android - smoothScrollToPosition 在嵌套的 RecyclerView 中不起作用
问题描述
我有一个 recyclerView,它的每个项目都是一个 recyclerView。我想在特定条件下滚动到内部 recyclerView 的自定义位置。我在 innerRecyclerView 使用了这段代码,但它没有用:
innerRecyclerView.smoothScrollToPosition(position);
和这个:
innerRecyclerView.scrollToPosition(position);
和这个:
layoutManager.scrollToPositionWithOffset(position, offset);
现在我有两个问题:
1)是否可以滚动到内部recyclerView的自定义位置?
2)如果可能的话,怎么做?
这里是初始化主recyclerView:
LinearLayoutManager layoutManager = new LinearLayoutManager(getContext(), RecyclerView.VERTICAL, false);
adapter = new FreightsListRVAdapter(new FreightListCallBack(), new FreightListVHFactory());
rvFreightsList.setLayoutManager(layoutManager);
rvFreightsList.setItemViewCacheSize(30);
rvFreightsList.setNestedScrollingEnabled(true);
rvFreightsList.setAdapter(adapter);
这里是初始化innerRecyclerview:
LinearLayoutManager layoutManager = new LinearLayoutManager(itemView.getContext(), RecyclerView.VERTICAL, false);
layoutManager.setItemPrefetchEnabled(true);
layoutManager.setInitialPrefetchItemCount(7);
rvFreights.setNestedScrollingEnabled(false);
rvFreights.setLayoutManager(layoutManager);
rvFreights.setItemViewCacheSize(20);
adapter = new FreightsRVAdapter(new FreightCallBack(), new FreightSingleVHFactory());
rvFreights.setAdapter(adapter);
这是我的主要 recyclerView 适配器:
public class FreightsListRVAdapter extends ListAdapter<FreightListModel, FreightListVH> {
private final FreightListVHFactory mFactory;
private final PublishSubject<FreightListVHAction> mClickUserPS = PublishSubject.create();
@Inject
public FreightsListRVAdapter(@NonNull FreightListCallBack diffCallback, FreightListVHFactory factory) {
super(diffCallback);
mFactory = factory;
}
@NonNull
@Override
public FreightListVH onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
return mFactory.create(parent);
}
@Override
public void onBindViewHolder(@NonNull FreightListVH holder, int position) {
holder.getVM().setObject(getItem(position));
holder.bind();
holder.itemOnClick(mClickUserPS);
}
public PublishSubject<FreightListVHAction> getmClickUserPS() {
return mClickUserPS;
}
}
下面是 mainRecyclerView 每一行的布局:
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat 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="wrap_content"
android:descendantFocusability="blocksDescendants"
android:orientation="vertical">
<androidx.appcompat.widget.AppCompatTextView 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/txtDescription"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:paddingTop="5dp"
android:paddingRight="10dp"
android:textColor="#992C2C2C"
android:textSize="11sp"
app:fontFamily="@font/iransans"
tools:ignore="HardcodedText,SmallSp" />
<androidx.appcompat.widget.AppCompatTextView
android:id="@+id/txtDate"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_marginLeft="15dp"
android:layout_marginRight="15dp"
android:layout_marginBottom="15dp"
android:gravity="right"
android:textColor="#2C2C2C"
android:textSize="20sp"
app:fontFamily="@font/iransans_medium"
tools:ignore="RtlHardcoded"/>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rvFreights"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:overScrollMode="never"
android:scrollbars="none" />
</androidx.appcompat.widget.LinearLayoutCompat>
解决方案
在 Kotlin-androidXrecyclerview
解决方案中
val parentViewHolder = parentRecyclerView?.findViewHolderForAdapterPosition(parentPosition) as? ParentViewHolder?
var childY = 0F
if (parentViewHolder != null)
childY = parentViewHolder.childRecyclerView?.getChildAt(lastPosition)?.y ?: 0F
parentRecyclerView.scrollBy(0, childY.toInt())
PrentViewHolder.kt
class PrentViewHolder(
view: InflateBinding
): RecyclerView.ViewHolder(view.root) {
var recyclerView: RecyclerView? = null
fun populateData(data: Data) {
viewDataBinding.recyclerview.adapter = adapter
recyclerView = viewDataBinding.recyclerview
}
}
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