今天来说说DataBinding在列表ListView中的使用

主要分为两种，1： 基本的实体类  2：Observable 定义字段

listView布局文件

<?xml version="1.0" encoding="utf-8"?>

<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <data>

    </data>

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="match_parent">

        <ListView

            android:id="@+id/listview_demo7"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:dividerHeight="5dp"

            android:divider="@color/colorAccent"

            ></ListView>

    </LinearLayout>

</layout>

主要看item布局

<?xml version="1.0" encoding="utf-8"?>

<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <data>

        <import type="com.zhangqie.databinding.demo7.UserBean" />

        <variable

            name="user"

            type="UserBean" />

        <import type="com.zhangqie.databinding.demo7.UserObservableBean" />

        <variable

            name="userObservableBean"

            type="UserObservableBean" />

    </data>

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="100dp"

        android:descendantFocusability="blocksDescendants"

        android:orientation="horizontal">

        <LinearLayout

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_weight="1"

            android:gravity="center"

            android:orientation="vertical">

            <TextView

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="@{`编号：` + user.userId }" />

            <TextView

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:layout_marginTop="5dp"

                android:text="@{`姓名：` +user.userName}" />

        </LinearLayout>

        <LinearLayout

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_weight="1"

            android:gravity="center"

            android:orientation="vertical">

            <TextView

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="@{`年龄：` +user.userAge}" />

            <!--表达式判断-->

            <TextView

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:layout_marginTop="5dp"

                android:text="@{`性别：` + (user.userSex == 1f ? `男` : `女`)}" />

        </LinearLayout>

        <LinearLayout

            android:layout_width="wrap_content"

            android:layout_height="match_parent"

            android:layout_marginRight="10dp"

            android:orientation="vertical">

            <Button

                android:id="@+id/btn_update"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="修改数据" />

            <Button

                android:id="@+id/btn_delete"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:layout_marginTop="5dp"

                android:text="删除数据" />

        </LinearLayout>

    </LinearLayout>

</layout>

实体类就不给了，几个字段就行

来看看adapter

public class ListViewAdapter extends BaseAdapter {

    private Context context;

    private List<UserBean> list;

    private LayoutInflater layoutInflater;

    public ListViewAdapter(List<UserBean> list, Context context) {

        this.list = list;

        this.context = context;

        this.layoutInflater = LayoutInflater.from(context);

    }

    @Override

    public int getCount() {

        return list.size();

    }

    @Override

    public Object getItem(int i) {

        return list.get(i);

    }

    @Override

    public long getItemId(int i) {

        return i;

    }

    @Override

    public View getView(int position, View convertView, ViewGroup parent) {

        Item7MvvmBinding item7MvvmBinding;

        if (convertView == null){

            //创建一个databinding

            item7MvvmBinding = DataBindingUtil.inflate(layoutInflater, R.layout.item7_mvvm,parent,false);

            //获取convertView

            convertView = item7MvvmBinding.getRoot();

        }else {

            //  //去除convertView中bangding的dataBinding

            item7MvvmBinding = DataBindingUtil.getBinding(convertView);

        }

        UserBean userBean = list.get(position);

        //绑定数据，这里的BR.user根据item布局文件中的变量声明来决定

        item7MvvmBinding.setVariable(com.zhangqie.databinding.BR.user,userBean);

        item7MvvmBinding.btnUpdate.setOnClickListener(new OnBtnClickListener(1, userBean));

        item7MvvmBinding.btnDelete.setOnClickListener(new OnBtnClickListener(2, position));

        return convertView;//也可以直接item7MvvmBinding.getRoot()也行

    }

    public class OnBtnClickListener implements View.OnClickListener{

        private int stats;//1,修改；2，删除

        private UserBean userBean;

        private int position;

        public OnBtnClickListener(int stats,UserBean userBean){

            this.stats = stats;

            this.userBean = userBean;

        }

        public OnBtnClickListener(int stats, int position) {

            this.stats = stats;

            this.position = position;

        }

        @Override

        public void onClick(View view) {

            switch (stats){

                case 1:

                    userBean.setUserName("修改后的名字");

                    Toast.makeText(context,"1",Toast.LENGTH_LONG).show();

                    notifyDataSetChanged();//刷新数据

                    break;

                case 2:

                    list.remove(position);

                    notifyDataSetChanged();

                    break;

            }

        }

    }

}

activity中

public class Demo7 extends AppCompatActivity {

    Demo7Binding demo7Binding;

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        demo7Binding = DataBindingUtil.setContentView(this, R.layout.demo7);

        initView();

    }

    private void initView(){

        ListViewAdapter listViewAdapter = new ListViewAdapter(initData(),this);

        //demo7Binding.listviewDemo7.setAdapter(listViewAdapter);

　　　　 
        //这是第二种

        ListViewObservableAdapter listViewObservableAdapter = new ListViewObservableAdapter(initObservableData(),this);

        demo7Binding.listviewDemo7.setAdapter(listViewObservableAdapter);

        listViewAdapter.notifyDataSetChanged();

    }

    //初始化测试数据

    private List<UserBean> initData() {

        List<UserBean> list = new ArrayList<>();

        for (int i = 1; i < 16; i++) {

            UserBean userBean = new UserBean();

            userBean.setUserId(i);

            userBean.setUserName("切切心语"+i);

            userBean.setUserAge(18 + i);

            userBean.setUserSex(i % 2 == 0 ? 1 : 0);

            list.add(userBean);

        }

        return list;

    }

    //初始化测试数据

    private List<UserObservableBean> initObservableData() {

        List<UserObservableBean> list = new ArrayList<>();

        for (int i = 1; i < 16; i++) {

            UserObservableBean userBean = new UserObservableBean();

            userBean.userId.set(i);

            userBean.userName.set("切切心语"+i);

            userBean.userAge.set(18 + i);

            userBean.userSex.set(i % 2 == 0 ? 1 : 0);

            list.add(userBean);

        }

        return list;

    }

}

上面adapter主要是第一种方式

第二种adapter如下：

public class ListViewObservableAdapter extends BaseAdapter {

    private Context context;

    private List<UserObservableBean> list;

    private LayoutInflater layoutInflater;

    public ListViewObservableAdapter(List<UserObservableBean> list, Context context) {

        this.list = list;

        this.context = context;

        this.layoutInflater = LayoutInflater.from(context);

    }

    @Override

    public int getCount() {

        return list.size();

    }

    @Override

    public Object getItem(int i) {

        return list.get(i);

    }

    @Override

    public long getItemId(int i) {

        return i;

    }

    @Override

    public View getView(int position, View convertView, ViewGroup parent) {

        Item7MvvmBinding item7MvvmBinding;

        if (convertView == null) {

            //创建一个databinding

            item7MvvmBinding = DataBindingUtil.inflate(layoutInflater, R.layout.item7_mvvm, parent, false);

            //获取convertView

            convertView = item7MvvmBinding.getRoot();

        } else {

            //  //去除convertView中bangding的dataBinding

            item7MvvmBinding = DataBindingUtil.getBinding(convertView);

        }

        UserObservableBean userBean = list.get(position);

        //绑定数据，这里的BR.user根据item布局文件中的变量声明来决定

        item7MvvmBinding.setVariable(com.zhangqie.databinding.BR.userObservableBean, userBean);

        item7MvvmBinding.btnUpdate.setOnClickListener(new OnBtnClickListener(1, userBean));

        item7MvvmBinding.btnDelete.setOnClickListener(new OnBtnClickListener(2, position));

        return convertView;//也可以直接item7MvvmBinding.getRoot()也行

    }

    public class OnBtnClickListener implements View.OnClickListener {

        private int stats;//1,修改；2，删除

        private UserObservableBean userBean;

        private int position;

        public OnBtnClickListener(int stats, UserObservableBean userBean) {

            this.stats = stats;

            this.userBean = userBean;

        }

        public OnBtnClickListener(int stats, int position) {

            this.stats = stats;

            this.position = position;

        }

        @Override

        public void onClick(View view) {

            switch (stats) {

                case 1:

                    userBean.userName.set("修改后的名字");//自动更新数据

                    break;

                case 2:

                    list.remove(position);

                    notifyDataSetChanged();

                    break;

            }

        }

    }

}

把前面讲的Observable 结合到ListView中来简单应用一些

效果如图：

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