title: place image button over the image background on android
body: <p>in my app i have a background image and need to place an image button at the specified location of the background image.i did by using frame layout with  <code>android:layout_gravity</code>,<code>layout_alignBottom</code> and <code>marginLeft and right</code> properties. please refer image no :1 </p>
  
  <p>i set it for one emulator and it works but i get  wrong when launch other emulator of different size  so how to set image view over a background image so that imageview not changes its position for any size of screen. </p>
  
  <p>Is there any possibilities to  trigger action find by touching image button on the screen(both background image and image button combined as single image - please refer Image no 2)
  <img src="https://i.stack.imgur.com/2OjVB.png" alt="enter image description here">
  <img src="https://i.stack.imgur.com/5Sx0a.png" alt="enter image description here"></p>