小编xdb*_*bas的帖子

我为浮动操作按钮实现了一个简单的隐藏/显示行为.

调用onNestedScroll事件,直到在浮动操作按钮上调用hide()或setVisiblity(View.GONE),然后它停止对滚动事件做出反应.当fab的可见性变为GONE时,它似乎停止对滚动事件作出反应.

public class ScrollAwareFABBehavior extends FloatingActionButton.Behavior {

public ScrollAwareFABBehavior(Context context, AttributeSet attrs) {
    super(context, attrs);
}


@Override
public boolean onStartNestedScroll(final CoordinatorLayout coordinatorLayout,
                                   final FloatingActionButton child,
                                   final View directTargetChild, final View target,
                                   final int nestedScrollAxes) {

     return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL
            || super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes);
}

@Override
public void onNestedScroll(CoordinatorLayout coordinatorLayout, FloatingActionButton child,
                           View target, int dxConsumed, int dyConsumed, int dxUnconsumed,
                           int dyUnconsumed) {
    super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed,
            dyUnconsumed);

    if (dyConsumed > 0
            && child.getVisibility() == View.VISIBLE) …