Hi, I am creating a scrolling panel with many child views (e.g.
buttons). Each child view has a fixed location based on their row and
column index. I cannot create them at the beginning since there are
tons of them and I will run out of memory, so I'd like to only add a
child view when it intersects with the screen view port (when users
scrolls to that area). I override the onLayout() method with something
like this:
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
for (int row = 0; row < ROW_NUM; row++) {
ColumnAdapter columnAdapter = mRowAdapter.getItem(row);
for (int col = 0; col < COLUMN_NUM; col++) {
ItemView itemView = columnAdapter.getView(col, null,
this);
if (isOnScreen(row, col)) {
itemView.layout(col * 100, row * 100, (col + 1) * 100,
(row + 1) * 100);
addViewInLayout(itemView, row + col, null, true);
}
}
}
scrollTo(getScrollX(), getScrollY());
}
(ColumnAdapter is an Adapter extension and ItemView is button
extension). This wouldn't work because onLayout() is not called during
scrolling. What should I do to add ItemViews dynamically as user
scrolls?
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