android MVVM开发框架——（3）DataBinding 应用于RecyclerView

android MVVM开发框架——（1）DataBinding 基础应用

android MVVM开发框架——（2）DataBinding 应用于ListView

如果你对mvvm或者databinding不太熟悉的，建议先去看看前两篇博文

1，item布局沿用上一篇listview的布局，这里就不贴出来了

2，recyclervice布局

<?xml version="1.0" encoding="utf-8"?><layout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto">    <data>        <import type="com.lh.mvvm.adapter.RecyclerViewAdapter" />        <variable            name="adapter"            type="RecyclerViewAdapter" />        <!--这里可以让modle可以控制recyclerview的背景色-->        <variable            name="image"            type="int" />    </data>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="match_parent"        android:orientation="vertical">        <android.support.v7.widget.RecyclerView            android:id="@+id/recycler_test"            android:layout_width="match_parent"            android:layout_height="0dp"            android:layout_weight="0.1"            android:background="@{image}"            app:adapter="@{adapter}" />    </LinearLayout></layout>

3，RecyclerViewHolder

public class RecyclerViewHolder extends RecyclerView.ViewHolder {    //这里只要给RecyclerView.ViewHolder返回一个view就可以，所以我们将构造方法中传入databinding    ItemMvvmBinding itemMvvmBinding;    public RecyclerViewHolder(ItemMvvmBinding itemMvvmBinding) {        super(itemMvvmBinding.getRoot());        this.itemMvvmBinding = itemMvvmBinding;    }    public ItemMvvmBinding getBinding() {        return itemMvvmBinding;    }    public void setBinding(ItemMvvmBinding itemMvvmBinding) {        this.itemMvvmBinding = itemMvvmBinding;    }}

4,RecyclerViewAdapter

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolder> implements View.OnClickListener {    private List<UserBean> data;    /**     * 用于模仿listview的itemclick事件，recyclerview没有itemclick     */    private OnItemClickListener mOnItemClickListener;    public interface OnItemClickListener {        void onItemClick(View view, int position);    }    public void setOnItemClickListener(OnItemClickListener listener) {        this.mOnItemClickListener = listener;    }    public RecyclerViewAdapter(List<UserBean> data) {        this.data = data;    }    @Override    public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        ItemMvvmBinding itemMvvmBinding = DataBindingUtil.inflate(LayoutInflater.from(parent.getContext()), R.layout.item_mvvm, parent, false);        itemMvvmBinding.getRoot().setOnClickListener(this);        return new RecyclerViewHolder(itemMvvmBinding);    }    @Override    public void onBindViewHolder(RecyclerViewHolder holder, int position) {        ItemMvvmBinding itemMvvmBinding = holder.getBinding();        UserBean userBean = data.get(position);        itemMvvmBinding.setUser(userBean);        //将position保存在itemView的Tag中，以便点击时进行获取        itemMvvmBinding.getRoot().setTag(position);        itemMvvmBinding.btnUpdate.setOnClickListener(new OnBtnClickListener(1, userBean));        itemMvvmBinding.btnDelete.setOnClickListener(new OnBtnClickListener(2, position));        // 立刻执行绑定        itemMvvmBinding.executePendingBindings();    }    private class OnBtnClickListener implements View.OnClickListener {        private int stats;//1,修改；2，删除        private UserBean userBean;        private int position;        OnBtnClickListener(int stats, UserBean userBean) {            this.stats = stats;            this.userBean = userBean;        }        OnBtnClickListener(int stats, int position) {            this.stats = stats;            this.position = position;        }        @Override        public void onClick(View v) {            switch (stats) {                case 1:                    userBean.userName.set("修改后的名字");                    break;                case 2:                    data.remove(position);                    notifyDataSetChanged();                    break;            }        }    }    @Override    public int getItemCount() {        return data == null ? 0 : data.size();    }    @Override    public void onClick(View v) {        if (mOnItemClickListener != null)            mOnItemClickListener.onItemClick(v, (int) v.getTag());    }}

5,RecyclerViewActivity

public class RecyclerViewActivity extends Activity {    ActivityRecyclerViewBinding recyclerViewBinding;    ArrayList<UserBean> data;    @Override    public void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        recyclerViewBinding = DataBindingUtil.setContentView(this, R.layout.activity_recycler_view);        data = initData();        //需要设置recyclerview的layoutmanager，不然视图无法显示        //第二个参数表示水平布局，第三个参数表示是否反转,视图从下往上滑        //new GridLayoutManager(this,3,GridLayoutManager.HORIZONTAL,false)); //表格布局        //new LinearLayoutManager(recyclerView.getContext(), LinearLayoutManager.VERTICAL, true));        //new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));//瀑布流        recyclerViewBinding.recyclerTest.setLayoutManager(new LinearLayoutManager(this, GridLayoutManager.VERTICAL, false));        //初始化适配器        RecyclerViewAdapter recyclerViewAdapter = new RecyclerViewAdapter(data);        //绑定适配器        recyclerViewBinding.setAdapter(recyclerViewAdapter);        //item的点击事件        recyclerViewAdapter.setOnItemClickListener(new RecyclerViewAdapter.OnItemClickListener() {            @Override            public void onItemClick(View view, int position) {                Toast.makeText(RecyclerViewActivity.this, "行数：" + position, Toast.LENGTH_LONG).show();            }        });        //通过属性设置view的背景色        recyclerViewBinding.setImage(getResources().getColor(R.color.colorAccent));    }    //初始化测试数据    private ArrayList<UserBean> initData() {        ArrayList<UserBean> list = new ArrayList<>();        for (int i = 0; i < 1000; i++) {            UserBean userBean = new UserBean();            userBean.userId.set(i);            userBean.userName.set(i + "aaa");            userBean.userAge.set(18 + i);            userBean.userSex.set(i % 2 == 0 ? 1 : 0);            list.add(userBean);        }        return list;    }}

recyclerview与databinding之间的绑定就是这样

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