how to use html5 canvas drag on android?

I want to use a WebView with a canvas, and to be able to use touch to d开发者_Go百科rag items in the canvas. The canvas is displayed just fine, and clicking works, but moving only scrolls. I've disabled scrolling, but it still doesn't work. Any ideas?

I found working html here http://developer.appcelerator.com/question/55121/html5-canvas-drawing-in-webview It appears that I need to learn more about the difference between touch events and mouse events.