从布局创建具有多个视图的 RecyclerView

Question

我试图在一个 RecyclerView 中有 2 个布局

我有一个名为 Bookmark 的回收器视图列表，它是从 xml 中解析出来的，这一切正常，但我想在这个 recyclerview 中放置另一个包含按钮并且可以点击的布局。像照片一样，图标来自recyclerview，加号按钮需要与列表兼容，如果列表更大或更小，按钮将与列表空间兼容。

这是我的适配器的新代码，它取决于答案@LluisFelisart 这是错误 ViewHolder views must not be attached when created. Ensure that you are not passing 'true' to the attachToRoot parameter of LayoutInflater.inflate(..., boolean attachToRoot)

    public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    private Context context;
    ArrayList<Bookmark> arrayList = new ArrayList<>();

    public MyAdapter(Context context, ArrayList<Bookmark> arrayList) {
        this.context = context;
        this.arrayList = arrayList;
    }

    public class ViewHolder0 extends RecyclerView.ViewHolder {

        TextView tvName,tvId,tvSearchUrl,tvNativeUrl;
        ImageView tvIcon;

        public ViewHolder0(@NonNull  View itemView) {
            super(itemView);

            tvName=itemView.findViewById(R.id.textView);
            tvIcon = itemView.findViewById(R.id.image_view);
         /*   tvId=itemView.findViewById(R.id.tvId);
            tvSearchUrl=itemView.findViewById(R.id.tvSearchUrl);
            tvNativeUrl=itemView.findViewById(R.id.tvNativeUrl);*/
        }
    }

    public class ViewHolder2 extends RecyclerView.ViewHolder {
        ImageView tvAddBookmark;

        public ViewHolder2(@NonNull View itemView) {
            super(itemView);
            tvAddBookmark = itemView.findViewById(R.id.image_button_add);
        }
    }
    @Override
    public int getItemViewType(int position) {
        // Just as an example, return 0 or 2 depending on position
        // Note that unlike in ListView adapters, types don't have to be contiguous
        return position % 2 * 2;
    }




    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.grid_item, viewGroup, false);

        switch (i) {
            case 0: return new ViewHolder0(viewGroup);
            case 2: return new ViewHolder2(viewGroup);
        }

        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        switch (holder.getItemViewType()) {
            case 0:
                ViewHolder0 viewHolder0 = (ViewHolder0) holder;
                ((ViewHolder0) holder).tvName.setText(arrayList.get(position).getName());
                ((ViewHolder0) holder).tvIcon.setImageResource(arrayList.get(position).getIcon());
                break;

            case 2:
                ViewHolder2 viewHolder2 = (ViewHolder2) holder;

        }
        ((ViewHolder0) holder).tvIcon.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent;
                intent = new Intent(context, BookmarkActivity.class);
                v.getContext().startActivity(intent);
            }
        });

        ((ViewHolder0) holder).tvIcon.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View v) {
                Intent intent = new Intent(context, ActivityBookmarksFavorites.class);
                v.getContext().startActivity(intent);
                return false;
            }
        });
    }




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

    public class ViewHolder extends RecyclerView.ViewHolder  {

        TextView tvName,tvId,tvSearchUrl,tvNativeUrl;
        ImageView tvIcon;

        public ViewHolder(@NonNull  View itemView) {
            super(itemView);

            tvName=itemView.findViewById(R.id.textView);
            tvIcon = itemView.findViewById(R.id.image_view);
         /*   tvId=itemView.findViewById(R.id.tvId);
            tvSearchUrl=itemView.findViewById(R.id.tvSearchUrl);
            tvNativeUrl=itemView.findViewById(R.id.tvNativeUrl);*/
        }



    }



}

这是网格项目布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical"
    android:visibility="visible"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <ImageView
        android:id="@+id/image_view"
        style="@style/BookmarkIconIv" />
    <TextView android:id="@+id/textView"
        android:layout_marginTop="1.0dip"
        style="@style/BookmarkTextTv" />
</LinearLayout>

这是我想在回收站视图中的按钮布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageButton
        android:id="@+id/image_button_add"
        android:layout_width="45dp"
        android:layout_height="45dp"
        android:src="@drawable/ic_add_black_24dp"
        android:background="@color/transparent" />

</android.support.constraint.ConstraintLayout>

这是它显示的回收器视图的片段

public class FragmentBookmark extends Fragment {
    ArrayList<Bookmark> arrayList = new ArrayList<>();
    XmlPullParser pullParser;
    MyAdapter myAdapter;
    View paramView;
    RecyclerView myRecyclerView;
    private Context mContext;
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        mContext = context;
    }
    @Nullable
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
       paramView = inflater.inflate(R.layout.bookmark, container, false);

        myRecyclerView =  paramView.findViewById(R.id.myRecyclerView);
        myRecyclerView.setLayoutManager(new GridLayoutManager(mContext, 4));
        myRecyclerView.setHasFixedSize(true);
        myAdapter = new MyAdapter(mContext, arrayList);
        myRecyclerView.setAdapter(myAdapter);
        try {
            XmlPullParser xpp = getResources().getXml(R.xml.bookmarks);
            while (xpp.getEventType() != XmlPullParser.END_DOCUMENT) {
                if (xpp.getEventType() == XmlPullParser.START_TAG) {
                    if (xpp.getName().equals("Bookmark")) {
                        Bookmark bookmark = new Bookmark();
                        bookmark.setName(xpp.getAttributeValue(null, "name"));
                        int drawableResourceId = getResources().getIdentifier(xpp.getAttributeValue(null, "icon"),"drawable", mContext.getPackageName());
                        bookmark.setIcon(drawableResourceId);
                        arrayList.add(bookmark);
                    }
                }
                xpp.next();
            }
        } catch (XmlPullParserException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        myAdapter.notifyDataSetChanged();
        return paramView;
    }
    }

这是包含 recyclerview 的布局书签

<LinearLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/myRecyclerView"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_marginBottom="8dp"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    android:fillViewport="false">

    </android.support.v7.widget.RecyclerView>

</LinearLayout>

Answer 1

这是答案

按照以下步骤操作

首先为您的多视图类型创建两个布局

示例代码

layout.layout_one

<?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"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    app:cardCornerRadius="15dp"
    app:cardElevation="5dp"
    app:cardUseCompatPadding="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="Name  : " />

            <TextView
                android:id="@+id/tvName"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="Icon  : " />

            <ImageView
                android:id="@+id/tvIcon"
                android:layout_width="20dp"
                android:layout_height="20dp"
                android:padding="10dp"
                android:text="" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="Id  : " />

            <TextView
                android:id="@+id/tvId"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="SearchUrl  : " />

            <TextView
                android:id="@+id/tvSearchUrl"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="NativeUrl  : " />

            <TextView
                android:id="@+id/tvNativeUrl"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="10dp"
                android:text="" />

        </LinearLayout>

    </LinearLayout>

</android.support.v7.widget.CardView>

layout.button_two

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

    <ImageView
        android:id="@+id/imgButton"
        android:layout_width="50dp"
        android:layout_height="50dp" />
</LinearLayout>

现在你需要RecyclerView.ViewHolder为你的两个 viewType创建两个

现在你需要覆盖 getItemViewType()

• viewType出于查看回收的目的，它返回位置处的项目的 。

现在在您的onCreateViewHolder()方法中，您需要ViewHolder根据viewType您将使用的getItemViewType()方法返回您的实例

比onBindViewHolder()基于您的方法viewType设置您的视图属性

这是RecyclerView.Adapter具有多种视图类型的示例代码

数据适配器

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;

public class DataAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private Context context;
    ArrayList<Bookmark> arrayList = new ArrayList<>();
    public static final int ITEM_TYPE_ONE = 0;
    public static final int ITEM_TYPE_TWO = 1;

    public DataAdapter(Context context, ArrayList<Bookmark> arrayList) {
        this.context = context;
        this.arrayList = arrayList;
    }

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

        View view = null;
        // check here the viewType and return RecyclerView.ViewHolder based on view type
        if (viewType == ITEM_TYPE_ONE) {
            view = LayoutInflater.from(context).inflate(R.layout.layout_one, parent, false);
            return new ViewHolder(view);
        } else if (viewType == ITEM_TYPE_TWO) {
            view = LayoutInflater.from(context).inflate(R.layout.button_two, parent, false);
            return new ButtonViewHolder(view);
        }else {
            return  null;
        }

    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {

        final int itemType = getItemViewType(position);
        // First check here the View Type
        // than set data based on View Type to your recyclerview item
        if (itemType == ITEM_TYPE_ONE) {
            ViewHolder viewHolder = (ViewHolder) holder;
            viewHolder.tvName.setText(arrayList.get(position).getName());
            viewHolder.tvIcon.setImageResource(arrayList.get(position).getIcon());
            viewHolder.tvSearchUrl.setText(arrayList.get(position).getSearchUrl());
            viewHolder.tvNativeUrl.setText(arrayList.get(position).getNativeUrl());
        } else if (itemType == ITEM_TYPE_TWO) {
            ButtonViewHolder buttonViewHolder = (ButtonViewHolder) holder;
            buttonViewHolder.imgButton.setImageResource(arrayList.get(position).getIcon());
        }

    }

    @Override
    public int getItemViewType(int position) {
        // based on you list you will return the ViewType 
        if (arrayList.get(position).getViewType() == 0) {
            return ITEM_TYPE_ONE;
        } else {
            return ITEM_TYPE_TWO;
        }
    }

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

    public class ViewHolder extends RecyclerView.ViewHolder {

        TextView tvName, tvId, tvSearchUrl, tvNativeUrl;

        ImageView tvIcon;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);

            tvName = itemView.findViewById(R.id.tvName);
            tvIcon = itemView.findViewById(R.id.tvIcon);
            tvId = itemView.findViewById(R.id.tvId);
            tvSearchUrl = itemView.findViewById(R.id.tvSearchUrl);
            tvNativeUrl = itemView.findViewById(R.id.tvNativeUrl);
        }
    }

    public class ButtonViewHolder extends RecyclerView.ViewHolder {


        ImageView imgButton;

        public ButtonViewHolder(@NonNull View itemView) {
            super(itemView);

            imgButton = itemView.findViewById(R.id.imgButton);

        }
    }
}

在列表中添加数据时，您需要提供viewtypein 列表

在BookmarkPOJO 类中进行一些更改

Bookmark POJO类

public class Bookmark
{
    String name,id,nativeUrl,searchUrl;
    int icon;

    int viewType;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public int getIcon() {
        return icon;
    }

    public void setIcon(int icon) {
        this.icon = icon;
    }

    public String getNativeUrl() {
        return nativeUrl;
    }

    public void setNativeUrl(String nativeUrl) {
        this.nativeUrl = nativeUrl;
    }

    public String getSearchUrl() {
        return searchUrl;
    }

    public void setSearchUrl(String searchUrl) {
        this.searchUrl = searchUrl;
    }

    public int getViewType() {
        return viewType;
    }

    public void setViewType(int viewType) {
        this.viewType = viewType;
    }

    @Override
    public String toString() {
        return "Bookmark{" +
                "name='" + name + '\'' +
                ", icon='" + icon + '\'' +
                ", id='" + id + '\'' +
                ", nativeUrl='" + nativeUrl + '\'' +
                ", searchUrl='" + searchUrl + '\'' +
                '}';
    }
}

示例活动代码

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import java.io.IOException;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private Context mContext;
    ArrayList<Bookmark> arrayList = new ArrayList<>();

    RecyclerView myRecyclerView;
    DataAdapter dataAdapter;

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


        mContext = this;

        myRecyclerView = findViewById(R.id.myRecyclerView);
        myRecyclerView.setLayoutManager(new LinearLayoutManager(mContext));
        myRecyclerView.setHasFixedSize(true);

        dataAdapter = new DataAdapter(mContext, arrayList);
        myRecyclerView.setAdapter(dataAdapter);

        try {

            XmlPullParser xpp = getResources().getXml(R.xml.bookmarks);

            while (xpp.getEventType() != XmlPullParser.END_DOCUMENT) {
                if (xpp.getEventType() == XmlPullParser.START_TAG) {
                    if (xpp.getName().equals("Bookmark")) {

                        Log.e("MY_VALUE", " * " + xpp.getAttributeValue(0) + " * ");
                        Log.e("MY_VALUE", " * " + xpp.getAttributeValue(1) + " * ");
                        Log.e("MY_VALUE", " * " + xpp.getAttributeValue(5) + " * ");
                        Log.e("MY_VALUE", " * " + xpp.getAttributeValue(2) + " * ");
                        Log.e("MY_VALUE", " * " + xpp.getAttributeValue(3) + " * ");
                        Log.e("MY_VALUE", " * " + xpp.getAttributeValue(4) + " * ");


                        Bookmark bookmark = new Bookmark();
                        bookmark.setName(xpp.getAttributeValue(0));

                        int drawableResourceId = this.getResources().getIdentifier(xpp.getAttributeValue(1), "drawable", mContext.getPackageName());
                        bookmark.setIcon(drawableResourceId);

                        bookmark.setId(xpp.getAttributeValue(2));

                        bookmark.setSearchUrl(xpp.getAttributeValue(3));
                        bookmark.setNativeUrl(xpp.getAttributeValue(4));

                        // here you need to set view type
                        bookmark.setViewType(0);
                        arrayList.add(bookmark);
                    }
                }

                xpp.next();
            }
        } catch (XmlPullParserException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // here i have added second viewType
        // you need to set as per your requirement
        Bookmark bookmark = new Bookmark();
        bookmark.setViewType(1);
        bookmark.setIcon(R.drawable.dishu);
        arrayList.add(bookmark);
        dataAdapter.notifyDataSetChanged();

    }


}

笔记

在下面的代码中，我viewType 在Arraylist 您需要viewType 根据您的要求设置的最后一个索引处设置了第二个

有关更多信息，您可以查看以下文章

• 使用 RecyclerView 和多种视图类型
• 具有多种项目类型的 RecyclerView
• 具有不同子布局的 Android RecyclerView
• Android 分页教程——处理多种视图类型
• RecyclerView 中的异构布局
• Android RecyclerView 示例 – 多个 ViewType
• 如何创建具有多种视图类型的 RecyclerView？
• 使用 RecyclerView 的 Android 多行布局