1
我已經實現了一個嵌套的ReyclerView（水平垂直），我不想爲包裝在CardView元素中的整個行添加一個點擊偵聽器。嵌套的RecyclerView onClickListener不工作
我遇到的問題是裏面的RecyclerView捕獲所有的觸摸事件，而根CardView沒有響應onClick事件。
我也試過讓CardView攔截觸摸事件，但是用這種方法漣漪效應（實際上任何反饋）都不起作用。
有人可以推薦一個解決方案，如何在嵌套RecyclerView的同時在一行上實現點擊監聽器？
謝謝。
--LE--
這是當前實現：
片段佈局
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/list"
android:name=".NestedRecyclerViewsFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layoutManager="LinearLayoutManager"
tools:context=".NestedRecyclerViewsFragment"
tools:listitem="@layout/fragment_nested_recyclerview_item"
/>
片段onCreateView（）實現
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_nested_recyclerview_list, container, false);
// Set the adapter
if (view instanceof RecyclerView) {
Context context = view.getContext();
RecyclerView recyclerView = (RecyclerView) view;
recyclerView.setLayoutManager(new LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false));
recyclerView.setHasFixedSize(true); // Improves performance - as we know the size doesn't change
//Initialize and set the adapter
mAdapter = new RootAdapter(context, mListener);
recyclerView.setAdapter(mAdapter);
final GestureDetector mGestureDetector =
new GestureDetector(view.getContext(), new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
recyclerView.addOnItemTouchListener(new RecyclerView.SimpleOnItemTouchListener() {
//TODO: intercept simple gestures like onClick and/or onLongClick
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if (child != null && mGestureDetector.onTouchEvent(e)) {
//TODO: handle the intercept??
child.callOnClick();
return true;
}
return super.onInterceptTouchEvent(rv, e);
}
});
recyclerView.setNestedScrollingEnabled(true);
}
return view;
}
**根適配器佈局**
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="@dimen/row_height"
android:layout_gravity="center_horizontal"
android:layout_margin="@dimen/none"
android:padding="@dimen/none"
app:cardCornerRadius="@dimen/none"
tools:context=".NestedRecyclerViewActivity"
<!-- Simple selector for API < 21 and ripple effect for APi >= 21 -->
android:foreground="@drawable/selector_default"
android:clickable="true"
android:focusable="true"
>
<!-- Horizontal image gallery inside row item -->
<android.support.v7.widget.RecyclerView
android:id="@+id/child_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
...
</android.support.v7.widget.CardView>
根適配器onBindView（）實現：
...
holder.childRecyclerView.setLayoutManager(new LinearLayoutManager(holder.mView.getContext(),
LinearLayoutManager.HORIZONTAL, false));
holder.childRecyclerView.setHasFixedSize(true); // We know the image don't change size
holder.childRecyclerView.setAdapter(new ChildAdapter(items));
...
根適配器ViewHolder實現：
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private ItemClickListener mClickListener;
/**
* The whole view - useful if you need to place some touch listener on the entire row.
*/
public final View mView;
/**
* The model associated with this view. - will be updated on bind method
*/
public Object mItem;
@Bind(R.id.child_recycler_view)
RecyclerView childRecyclerView;
...
public ViewHolder(View view) {
super(view);
ButterKnife.bind(this, view);
mView = view;
mView.setOnClickListener(this);
// Set the click listener bound to the fragment or activity
mClickListener = RootAdapter.this;
}
@Override
public void onClick(View v) {
if (null != mClickListener) {
mClickListener.onClick(v, getAdapterPosition());
}
}
}
內RecyclerView （孩子）是一個非常簡單和標準的實現，沒有任何聽衆設置它。
儘管此解決方案有效，並且我得到了單擊事件和內部RecyclerView滾動工作，但我遇到了未顯示點擊反饋的問題。
LE：解決方案
我的需求變化不大，因爲我張貼了這個問題，其與PagerAdapter更換內RecyclerView，但我實現瞭解決方案應該與嵌套RecyclerView也行。
基本上我用一個自定義的ItemClickSupport類，將盡快爲他們被截獲通過單擊事件回父：
/**
* Utility class which adds the ability to add Click Support for RecyclerViews without the need to implement click
* listeners into the adapter or in the ViewHolder's implementation.
* <p>
* Use it by simply binding an click listener to the desired RecyclerView.
* <pre><code>
* ItemClickSupport.addTo(mRecyclerView).setOnItemClickListener(new ItemClickSupport.OnItemClickListener() {
* {@[email protected]}Override
* public void onItemClicked(RecyclerView recyclerView, int position, View v) {
* // Handle the clicked item
* }
* });
* </code></pre>
* </p>
* Based on <a href="http://www.littlerobots.nl/blog/Handle-Android-RecyclerView-Clicks/">Handle-Android-RecyclerView
* -Clicks</a>, <br/><b>Hugo Visser</b>. Which is very similar with the implementation from <a
* href="https://github.com/lucasr/twoway-view">TwoWay-View</a>.
* <p/>
* Created by ionut on 22.03.2016.
*/
public class ItemClickSupport {
private final RecyclerView mRecyclerView;
private OnItemClickListener mOnItemClickListener;
private OnItemLongClickListener mOnItemLongClickListener;
private View.OnClickListener mOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mOnItemClickListener != null) {
RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
mOnItemClickListener.onItemClicked(mRecyclerView, holder.getAdapterPosition(), v);
}
}
};
private View.OnLongClickListener mOnLongClickListener = new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
if (mOnItemLongClickListener != null) {
RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
return mOnItemLongClickListener.onItemLongClicked(mRecyclerView, holder.getAdapterPosition(), v);
}
return false;
}
};
private RecyclerView.OnChildAttachStateChangeListener mAttachListener =
new RecyclerView.OnChildAttachStateChangeListener() {
@Override
public void onChildViewAttachedToWindow(View view) {
if (mOnItemClickListener != null) {
view.setOnClickListener(mOnClickListener);
}
if (mOnItemLongClickListener != null) {
view.setOnLongClickListener(mOnLongClickListener);
}
}
@Override
public void onChildViewDetachedFromWindow(View view) {
}
};
private ItemClickSupport(RecyclerView recyclerView) {
mRecyclerView = recyclerView;
mRecyclerView.setTag(R.id.item_click_support, this);
mRecyclerView.addOnChildAttachStateChangeListener(mAttachListener);
}
public static ItemClickSupport addTo(RecyclerView view) {
ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
if (support == null) {
support = new ItemClickSupport(view);
}
return support;
}
public static ItemClickSupport removeFrom(RecyclerView view) {
ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
if (support != null) {
support.detach(view);
}
return support;
}
public ItemClickSupport setOnItemClickListener(OnItemClickListener listener) {
mOnItemClickListener = listener;
return this;
}
public ItemClickSupport setOnItemLongClickListener(OnItemLongClickListener listener) {
mOnItemLongClickListener = listener;
return this;
}
private void detach(RecyclerView view) {
view.removeOnChildAttachStateChangeListener(mAttachListener);
view.setTag(R.id.item_click_support, null);
}
public interface OnItemClickListener {
void onItemClicked(RecyclerView recyclerView, int position, View v);
void onItemClicked(int position);
}
public interface OnItemLongClickListener {
boolean onItemLongClicked(RecyclerView recyclerView, int position, View v);
}
public static class SimpleOnItemClickListener implements OnItemClickListener {
@Override
public void onItemClicked(int position) {
}
@Override
public void onItemClicked(RecyclerView recyclerView, int position, View v) {
}
}
}
當創建根適配器，我設置的項目點擊收聽它，像這樣：
ItemClickSupport.addTo(mRecyclerView).setOnItemClickListener(this);
而且我還通過setter方法發送該偵聽器內轉接器，像這樣：
rootAdapter.setOnItemClickListener(this);
rootAdapter是根適配器，而this是我所在的當前片段，它實現了ItemClickSupportListener。
在根適配器，結合項目和創建內部適配器時，我通過對項目點擊支持監聽器內轉接，像這樣：
innerAdapter.setOnItemClickListener(new ItemClickSupport.SimpleOnItemClickListener() {
@Override
public void onItemClicked(int position) {
// Here we pass the click to the parent provided click listener.
// We modify the position with the one of the ViewHolder so that we don't get the
// position of the horizontal RecyclerView adapter - we are interested on the
// vertical item actually.
if (null != mItemClickListener) {
mItemClickListener.onItemClicked(holder.getAdapterPosition());
}
}
});
mItemClickListener實際上是監聽器通過設定通過上面描述的setter方法片段化。
在內部適配器，在創建視圖時，我設置了點擊監聽器佈局的根，我膨脹，並通過該事件回到我的自定義點擊收聽：
// Detect the click events and pass them to any listeners
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (null != mOnItemClickListener) {
mOnItemClickListener.onItemClicked(position);
}
}
});
mOnItemClickListener實際上是項目點擊由上述適配器傳遞的支持。
另一個重要的事情是使用的FrameLayout爲適配器項目視圖的內容，例如：
<FrameLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:addStatesFromChildren="true"
android:foreground="@drawable/selector_default"
>
這裏最重要的是將使用的選擇和國旗android:addStatesFromChildren。這是爲根適配器項目設置的。
內適配器項目也應該使用的FrameLayout作爲內容視圖，這樣我們也可以用前景色屬性設置它的選擇：
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:foreground="@drawable/selector_default"
>
這是必要的，因爲當內轉接項目將捕捉到的點擊事件，選擇器被激活，否則父母應該對點擊事件作出反應並激活它的選擇器。
嘗試在適配器上點擊監聽器設置爲視圖。 – Irfan
由於在onBindViewHolder（）方法中創建了子RecyclerView，這也意味着我將不得不爲每個水平行項目創建一個偵聽器。 此外，我不認爲它會解決CardView選擇器不再工作的問題。 –
現在你在哪裏設置onClickListener？ – Irfan