Android 如何在“中迁移我的代码”；onCreateViewHolder“；至；onBindViewHolder"；

这是我在onCreateViewHolder中的代码

有人告诉我，在那里写不是一个好习惯，它应该在onBindViewHolder中

尽管我在网上看了一些例子，但我似乎不知道如何正确地完成它

---

那么，我应该如何处理这个问题呢？

onCreateViewHolder（）应该包含创建ViewHolder的代码，并且

onBindViewHolder（）应该用数据填充它。当集合包含许多元素并由用户滚动时，任何其他方法都会导致问题

就我所见，在您的例子中，无论
CAT\u IMAGE\u id.get（I）.getButton（）
和
CAT\u IMAGE\u id.get（I）.getDummy（）的值是多少，创建的布局都是一样的。这意味着
onBindViewHolder（）
的主体应该如下所示：

ViewGroup viewGroup = (ViewGroup) LayoutInflater.from(parent.getContext()).inflate(R.layout.widget_holder, parent, false);
LinearLayout ln = new LinearLayout(parent.getContext());
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(230, 250, Gravity.CENTER);
ln.setLayoutParams(params);
viewGroup.addView(ln);
return new ItemViewHolder(viewGroup);

请注意，我只留下了实际创建布局的代码，而没有留下设置可见性的部分-应该在
onBindViewHolder（）中完成


通常，onBindViewHolder（）的
onBindViewHolder（）
不仅仅用于更改元素的可见性，例如，用文本和图片填充视图

您可以获取更多信息。
这里缺少的逻辑只是利用这种方法并相应地回收您的视图。请看以下示例代码：

package yourpackage.goeshere;

import android.content.Context;
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 java.util.ArrayList;
import java.util.List;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import yourpackage.goeshere.R;

public class SampleRecyclerViewAdapter2  extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    //region Vars
    private List<Object> mListObjects;
    private LayoutInflater mInflater;
    private Context context;
    //endregion 

    //region Constructor
    public SampleRecyclerViewAdapter2(@NonNull Context context){
        this.context = context;
        this.mInflater = LayoutInflater.from(this.context);
    }

    //endregion

    //region Initialization
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = mInflater.inflate(R.layout.your_layout_file_here, parent, false);
        SampleRecyclerViewAdapter2.AdapterHolderType viewHolder2 = new SampleRecyclerViewAdapter2.AdapterHolderType(view);
        return viewHolder2;
    }
    //endregion

    //region Override Methods
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder0, final int position) {

        final Object nonCastObject = mListObjects.get(position);
        if(nonCastObject == null){
            //Decide what to do here
            return;
        }

        //Cast the Holder Here
        SampleRecyclerViewAdapter2.AdapterHolderType holder = (SampleRecyclerViewAdapter2.AdapterHolderType) holder0;

        //Cast the Object Here to your pojo
//      MyCustomObject obj = (MyCustomObject) nonCastObject;

        //Set Fields here; adjust dynamically from cast object
        holder.adapter_sample_recyclerview_iv.setImageResource(R.mipmap.ic_launcher);
        holder.adapter_sample_recyclerview_tv.setText("Some text");

        //Set listeners here
        holder.rootview.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Can set a click listener here if need be
            }
        });

        //Handle animations here if you want them
    }

    @Override
    public int getItemCount() {
        return ((this.mListObjects == null) ? 0 : this.mListObjects.size());
    }

    //endregion

    //region Class Methods

    /**
     * Add one object to the list
     * @param position Position to add into
     * @param mObject Single object to update. If null, will be ignored (Call remove instead).
     *                {@link Object}
     */
    public void addOneObject(int position, Object mObject){
        if(mObject == null){
            return;
        }
        if(position < 0 || position > getItemCount()){
            //Out of bounds
            return;
        }
        if(this.mListObjects == null){
            this.mListObjects = new ArrayList<>();
        }
        this.mListObjects.add(position, mObject);
        this.notifyItemChanged(position);
    }

    /**
     * Update one object in the list
     * @param position Position to update
     * @param mObject Single object to update. If null, will be ignored (Call remove instead).
     *                {@link Object}
     */
    public void updateOneObject(int position, Object mObject){
        if(mObject == null){
            return;
        }
        if(position < 0 || position >= getItemCount()){
            //Out of bounds
            return;
        }
        this.mListObjects.set(position, mObject);
        this.notifyItemChanged(position);
    }

    /**
     * Remove a single object from the list
     * @param position Position to remove
     */
    public void removeOneObject(int position){
        if(this.mListObjects != null){
            if(position < 0 || position >= getItemCount()){
                this.mListObjects.remove(position);
                this.notifyItemChanged(position);
            }
        }
    }

    /**
     * Set data list
     * @param mListObjects {@link Object}
     */
    public void setListObjects(List<Object> mListObjects){
        this.mListObjects = mListObjects;
        this.notifyDataSetChanged();
    }
    //endregion

    //region Class Holders

    class AdapterHolderType extends RecyclerView.ViewHolder {

        ImageView adapter_sample_recyclerview_iv;
        RelativeLayout rootview;
        TextView adapter_sample_recyclerview_tv;

        public AdapterHolderType(View itemView) {
            super(itemView);
            this.adapter_sample_recyclerview_tv = itemView.findViewById(R.id.adapter_sample_recyclerview_tv);
            this.rootview = itemView.findViewById(R.id.rootview);
            this.adapter_sample_recyclerview_iv = itemView.findViewById(R.id.adapter_sample_recyclerview_iv);
        }
    }

    //endregion
}

package yourpackage.goesher；
导入android.content.Context；
导入android.view.LayoutInflater；
导入android.view.view；
导入android.view.ViewGroup；
导入android.widget.ImageView；
导入android.widget.RelativeLayout；
导入android.widget.TextView；
导入java.util.ArrayList；
导入java.util.List；
导入androidx.annotation.NonNull；
导入androidx.recyclerview.widget.recyclerview；
导入您的包；
公共类SampleRecyclerViewAdapter2扩展了RecyclerView.Adapter{
//区域变量
私有列表mListObjects；
私人停车场；
私人语境；
//端区
//区域构造函数
公共采样器ECyclServiceAdapter2（@NonNull上下文）{
this.context=上下文；
this.mInflater=LayoutInflater.from（this.context）；
}
//端区
//区域初始化
@凌驾
public RecyclerView.ViewHolder onCreateViewHolder（视图组父级，int-viewType）{
View View=mInflater.inflate（R.layout.your\u layout\u file\u here，parent，false）；
SampleRecyclServiceAdapter2.AdapterHolderType视图持有者2=新SampleRecyclServiceAdapter2.AdapterHolderType（视图）；
返回viewHolder2；
}
//端区
//区域覆盖方法
@凌驾
BindViewHolder上的公共无效（RecyclerView.ViewHolder holder0，最终int位置）{
最终对象nonCastObject=mListObjects.get（位置）；
if（nonCastObject==null）{
//决定在这里做什么
返回；
}
//把支架放在这里
SamplerCyclerServiceAdapter2.AdapterHolderType持有者=（SamplerCyclerServiceAdapter2.AdapterHolderType）持有者0；
//将此对象投射到您的pojo
//MyCustomObject obj=（MyCustomObject）非CastObject；
//在此处设置字段；根据强制转换对象动态调整
holder.adapter\u sample\u recyclerview\u iv.setImageResource（R.mipmap.ic\u启动器）；
holder.adapter\u sample\u recyclerview\u tv.setText（“一些文本”）；
//在此处设置侦听器
holder.rootview.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
//如果需要，可以在此处设置单击侦听器
}
});
//如果需要，请在此处处理动画
}
@凌驾
public int getItemCount（）{
返回（（this.mListObjects==null）？0:this.mListObjects.size（）；
}
//端区
//区域类方法
/**
*将一个对象添加到列表中
*@param position要添加到的位置
*@param mObject要更新的单个对象。如果为null，将被忽略（改为调用remove）。
*{@link Object}
*/
public void addOneObject（int位置，Object mObject）{
if（mObject==null）{
返回；
}
如果（位置<0 | |位置>getItemCount（））{
//出界
返回；
}
if（this.mListObjects==null）{
this.mListObjects=新的ArrayList（）；
}
this.mListObjects.add（position，mObject）；
此项变更（位置）；
}
/**
*更新列表中的一个对象
*@param-position要更新的位置
*@param mObject要更新的单个对象。如果为null，将被忽略（改为调用remove）。
*{@link Object}
*/
public void updateOneObject（int位置，Object mObject）{
if（mObject==null）{
返回；
}
如果（位置<0 | |位置>=getItemCount（））{
//出界
返回；
}
this.mListObjects.set（位置，mObject）；
此项变更（位置）；
}
/**
*从列表中删除单个对象
*@param-position要删除的位置
*/
public void removeOneObject（int位置）{
if（this.mListObjects！=null）{
如果（位置<0 | |位置>=getItemCount（））{
此.mListObjects.remove（位置）；
此项变更（位置）；
}
}
}
/**
*设置数据列表
*@param mListObjects{@link Object}
*/
public void setListObjects（列表mlistObject）{
this.mListObjects=mListObjects；
this.notifyDataSetChanged（）；
}
//端区
//地区级持有人
类AdapterHolderType扩展了RecyclerView.ViewHolder{
ImageView适配器\u样本\u回收视图\u iv；
相对论根视图；
TextView适配器\u示例\u回收
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
    if (CAT_IMAGE_IDS.get(position).getButton()){
        holder.itemView.setVisibility(View.VISIBLE);
    } else if (CAT_IMAGE_IDS.get(position).getDummy()){
        holder.itemView.setVisibility(View.INVISIBLE);
    }
}

package yourpackage.goeshere;

import android.content.Context;
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 java.util.ArrayList;
import java.util.List;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import yourpackage.goeshere.R;

public class SampleRecyclerViewAdapter2  extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    //region Vars
    private List<Object> mListObjects;
    private LayoutInflater mInflater;
    private Context context;
    //endregion 

    //region Constructor
    public SampleRecyclerViewAdapter2(@NonNull Context context){
        this.context = context;
        this.mInflater = LayoutInflater.from(this.context);
    }

    //endregion

    //region Initialization
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = mInflater.inflate(R.layout.your_layout_file_here, parent, false);
        SampleRecyclerViewAdapter2.AdapterHolderType viewHolder2 = new SampleRecyclerViewAdapter2.AdapterHolderType(view);
        return viewHolder2;
    }
    //endregion

    //region Override Methods
    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder0, final int position) {

        final Object nonCastObject = mListObjects.get(position);
        if(nonCastObject == null){
            //Decide what to do here
            return;
        }

        //Cast the Holder Here
        SampleRecyclerViewAdapter2.AdapterHolderType holder = (SampleRecyclerViewAdapter2.AdapterHolderType) holder0;

        //Cast the Object Here to your pojo
//      MyCustomObject obj = (MyCustomObject) nonCastObject;

        //Set Fields here; adjust dynamically from cast object
        holder.adapter_sample_recyclerview_iv.setImageResource(R.mipmap.ic_launcher);
        holder.adapter_sample_recyclerview_tv.setText("Some text");

        //Set listeners here
        holder.rootview.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Can set a click listener here if need be
            }
        });

        //Handle animations here if you want them
    }

    @Override
    public int getItemCount() {
        return ((this.mListObjects == null) ? 0 : this.mListObjects.size());
    }

    //endregion

    //region Class Methods

    /**
     * Add one object to the list
     * @param position Position to add into
     * @param mObject Single object to update. If null, will be ignored (Call remove instead).
     *                {@link Object}
     */
    public void addOneObject(int position, Object mObject){
        if(mObject == null){
            return;
        }
        if(position < 0 || position > getItemCount()){
            //Out of bounds
            return;
        }
        if(this.mListObjects == null){
            this.mListObjects = new ArrayList<>();
        }
        this.mListObjects.add(position, mObject);
        this.notifyItemChanged(position);
    }

    /**
     * Update one object in the list
     * @param position Position to update
     * @param mObject Single object to update. If null, will be ignored (Call remove instead).
     *                {@link Object}
     */
    public void updateOneObject(int position, Object mObject){
        if(mObject == null){
            return;
        }
        if(position < 0 || position >= getItemCount()){
            //Out of bounds
            return;
        }
        this.mListObjects.set(position, mObject);
        this.notifyItemChanged(position);
    }

    /**
     * Remove a single object from the list
     * @param position Position to remove
     */
    public void removeOneObject(int position){
        if(this.mListObjects != null){
            if(position < 0 || position >= getItemCount()){
                this.mListObjects.remove(position);
                this.notifyItemChanged(position);
            }
        }
    }

    /**
     * Set data list
     * @param mListObjects {@link Object}
     */
    public void setListObjects(List<Object> mListObjects){
        this.mListObjects = mListObjects;
        this.notifyDataSetChanged();
    }
    //endregion

    //region Class Holders

    class AdapterHolderType extends RecyclerView.ViewHolder {

        ImageView adapter_sample_recyclerview_iv;
        RelativeLayout rootview;
        TextView adapter_sample_recyclerview_tv;

        public AdapterHolderType(View itemView) {
            super(itemView);
            this.adapter_sample_recyclerview_tv = itemView.findViewById(R.id.adapter_sample_recyclerview_tv);
            this.rootview = itemView.findViewById(R.id.rootview);
            this.adapter_sample_recyclerview_iv = itemView.findViewById(R.id.adapter_sample_recyclerview_iv);
        }
    }

    //endregion
}