如何以编程方式将 CardView 添加到 RecyclerView 中的 LinearLayout

Question

是否可以在RecyclerView 内以编程方式将CardView 添加到LinearLayout。目前，所有CardViews 都添加到RecyclerView，但我希望将屏幕截图中的那些添加到LinearLayout。

片段类

public class TabFragmentRV extends android.support.v4.app.Fragment {
    RecyclerView mRecyclerView;

    public TabFragmentRV() {}

    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_rv, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        View v = getView();
        assert v != null;

        mRecyclerView = v.findViewById(R.id.my_recyclerview);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));

        super.onActivityCreated(savedInstanceState);

        initRVAdapter();
    }

    private void initRVAdapter(){
        List<Object> itemsList = new ArrayList<>();

        RVItemsAapter itemsListAdapter = new RVItemsAapter(getContext());
        mRecyclerView.setAdapter(itemsListAdapter);

        itemsList.add(new RVLineSeparator());
        itemsList.add(new SectionHeader("Section E"));
        itemsList.add(new SMSmessage("Item E1","Item E1 description"));
        itemsList.add(new SMSmessage("Item E2","Item E2 description"));
        itemsList.add(new SMSmessage("Item E3","Item E3 description"));
        itemsList.add(new SMSmessage("Item E4","Item E4 description"));
        itemsList.add(new RVLineSeparator());

        itemsListAdapter.setCallSMSFeed(itemsList);
        itemsListAdapter.notifyDataSetChanged();
    }
}

适配器类

public class RVItemsAapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private final static int TYPE_MAINHEADER = 1, TYPE_EXPANDABLE = 2, TYPE_NONEXPANDABLE = 3, TYPE_SECTIONHEADER = 4, TYPE_TABLE = 5, TYPE_SEPARATOR = 6;
    private ArrayList callSMSFeed = new ArrayList();

    private Context context;


    public RVItemsAapter(Context context){this.context=context;}

    public void setCallSMSFeed(List<Object> callSMSFeed){
        this.callSMSFeed = (ArrayList) callSMSFeed;
    }

    @Override
    public int getItemViewType(int position) {
        if (callSMSFeed.get(position) instanceof MainHeader) {
            return TYPE_MAINHEADER;
        } else if (callSMSFeed.get(position) instanceof Phonecall) {
            return TYPE_EXPANDABLE;
        } else if (callSMSFeed.get(position) instanceof SMSmessage) {
            return TYPE_NONEXPANDABLE;
        } else if (callSMSFeed.get(position) instanceof SectionHeader) {
            return TYPE_SECTIONHEADER;
        } else if (callSMSFeed.get(position) instanceof MyTable) {
            return TYPE_TABLE;
        } else if (callSMSFeed.get(position) instanceof RVLineSeparator) {
            return TYPE_SEPARATOR;
        }
        throw new IllegalArgumentException("Item at position " + position + " is not an instance of either Phonecall or SMSmessage");
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        int viewType=holder.getItemViewType();
        switch (viewType){
            case TYPE_MAINHEADER:
                MainHeader mainHeader = (MainHeader) callSMSFeed.get(position);
                ((MHeaderViewHolder)holder).showMHeaderDetails(mainHeader);
                break;
            case TYPE_EXPANDABLE:
                Phonecall call = (Phonecall) callSMSFeed.get(position);
                ((CallViewHolder)holder).showCallDetails(call);
                break;
            case TYPE_NONEXPANDABLE:
                SMSmessage sms = (SMSmessage) callSMSFeed.get(position);
                ((SMSViewHolder)holder).showSmsDetails(sms);
                break;
            case TYPE_SECTIONHEADER:
                SectionHeader sectionHeader = (SectionHeader) callSMSFeed.get(position);
                ((SectionViewHolder)holder).showSectionDetails(sectionHeader);
                break;
            case TYPE_TABLE:
                TableToilets tblToilets = (TableToilets) callSMSFeed.get(position);
                ((TblViewHolder)holder).showTblDetails(tblToilets);
                break;
            case TYPE_SEPARATOR:
                ((SeparatorViewHolder)holder).showSeparatorDetails();
                break;
            default:
                throw new IllegalArgumentException("unexpected viewType: " + viewType);
        }
    }

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

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {


        int layout;
        RecyclerView.ViewHolder viewHolder;
        switch (viewType){
            case TYPE_MAINHEADER:
                layout = R.layout.rv_header;
                View mainheaderView = LayoutInflater
                        .from(parent.getContext())
                        .inflate(layout, parent, false);
                viewHolder = new MHeaderViewHolder(mainheaderView);
                break;
            case TYPE_EXPANDABLE:
                layout = R.layout.cardview_dualline_withexpandability;
                View callsView = LayoutInflater
                        .from(parent.getContext())
                        .inflate(layout, parent, false);
                viewHolder = new CallViewHolder(callsView);
                break;
            case TYPE_NONEXPANDABLE:
                layout = R.layout.cardview_dualline_sansexpandability;
                View smsView = LayoutInflater
                        .from(parent.getContext())
                        .inflate(layout, parent, false);
                viewHolder = new SMSViewHolder(smsView);
                break;
            case TYPE_SECTIONHEADER:
                layout = R.layout.sectionheaderforrecyclerview;
                View sectionheaderView = LayoutInflater
                        .from(parent.getContext())
                        .inflate(layout, parent, false);
                viewHolder = new SectionViewHolder(sectionheaderView);
                break;
            case TYPE_TABLE:
                layout = R.layout.cardview_tableview_withexpandability;
                View tblView = LayoutInflater
                        .from(parent.getContext())
                        .inflate(layout, parent, false);
                viewHolder = new TblViewHolder(tblView);
                break;
            case TYPE_SEPARATOR:
                layout = R.layout.lineseparatorforrecyclerview;
                View separatorView = LayoutInflater
                        .from(parent.getContext())
                        .inflate(layout, parent, false);
                viewHolder = new SeparatorViewHolder(separatorView);
                break;
            default:
                throw new IllegalArgumentException("unexpected viewType: " + viewType);
        }
        return viewHolder;
    }

    // First ViewHolder of object type Call
    // Reference to the views for each call items to display desired information
    public class CallViewHolder extends RecyclerView.ViewHolder {
        final Typeface iconFont = FontManager.getTypeface(context, FontManager.FONTAWESOME);

        private TextView arrowexpandcollapseTextView, callerNameTextView, callTimeTextView;
        private LinearLayout llFacilityInformation;

        CallViewHolder(View itemView) {
            super(itemView);
            // Initiate view
            arrowexpandcollapseTextView = itemView.findViewById(R.id.tv_cvwithexpandability_arrowexpandcollapse);
            callerNameTextView = itemView.findViewById(R.id.tv_cvwithexpandability_title);
            callTimeTextView = itemView.findViewById(R.id.tv_cvwithexpandability_subtitle);
            llFacilityInformation = itemView.findViewById(R.id.ll_cvwithexpandability_subtitle);

            arrowexpandcollapseTextView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (llFacilityInformation.getVisibility() == View.GONE) {
                        expandLL(llFacilityInformation, arrowexpandcollapseTextView);
                    } else {
                        collapseLL(llFacilityInformation, arrowexpandcollapseTextView);
                    }
                }
            });

            callerNameTextView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (llFacilityInformation.getVisibility() == View.GONE) {
                        expandLL(llFacilityInformation, arrowexpandcollapseTextView);
                    } else {
                        collapseLL(llFacilityInformation, arrowexpandcollapseTextView);
                    }
                }
            });

            llFacilityInformation.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (llFacilityInformation.getVisibility() == View.GONE) {
                        expandLL(llFacilityInformation, arrowexpandcollapseTextView);
                    } else {
                        collapseLL(llFacilityInformation, arrowexpandcollapseTextView);
                    }
                }
            });
        }

        void showCallDetails(Phonecall call){
            // Attach values for each item
            arrowexpandcollapseTextView.setText(R.string.fa_icon_chevron_down);
            arrowexpandcollapseTextView.setTypeface(iconFont);
            llFacilityInformation.setVisibility(View.GONE);

            String callerName = call.getCallerName();
            String callTime = call.getCallTime();

            callerNameTextView.setText(callerName);
            callTimeTextView.setText(callTime);
        }
    }

    // Third ViewHolder of object type SectionHeader
    // Reference to the views for each call items to display desired information
    public class SectionViewHolder extends RecyclerView.ViewHolder {
        final Typeface iconFont = FontManager.getTypeface(context, FontManager.FONTAWESOME);

        private LinearLayout llSectionWithCards;
        private TextView arrowexpandcollapseTextView, sectionNameTextView;

        SectionViewHolder(View itemView) {
            super(itemView);
            // Initiate view
            arrowexpandcollapseTextView = itemView.findViewById(R.id.tv_sectionheaderforrv_expandcollapsearrow);
            sectionNameTextView = itemView.findViewById(R.id.tv_sectionheaderforrv_title);

            arrowexpandcollapseTextView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (llSectionWithCards.getVisibility() == View.GONE) {
                        expandLL(llSectionWithCards, arrowexpandcollapseTextView);
                    } else {
                        collapseLL(llSectionWithCards, arrowexpandcollapseTextView);
                    }
                }
            });
        }

        void showSectionDetails(SectionHeader section){
            // Attach values for each item
            arrowexpandcollapseTextView.setText(R.string.fa_icon_chevron_down);
            arrowexpandcollapseTextView.setTypeface(iconFont);

            String sectionName = section.getSectionName();

            sectionNameTextView.setText(sectionName);
        }
    }


    // Fifth ViewHolder of object type RVLineSeparator
    // Reference to the views for each call items to display desired information
    public class SeparatorViewHolder extends RecyclerView.ViewHolder {
        private View lSeparator;

        SeparatorViewHolder(View itemView) {
            super(itemView);
            lSeparator = itemView.findViewById(R.id.rv_lineseparator);
        }

        void showSeparatorDetails(){
            TypedValue tValueD = new TypedValue();
            context.getTheme().resolveAttribute(R.attr.dividerColor, tValueD, true);

            lSeparator.setBackgroundResource(tValueD.resourceId);
        }
    }

    private void expandGroup(final TextView arrowexpandcollapseTextView) {
        ?
    }

    private void collapseGroup(final TextView arrowexpandcollapseTextView) {
        ?
    }

    private void expandLL(final LinearLayout llFacilityInformation, final TextView arrowexpandcollapseTextView) {
        llFacilityInformation.setVisibility(View.VISIBLE);
        arrowexpandcollapseTextView.setText(R.string.fa_icon_chevron_up);
    }

    private void collapseLL(final LinearLayout llFacilityInformation, final TextView arrowexpandcollapseTextView) {
        llFacilityInformation.setVisibility(View.GONE);
        arrowexpandcollapseTextView.setText(R.string.fa_icon_chevron_down);
    }
}

部分标题布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/ll_sectionwithexpandability_main"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/ll_sectionheader"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="10dp"
        android:weightSum="100">

        <TextView
            android:id="@+id/tv_sectionheader_expandcollapsearrow"
            android:clickable="true"
            android:focusable="true"
            android:layout_weight="10"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="10dp"
            android:textColor="?android:attr/textColorPrimary"
            style="@android:style/TextAppearance.Large" />

        <TextView
            android:id="@+id/tv_sectionheader_title"
            android:layout_weight="90"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            style="@android:style/TextAppearance.Large" />
    </LinearLayout>

    <!-- I WANT ALL THE CARD VIEWS TO BE ADDED INSIDE THIS LINEARLAYOUT (ll_section_cards) -->
    <LinearLayout
        android:id="@+id/ll_section_cards"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

RecyclerView 布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout_recyclerView"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/my_recyclerview"
        android:clipToPadding="false"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="vertical">
    </android.support.v7.widget.RecyclerView>
</LinearLayout>

短信类

public class SMSmessage {
    private String senderName, smsContent;

    public SMSmessage(String senderName, String smsContent) {
        this.senderName = senderName;
        this.smsContent = smsContent;
    }

    public String getSenderName() {
        return senderName;
    }

    public String getSmsContent() {
        return smsContent;
    }
}

Answer 1

• 首先使用一个父布局，它是线性布局，然后创建包含任何布局（如线性或相对）的子布局，然后您可以创建第二个子布局，在子布局中您将使用卡片视图和其他组件，如 textview或在卡片视图中编辑文本

否则约束布局最好开发这个布局

例如

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ll_sectionwithexpandability_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="2"
android:orientation="vertical">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_weight="1"
    android:layout_height="wrap_content">
<android.support.v7.widget.CardView
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/ll_sectionheader"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="10dp"
    android:weightSum="100">

    <TextView
        android:id="@+id/tv_sectionheader_expandcollapsearrow"
        android:clickable="true"
        android:focusable="true"
        android:layout_weight="10"
        android:text="Testing"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="10dp"
        android:textColor="?android:attr/textColorPrimary"
        style="@android:style/TextAppearance.Large" />

    <TextView
        android:id="@+id/tv_sectionheader_title"
        android:layout_weight="90"
        android:layout_width="0dp"
        android:text="testing"
        android:layout_height="wrap_content"
        style="@android:style/TextAppearance.Large" />
   </LinearLayout>
   </android.support.v7.widget.CardView>
  </LinearLayout>
  <!-- I WANT ALL THE CARD VIEWS TO BE ADDED INSIDE THIS LINEARLAYOUT (ll_section_cards) -->
  <LinearLayout
   android:layout_width="match_parent"
    android:layout_weight="1"
   android:layout_height="wrap_content">
   <android.support.v7.widget.CardView
       android:layout_width="match_parent"
       android:layout_height="match_parent">
   <LinearLayout
    android:id="@+id/ll_section_cards"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
  <TextView
           android:id="@+id/te"
           android:layout_weight="90"
           android:layout_width="wrap_content"
           android:text="testing"
           android:layout_height="wrap_content"
           style="@android:style/TextAppearance.Large" />
  </LinearLayout>
   </android.support.v7.widget.CardView>
  </LinearLayout>
</LinearLayout>

Answer 2

编辑：您的问题属于 XY 问题：enter link description here

您的整个架构/模式似乎不合适。

您也许可以调整您的代码，因此在“OnBind”方法中，您检查下一个 n+1 对象是否是 SMSMessage 并将该批次添加到线性布局......并且以某种方式记录它们已经被“绑定”以避免双重绑定...但是您还需要检测该查看器何时未绑定...这一切似乎都在与框架希望您做事的方式作斗争。

我建议让 API（或“本地服务”）将 API 数据（最好使用像 JacksonMapper 这样的 ObjectMapper）转换为一个看起来更像的类：

import java.util.List;

public class SMSMessageCollection {

    private List<SMSMessage> smsMessages;
    private String headerText;
    private boolean hasStartingRVLine;
    private boolean hasEndingRVLine;

    public SMSMessageCollection(String headerText, boolean hasStartingRVLine, boolean hasEndingRVLine) {
        this.headerText = headerText;
        this.hasStartingRVLine = hasStartingRVLine;
        this.hasEndingRVLine = hasEndingRVLine;
    }

    //CUSTOM "ADDER":
    public void addSMSMessagesToCollection(List<SMSMessage> smsMessagesToAdd){
        this.smsMessages.addAll(smsMessagesToAdd);
    }

    //GETTER AND SETTER HERE -> OR USE LOMBOK...

}

这个类包含一个List<SMSMessages>，所以当对象被绑定到回收器适配器时，你可以遍历列表并将它们添加到线性布局中。

这就是我的 Activity 的样子...获取 API 数据并制作一个 SMSMessageCollection(s) 列表，然后可以通过一个 ViewHolder 将其传递给适配器...

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;

import org.json.JSONArray;

import java.io.IOException;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //This would be fetched using say Volley...and the structure should MATCH the class we have made...
        //Otherwise...make a "service class" to convert the API response to the SMSMessageCollection
        JSONArray apiDataModels = new JSONArray();

        // Jackson ObjectMapper will turn the API data in to a List or POJOs...in like two lines.
        try {
            List<SMSMessageCollection> smsMessageCollections = new ObjectMapper()
                    .readValue(apiDataModels.toString(),new TypeReference<List<SMSMessageCollection>>(){});
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

因此，在 adpater 的 OnBindViewHolder 方法中，您可以获取该部分的 List 并以编程方式将它们添加到被注入的 ViewHolder 的 LienarLayout。