android -------- Data Binding的使用 ( 四 )ListView
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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