Android graphics , dynamic view

I am looking for help/resource that will help me in bringing up a image as follows in android view.

1. Image looks like x-y axis graph, with sawtooth waves along x-axis, this is a static image develop开发者_如何转开发ed using certain tool.

2. I need help to make a line move, parallel to y-axis (red in color) that waits at origin(0,0) and starts moving along x axis until the sawtooth wave ends.

3.If you imagine this as image, there is a wave on x axis and a red line that moves across wave, which is the noise generated in android mobile.

Concern: How to overlap a static image (wave+x-y axis) with a dynamic image (red line) and make it move as the code runs. There is a timer that will generate the noise (mute/unmute microphone) and user gets to see it in screen when these interference occurs. I thank you for spending time to read my post. Please let me know if there are any redundant info , I will edit my question.

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If you subclass view you can draw whatever you want in the onDraw(). You just need to use the provided Canvas.