封装RecyclerView适配器Adapter（比原版实现要省75%的代码）

梦里梦外; 2023-06-12 11:24 3阅读 0赞

首先，要导入两个依赖（很重要！！！！）  
没有导入RecyclerView依赖的请参考：[https://blog.csdn.net/weixin\_42230348/article/details/103020497][https_blog.csdn.net_weixin_42230348_article_details_103020497]  
1、项目中的build.gradle添加依赖  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA_size_16_color_FFFFFF_t_70]  
将以下代码粘贴到图示位置，保存就ok了

maven {  url "https://jitpack.io" }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA_size_16_color_FFFFFF_t_70 1]  
2、App中的build gradle添加依赖，将以下代码粘贴到图示位置，保存就ok了~~~

implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.47'

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA_size_16_color_FFFFFF_t_70 2]  
OK，依赖导入成功，现在开始敲代码~~~~  
1、先定义一个实体Entity类

package com.wmc.loginapplication;
    
    import android.os.Parcel;
    import android.os.Parcelable;
    //Parcelable接口是为了实现数据序列化，利于传输
    public class Entity implements Parcelable
    { 
    
        private int count;
    
        private String msg;
    
        public Entity(int count)
        { 
            this.count = count;
        }
    
        public Entity(int count, String msg)
        { 
            this.count = count;
            this.msg = msg;
        }
    
        public Entity(String msg)
        { 
            this.msg = msg;
        }
    
        public int getCount()
        { 
            return count;
        }
    
        public void setCount(int count)
        { 
            this.count = count;
        }
    
        public String getMsg()
        { 
            return msg;
        }
    
        public void setMsg(String msg)
        { 
            this.msg = msg;
        }
    
        @Override
        public int describeContents() {  return 0; }
    
        @Override
        public void writeToParcel(Parcel dest, int flags)
        { 
            dest.writeInt(this.count);
            dest.writeString(this.msg);
        }
    
        protected Entity(Parcel in)
        { 
            this.count = in.readInt();
            this.msg = in.readString();
        }
    
        public static final Parcelable.Creator<Entity> CREATOR = new Parcelable.Creator<Entity>()
        { 
            @Override
            public Entity createFromParcel(Parcel source) { return new Entity(source);}
    
            @Override
            public Entity[] newArray(int size) { return new Entity[size];}
        };
    }

2、在主活动Activity中定义布局管理器、设置适配器，为实体赋值

package com.wmc.loginapplication;
    
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.recyclerview.widget.LinearLayoutManager;
    import androidx.recyclerview.widget.RecyclerView;
    
    import android.os.Bundle;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class SimpleRecyclerViewDemoActivity extends AppCompatActivity { 
        private RecyclerView recyclerView ;
    
        private SimpleRecyclerAdapter adapter ;
    
        private List<Entity> data;
        @Override
        protected void onCreate(Bundle savedInstanceState) { 
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_recycler_view_demo);
            recyclerView = findViewById(R.id.recycler_view) ;
            //设置布局管理器
            recyclerView.setLayoutManager(new LinearLayoutManager(this));
            //设置适配器
            adapter = new SimpleRecyclerAdapter(R.layout.item_list_demo,null) ;
            recyclerView.setAdapter(adapter);
            initData();
        }
        //为实体设置数据
        private void initData() { 
            data = new ArrayList<>();
            for (int i = 0; i < 100; i++) { 
                Entity entity = new Entity("index" + i);
                data.add(entity);
            }
    
            adapter.setNewData(data);
        }
    }

3、主活动布局（列表）

4、自定义适配器Adapter

package com.wmc.loginapplication;
    
    import androidx.annotation.NonNull;
    import androidx.annotation.Nullable;
    
    import com.chad.library.adapter.base.BaseQuickAdapter;
    import com.chad.library.adapter.base.BaseViewHolder;
    
    import java.util.List;
    
    public class SimpleRecyclerAdapter extends BaseQuickAdapter<Entity, BaseViewHolder> { 
    
        public SimpleRecyclerAdapter (int layoutResId,@Nullable List<Entity> data){ 
            super(layoutResId,data);//调用父类的有参构造
        }
        @Override
        protected void convert(@NonNull BaseViewHolder holder, Entity item) { 
            //主要功能是设置要显示数据
              holder.setText(R.id.tv_text,item.getMsg()) ;
        }
    }

5、数据展示布局

<?xml version="1.0" encoding="utf-8"?>
    <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
    
        <TextView
            android:id="@+id/tv_text"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:gravity="center_horizontal"
            android:padding="30dp"
            android:textSize="18sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:text="TextView"
            tools:textColor="@color/colorPrimary"
            tools:textSize="30sp" />
    
        <View
            android:id="@+id/textView7"
            android:layout_width="0dp"
            android:layout_height="2dp"
            android:layout_marginBottom="4dp"
            android:background="#4E0B0B"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/tv_text" />
    
    
    </androidx.constraintlayout.widget.ConstraintLayout>

最后，运行程序，跑起来看看~~~~~~  
大功告成！！！！  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA_size_16_color_FFFFFF_t_70 3]

[https_blog.csdn.net_weixin_42230348_article_details_103020497]: https://blog.csdn.net/weixin_42230348/article/details/103020497
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191112204134398.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191112204325730.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20191112205257720.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA==,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20191112210807901.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjIzMDM0OA==,size_16,color_FFFFFF,t_70