Android--RecyclerView的封装使用-白红宇

Android--RecyclerView的封装使用

阅读量：6150 次

发布时间：2019-06-21

本文共 9650 字，大约阅读时间需要 32 分钟。

1，用了很长一段时间的RecyclerView,在项目中用的频率也越来越频繁（因为踩得坑也越来越多了），或过头来看，感觉一直在写RecyclerView.Adapter中的三个方法和一个内部类，感觉很浪费时间，那么今天我们来试着封装封装，来减少我们的使用

先看一下我们的实现效果：

2，我们来简单的写一写吧，首先我们按照以前的方式写的话，看看有哪些代码，我们先来发出来看看

UserSimpleRecyclerAdapter.java

package com.qianmo.myview2.base;import android.content.Context;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import com.qianmo.myview2.R;import com.qianmo.myview2.bean.UserBean;import org.w3c.dom.Text;import java.util.List;/** * Created by wangjitao on 2016/11/7 0007. */public class UserSimpleRecycleAdapter extends RecyclerView.Adapter
     
       {    private Context context;    private LayoutInflater inflater;    private List
      
        datas;    public UserSimpleRecycleAdapter(Context context, List
       
         datas) {        this.context = context;        this.inflater = LayoutInflater.from(context);        this.datas = datas;    }    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View itemView = inflater.inflate(R.layout.item_user, parent, false);        ViewHolder holder = new ViewHolder(itemView);        return holder;    }    @Override    public void onBindViewHolder(ViewHolder holder, int position) {        holder.tv_name.setText(datas.get(position).getName());        holder.tv_age.setText(datas.get(position).getAge());    }    @Override    public int getItemCount() {        return datas == null ? 0 : datas.size();    }    public class ViewHolder extends RecyclerView.ViewHolder {        TextView tv_name;        TextView tv_age;        public ViewHolder(View itemView) {            super(itemView);            tv_name = (TextView) itemView.findViewById(R.id.tv_name);            tv_age = (TextView) itemView.findViewById(R.id.tv_age);        }    }}

　可以看到 getItemCount（）、onCreateViewHolder（）、onBindViewHolder（）再加上ViewHolder内部类是我们必须要写的，但是写长了我们就可以感觉到 getItemCount（）是基本上代码相同的，一般在onCreateViewHolder中创建ViewHolder，在onBindViewHolder中写数据和逻辑，而我们程序员最管关心什么呢就是数据和逻辑的处理啊，如果我们创建一个适配器只用写我们的逻辑的话，那我们每天都可以省下好多时间来打一把lol了，现在带大家一步一步封装吧！

首先看一下我们最关键的BaseViewHolder

BaseViewHolder.java

package com.qianmo.myview2.base;import android.support.v7.widget.RecyclerView;import android.util.SparseArray;import android.view.View;/** * Created by wangjitao on 2016/11/7 0007. * 万能的Viewholder */public class BaseViewHolder extends RecyclerView.ViewHolder {    private SparseArray
     
       views;    public BaseViewHolder(View view) {        super(view);        this.views = new SparseArray<>();    }    public 
      
        T getView(int viewId) {        View view = views.get(viewId);        if (view == null) {            view = itemView.findViewById(viewId);            views.put(viewId, view);        }        return (T) view;    }    public View getRootView() {        return itemView;    }}

　其实里面重要的就是views属性和getView（）方法，getView方法中用户通过传递控件的id然后首先会去views这个集合中去拿，如果没有的话说明是我们的头部，这样就解决了多次findView的问题，好像里面也没什么难懂的，大家就看看吧。

再看一下我们的抽象类BaseRecycleViewAdapter

　BaseRecycleViewAdapter.java

package com.qianmo.myview2.base;import android.content.Context;import android.support.v7.widget.RecyclerView;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import com.balysv.materialripple.MaterialRippleLayout;import com.qianmo.myview2.R;import java.util.List;/** * Created by wangjitao on 2016/11/7 0007. * 对简单的recycleview进行简单的封装 */public abstract class BaseRecyclerViewAdapter
     
       extends RecyclerView.Adapter
      
        {    private Context context;    private LayoutInflater inflater;    private List
       
         datas;    private int layoutId;    protected OnItemClickListner onItemClickListner;//单击事件    protected OnItemLongClickListner onItemLongClickListner;//长按单击事件    private boolean clickFlag = true;//单击事件和长单击事件的屏蔽标识    public BaseRecyclerViewAdapter(Context context, List
        
          datas, int layoutId) {        this.context = context;        this.datas = datas;        this.layoutId = layoutId;        this.inflater = LayoutInflater.from(context);    }    @Override    public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        BaseViewHolder holder = new BaseViewHolder(inflater.inflate(layoutId, parent, false));        MaterialRippleLayout.on(holder.getView(R.id.ll_all))                .rippleOverlay(true)                .rippleAlpha(0.2f)                .rippleColor(context.getResources().getColor(R.color.colorAccent))                .rippleHover(true)                .create();        return holder;    }    @Override    public void onBindViewHolder(BaseViewHolder holder, int position) {        bindData(holder, datas.get(position), position);    }    @Override    public int getItemCount() {        return datas == null ? 0 : datas.size();    }    protected abstract void bindData(BaseViewHolder holder, T data, int position);    public void setOnItemClickListner(OnItemClickListner onItemClickListner) {        this.onItemClickListner = onItemClickListner;    }    public void setOnItemLongClickListner(OnItemLongClickListner onItemLongClickListner) {        this.onItemLongClickListner = onItemLongClickListner;    }    public interface OnItemClickListner {        void onItemClickListner(View v, int position);    }    public interface OnItemLongClickListner {        void onItemLongClickListner(View v, int position);    }}

　我们在里面处理了onCreateViewHolder和getItemCount这两个我们一直写的方法，通过抽象方法把我们最重要的onBindViewHolder方法暴露出去，这样我们就可以在暴露出去的bindData（）方法中去处理逻辑了，并且添加了创建的Item点击事件和长按事件。

　我们写一个简单的用户展示列表看看效果如何，创建UserAdapter.java，看一下代码：

package com.qianmo.myview2.base;import android.content.Context;import android.view.View;import android.widget.LinearLayout;import android.widget.TextView;import com.qianmo.myview2.R;import com.qianmo.myview2.bean.UserBean;import java.util.List;/** * Created by Administrator on 2016/11/7 0007. */public class UserAdapter extends BaseRecyclerViewAdapter
     
       {    public UserAdapter(Context context, List
      
        datas, int layoutId) {        super(context, datas, layoutId);    }    @Override    protected void bindData(final BaseViewHolder holder, UserBean data, final int position) {        LinearLayout ll_all = (LinearLayout) holder.getView(R.id.ll_all);        TextView tv_name = (TextView) holder.getView(R.id.tv_name);        TextView tv_age = (TextView) holder.getView(R.id.tv_age);        tv_age.setText(data.getAge());        tv_name.setText(data.getName());        ll_all.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                if (onItemClickListner != null) {                    onItemClickListner.onItemClickListner(holder.getRootView(), position);                }            }        });    }}

　　就问一句爽不爽，只需要写一个方法了，还有谁！

再把完整的代码贴出来一下

UserBean.java

package com.qianmo.myview2.bean;/** * Created by Administrator on 2016/11/7 0007. */public class UserBean {    public UserBean(String name, String age) {        this.name = name;        this.age = age;    }    private String name;    private String age;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getAge() {        return age;    }    public void setAge(String age) {        this.age = age;    }}

　item_user.xml

　　MainActivity.java

package com.qianmo.myview2;import android.content.Context;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.view.View;import android.widget.Toast;import com.qianmo.myview2.base.BaseRecyclerViewAdapter;import com.qianmo.myview2.base.UserAdapter;import com.qianmo.myview2.base.UserSimpleRecycleAdapter;import com.qianmo.myview2.bean.UserBean;import java.util.ArrayList;import java.util.List;import butterknife.Bind;import butterknife.ButterKnife;public class MainActivity extends AppCompatActivity implements BaseRecyclerViewAdapter.OnItemClickListner {    private RecyclerView recycleView;    private Context mContext = MainActivity.this;    private UserAdapter mAdapter;    private UserSimpleRecycleAdapter mUserSimpleRecycleAdapter;    private List
     
       datas;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        recycleView = (RecyclerView) findViewById(R.id.recycleView);        initView();    }    private void initData() {        datas = new ArrayList<>();        for (int i = 0; i < 15; i++) {            datas.add(new UserBean("wangjtiao", "" + i));        }    }    private void initView() {        initData();        LinearLayoutManager mLinearLayoutManager = new LinearLayoutManager(mContext);        mLinearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);        recycleView.setLayoutManager(mLinearLayoutManager);        mAdapter = new UserAdapter(mContext, datas, R.layout.item_user);        mAdapter.setOnItemClickListner(this);//        mUserSimpleRecycleAdapter = new UserSimpleRecycleAdapter(mContext, datas);        recycleView.setAdapter(mAdapter);    }    @Override    public void onItemClickListner(View v, int position) {        Toast.makeText(mContext, datas.get(position).getName() + ":" + datas.get(position).getAge() + ":" + position, Toast.LENGTH_SHORT).show();    }}

　　ok,这样我们就封装完了·······

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