动画方向条/功率计测量仪android

I at a loss of where to begin with this. I am try to draw a horizontal bar that has a slider moving left to right (similar to what is seen in basketball shootout games for aiming the ball). I would like to be able to control the speed it moves left to right and then stop it on touch or something of that nature.I at a loss of where to begin with this. I am t