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The documentation is identical of these two methods:
Should any, both or a specific one be overridden when extending this class and you want to edit how children are drawn? What is the difference? What are the / examples of different use cases? Is the difference similar to the difference between these methods?
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A callback function always has a specific action which is bound to a specific circumstance. Therefore, a callback function is only called once a clearly defined operation has been performed. Event handlers are a good example of a type of callback function. These are used in HTML elements such as buttons.
The major difference between useCallback and useMemo is that useCallback will memory the returned value, whereas useMemo will memory the function. Essentially, the only difference between these hooks is that one caches a value type, and the other caches a function.
To call the callback as a method, proceed as follows: class MyClass { static function myCallbackMethod () { echo 'Hello world!'; } } In PHP, callbacks are a popular way to have functions communicate with each other.
According to this:
...Most of the time, you only need to override onChildDraw but due to limitations of platform prior to Honeycomb, you may need to implement onChildDrawOver as well...
So it's a matter of the API level you are targeting. I think nowadays you should almost always implement just onChildDraw unless your app runs on pre-Honeycomb as well.
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