堆栈与swiperefreshlayout与collapsingtoolbarlayout

Question

我希望将SwipeRefreshLayout放在包含CoordinatorLayout的{​​{1}}之外。当我向上滚动到顶部时，CollapsingToolbarLayout正常工作（折叠内部视图）。但我向下滚动，它没有扩展视图，它显示刷新图标刷新。 我怎么能向下滚动，它会扩展视图，然后刷新图标。

CollapsingToolbarLayout

Answer 1

您可以处理AppBarLayout

的监听器

public abstract class AppBarStateChangeListener implements AppBarLayout.OnOffsetChangedListener {

    public enum State {
        EXPANDED,
        COLLAPSED,
        IDLE
    }

    private State mCurrentState = State.IDLE;

    @Override
    public final void onOffsetChanged(AppBarLayout appBarLayout, int i) {
        if (i == 0) {
            if (mCurrentState != State.EXPANDED) {
                onStateChanged(appBarLayout, State.EXPANDED);
            }
            mCurrentState = State.EXPANDED;
        } else if (Math.abs(i) >= appBarLayout.getTotalScrollRange()) {
            if (mCurrentState != State.COLLAPSED) {
                onStateChanged(appBarLayout, State.COLLAPSED);
            }
            mCurrentState = State.COLLAPSED;
        } else {
            if (mCurrentState != State.IDLE) {
                onStateChanged(appBarLayout, State.IDLE);
            }
            mCurrentState = State.IDLE;
        }
    }

    public abstract void onStateChanged(AppBarLayout appBarLayout, State state);
}