How to detect the top and bottom coordinates of the screen?

Asked Sep 26 '15 at 16:05

Active Sep 26 '15 at 17:29

Viewed 87 times

I have the following code that works:

Button b = (Button) findViewById(R.id.my_button);
if(b != null) {
    Rect bounds = new Rect();
    parentLayout.getHitRect(bounds);
    if(b.getLocalVisibleRect(bounds)) {
        //it is visible, do code
    }
}

Question: How can I change the code so that the I do what I am currently doing inside if(b.getLocalVisibleRect(bounds)) but when the middle of or the complete button has appeared?
With my code now, I can detect when the upper edge of the button has appeared. But it would be best if I was able to detect when almost all of the button has appeared.

edited Sep 26 '15 at 17:00

asked Sep 26 '15 at 16:05

Jim

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what is the use case for doing this? – Rahul Tiwari Sep 26 '15 at 16:12
@RahulTiwari: I am doing an animation of another element and I think that if I was more accurate the transition would be perfect. Now it is ok, but since I am learning android I want to see how things can improve – Jim Sep 26 '15 at 16:20
Please have a look at this link and see the third answer https://stackoverflow.com/questions/4628800/android-how-to-check-if-a-view-inside-of-scrollview-is-visible – waleedsarwar86 Sep 26 '15 at 16:20
This is not correct. This does not show if the button is part of the visible screen – Jim Sep 26 '15 at 16:30
@jim I misunderstand your question.I have edited my answer please try it now. – waleedsarwar86 Sep 26 '15 at 17:09
What is the variable `r`? – Jim Sep 26 '15 at 17:10
replace it with bounds – waleedsarwar86 Sep 26 '15 at 17:13
Tried it, I don't see any difference with my approach – Jim Sep 26 '15 at 17:22
check the link i provide you in answer – waleedsarwar86 Sep 26 '15 at 17:30

How to detect the top and bottom coordinates of the screen?

0 Answers0