Android RecyclerView列表示例

RecyclerView類擴展了ViewGroup類并實現了ScrollingView接口。愛掏網 - it200.com它在Marshmallow中引入。愛掏網 - it200.com它是ListView的高級版本，具有更好的性能和其他優點。愛掏網 - it200.comRecyclerView主要用于設計Android應用程序的列表和網格，具有細粒度的控制。愛掏網 - it200.com

在本教程中，我們將使用RecyclerView創建一個項目列表，其中包含ImageView（用于圖標）和TextView（用于描述），并對其列表項執行點擊監聽器。愛掏網 - it200.com

創建一個Android項目，并在build.gradle文件中添加RecyclerView支持庫 com.android.support:recyclerview-v7:23.1.0 或以上版本。愛掏網 - it200.com

在布局目錄的activity_main.xml文件中，添加RecyclerView小部件。愛掏網 - it200.com

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="vertical"
        android:id="@+id/recyclerView"
        tools:context="example.javatpoint.com.recyclerviewlist.MainActivity">

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

在 values 目錄下創建一個 dimens.xml 文件，并添加以下代碼。愛掏網 - it200.com

dimens.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
    <dimen name="ic_clear_margin">56dp</dimen>
</resources>

創建一個自定義布局 list_item.xml 文件，其代碼如下。愛掏網 - it200.com

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/relativeLayout"
    android:layout_width="match_parent"
    android:layout_height="?android:attr/listPreferredItemHeightLarge"
    android:background="@drawable/border">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentLeft="true"
        android:layout_marginStart="@dimen/activity_horizontal_margin"
        android:layout_marginEnd="@dimen/activity_horizontal_margin"
        android:contentDescription="Icon" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_toEndOf="@id/imageView"
        android:layout_toRightOf="@id/imageView"
        android:gravity="center_vertical"
        android:textSize="16sp"/>

</RelativeLayout>

在drawable目錄中創建一個 border.xml 文件，該文件用于裝飾RecyclerView項的邊框。愛掏網 - it200.com

border.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#FFFFFF" />
    <stroke
        android:width="1dp"
        android:color="#CCCCCC" />
</shape>

創建一個名為 MyListData.java 的類，并使用以下代碼。愛掏網 - it200.com該類被用作（POJO）類，用于設置項目的屬性。愛掏網 - it200.com

MyListData.java

package example.javatpoint.com.recyclerviewlist;
public class MyListData{
    private String description;
    private int imgId;
    public MyListData(String description, int imgId) {
        this.description = description;
        this.imgId = imgId;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
    public int getImgId() {
        return imgId;
    }
    public void setImgId(int imgId) {
        this.imgId = imgId;
    }
}

創建一個 MyListAdapter.java 類，并添加以下代碼。愛掏網 - it200.com此類擴展RecyclerView.Adapter類并覆蓋其未實現的方法。愛掏網 - it200.com在onCreateViewHolder()方法中，使用list_item.xml進行布局。愛掏網 - it200.com在onBindViewHolder()方法中，將每個數據項設置到每行中。愛掏網 - it200.com

MyListAdapter.java

package example.javatpoint.com.recyclerviewlist;

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.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;


public class MyListAdapter extends RecyclerView.Adapter{
    private MyListData[] listdata;

   // RecyclerView recyclerView;
    public MyListAdapter(MyListData[] listdata) {
        this.listdata = listdata;
    }
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
        View listItem= layoutInflater.inflate(R.layout.list_item, parent, false);
        ViewHolder viewHolder = new ViewHolder(listItem);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        final MyListData myListData = listdata[position];
        holder.textView.setText(listdata[position].getDescription());
        holder.imageView.setImageResource(listdata[position].getImgId());
        holder.relativeLayout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(view.getContext(),"click on item: "+myListData.getDescription(),Toast.LENGTH_LONG).show();
            }
        });
    }


    @Override
    public int getItemCount() {
        return listdata.length;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        public ImageView imageView;
        public TextView textView;
        public RelativeLayout relativeLayout;
        public ViewHolder(View itemView) {
            super(itemView);
            this.imageView = (ImageView) itemView.findViewById(R.id.imageView);
            this.textView = (TextView) itemView.findViewById(R.id.textView);
            relativeLayout = (RelativeLayout)itemView.findViewById(R.id.relativeLayout);
        }
    }
}

最后，在 MainActivity.java 類中添加以下代碼。愛掏網 - it200.com該類創建了適用于MyListData類的項目數組，并將適配器類設置為RecyclerView。愛掏網 - it200.com

MainActivity.java

package example.javatpoint.com.recyclerviewlist;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        MyListData[] myListData = new MyListData[] {
                new MyListData("Email", android.R.drawable.ic_dialog_email),
                new MyListData("Info", android.R.drawable.ic_dialog_info),
                new MyListData("Delete", android.R.drawable.ic_delete),
                new MyListData("Dialer", android.R.drawable.ic_dialog_dialer),
                new MyListData("Alert", android.R.drawable.ic_dialog_alert),
                new MyListData("Map", android.R.drawable.ic_dialog_map),
                new MyListData("Email", android.R.drawable.ic_dialog_email),
                new MyListData("Info", android.R.drawable.ic_dialog_info),
                new MyListData("Delete", android.R.drawable.ic_delete),
                new MyListData("Dialer", android.R.drawable.ic_dialog_dialer),
                new MyListData("Alert", android.R.drawable.ic_dialog_alert),
                new MyListData("Map", android.R.drawable.ic_dialog_map),
        };

        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        MyListAdapter adapter = new MyListAdapter(myListData);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(adapter);
    }
}

輸出: