When is view ondraw called

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Viewed 42k times. Improve this question. CptSupermrkt CptSupermrkt 6, 10 10 gold badges 52 52 silver badges 84 84 bronze badges. None of the measurements are yet known when onFinishInflate completes, it is only when the View is actually "rendered" they calculated i.

Add a comment. Active Oldest Votes. AFAIK, a View's onDraw is called when: The view is initially drawn Whenever invalidate is called on the view Invalidate can be called by you or the system whenever needed. Improve this answer. Raghav Sood Raghav Sood 80k 20 20 gold badges silver badges bronze badges. This is not the case for ViewGroup s. See my answer stackoverflow. One aspect to pay attention to is that View's onDraw is not guaranteed to be called immediately after invalidate.

Like the doc says, after invaldiate , if the view is visible, onDraw android. Take a look at this answer. Community Bot 1 1 1 silver badge. Chad Bingham Chad Bingham Is a way we can intercept before calling back onDraw , would you like to check my question stackoverflow.

Gagandeep Singh Gagandeep Singh This answer is outdated, the API is updated so that it calculates the "dirty rectangle" by itself, and thus this function is deprecated. Let's work to help developers, not make them feel stupid. Related Questions. How do I insert the data saved in the room android and put it into my custom adapter along with a custom list item.

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Calling controller method from view. Layout: fixed fluid. The following is a detailed explanation:. However, onDraw will not be called. We may encounter this problem: if you do not set a background to LinearLayout, the system will not call onDraw, that is to say, we will not call onDraw. After setting a background, onDraw will be called.

The reason for this phenomenon is inherited from LinearLayout, and LinearLayout is a container, ViewGroup, it does not have anything to draw itself, it is a transparent control, because it will not trigger onDraw, but you now give LinearLayout sets a background color. In fact, no matter what color you set this background color, the system will think that there is something to draw on this LinearLayout, so it will call the onDraw method.

We can carefully analyze the source code of View.