如何在Android中使用用户手指触摸/拖动来移动对象?

I am developing an app in which I need to implement object movement following by users finger touch/drag. My object is at the bottom of the screen and it can move horizontal only. I have no idea about Gesture control or Object movement in Android. Also, the object should maintain its state, for example if user stops dragging the object it should appear to its last position only. I need to sort this out, any help would be appreciable. ThanksI am developing an app in which I need to imple