayout, in which you add the ImageViews as children.