Android MVVM简单配置--data Binding Library

android {
  dataBinding{
        enabled=true;
    }
｝

public class User {
    public String userName;
    public String password;
}

public class UserEvent {
    private User user;
    //构造函数，将user传进来
    public UserEvent(User user) {
        this.user = user;
    }
    //对userName的监听
    public TextWatcher userNameWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }
        @Override
        public void afterTextChanged(Editable s) {
            //将改变后的值给user对象
            user.userName = s.toString();
        }
    };
    //对password的监听
    public TextWatcher passwordWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }
        @Override
        public void afterTextChanged(Editable s) {
            //将改变后的值给user对象
            user.password=s.toString();
        }
    };
}

public class MyHandler {
    private User user;
    private Activity context;
    private ProgressDialog pd;
    //构造传参
    public MyHandler(User user,Activity context,ProgressDialog pd){
        this.user=user;
        this.context=context;
        this.pd=pd;
    }
    //登录事件
    public void onClickLoginUser(View v){
        if(TextUtils.isEmpty(user.userName) || TextUtils.isEmpty(user.password)){
            showToast("用户名或密码为空");
        }else{
            pd.show();
            new Thread(new Runnable() {
                @Override
                public void run() {
                    //判断是否登录成功
                    UserLoginNet net=new UserLoginNet();
                    if(net.sendUserInfo(user)){
                        showToast("欢迎回来:"+user.userName);
                    }else{
                        showToast("用户名或密码错误");
                    }
                }
            }).start();
        }
    }
    private void showToast(final String content){
        context.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(context,content,Toast.LENGTH_SHORT).show();
                pd.dismiss();
            }
        });
    }
}

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable
            name="event"
            type="com.example.yangzhi.mvvm.UserEvent"></variable>
        <variable
            name="handler"
            type="com.example.yangzhi.mvvm.MyHandler"></variable>
    </data>
</layout>

addTextChangedListener="@{event.userNameWatcher}"

ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        //这个就不再需要
        //setContentView(R.layout.activity_main);
        user = new User();
        UserEvent event = new UserEvent(user);
        binding.setEvent(event);
        ProgressDialog pd=new ProgressDialog(this);
        MyHandler myHandler=new MyHandler(user,this,pd);
        binding.setHandler(myHandler);

public class MainActivity extends AppCompatActivity {
    private User user;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        //这个就不再需要
        //setContentView(R.layout.activity_main);
        user = new User();
        UserEvent event = new UserEvent(user);
        binding.setEvent(event);
        ProgressDialog pd=new ProgressDialog(this);
        MyHandler myHandler=new MyHandler(user,this,pd);
        binding.setHandler(myHandler);
    }
}