AB_PojoViewModel

PojoViewModel 这里先mark下，简要说下概念。

概要：实验性的，尝试 pojo风格的ViewModel。该子类无需 Observables 和 Commands。只要声明自己的 绑定接口就好。（实现PojoViewModel接口即可）

 public interface PojoViewModel {
        PojoViewModelHelper getHelper();
        void notifyPropertyChanged(String propertyName);
    }

 it is only working in flat view models (i.e. Array, Cursor are not supported)

目前仅适用于1维数据模型操作。比如数组，游标之类的 是不支持的。

具体应用_ 简单来说，就是属性映射为pojo对应的 字段属性。方法映射为pojo定义的方法。

Demo:(登陆操作)

public class SamplPojoViewModel implements PojoViewModel {
        private PojoViewModelHelper mHelper = new PojoViewModelHelper();
        public PojoViewModelHelper getHelper() {
                return mHelper;
        }

        public void notifyPropertyChanged(String propertyName) {
                mHelper.notifyPropertyChanged(propertyName);
        }
        // rest of the class declarations
    }

View Model :

 public class LoginViewModel implements PojoViewModel {
        private PojoViewModelHelper mHelper = new PojoViewModelHelper();
        public PojoViewModelHelper getHelper() {
                return mHelper;
        }

        public void notifyPropertyChanged(String propertyName) {
                mHelper.notifyPropertyChanged(propertyName);
        }

        // View Model Public contracts
        public String getLoginName() { return loginName; }
        public String getPassword() { return password; }
        // setters
        public void setLoginName(String loginName){
            this.loginName = loginName;
            notifyPropertyChanged("LoginName");
        }

        public void setPassword(String password){
            this.password = password;
            notifyPropertyChanged("Password");
        }
        
        public void Submit(){ ... }
        
        // Private fields
        private String loginName;
        private String password;
        // ... rest of the stuffs
    }

 在Activity中 进行Binding时 需要对POJOViewModel进行 一层封装，因为Binder无法直接识别 PojoViewModel

 PojoViewModelWrapper<?> wrapper = PojoViewModelWrapper.create(new SamplePojoViewModel());
 Binder.setAndBindContentView(this, R.layout.main, wrapper);

对应Xml:

<TextView android:...
     binding:text="LoginName"/>
    <TextView android:...
     binding:text="Password"/>
    <Button android:...
     binding:onClick="Submit"/>