打开RecyclerView的正确姿势

先说下效果,整个首页是一个RecyclerView实现的,我把它分为头部分，和title部分，和内容部分，都是通过getItemViewType这个方法来实现,至于脚布局相信添加完头布局之后都非常简单了

上代码：activity_main的xml

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="#ffffff"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
LinearLayout>

adapter 数据自己传吧，但是注意头布局和title都是占着索引的

package thinklock.stringtech.cn.thinklock.adapter;

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.LinearLayout;
import android.widget.TextView;

import thinklock.stringtech.cn.thinklock.R;

import static android.view.View.inflate;

/**
 * Created by chen on 2017  首页  多条目
 */

public class HomeRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements View.OnClickListener {
    private String[] contents;//标题数据加内容数据的数组
    private Integer[] imgs;//内容数据的图片

    public HomeRecyclerViewAdapter(String[] contents, Integer[] imgs) {
        this.contents = contents;
        this.imgs = imgs;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == 1) {//title
            View title = inflate(parent.getContext(), R.layout.home_item_title, null);
            return new VH1(title);
        } else if (viewType == 0) {//头布局
            View head = inflate(parent.getContext(), R.layout.activity_home_head, null);
            return new VH3(head);
        } else {//内容布局
            View content = LayoutInflater.from(parent.getContext()).inflate(R.layout.home_item_content, null, false);
            return new VH2(content);
        }
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder myHolder, final int position) {
        int itemViewType = getItemViewType(position);
        if (itemViewType == 1) {
            //標題佈局
            ((VH1) myHolder).mTvTitle.setText("  " + contents[position]);
        } else if (itemViewType == 0) {
            //头布局
            ((VH3) myHolder).ivUserInfo.setOnClickListener(this);
            ((VH3) myHolder).ivBack.setOnClickListener(this);
        } else {
            //内容布局
            ((VH2) myHolder).mTvContent.setText(contents[position]);
            ((VH2) myHolder).mIvImg.setImageResource(imgs[position]);//这里的数据自己传吧，但是注意头布局和title都是占着索引的
            ((VH2) myHolder).layoutContent.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (mOnItemClick != null) {
                        mOnItemClick.onClick(position);
                    }
                }
            });
        }
    }

    @Override
    public int getItemViewType(int position) {
        if (position == 0) {
            return 0;//头布局
        } else if (position == 1 || position == 5) {
            return 1;//标题布局
        } else {
            return 2;//内容布局
        }
    }

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

    /**
     * 头布局点击事件接口回调出去 让外部处理
     * @param v
     */
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.ivBack:
                if (mOnItemClick != null) {
                    mOnItemClick.headOnClick(R.id.ivBack);
                }
                break;
            case R.id.ivUserInfo:
                if (mOnItemClick != null) {
                    mOnItemClick.headOnClick(R.id.ivUserInfo);
                }
                break;
        }
    }

    class VH1 extends RecyclerView.ViewHolder {
        private TextView mTvTitle;

        public VH1(View itemView) {
            super(itemView);
            mTvTitle = (TextView) itemView.findViewById(R.id.tvTitle);
        }
    }

    class VH2 extends RecyclerView.ViewHolder {
        private TextView mTvContent;
        private ImageView mIvImg;
        private LinearLayout layoutContent;

        public VH2(View itemView) {
            super(itemView);
            mTvContent = (TextView) itemView.findViewById(R.id.tvContent);
            mIvImg = (ImageView) itemView.findViewById(R.id.ivImg);
            layoutContent = (LinearLayout) itemView.findViewById(R.id.layoutContent);
        }
    }

    class VH3 extends RecyclerView.ViewHolder {
        private ImageView ivBack;
        private ImageView ivUserInfo;

        public VH3(View itemView) {
            super(itemView);
            ivBack = (ImageView) itemView.findViewById(R.id.ivBack);
            ivUserInfo = (ImageView) itemView.findViewById(R.id.ivUserInfo);
        }
    }

    /**
     * 接口回调
     */
    public interface OnItemClick {
        //内容的点击事件回调方法
        void onClick(int position);
        //头布局的点击事件回调方法
        void headOnClick(int id);
    }

    private OnItemClick mOnItemClick;

    public void onItemClick(OnItemClick onItemClick) {
        mOnItemClick = onItemClick;
    }
}

head的xml activity_home_head

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:background="@mipmap/main_bg"
              android:orientation="vertical"
              android:layout_height="200dp">

LinearLayout>

title的xml home_item_title

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">
    <TextView
        android:singleLine="true"
        android:padding="10dp"
        android:id="@+id/tvTitle"
        android:textColor="#000000"
        android:layout_width="match_parent"
        android:background="#FFF2F1F0"
        android:text="---"
        android:textSize="17sp"
        android:layout_height="wrap_content"/>
LinearLayout>

内容的xml home_item_content

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:gravity="center"
              android:id="@+id/layoutContent"
              android:paddingTop="20dp"
              android:paddingBottom="20dp"
              android:layout_width="match_parent"
              android:layout_height="match_parent">
    <ImageView
        android:background="@mipmap/login_user_icon"
        android:id="@+id/ivImg"
        android:layout_width="45dp"
        android:layout_height="45dp"/>
    <TextView
        android:singleLine="true"
        android:id="@+id/tvContent"
        android:layout_margin="5dp"
        android:textColor="#000000"
        android:layout_width="wrap_content"
        android:text="测试"
        android:layout_height="wrap_content"/>
LinearLayout>

最后设置一下adapter即可

private void initRecyclerView() {
        /**
         * 使用RecyclerView的网格布局加多条目展示
         */
        final GridLayoutManager gridLayoutManager = new GridLayoutManager(this, 3);//显示几列自己修改即可
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                //获取我们在adapter中复写的type
                int type = mRecyclerView.getAdapter().getItemViewType(position);
                if (type == 1) {//是title 需要占用全部
                    return gridLayoutManager.getSpanCount();//也就是上面的3  占用全部
                } else if (type == 0) {//是头布局 需要占用全部
                    return gridLayoutManager.getSpanCount();//也就是上面的3  占用全部
                } else {//内容布局
                    return 1;//占用3/1
                }
            }
        });
        mRecyclerView.setLayoutManager(gridLayoutManager);
        if (mAdapter == null) {
        //数据自己传吧
            mAdapter = new HomeRecyclerViewAdapter(Contants.mStateContent, Contants.mStateImages);
            mRecyclerView.setAdapter(mAdapter);
        }
        //通过接口回调处理recycleview的item点击事件
        mAdapter.onItemClick(new HomeRecyclerViewAdapter.OnItemClick() {
            //内容的点击事件
            @Override
            public void onClick(int position) {
            //注意title和头布局也是占着position的。。。
                initClick(position);
            }

            /**
             * 头部布局的点击事件
             * @param id
             */
            @Override
            public void headOnClick(int id) {
               //如果你的头布局上面有点击事件，比如用户的头像或者设置什么的，可以在这里处理，没有则不处理
            }
        });
    }