因此，您可以试试像这样做：
public class CustomLinearLayoutManager extends LinearLayoutManager {
public CustomLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
@Override
public boolean canScrollVertically() {
return false;
}
}
将这个CustomLinearLayoutManager设置为您的父级RecyclerView。
RecyclerView parentRecyclerView = (RecyclerView)findViewById(R.id.parent_rv);
CustomLinearLayoutManager customLayoutManager = new CustomLinearLayoutManager(this, LinearLayoutManager.HORIZONTAL,false);
parentRecyclerView.setLayoutManager(customLayoutManager);
parentRecyclerView.setAdapter(new ParentAdapter(this)); // some adapter
现在为子RecyclerView，定义一个自定义的CustomGridLayoutManager，继承GridLayoutManager：
public class CustomGridLayoutManager extends GridLayoutManager {
public CustomGridLayoutManager(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
public CustomGridLayoutManager(Context context, int spanCount) {
super(context, spanCount);
}
public CustomGridLayoutManager(Context context, int spanCount, int orientation, boolean reverseLayout) {
super(context, spanCount, orientation, reverseLayout);
}
@Override
public boolean canScrollHorizontally() {
return false;
}
}
将其设置为子RecyclerView的layoutManager:
childRecyclerView = (RecyclerView)itemView.findViewById(R.id.child_rv);
childRecyclerView.setLayoutManager(new CustomGridLayoutManager(context, 3));
childRecyclerView.setAdapter(new ChildAdapter()); // some adapter
基本上，父 RecyclerView 只监听水平滚动，而子 RecyclerView 只监听垂直滚动。
另外，如果您还想处理对角线滑动（稍微倾斜于垂直或水平），您可以在 父 RecylerView 中包含手势侦听器。
public class ParentRecyclerView extends RecyclerView {
private GestureDetector mGestureDetector;
public ParentRecyclerView(Context context) {
super(context);
mGestureDetector = new GestureDetector(this.getContext(), new XScrollDetector());
// do the same in other constructors
}
// and override onInterceptTouchEvent
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return super.onInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev);
}
}
其中 XScrollDetector 是什么
class XScrollDetector extends GestureDetector.SimpleOnGestureListener {
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
return Math.abs(distanceY) < Math.abs(distanceX);
}
}
因此，ParentRecyclerView 会请求子视图（在我们的情况下为VerticalRecyclerView）来处理滚动事件。如果子视图处理，则父视图不做任何处理，否则最终父视图来处理滚动。
setNestedScrollingEnabled(false)，因为RecyclerView的嵌套滚动性质是作为子视图（这就是为什么它实现了NestedScrollingChild接口）。在子RecyclerView的onTouch()方法中，你可以通过调用requestDisallowInterceptTouchEvent(true)来禁用父RecyclerView的触摸事件，而不是false。如果你需要自定义RecyclerView，你可以重写onTouchEvent方法。@Override
public boolean onTouchEvent(MotionEvent event) {
if (MotionEventCompat.getActionMasked(event) == MotionEvent.ACTION_UP) {
// ensure we release the disallow request when the finger is lifted
getParent().requestDisallowInterceptTouchEvent(false);
} else {
getParent().requestDisallowInterceptTouchEvent(true);
}
// Call the super class to ensure touch handling
return super.onTouchEvent(event);
}
child.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (v.getId() == child.getId()) {
if (MotionEventCompat.getActionMasked(event) == MotionEvent.ACTION_UP) {
// ensure we release the disallow request when the finger is lifted
child.getParent().requestDisallowInterceptTouchEvent(false);
} else {
child.getParent().requestDisallowInterceptTouchEvent(true);
}
}
// Call the super class to ensure touch handling
return super.onTouchEvent(event);
}
});
我曾在一个类似的项目中解决了这个问题，方法与你（和其他人）截然不同。
与其让子元素告诉父元素何时停止查看事件，我让父元素根据方向来决定何时忽略它们。但这种方法需要自定义视图，稍微费点功夫。以下是我创建的作为外部/父级视图使用的代码。
public class DirectionalRecyclerView extends RecyclerView {
private static float LOCK_DIRECTION_THRESHOLD; //The slop
private float startX;
private float startY;
private LockDirection mLockDirection = null;
public DirectionalRecyclerView(Context context) {
super(context);
findThreshold(context);
}
public DirectionalRecyclerView(Context context, AttributeSet attrs) {
super(context, attrs);
findThreshold(context)
}
public DirectionalRecyclerView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
findThreshold(context);
}
private void findThreshold(Context context) {
//last number is number of dp to move before deciding that's a direction not a tap, you might want to tweak it
LOCK_DIRECTION_THRESHOLD = context.getResources().getDisplayMetrics().density * 12;
}
//events start at the top of the tree and then pass down to
//each child view until they reach where they were initiated
//unless the parent (this) method returns true for this visitor
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
startX = event.getX();
startY = event.getY();
break;
case MotionEvent.ACTION_MOVE:
if (mLockDirection == null) {
float currentX = event.getX();
float currentY = event.getY();
float diffX = Math.abs(currentX - startX);
float diffY = Math.abs(currentY - startY);
if (diffX > LOCK_DIRECTION_THRESHOLD) {
mLockDirection = LockDirection.HORIZONTAL;
} else if (diffY > LOCK_DIRECTION_THRESHOLD) {
mLockDirection = LockDirection.VERTICAL;
}
} else {
//we have locked a direction, check whether we intercept
//the future touches in this event chain
//(returning true steals children's events, otherwise we'll
// just let the event trickle down to the child as usual)
return mLockDirection == LockDirection.HORIZONTAL;
}
break;
case MotionEvent.ACTION_UP:
mLockDirection = null;
break;
}
//dispatch cancel, clicks etc. normally
return super.onInterceptTouchEvent(event);
}
private enum LockDirection {
HORIZONTAL,
VERTICAL
}
}
dispatchTouchEvent()中设置mLockDirection = null;，因为在onInterceptTouchEvent()和onTouchEvent()中并不总是被调用。 - WindRider将监听器设置为嵌套的RecyclerView
View.OnTouchListener listener = new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_MOVE
) {
v.getParent().requestDisallowInterceptTouchEvent(true);
} else {
v.getParent().requestDisallowInterceptTouchEvent(false);
}
return false;
}
};
mRecyclerView.setOnTouchListener(listener);
现在你可以尝试android:nestedScrollingEnabled了，因为Google解决了使用nestedScrollingEnabled时出现的崩溃问题 (问题编号197932)
试试这个。对于我的用例，它已经起作用：
nestedRecyclerView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return true;
}
});
尝试下面的代码，希望它能够工作。
nestedRecyclerView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
// Disallow parent to intercept touch events.
v.getParent().requestDisallowInterceptTouchEvent(true);
break;
case MotionEvent.ACTION_UP:
// Allow parent to intercept touch events.
v.getParent().requestDisallowInterceptTouchEvent(false);
break;
}
// Handle inner(child) touch events.
v.onTouchEvent(event);
return true;
}
});
我用卡片视图作为单元格，使用子单元格的 setOnClickListener 取消父级可滚动的子适配器。
holder.itemView.setOnTouchListener { view, _ ->
view.parent.parent.requestDisallowInterceptTouchEvent(true)
false
}
view.parent.parent 是因为 itemView 是一个单元格布局，它的父级是我们的子级 recyclerView，同时，我们需要到达子级 recyclerView 的父级以防止父级 recyclerView 滚动。innerRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
@Override
public void onTouchEvent(RecyclerView recycler, MotionEvent event) {
// Handle on touch events here
int action = event.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN:
// Disallow Parent RecyclerView to intercept touch events.
recycler.getParent().requestDisallowInterceptTouchEvent(true);
break;
case MotionEvent.ACTION_UP:
// Allow Parent RecyclerView to intercept touch events.
recycler.getParent().requestDisallowInterceptTouchEvent(false);
break;
}
}
@Override
public boolean onInterceptTouchEvent(RecyclerView recycler, MotionEvent event) {
return false;
}
});
在外部 RecyclerView 的 Adapter 中，你可以尝试以下操作：
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview, parent, false);
RVAdapter2 recyclerViewAdapter2 = new RVAdapter2();
RecyclerView innerRV = (RecyclerView) v.findViewById(R.id.rv2);
// Setup layout manager for items
LinearLayoutManager layoutManager2 = new LinearLayoutManager(parent.getContext());
// Control orientation of the items
layoutManager2.setOrientation(LinearLayoutManager.VERTICAL);
innerRV.setLayoutManager(layoutManager2);
innerRV.setAdapter(recyclerViewAdapter2);
innerRV.setOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
recyclerView.getParent().requestDisallowInterceptTouchEvent(true);
}
});
return new MyViewHolder(v);
}
对于API23，您也可以尝试使用innerRV.setOnScrollChangeListener，因为setOnScrollListener已被弃用。
另一个选项是使用addOnScrollListener而不是setOnScrollListener
希望这有所帮助！
LinearLayoutManager时，仅限制对角线滚动就足够了。 - Micha