Android 嵌套回收视图。如何防止在子RecyclerView滚动时父RecyclerView被滚动?
我正在尝试实现一个水平的Android 嵌套回收视图。如何防止在子RecyclerView滚动时父RecyclerView被滚动?,android,android-recyclerview,nestedrecyclerview,Android,Android Recyclerview,Nestedrecyclerview,我正在尝试实现一个水平的recyclerview,并且recyclerview的每个项目都将是一个垂直的recyclerview,具有网格布局。我面临的问题是,当我尝试垂直滚动子recyclerview时,有时父recyclerview会滚动并开始水平滚动。我试图解决这个问题的方法是 setNestedScrollingEnabled(false)在父级recyclerview 在子对象的recyclerview的onTouch()中,我通过调用RequestDisallowWinterCept
recyclerview
,并且recyclerview
的每个项目都将是一个垂直的recyclerview
,具有网格布局。我面临的问题是,当我尝试垂直滚动子recyclerview
时,有时父recyclerview
会滚动并开始水平滚动。我试图解决这个问题的方法是
setNestedScrollingEnabled(false)
在父级recyclerview
recyclerview
的onTouch()
中,我通过调用RequestDisallowWinterCeptTouchEvent(false)
上述解决方案都不能完美解决该问题。感谢您的帮助试试这个。对于我的用例,它已经起到了作用:
nestedRecyclerView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return true;
}
});
尝试下面的代码滚动内部回收视图
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IMO中,您可以在outer RecyclerView的适配器内尝试以下操作:
@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,您还可以尝试innerv.setOnScrollChangeListener
,因为setOnScrollListener
已被弃用
更新:
另一个选项是使用addOnScrollListener
而不是setOnScrollListener
希望有帮助
父recyclerview上的setNestedScrollingEnabled(false)
您可以在子RecyclerView(如果有)上尝试设置NestedScrollingEnabled(false)。RecyclerView的nestedscroll属性与子级类似(这就是为什么它实现了NestedScrollingChild
)
在子recyclerview的onTouch()中,我禁用了上的触摸事件
父recyclerview被调用
RequestDisallowWinterCeptTouchEvent(false)
这应该是可行的,但您应该做的是requestDisallowerWinterCeptTouchEvent(true)
,而不是false
。如果子类为RecyclerView,则可以重写onTouchEvent:
@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);
}
或者,有一个来自外部的触摸式听众
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);
}
});
我在一个类似的项目中通过对您(和这里的其他人)采取相反的方法解决了这个问题 我不是让孩子告诉家长什么时候停止看事件,而是让家长决定什么时候忽略(根据方向)。这种方法需要一个自定义视图,但这需要更多的工作。下面是我创建的用作外部/父视图的内容
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
}
}
使用此代码关闭滚动打开
recyclerview
:
recyclerView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return true;
}
});
childRecyclerView = (RecyclerView)itemView.findViewById(R.id.child_rv);
childRecyclerView.setLayoutManager(new CustomGridLayoutManager(context, 3));
childRecyclerView.setAdapter(new ChildAdapter()); // some adapter
像这样扩展自定义布局管理器
public class CustomLayoutManager extends LinearLayoutManager {
private boolean isScrollEnabled = true;
public CustomGridLayoutManager(Context context) {
super(context);
}
@Override
public boolean canScrollVertically() {
return false;
}
}
将布局管理器设置为“自定义布局管理器”您应该这样做:
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:
recycler.getParent().requestDisallowInterceptTouchEvent(true);
break;
case MotionEvent.ACTION_UP:
recycler.getParent().requestDisallowInterceptTouchEvent(false);
break;
case MotionEvent.ACTION_MOVE:
recycler.getParent().requestDisallowInterceptTouchEvent(true);
break;
}
}
@Override
public boolean onInterceptTouchEvent(RecyclerView recycler, MotionEvent event) {
return false;
}
});
希望这会对您有所帮助。现在您可以尝试
android:nestedScrollingEnabled
,因为Google使用nestedScrollingEnabled
修复了一个崩溃。请尝试下面的代码,希望它能起作用
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;
}
});
这个问题对我来说似乎很有趣。所以我试着去实现,这就是我所实现的(你也可以看到),非常顺利 因此,您可以尝试以下方法:
public class CustomLinearLayoutManager extends LinearLayoutManager {
public CustomLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
@Override
public boolean canScrollVertically() {
return false;
}
}
定义CustomLinearLayoutManager
扩展LinearLayoutManager
如下:
public class CustomLinearLayoutManager extends LinearLayoutManager {
public CustomLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
super(context, orientation, reverseLayout);
}
@Override
public boolean canScrollVertically() {
return false;
}
}
并将此CustomLinearLayoutManager
设置为您的家长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
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);
}
}
现在,对于childRecyclerView
,定义自定义CustomGridLayoutManager
扩展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;
}
}
并将其设置为layoutmanager
,以便子级RecyclerView
:
recyclerView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return true;
}
});
childRecyclerView = (RecyclerView)itemView.findViewById(R.id.child_rv);
childRecyclerView.setLayoutManager(new CustomGridLayoutManager(context, 3));
childRecyclerView.setAdapter(new ChildAdapter()); // some adapter
因此基本上,父级RecyclerView
只监听水平滚动,子级RecyclerView
只监听垂直滚动
除此之外,如果您还想处理对角滑动(垂直或水平方向都有一点倾斜),您可以在父视图中包含一个手势侦听器
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
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
为
class XScrollDetector extends GestureDetector.SimpleOnGestureListener {
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
return Math.abs(distanceY) < Math.abs(distanceX);
}
}
类XScrollDetector扩展了GestureDetector.SimpleOnGestureListener{
@凌驾
公共布尔onScroll(MotionEvent e1、MotionEvent e2、浮点距离X、浮点距离Y){
返回Math.abs(distanceY)因此,
ParentRecyclerView
要求子视图(在我们的示例中为VerticalRecyclerView)处理滚动事件。如果子视图处理,则父视图不执行任何其他操作。父视图最终处理滚动。将侦听器设置为嵌套的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);
这个问题存在于Android对RecyclerView的onInterceptTouchEvent()方法的实现中。 这个博客指出了这个问题,并解决了它-。
唯一的区别是父级垂直滚动,子级水平滚动。但是解决方案也会注意到它应该适合您的情况。我使用了单元格的卡片视图,并使用子单元格项目视图
setOnClickListener在子适配器中禁用了父回收器视图滚动
holder.itemView.setOnTouchListener { view, _ ->
view.parent.parent.requestDisallowInterceptTouchEvent(true)
false
}
我们正在调用view.parent.parent
,因为itemView
是一个单元格布局,它的父级是我们的子级recyclerView
,而且,我们需要联系子级recyclerView的父级以防止父级recyclerView
滚动。扩展线性布局是一个很好的建议。我几乎将整个实现更改为NestedScrollList。看起来这帮我省去了很多努力。惊人的答案,在我的例子中,我不需要使用整个解决方案,只需要SimpleNogestureListener部分,它工作得非常完美。谢谢,的确,当使用LinearLayoutManager
时,限制对角线滚动就足够了。不需要扩展LinearLayoutManager,因为显式禁用水平/垂直滚动,因为您可以看到/methods的实现已经在使用构造函数中提供的方向。如果在onInterceptTouchEvent中返回false,onTouchEvent永远不会被称为Hi