Android: Enable Scrollbars on Canvas-Based View

Question

I have a custom view that extends View. It displays drawn shapes, and allows the user to add to those drawings via drawing touch events to the View via onDraw.

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Answer 1

For those of you trying to add scrollbars to a custom ViewGroup (rather than View) or one of its subclasses, make sure you add setWillNotDraw(false); to your constructor in addition to doing what Ruslan Yanchyshyn said in their answer above.

More info can be seen in this question and my answer.