滚动时在NestedScrollView中隐藏FAB

我有一个nestedscrollview,内容像一些linearlayouts和textviews.我也出于某些原因使用了floatingactionbutton库.所以我不能使用任何行为.我不知道如何处理scrollviewlistener从scrollview隐藏并像动作一样动态显示fab.

有什么建议如何在滚动时隐藏和显示晶圆厂？

简单地将以下代码添加到NestedScrollView ScrollChangeListener:

NestedScrollView nsv = v.findViewById(R.id.nsv);
    nsv.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
        @Override
        public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
            if (scrollY > oldScrollY) {
                fab.hide();
            } else {
                fab.show();
            }
        }
    });

创建FabScrollBehavior类

public class FabScrollBehavior extends CoordinatorLayout.Behavior {
    private int toolbarHeight;

    public FabScrollBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.toolbarHeight = AppUtil.getToolbarHeight(context);
    }

    @Override
    public boolean layoutDependsOn(CoordinatorLayout parent, FloatingActionButton fab, View dependency) {
        return dependency instanceof AppBarLayout;
    }

    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionButton fab, View dependency) {
        if (dependency instanceof AppBarLayout) {
            CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
            int fabBottomMargin = lp.bottomMargin;
            int distanceToScroll = fab.getHeight() + fabBottomMargin;
            float ratio = (float)dependency.getY()/(float)toolbarHeight;
            fab.setTranslationY(-distanceToScroll * ratio);
        }
        return true;
    }
}

AppUtil.getToolbarHeight(context)的位置 -

public static int getToolbarHeight(Context context) {
        final TypedArray styledAttributes = context.getTheme().obtainStyledAttributes(
                new int[]{R.attr.actionBarSize});
        int toolbarHeight = (int) styledAttributes.getDimension(0, 0);
        styledAttributes.recycle();

        return toolbarHeight;
    }

然后在你的布局中添加到FloatingActionButton layout_behavior:

整个布局看起来像

从https://mzgreen.github.io/2015/02/15/How-to-hideshow-Toolbar-when-list-is-scroling(part1)/实施