java - Trying to extend a class, while onseekbarchangelistener is implemented? -


i have 3 classes working with, drawing view sits inside of drawing box , tools button. tools button has seekbar , listener size change of stroke, stroke in canvasview class, trying extend canvas view tools class have 

public class toolbox extends appcompatactivity implements seekbar.onseekbarchangelistener

when try add extends canvasview error. how go doing this?

the error not in implements onseekbarchangelistener, in extending canvas. can extend 1 class in java. toolbox extends appcompatactivity.


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