上一篇介紹的了RecyclerView的基礎使用http://blog.csdn.net/leejizhou/article/details/50670657，這一篇給大家介紹下如何利用RecyclerView實現多Item佈局的載入，多Item佈局的載入的意思就是在開發過程中List的每一項可能根據需求的不同會載入不同的Layout，看下Demo效果的演示。

* 圖片資源版權歸屬於Facebook dribbble

RecyclerView實現載入不同的Layout的核心就是在Adapter的onCreateViewHolder裡面去根據需求而載入不同的佈局。

具體的實現步驟：（以Android Studio作為開發工具）

1：Gradle配置 build.gradle

這裡cardview也是一種新的佈局容器，上一篇有介紹。

compile 'com.android.support:recyclerview-v7:23.1.1'
compile 'com.android.support:cardview-v7:23.1.1'

2：建立列表的佈局 activity_recyclerview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 

    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.v7.widget.RecyclerView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id
 
="@+id/rv_list"
        />
</LinearLayout>

由於需要多種item Layout的載入，我們需要建立2個item佈局

3：建立列表Item項的佈局（1） item1.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp"
    android:id="@+id/cv_item"
    android:foreground="?android:attr/selectableItemBackground"
    card_view:cardCornerRadius="4dp"
    card_view:cardBackgroundColor="#ffffff"
    card_view:cardElevation="4dp"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >
        <ImageView
            android:id="@+id/iv_item1_pic"
            android:layout_width="match_parent"
            android:layout_height="120dp"
            android:layout_weight="1"
            android:background="@mipmap/lighthouse"
            />
        <TextView
            android:id="@+id/tv_item1_text"
            android:padding="20dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

</android.support.v7.widget.CardView>

4：建立列表Item項的佈局（2） item2.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp"
    android:foreground="?android:attr/selectableItemBackground"
    card_view:cardCornerRadius="4dp"
    card_view:cardBackgroundColor="#E040FB"
    card_view:cardElevation="4dp"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >

        <TextView
            android:id="@+id/tv_item2_text"
            android:padding="20dp"
            android:textColor="#ffffff"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
    </LinearLayout>

</android.support.v7.widget.CardView>

*最重要的部分 Adapter

5：建立RecyclerView的Adapter,RecyclerViewAdapter.java

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;

/**
 * Created by Lijizhou on 2016/2/21.
 */
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private LayoutInflater mLayoutInflater;
    private Context context;
    private String [] titles;
    //建立列舉 2個item 型別
    public enum ITEM_TYPE {
        ITEM1,
        ITEM2
    }

    public RecyclerViewAdapter(Context context,String[] titles){
        this.titles = titles;
        this.context = context;
        mLayoutInflater = LayoutInflater.from(context);
    }


    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        //載入Item View的時候根據不同TYPE載入不同的佈局
        if (viewType == ITEM_TYPE.ITEM1.ordinal()) {
            return new Item1ViewHolder(mLayoutInflater.inflate(R.layout.item1, parent, false));
        } else {
            return new Item2ViewHolder(mLayoutInflater.inflate(R.layout.item2, parent, false));
        }
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof Item1ViewHolder) {
            ((Item1ViewHolder) holder).mTextView.setText(titles[position]);
        } else if (holder instanceof Item2ViewHolder) {
            ((Item2ViewHolder) holder).mTextView.setText(titles[position]);
        }
    }



    //設定ITEM型別，可以自由發揮，這裡設定item position單數顯示item1 偶數顯示item2
    @Override
    public int getItemViewType(int position) {
        //Enum類提供了一個ordinal()方法，返回列舉型別的序數，這裡ITEM_TYPE.ITEM1.ordinal()代表0， ITEM_TYPE.ITEM2.ordinal()代表1
        return position % 2 == 0 ? ITEM_TYPE.ITEM1.ordinal() : ITEM_TYPE.ITEM2.ordinal();
    }

    @Override
    public int getItemCount() {
        return titles == null ? 0 : titles.length;
    }

    //item1 的ViewHolder
    public static class Item1ViewHolder extends RecyclerView.ViewHolder{
        TextView mTextView;
        public Item1ViewHolder(View itemView) {
            super(itemView);
            mTextView=(TextView)itemView.findViewById(R.id.tv_item1_text);
        }
    }
    //item2 的ViewHolder
    public static class Item2ViewHolder extends RecyclerView.ViewHolder{

        TextView mTextView;
        public Item2ViewHolder(View itemView) {
            super(itemView);
            mTextView=(TextView)itemView.findViewById(R.id.tv_item2_text);
        }
    }
}

OK，Adapter建立好了，那麼最後一步就是在Activity裡面進行相關操作

6：列表頁面的類檔案 RecyclerViewActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;

/**
 * Created by Lijizhou on 2016/2/21.
 */
public class RecyclerViewActivity extends AppCompatActivity {
    private RecyclerView mRecyclerView;
    //item 顯示所需(僅供DEMO)
    private String[] title = {"Blog : http://blog.csdn.net/Leejizhou.",
            "A good laugh and a long sleep are the best cures in the doctor's book.",
            "all or nothing, now or never ",
            "Be nice to people on the way up, because you'll need them on your way down.",
            "Be confident with yourself and stop worrying what other people think. Do what's best for your future happiness!",
            "Blessed is he whose fame does not outshine his truth.",
            "Create good memories today, so that you can have a good past"
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recyclerview);
        mRecyclerView=(RecyclerView)findViewById(R.id.rv_list);
        //這裡根據上一個頁面的傳入值來載入LIST或GRID，上一個頁面僅僅2個按鈕，參考演示DEMO
        if (getIntent().getIntExtra("type", 0) == 1){
            //List
            LinearLayoutManager layoutManager = new LinearLayoutManager(this);
            layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
            mRecyclerView.setLayoutManager(layoutManager);

        }else if(getIntent().getIntExtra("type", 0) == 2){
            //grid
            mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2));
        }
        //RecyclerView設定Adapter
        mRecyclerView.setAdapter(new RecyclerViewAdapter(this, title));


    }
}

Ok，這樣RecyclerView的多Item佈局的載入就實現，本篇DEMO的原始碼 http://download.csdn.net/detail/leejizhou/9438282 有問題可以在下方留言，也可以加我的QQ:3107777777來討論。