Android的数据绑定RecyclerView：灵活的方式

这个库提供了简单灵活的方式配置RecyclerView使用android数据绑定。

将库添加为gradle依赖关系

    repositories {

        jcenter()
    }
    dependencies {
        compile 'com.drextended.rvdatabinding:rvdatabinding:1.1.0'
    }

    // Don't forget to enable data binding
    dataBinding {
        enabled = true
    }

特征

• .ListConfig - 简单的构造器配置RecyclerView。
• .BindableAdapter - 简单的Recycler View适配器用于与数据绑定。
• .BindingHolder - 用于数据绑定的简单查看持有人。
• .DividerItemDecoration - RecyclerView的简单分隔装饰。
• .ColorDividerItemDecoration - 简单的彩色分隔线装饰RecyclerView。
• .LoadMoreScrollListener - 简单的RecyclerView ScrollListener实现延迟加载列表（无尽列表）。
• .TwoWayLoadingScrollListener - 简单的RecyclerView ScrollListener实现双向延迟加载列表（无尽列表）。
• .BaseBindingAdapterDelegate - 基本RecyclerView项目委托使用数据绑定。
• .ModelItemDelegate - 通用ActionDelegate。如果你不想实现自定义一个，你可以使用这一个。

用法

首先，你肯定应该有项目的pojo模型

     public class User implements BaseModel {

        public String name;
        public String avatar;
    }
    public class Location implements BaseModel {
        public String name;
        public String image;
    }
    public class Advertisement implements BaseModel {
        public String label;
        public String image;
    }

2.然后，您应该为每个项目和列表页面创建布局

fragment_page.xml

     <layout ...>

        <data>
            <variable
                name="viewModel"
                type="com.drextended.rvdbsample.viewmodel.ListViewModel"/>
        </data>

        <android.support.v7.widget.RecyclerView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:listConfig="@{viewModel.getListConfig()}"/>

    </layout>

item_user.xml

    <layout xmlns:...>

        <data>
            <import type="com.drextended.rvdbsample.model.ActionType"/>

            <variable
                name="user"
                type="com.drextended.rvdbsample.model.User"/>

            <variable
                name="actionHandler"
                type="com.drextended.actionhandler.listener.ActionClickListener"/>
        </data>

        <android.support.v7.widget.CardView
            ...
            app:actionHandler="@{actionHandler}"
            app:actionType="@{ActionType.OPEN}"
            app:actionTypeLongClick="@{ActionType.MENU}"
            app:model="@{user}">

            <FrameLayout ...>

                <ImageView
                    ...
                    app:glideAnimation="@{R.anim.scale_in}"
                    app:glideCacheStrategy='@{"RESULT"}'
                    app:glidePath="@{user.avatar}"
                    app:glidePlaceholder="@{@android:drawable/ic_menu_gallery}"
                    app:glideTransform='@{"CIRCLE"}'
                    tools:src="@android:drawable/ic_menu_gallery"/>

                <TextView
                    ...
                    android:text="@{user.name}"/>

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

同为item_location.xml和item_advertisement.xml

3.然后如果您不想使用泛型，请为项目创建ItemDelegates

UserDelegate.java

     public class UserDelegate extends ActionAdapterDelegate<BaseModel, ItemUserBinding> {

        public UserDelegate(final ActionClickListener actionHandler) {
            super(actionHandler);
        }

        @Override
        public boolean isForViewType(@NonNull final List<BaseModel> items, final int position) {
            return items.get(position) instanceof User;
        }

        @NonNull
        @Override
        public BindingHolder<ItemUserBinding> onCreateViewHolder(final ViewGroup parent) {
            return BindingHolder.newInstance(R.layout.item_user, LayoutInflater.from(parent.getContext()), parent, false);
        }

        @Override
        public void onBindViewHolder(@NonNull final List<BaseModel> items, final int position, @NonNull final BindingHolder<ItemUserBinding> holder) {
            final User user = (User) items.get(position);
            holder.getBinding().setUser(user);
            holder.getBinding().setActionHandler(getActionHandler());
        }

        @Override
        public long getItemId(final List<BaseModel> items, final int position) {
            return items.get(position).getId();
        }
    }

4.在你的viewmodel中组装所有这些

AllInOneListViewModel.java

    //使用的动作处理库处理中的项目点击/长按：https://github.com/drstranges/ActionHandler 
    final ActionClickListener actionHandler = new ActionHandler.Builder()

            //.addAction(null, new SimpleAnimationAction()) // Applied for any actionType
            //.addAction(null, new TrackAction()) // Applied for any actionType
            .addAction(ActionType.OPEN, new OpenProfileAction())
            .addAction(ActionType.MENU, new CompositeAction<String>(
                    (context, model) -> getTitle(model),
                    new ActionItem(ActionType.MENU_ITEM_1, new OpenSecondActivity(), R.string.menu_item_1),
                    new ActionItem(ActionType.MENU_ITEM_2, new ShowToastAction(), R.string.menu_item_2)
                    ))
            .setActionInterceptor(this)
            .setActionFiredListener(this)
            .build();

    // Build generic bindable adapter. Just list all used item delegates
    mAdapter = new BindableAdapter<>(
            new UserDelegate(actionHandler), // you can create custom delegate
            //new ModelActionItemDelegate<BaseModel>(actionHandler, User.class, R.layout.item_user, BR.user), // or use generic
            new ModelActionItemDelegate<BaseModel>(actionHandler, Location.class, R.layout.item_location, BR.location),
            new ModelActionItemDelegate<BaseModel>(actionHandler, Advertisement.class, R.layout.item_advertisment, BR.advertisment)
    );

    // Config for RecyclerView
    mListConfig = new ListConfig.Builder(mAdapter)
            .setLayoutManagerProvider(new SimpleGridLayoutManagerProvider(mSpanCount, getSpanSizeLookup())) // if not set, LinearLayoutManager applied by default
            .addItemDecoration(new ColorDividerItemDecoration(color, spacing, SPACE_LEFT|SPACE_TOP, false))
            //.setDefaultDividerEnabled(true)
            .addOnScrollListener(new OnLoadMoreScrollListener(mCallback))
            .setItemAnimator(getCustomItemAnimator())
//            .setHasFixedSize(true)
            .setItemTouchHelper(getItemTouchHelper())
            .build(context);

    loadData();

二手图书馆：

• AdapterDelegates
• ActionHandler

启发：

https://github.com/sockeqwe/AdapterDelegates

http://hannesdorfmann.com/android/adapter-delegates

样品

示例apk文件