RecyclerView 打造简单的万能适配器Adapter(1)

• @param

• @return

*/

public V getView(int viewId){

View view = mViews.get(viewId);

if (null==view){

view = itemView.findViewById(viewId);

mViews.put(viewId,view);

}

return (V) view;

}

/**

• 创建ViewHolder

• @param context

• @param parent

• @param viewType

• @param layoutId

• @return

*/

public static BaseViewHolder createViewHolder(Context context,ViewGroup parent, int viewType,int layoutId){

View inflate = LayoutInflater.from(context).inflate(layoutId, parent, false);

return new BaseViewHolder(context,inflate);

}

public View getContentView(){

return mContentView;

}

public BaseViewHolder setText(int viewId, String text){

TextView tv = getView(viewId);

tv.setText(text);

return this;

}

public BaseViewHolder setImageView(int viewId, int resId){

ImageView imageView = getView(viewId);

imageView.setImageResource(resId);

return this;

}

public BaseViewHolder setImageView(int viewId, Drawable resId){

ImageView imageView = getView(viewId);

imageView.setImageDrawable(resId);

return this;

}

}

2.创建条目点击事件和子条目点击事件接口

/**

• @author LHW

• @date 2020/11/5.

• Description：

*/

public interface OnItemLongClickListener {

boolean onItemLongClick(@NonNull CommomBaseAdapter adapter, @NonNull View view, int position);

}

/**

• @author LHW

• @date 2020/11/5.

• Description：

*/

public interface OnItemClickListener {

void onItemClickListener(@NonNull CommomBaseAdapter<?, ?> adapter, @NonNull View view, int position);

}

/**

• @author LHW

• @date 2020/11/5.

• Description：

*/

public interface OnItemChildLongClickListener {

/**

• callback method to be invoked when an item in this view has been

• click and held

• @param adapter this CommomBaseAdapter adapter

• @param view The childView whihin the itemView that was clicked and held.

• @param position The position of the view int the adapter

• @return true if the callback consumed the long click ,false otherwise

*/

boolean onItemChildLongClick(@NonNull CommomBaseAdapter adapter, @NonNull View view, int position);

}

/**

• @author LHW

• @date 2020/11/5.

• Description：

*/

public interface OnItemChildClickListener {

/**

• callback method to be invoked when an item in this view has been

• click and held

• @param adapter this CommomBaseAdapter adapter

• @param view The childView whihin the itemView that was clicked and held.

• @param position The position of the view int the adapter

• @return true if the callback consumed the long click ,false otherwise

*/

boolean onItemChildLongClick(@NonNull CommomBaseAdapter adapter, @NonNull View view, int position);

}

/**

• @author LHW

• @date 2020/11/5.

• Description：

*/

public interface BaseListenerImp {

void setOnItemClickListener(@Nullable OnItemClickListener listener);

void setOnItemLongClickListener(@Nullable OnItemLongClickListener listener);

void setOnItemChildClickListener(@Nullable OnItemChildClickListener listener);

void setOnItemChildLongClickListener(@Nullable OnItemChildLongClickListener listener);

}

3. 实现万能适配器抽象类 CommomBaseAdapter

package com.lhw.common.adapter;

import android.content.Context;

import android.view.View;

import android.view.ViewGroup;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

import androidx.recyclerview.widget.RecyclerView;

import com.lhw.common.adapter.listener.OnItemChildClickListener;

import com.lhw.common.adapter.listener.OnItemChildLongClickListener;

import com.lhw.common.adapter.listener.OnItemClickListener;

import com.lhw.common.adapter.listener.OnItemLongClickListener;

import java.lang.ref.WeakReference;

import java.util.ArrayList;

import java.util.LinkedHashSet;

import java.util.List;

/**

• @author LHW

• @date 2020/11/5.

• Description：

*/

public abstract class CommomBaseAdapter<T, VH extends BaseViewHolder> extends RecyclerView.Adapter implements BaseListenerImp {

private List mData;//填充数据列表

private Context mContext;

private int mLayoutId;

private RecyclerView mRecyclerView;

private OnItemChildClickListener mOnItemChildClickListener;

private OnItemClickListener mOnItemClickListener;

private OnItemChildLongClickListener mOnItemChildLongClickListener;

private OnItemLongClickListener mOnItemLongClickListener;

LinkedHashSet childClickViewIds = new LinkedHashSet<>();//用于保存需要设置点击事件的 item

LinkedHashSet childLongClickViewIds =new LinkedHashSet<>();//用于保存需要设置长按点击事件的 item

public CommomBaseAdapter(List data, int layoutId) {

this.mData = data;

this.mLayoutId = layoutId;

}

/**

• 定义数据填充抽象函数

• @param holder

• @param position

• @param item

*/

protected abstract void setViewContent(@NonNull VH holder, int position, T item);

@Override

public void onAttachedToRecyclerView(@NonNull RecyclerView recyclerView) {

super.onAttachedToRecyclerView(recyclerView);

mContext = recyclerView.getContext();

mRecyclerView = recyclerView;

}

@NonNull

@Override

public VH onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

//创建绑定ViewHolder

BaseViewHolder viewHolder = BaseViewHolder.createViewHolder(mContext, parent, viewType, mLayoutId);

//绑定点击事件

bindViewClickListener((VH) viewHolder, viewType);

return (VH) viewHolder;

}

@Override

public void onBindViewHolder(@NonNull VH holder, int position) {

//实现抽象函数的数据绑定

setViewContent(holder, position,(T) getData().get(position));

}

/**

• 根据位置回去条目对象

• @param position

• @return

*/

public T getItem(int position){

if (!mData.isEmpty())

return mData.get(position);

return null;

}

/**对象获取条目是否存在

• 如果返回 -1，表示不存在

• @param item T?

• @return Int

*/

public int getItemPosition(T item) {

if (item != null && !mData.isEmpty())

return mData.indexOf(item);

return -1;

}

public LinkedHashSet getChildClickViewIds() {

return childClickViewIds;

}

public LinkedHashSet getChildLongClickViewIds() {

return childLongClickViewIds;

}

/**

• 添加子条目点击事件

• @param viewIds

*/

public void addChildClickViewIds(int … viewIds){

for (int viewId : viewIds) {

childClickViewIds.add(viewId);

}

}

/**

• 添加子条目长按点击事件

• @param viewIds

*/

public void addChildLongClickViewIds(int … viewIds){

for (int viewId : viewIds) {

childLongClickViewIds.add(viewId);

}

}

/**

• 绑定 item 点击事件

• @param holder VH

*/

protected void bindViewClickListener(final VH holder, int viewType) {

holder.itemView.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

setOnItemClick(holder.itemView, holder.getAdapterPosition());

}

});

holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {

@Override

public boolean onLongClick(View v) {

return setOnItemLongClick(holder.itemView, holder.getAdapterPosition());

}

});

for (Integer id : getChildClickViewIds()) {

holder.itemView.findViewById(id).setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

setOnItemChildClick(v,holder.getAdapterPosition());

}

});

}

for (Integer id : getChildLongClickViewIds()) {

holder.itemView.findViewById(id).setOnLongClickListener(new View.OnLongClickListener() {

@Override

public boolean onLongClick(View v) {

return setOnItemChildLongClick(v,holder.getAdapterPosition());

}

});

}

}

public List getData() {

if (null == mData) {

return new ArrayList<>();

}

return mData;

}

public void setData(List mData) {

this.mData = mData;

}

@Override

public int getItemCount() {

return mData.size();

}

/**

• override this method if you want to override click event logic

• 如果你想重新实现 item 点击事件逻辑，请重写此方法

• @param v

• @param position

*/

protected void setOnItemClick(View v, int position) {

mOnItemClickListener.onItemClickListener(this, v, position);

}

/**

• override this method if you want to override longClick event logic

• 如果你想重新实现 item 长按事件逻辑，请重写此方法

• @param v

• @param position

• @return

*/

protected boolean setOnItemLongClick(View v, int position) {

return mOnItemLongClickListener.onItemLongClick(this, v, position);

}

protected void setOnItemChildClick(View v, int position) {

mOnItemChildClickListener.onItemChildLongClick(this, v, position);

}

protected boolean setOnItemChildLongClick(View v, int position) {

return mOnItemChildLongClickListener.onItemChildLongClick(this, v, position);

}

@Override

public void setOnItemChildClickListener(@Nullable OnItemChildClickListener listener) {

mOnItemChildClickListener = listener;

}

@Override

public void setOnItemClickListener(@Nullable OnItemClickListener listener) {

mOnItemClickListener = listener;

}

@Override

public void setOnItemChildLongClickListener(@Nullable OnItemChildLongClickListener listener) {

mOnItemChildLongClickListener = listener;

}

@Override

public void setOnItemLongClickListener(@Nullable OnItemLongClickListener listener) {

mOnItemLongClickListener = listener;

}

public OnItemChildClickListener getOnItemChildClickListener() {

总结

算法知识点繁多，企业考察的题目千变万化，面对越来越近的“金九银十”，我给大家准备好了一套比较完善的学习方法，希望能帮助大家在有限的时间里尽可能系统快速的恶补算法，通过高效的学习来提高大家面试中算法模块的通过率。

这一套学习资料既有文字档也有视频，里面不仅仅有关键知识点的整理，还有案例的算法相关部分的讲解，可以帮助大家更好更全面的进行学习，二者搭配起来学习效果会更好。

部分资料展示：

有了这套学习资料，坚持刷题一周，你就会发现自己的算法知识体系有明显的完善，离大厂Offer的距离更加近。
《Android学习笔记总结+移动架构视频+大厂面试真题+项目实战源码》，点击传送门，即可获取！
ic void setOnItemLongClickListener(@Nullable OnItemLongClickListener listener) {

mOnItemLongClickListener = listener;

}

public OnItemChildClickListener getOnItemChildClickListener() {

总结

算法知识点繁多，企业考察的题目千变万化，面对越来越近的“金九银十”，我给大家准备好了一套比较完善的学习方法，希望能帮助大家在有限的时间里尽可能系统快速的恶补算法，通过高效的学习来提高大家面试中算法模块的通过率。

这一套学习资料既有文字档也有视频，里面不仅仅有关键知识点的整理，还有案例的算法相关部分的讲解，可以帮助大家更好更全面的进行学习，二者搭配起来学习效果会更好。

部分资料展示：

[外链图片转存中…(img-cOtVUIus-1715137707877)]
[外链图片转存中…(img-buWVw8Bg-1715137707878)]
[外链图片转存中…(img-XWo17RZZ-1715137707878)]
[外链图片转存中…(img-ttrdN715-1715137707879)]

有了这套学习资料，坚持刷题一周，你就会发现自己的算法知识体系有明显的完善，离大厂Offer的距离更加近。
《Android学习笔记总结+移动架构视频+大厂面试真题+项目实战源码》，点击传送门，即可获取！