在我的应用程序中，我遇到了必须在垂直RecyclerView中创建水平RecyclerView的情况。它们是一些将显示随意细节的行，在某些行中它将显示水平的RecyclerView。
我已将水平RecyclerView的高度设置为wrap_content，这是不可见的。但是当我为它添加了硬编码高度时，则可以看到RecyclerView。我已经对这个问题进行了很多搜索，但我没有找到任何有效或有说服力的解决方案。
这是我的适配器类
public class HomeRVAdapter extends RecyclerView.Adapter<HomeRVAdapter.HomeViewHolder> {
private ArrayList<LinkedHashMap<String, Object>> data;
private Context ctx;
private int selectedIndex;
public HomeRVAdapter(Context ctx, ArrayList<LinkedHashMap<String, Object>> val) {
data = val;
this.ctx = ctx;
selectedIndex = -1;
}
@Override
public HomeViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = ((Activity) ctx).getLayoutInflater();
View view = inflater.inflate(R.layout.custom_home_recycler, null);
return new HomeViewHolder(view);
}
@Override
public int getItemCount() {
return data.size();
}
@Override
public void onBindViewHolder(final HomeViewHolder holder, final int position) {
if (getItemCount() == position+1) {
holder.categoryLL.setVisibility(View.GONE);
holder.productLL.setVisibility(View.VISIBLE);
LinearLayoutManager manager = new LinearLayoutManager(ctx);
manager.setOrientation(LinearLayoutManager.HORIZONTAL);
ArrayList<SubCategoryDetails> list = new ArrayList<>();
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
holder.subCatRV.setAdapter(new PromoProductAdapter(list, holder.subCatRV));
holder.subCatRV.setLayoutManager(manager);
} else {
holder.categoryLL.setVisibility(View.VISIBLE);
holder.productLL.setVisibility(View.GONE);
if (selectedIndex == position) {
holder.subCatGrid.setVisibility(View.VISIBLE);
showGrid(holder);
} else {
holder.subCatGrid.setVisibility(View.GONE);
}
holder.catTR.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (selectedIndex == position) {
holder.subCatGrid.setVisibility(View.GONE);
selectedIndex = -1;
} else {
selectedIndex = position;
showGrid(holder);
}
}
});
}
}
private void showGrid(HomeViewHolder holder) {
ArrayList<SubCategoryDetails> list = new ArrayList<>();
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
list.add(new SubCategoryDetails());
SubCategoryGridAdapter adapter = new SubCategoryGridAdapter(list);
holder.subCatGrid.setAdapter(adapter);
holder.subCatGrid.setVisibility(View.VISIBLE);
}
class HomeViewHolder extends RecyclerView.ViewHolder {
RecyclerView subCatRV;
TextView catTitleTV, productNameTV;
ImageView productIV;
NonScrollableGridView subCatGrid;
LinearLayout categoryLL, productLL;
TableRow catTR;
public HomeViewHolder(View view) {
super(view);
subCatRV = (RecyclerView) view.findViewById(R.id.subCatRV);
productNameTV = (TextView) view.findViewById(R.id.productNameTV);
catTitleTV = (TextView) view.findViewById(R.id.catTitleTV);
productIV = (ImageView) view.findViewById(R.id.productIV);
subCatGrid = (NonScrollableGridView) view.findViewById(R.id.subCatGrid);
categoryLL = (LinearLayout) view.findViewById(R.id.categoryLL);
productLL = (LinearLayout) view.findViewById(R.id.productLL);
catTR = (TableRow) view.findViewById(R.id.catTR);
}
}
class SubCategoryGridAdapter extends BaseAdapter {
ArrayList<SubCategoryDetails> subCatData;
public SubCategoryGridAdapter(ArrayList<SubCategoryDetails> subCatData){
this.subCatData = subCatData;
}
@Override
public int getCount() {
return subCatData.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = ((Activity) ctx).getLayoutInflater().inflate(R.layout.custom_sub_cat_grid, null, true);
}
return convertView;
}
@Override
public long getItemId(int position) {
return 0;
}
}
class PromoProductAdapter extends RecyclerView.Adapter<PromoProductAdapter.PromoHolder> {
ArrayList<SubCategoryDetails> data;
RecyclerView horizontalRV;
public PromoProductAdapter(ArrayList<SubCategoryDetails> data, RecyclerView horizontalRV){
this.data = data;
this.horizontalRV = horizontalRV;
}
@Override
public PromoHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = ((Activity) ctx).getLayoutInflater();
View view = inflater.inflate(R.layout.custom_promoted_product, null);
if (horizontalRV != null) {
int height = view.getMeasuredHeight();
horizontalRV.getLayoutParams().height = height;
}
return new PromoHolder(view);
}
@Override
public int getItemCount() {
return data.size();
}
@Override
public void onBindViewHolder(PromoHolder holder, int position) {
}
class PromoHolder extends RecyclerView.ViewHolder {
public PromoHolder(View view) {
super(view);
}
}
}
}
请帮我解决这个问题。
答案 0 :(得分：1)
我自己解决了这个问题。我使用了从link找到的自定义LinearLayoutManager。
public class MyLinearLayoutManager extends LinearLayoutManager {
public MyLinearLayoutManager(Context context) {
super(context);
}
private int[] mMeasuredDimension = new int[2];
@Override
public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state,
int widthSpec, int heightSpec) {
final int widthMode = View.MeasureSpec.getMode(widthSpec);
final int heightMode = View.MeasureSpec.getMode(heightSpec);
final int widthSize = View.MeasureSpec.getSize(widthSpec);
final int heightSize = View.MeasureSpec.getSize(heightSpec);
measureScrapChild(recycler, 0,
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
mMeasuredDimension);
int width = mMeasuredDimension[0];
int height = mMeasuredDimension[1];
switch (widthMode) {
case View.MeasureSpec.EXACTLY:
case View.MeasureSpec.AT_MOST:
width = widthSize;
break;
case View.MeasureSpec.UNSPECIFIED:
}
switch (heightMode) {
case View.MeasureSpec.EXACTLY:
case View.MeasureSpec.AT_MOST:
height = heightSize;
break;
case View.MeasureSpec.UNSPECIFIED:
}
setMeasuredDimension(width, height);
}
private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
int heightSpec, int[] measuredDimension) {
View view = recycler.getViewForPosition(position);
if (view != null) {
RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();
int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec,
getPaddingLeft() + getPaddingRight(), p.width);
int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
getPaddingTop() + getPaddingBottom(), p.height);
view.measure(childWidthSpec, childHeightSpec);
measuredDimension[0] = view.getMeasuredWidth();
measuredDimension[1] = view.getMeasuredHeight();
recycler.recycleView(view);
}
}}
只需将此LinearLayoutManager添加到您的RecyclerView即可。
谢谢大家 干杯!!!
答案 1 :(得分：1)
更简单的解决方案可以是保持高度硬编码（因为它是水平视图，高度可以保持固定），然后如果输入为空则隐藏水平回收器视图。
if(list.size() == 0){
horizontalRecyclerView.setVisibility(View.GONE);
}