如題，本文主要介紹RecyclerView的基本使用方法，像ListView一樣展示多種型別的Item資料。

首先介紹一下實體類：ItemPO，用來表示每個Item代表的資料型別：

package com.example.cxc.fullscreendemo.decoration.po;

import java.io.Serializable;

public class ItemPO implements Serializable {
    private static final long serialVersionUID = 7879752396036182745L;

    private String name;
    private int age;

    public ItemPO(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }
}
 

其次，介紹一下測試的Activity頁面，其佈局activity_recycler_view_test.xml及RecyclerViewTestActivity如下：

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

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

package com.example.cxc.fullscreendemo.decoration;

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

import com.example.cxc.fullscreendemo.R;
import com.example.cxc.fullscreendemo.decoration.adapter.RecyclerViewTestAdapter;
import com.example.cxc.fullscreendemo.decoration.po.ItemPO;

import java.util.ArrayList;
import java.util.List;

public class RecyclerViewTestActivity extends AppCompatActivity {
    private static final String TAG = "RecyclerViewTestActivity";

    private RecyclerView mRecyclerView;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //設定佈局
        setContentView(R.layout.activity_recycler_view_test);

        mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        //設定LayoutManager
        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(layoutManager);

        //設定Adapter
        RecyclerViewTestAdapter adapter = new RecyclerViewTestAdapter();
        mRecyclerView.setAdapter(adapter);

        //設定資料
        List<ItemPO> items = fakeItems();
        adapter.notifyDataSetChanged(items);
    }


    private static final int ITEM_COUNT = 100;

    private static List<ItemPO> fakeItems() {
        List<ItemPO> items = new ArrayList<>(ITEM_COUNT);

        for (int i = 0; i < ITEM_COUNT; i++) {
            ItemPO tItem = new ItemPO("Name_" + i, i);
            items.add(tItem);
        }

        return items;
    }
}
 

佈局及Activity中的邏輯都很簡單明瞭，構造了100個使用者資訊Item用來展示。為了UI介面的豐富性，年齡為偶數的Item，名字和年齡分兩行展示，年齡為奇數的Item名字和年齡在一行展示。如何構造ItemView並展示資料，需要使用Adapter來完成,即RecyclerViewTestAdapter。

package com.example.cxc.fullscreendemo.decoration.adapter;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.cxc.fullscreendemo.R;
import com.example.cxc.fullscreendemo.decoration.po.ItemPO;

import java.util.List;

public class RecyclerViewTestAdapter extends RecyclerView.Adapter<TestBaseViewHolder> {
    private static final int TYPE_1 = 1;//橫向排列名字和年齡
    private static final int TYPE_2 = 2;//豎向排列名字和年齡

    private List<ItemPO> items;

    @Override
    public int getItemViewType(int position) {
        ItemPO item = getItem(position);
        //age是奇數時使用TYPE_1,偶數時使用TYPE_2;
        return item != null && item.getAge() % 2 == 0 ? TYPE_2 : TYPE_1;
    }

    @Override
    public TestBaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        TestBaseViewHolder holder = null;
        switch (viewType) {
            case TYPE_1:
                View itemView1 = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_type_1_layout, parent, false);
                holder = new TestViewHolder(itemView1);
                break;
            case TYPE_2:
                View itemView2 = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_type_2_layout, parent, false);
                holder = new TestViewHolder(itemView2);
                break;
        }
        return holder;
    }

    @Override
    public void onBindViewHolder(TestBaseViewHolder holder, int position) {
        ItemPO item = getItem(position);
        holder.fillData(item);
    }

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

    public ItemPO getItem(int position) {
        return position >= 0 && position < getItemCount() ? items.get(position) : null;
    }

    public void notifyDataSetChanged(List<ItemPO> items) {
        this.items = items;
        notifyDataSetChanged();
    }
}

其中:

public int getItemViewType(int position) :返回position位置的Item的ViewType,以便ItemView回收利用；

public int getItemCount()：DataSet中資料Item的個數；

public TestBaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType)：根據viewType返回相應的ViewHolder,也就是建立不同UI的ItemView;

public void onBindViewHolder(TestBaseViewHolder holder, int position):將DataSet中position位置的資料填充至該ViewHolder中展示；

執行結果如下圖如示，其中紅色/藍色各代表一個使用者資訊，紅色：名字和年齡各佔一行展示；藍色：名字和年齡共佔一行展示；

可以根據getItemViewType()返回值在onCreateViewHolder()中建立各種各樣的Ui樣式，然後在onBindViewHolder()中將資料填充展示。

完整示例請參考：