如何在父级RecyclerView中使用ListView/RecyclerView？

Question

我想添加一些子视图(列表项),它们来自JSON格式的数据.每个子列表都在父列表项行下.如何RecyclerView为每个行项(包含子列表项的父项)填充它？

我尝试RecyclerView在RecyclerView父行中使用(用于填充子列表),但此处子视图不可见.

父适配器类

public class DigitizedPrescAdapter extends RecyclerView.Adapter<DigitizedPrescAdapter.ListItemViewHolder>{
    private List<PrescriptionModal> prescriptionList;

    MedicinesInPrescAdapter adapter;

    public DigitizedPrescAdapter(List<PrescriptionModal> prescriptionListModal) {

        if (prescriptionListModal == null) {
            throw new IllegalArgumentException(
                    "PrescriptionList must not be null");
        }
        this.prescriptionList = prescriptionListModal;
    }

    @Override
    public ListItemViewHolder onCreateViewHolder(
            ViewGroup viewGroup, int viewType) {
        View itemView = LayoutInflater.
                from(viewGroup.getContext()).
                inflate(R.layout.item_row_digitised_request,
                        viewGroup,
                        false);
        return new ListItemViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(
            ListItemViewHolder viewHolder, int position) {
        PrescriptionModal model = prescriptionList.get(position);

        viewHolder.prescnum.setText("Prescription "+ ++position);
        viewHolder.prescNo.setText("Prescription: "+model.getPrescriptionID());
        viewHolder.doctorType.setText("Type: "+model.getDoctorType());
        viewHolder.doctorName.setText("Doctor: "+model.getDoctorName());
        viewHolder.patientName.setText("Patient: "+model.getPatientName());

        adapter = new MedicinesInPrescAdapter(model.getLstproduct());
        viewHolder.lstMedicines.setAdapter(adapter);

    }

    @Override
    public int getItemCount() {
        return prescriptionList.size();
    }

    public final static class ListItemViewHolder
            extends RecyclerView.ViewHolder {

        TextView prescnum;
        TextView prescNo;
        TextView doctorType;
        TextView patientName;
        TextView doctorName;
        CheckBox selectAll;
        RecyclerView lstMedicines;

        public ListItemViewHolder(View itemView) {
            super(itemView);
            prescnum = (TextView) itemView.findViewById(R.id.prescnum);
            prescNo = (TextView) itemView.findViewById(R.id.prescNo);
            doctorType = (TextView) itemView.findViewById(R.id.doctorType);
            patientName = (TextView) itemView.findViewById(R.id.patientName);
            doctorName = (TextView) itemView.findViewById(R.id.doctorName);
            selectAll = (CheckBox) itemView.findViewById(R.id.selectAll);
            lstMedicines = (RecyclerView) itemView.findViewById(R.id.lstAllMedicines);
            MyLinearLayoutManager layoutManager = new MyLinearLayoutManager(itemView.getContext(),LinearLayoutManager.VERTICAL,false);
            lstMedicines.setHasFixedSize(false);
            lstMedicines.setLayoutManager(layoutManager);
        }
    }
}

子适配器类

public class MedicinesInPrescAdapter extends RecyclerView.Adapter<MedicinesInPrescAdapter.MedicineListItemViewHolder>{

    List<Modal_Product_List> prescriptionProducts;

    public MedicinesInPrescAdapter(List<Modal_Product_List> prescriptionListProd) {

        if (prescriptionListProd == null) {
            throw new IllegalArgumentException(
                    "PrescriptionProductList must not be null");
        }
        this.prescriptionProducts = prescriptionListProd;
    }

    @Override
    public MedicineListItemViewHolder onCreateViewHolder(
            ViewGroup viewGroup, int viewType) {
        View itemView = LayoutInflater.
                from(viewGroup.getContext()).
                inflate(R.layout.item_row_medicine_productlist,
                        viewGroup,
                        false);
        return new MedicineListItemViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(
            MedicineListItemViewHolder viewHolder, int position) {
        Modal_Product_List modelMedicine = prescriptionProducts.get(position);

        viewHolder.medicineName.setText(modelMedicine.getMedicinename());
        viewHolder.medQty.setText(modelMedicine.getQuantity());
        viewHolder.days.setText("30");
        viewHolder.Amount.setText(modelMedicine.getQuantitybasedprice());
    }

    @Override
    public int getItemCount() {
        return prescriptionProducts.size();
    }

    public final static class MedicineListItemViewHolder
            extends RecyclerView.ViewHolder {

        TextView medicineName;
        EditText medQty;
        TextView days;
        TextView Amount;
        CheckBox selectMe;

        public MedicineListItemViewHolder(View itemView) {
            super(itemView);
            medicineName = (TextView) itemView.findViewById(R.id.medicineName);
            medQty = (EditText) itemView.findViewById(R.id.medQty);
            days = (TextView) itemView.findViewById(R.id.days);
            Amount = (TextView) itemView.findViewById(R.id.amount);
            selectMe = (CheckBox) itemView.findViewById(R.id.selectMe);
        }
    }
}

Answer 1

几天前我得到了这个问题并最终解决了.您所要做的就是@override布局管理器onMeasure函数如下:

CustomLinearLayoutManager

public class CustomLinearLayoutManager extends LinearLayoutManager {

    private static final String TAG = CustomLinearLayoutManager.class.getSimpleName();

    public CustomLinearLayoutManager(Context context) {
        super(context);
    }

    public CustomLinearLayoutManager(Context context, int orientation, boolean reverseLayout) {
        super(context, orientation, reverseLayout);
    }

    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);

        int width = 0;
        int height = 0;
        for (int i = 0; i < getItemCount(); i++) {
            measureScrapChild(recycler, i, View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
                mMeasuredDimension);


            if (getOrientation() == HORIZONTAL) {
                width = width + mMeasuredDimension[0];
                if (i == 0) {
                    height = mMeasuredDimension[1];
                }
            } else {
                height = height + mMeasuredDimension[1];
                if (i == 0) {
                    width = mMeasuredDimension[0];
                }
            }
        }
        switch (widthMode) {
            case View.MeasureSpec.EXACTLY:
                width = widthSize;
            case View.MeasureSpec.AT_MOST:
            case View.MeasureSpec.UNSPECIFIED:
        }

        switch (heightMode) {
            case View.MeasureSpec.EXACTLY:
                height = heightSize;
            case View.MeasureSpec.AT_MOST:
            case View.MeasureSpec.UNSPECIFIED:
        }

        setMeasuredDimension(width, height);
    }

    private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec,
                               int heightSpec, int[] measuredDimension) {
        try {
            View view = recycler.getViewForPosition(0);//fix IndexOutOfBoundsException

            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() + p.leftMargin + p.rightMargin;
                measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;
                recycler.recycleView(view);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } 
    }
}

您可以像上面那样复制并通过自定义布局管理器,并在父适配器中设置您的recyclerview,如下所示:

RecyclerView.LayoutManager layoutManager = new CustomLinearLayoutManager(mContext);
holder.childRecyclerView.setLayoutManager(layoutManager);

切记:不要使用相同的layoutManager作为父适配器,否则会发生错误.

Answer 2

如果我理解,你想要一个带有RecyclerView行的RecyclerView.在这种情况下,我建议您使用此lib来使用可扩展的RecyclerView.只需按照链接中的可扩展示例操作即可.

同一个库中有许多很酷的功能,比如Drag and Drop,Swipeable行......观看这个不到一分钟的示例视频.

您只需将lib添加到gradle.build文件中的依赖项,如下所示:

dependencies {
    compile 'com.h6ah4i.android.widget.advrecyclerview:advrecyclerview:0.7.4'
}

能够import在你的java文件中的lib.

Answer 3

通过Android支持库23.2的支持库版本23.2.0.所以一切都WRAP_CONTENT应该正常工作.

请在gradle文件中更新库的版本.

compile 'com.android.support:recyclerview-v7:23.2.0'

这允许RecyclerView基于其内容的大小来自我调整大小.这意味着以前不可用的场景,例如WRAP_CONTENT用于维度RecyclerView,现在是可能的.您会发现所有内置的LayoutManagers现在都支持自动测量.

你将被要求打电话 setAutoMeasureEnabled(true)

下面是示例代码

RecyclerView.LayoutManager layout = new LinearLayoutManager(context); 
layout.setAutoMeasureEnabled(true);

如setAutoMeasureEnabled已被弃用替代的解决方案将该方法在API级别27.1.0弃用.实现者LayoutManager应该通过覆盖来定义它是否使用AutoMeasure isAutoMeasureEnabled().