如何使在滚动视图中（处于线性布局内）的视图无法创建？

Question

I have linear layout inside a scrollview, and i would like to keep those views which are not visible(which are inside the linear layout) from being created until they are either visible or near to being visible. Like adjacent to one that is visible. I don't know if for example if turning off visibility will keep the View from being created(in terms of resources), or if gone could be used.

Update: The reason I am asking this question is because scrolling is taking a heck of a long time when there are say 30 view elements in the linear layout. These are not large view elements either, about what you would find for a record in a listview. I should add that the whole scrollview is inside a fragment.

Thanks

Answer 1

You have a LinearLayout(vertical) with 30 children. If you scroll to the bottom, which views would then be "created"?

• If only the visible(or near visible) ones, then you can't measure how far down in the scroll they will be any more.

• If at that point you're just saying you should create them when they first appear, and stay around afterward, that could work. However, once you scroll around some, you'll still have a bunch of views, and the same problem you have now.

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Scrollviews exist and I happen to be using one.

True, but that doesn't necessarily means it's the best tool for the job. I tried something similar with my first Android project. I didn't know much about ListViews, and ended up rolling my own adapter that sounds eerily similar to what you're doing.

Long story short, the performance was bad. It did work, but once I(finally) switched to a ListView, the difference was nothing short of amazing. I'm just trying to keep others from going down that road. It was days of wasted time trying to get it "just right".