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

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;
}
}

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