When I test my game with the simulator it's working and running fast. On my android tablet the game just shows white screen after the splash image.
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It's normal. Directcanvas for android is still under development and not yet available.
There's a closed beta, more info here.
appmobi.com/dCAndroidbeta
Yeah, directCanvas is not actually available for Android yet, but they're working on it. For the time being try the CocoonJS launcher for Android.