问题描述

CoordinatorLayout 在另一个 CoordinatorLayout 中，这样滚动子视图也应该滚动父 CoordinatorLayout.

CorodinatorLayout inside another CoordinatorLayout such that scrolling the child-view should also scroll the Parent CoordinatorLayout.

我有一个 coordinatorLayout 和 ViewPager 包含不同的 Fragment 这样 Scroll 将隐藏 tabLayout

I have a coordinatorLayout with ViewPager that contains different Fragment such that on Scroll will hide the tabLayout

我有另一个 coordinatorLayout 有一个 viewPager.这个fragment在父fragment的ViewPager中膨胀(父Coordinator layout).

I have another coordinatorLayout that has a viewPager. This fragment is inflated in ViewPager of parent fragment(parent Coordinator layout).

问题是 onScrolling childViewpager 中的子片段仅反映在子 fragment 的 coordinator layout 中，而不反映在父 coordinator layout 中，我需要隐藏 tablayout.

The problem is onScrolling the child fragment in childViewpager only reflects in coordinator layout of child fragment and not in the Parent coordinator layout that I need to do to hide the tablayout.

结构是:

CoordinatorLayout(p) ->(tablayout(p) & ViewPager(p) -> CoordinatorLayout(c)  ->(tablayout(c) & ViewPAger(c) ->recyclerView(cc)))

p -> parent;

c -> child; cc -> child to child

如何在滚动回收器视图上进行将同时影响 协调器布局，以便 工具栏 tablayout(p) 将被隐藏.

How to make on scrolling recycler view will affect both coordinator layout so that the toolbar tablayout(p) will be get hides.

推荐答案

我知道这是一个老问题.但是我搜索了很长时间以在片段中包含一个 CoordinatorLayout，该片段在另一个 CoordinatorLayout 中.

I know it's an old question. But I searched a long time to include an CoordinatorLayout in a fragment, which is in another CoordinatorLayout.

我稍微修改了 dev.bmax 的答案，调用两个协调器布局并调用两个布局的附加行为.

I modified the answer of dev.bmax a little bit to call both coordinator layouts and call the attached behaviors of both layouts.

所以这是我的解决方案.

So here is my solution.

@SuppressWarnings("unused")
public class NestedCoordinatorLayout extends CoordinatorLayout implements NestedScrollingChild {

    private NestedScrollingChildHelper mChildHelper;

    public NestedCoordinatorLayout(Context context) {
        super(context);
        mChildHelper = new NestedScrollingChildHelper(this);
        setNestedScrollingEnabled(true);
    }

    public NestedCoordinatorLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        mChildHelper = new NestedScrollingChildHelper(this);
        setNestedScrollingEnabled(true);
    }

    public NestedCoordinatorLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mChildHelper = new NestedScrollingChildHelper(this);
        setNestedScrollingEnabled(true);
    }

    @Override
    public boolean onStartNestedScroll(View child, View target, int     nestedScrollAxes) {
        /* Enable the scrolling behavior of our own children */
        boolean tHandled = super.onStartNestedScroll(child, target, nestedScrollAxes);
        /* Enable the scrolling behavior of the parent's other children  */
        return startNestedScroll(nestedScrollAxes) || tHandled;
    }

    @Override
    public void onStopNestedScroll(View target) {
        /* Disable the scrolling behavior of our own children */
        super.onStopNestedScroll(target);
        /* Disable the scrolling behavior of the parent's other children  */
        stopNestedScroll();
    }

    @Override
    public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
        int[][] tConsumed = new int[2][2];
        super.onNestedPreScroll(target, dx, dy, tConsumed[0]);
        dispatchNestedPreScroll(dx, dy, tConsumed[1], null);
        consumed[0] = tConsumed[0][0] + tConsumed[1][0];
        consumed[1] = tConsumed[0][1] + tConsumed[1][1];
    }

    @Override
    public void onNestedScroll(View target, int dxConsumed, int dyConsumed,
                           int dxUnconsumed, int dyUnconsumed) {
        super.onNestedScroll(target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed);
        dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, null);
    }

    @Override
    public boolean onNestedPreFling(View target, float velocityX, float velocityY) {
        boolean tHandled = super.onNestedPreFling(target, velocityX, velocityY);
        return dispatchNestedPreFling(velocityX, velocityY) || tHandled;
    }

    @Override
    public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) {
        boolean tHandled = super.onNestedFling(target, velocityX, velocityY, consumed);
        return dispatchNestedFling(velocityX, velocityY, consumed) || tHandled;
    }

    @Override
    public void setNestedScrollingEnabled(boolean enabled) {
        mChildHelper.setNestedScrollingEnabled(enabled);
    }

    @Override
    public boolean isNestedScrollingEnabled() {
        return mChildHelper.isNestedScrollingEnabled();
    }

    @Override
    public boolean startNestedScroll(int axes) {
        return mChildHelper.startNestedScroll(axes);
    }

    @Override
    public void stopNestedScroll() {
        mChildHelper.stopNestedScroll();
    }

    @Override
    public boolean hasNestedScrollingParent() {
        return mChildHelper.hasNestedScrollingParent();
    }

    @Override
    public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed,
                                    int dyUnconsumed, int[] offsetInWindow) {
        return mChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed,
                dyUnconsumed, offsetInWindow);
    }

    @Override
    public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) {
        return mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow);
    }

    @Override
    public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) {
        return mChildHelper.dispatchNestedFling(velocityX, velocityY, consumed);
    }

    @Override
    public boolean dispatchNestedPreFling(float velocityX, float velocityY) {
        return mChildHelper.dispatchNestedPreFling(velocityX, velocityY);
    }
}

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