MultiTypeView

1.简化RecyclerView的多种type的adapter

2.ViewHolder的创建和绑定被提取出来变成ItemViewProvider，可以被多个adapter复用

3.支持一种数据对应多种ItemViewProvider

4.Fragment可以添加到RecyclerView上，实现复杂的界面

对于复杂的界面非常有利，一个复杂的界面可以分成多个Fragment，一个项目组分配给多个人开发.

5.RecyclerView上的Fragment是显示时候才加载

具有懒加载的效果.假设RecyclerView上放了10个Fragment，你进去的时候只加载到开始的1,2个Fragment

6.支持全局注册ItemViewProvider，和局部注册，和局部覆盖注册.

7.列表的数据保存和恢复，以及fragment的保存和恢复

Download sample Apk

效果图

关系图

使用方法

实现ItemViewProvider

public class MessageLeftProvider extends ItemViewProvider<Message> {

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(LayoutInflater inflater, ViewGroup parent, int providerType) {
        return new ItemViewHolder(inflater.inflate(R.layout.item_message_left, parent, false));
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, Message message) {
        ItemViewHolder vh = (ItemViewHolder) viewHolder;
        vh.textView.setText(message.text);
    }

    private class ItemViewHolder extends RecyclerView.ViewHolder {

        private final TextView textView;

        public ItemViewHolder(View itemView) {
            super(itemView);
            textView = (TextView) itemView.findViewById(R.id.item_message_textView);
        }
    }
}

Activity代码

public class LongPageActivity extends AppCompatActivity {
    private MultiTypeAdapter<Object> multiTypeAdapter;
    private MultiTypeView multiTypeView;
    private String myUserId = "1";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_long_page);
        multiTypeView = (MultiTypeView) findViewById(R.id.multiTypeView);
        //带有FragmentManager的构造函数，默认帮您添加支持Fragment数据的FragmentHolderProvider
        //也就是说你可以把Fragment放在adapter上使用，这里的Fragment只有第一次滑动到对应位置才会onCreateView的方法
        ItemBinderFactory itemBinderFactory = new ItemBinderFactory(getSupportFragmentManager());
        //有时候需要根据TextItem里面的某个字段，生成不同的布局.比如聊天界面的message是一样的，但是有区分左右布局
        //ItemProviderSet可以通过数据类型区分无数种情况的Provider
       itemBinderFactory.registerProvider(Message.class, new ItemViewProviderSet<Message>(new MessageProvider(MessageProvider.ALIGN_LEFT), new MessageProvider(MessageProvider.ALIGN_RIGHT)) {
                  @Override
                  protected int selectIndex(Message message) {
                      return myUserId.equals(message.userId) ? 1 : 0;
                  }
        });
        multiTypeAdapter = new MultiTypeAdapter<>(loadData(0), itemBinderFactory);
        multiTypeView.setAdapter(multiTypeAdapter);
    }

    private List<Object> loadData(int page) {
        List<Object> data = new ArrayList<>();
        TextView textView = new TextView(this);
        textView.setText("第" + page + "页");
        textView.setGravity(Gravity.CENTER);
        textView.setBackgroundColor(Color.GRAY);
        textView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, DisplayUtils.dipToPix(this, 100)));
        data.add(textView);
        data.add(new Message("1", "今天这个状态有所保留么？"));
        data.add(new Message("2", "没有保留！我已经，我已经用了洪荒之力啦！"));
        data.add(new FragmentData(InfoLazyFragment.class, "InfoLazyFragment" + page));
        data.add(new FragmentData(EditLazyFragment.class, "EditLazyFragment" + page));
        data.add(new FragmentData(HotelLazyFragment.class, "HotelLazyFragment" + page));
        data.add(new FragmentData(AirlineTicketLazyFragment.class, "AirlineTicketLazyFragment" + page));
        data.add(new FragmentData(ShopLazyFragment.class, "ShopLazyFragment" + page));
        data.add(new FragmentData(RecommendLazyFragment.class, "RecommendLazyFragment" + page));
        data.add(new FragmentData(FoodLazyFragment.class, "FoodLazyFragment" + page));
        data.add(new FragmentData(CultureLazyFragment.class, "CultureLazyFragment" + page));
        this.page = page;
        return data;
    }
}  

很简单吧，三个步骤

1.实现ItemViewProvider并注册到ItemBinderFactory上

2.然后设置MultiTypeAdapter

3.添加数据

Gradle

compile 'com.shizhefei:MultiTypeView:1.0.1'
由于用到了v4和recyclerview所以也要导入他们  
compile 'com.android.support:support-v4:23.4.0'  
compile 'com.android.support:recyclerview-v7:23.2.1'  

说明

本项目是根据 https://github.com/drakeet/MultiType 类库的想法
把ViewHolder的创建以ItemViewProvider的形式分离出来 ，以及参考了部分代码实现.

之后我添加了Fragment添加到RecyclerView上功能，以及view以数据的形式也可以添加上去.还有就是全局注册和局部注册的方案，ItemViewProviderSet实现了相同数据类型不同的ItemViewProvider.