DataBinding

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

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

    <data>

        <variable name="user" type="com.example.cunli.databing.web.User"/>

    </data>

    <LinearLayout

        android:orientation="vertical"

        android:layout_width="match_parent"

        android:layout_height="match_parent">

        <EditText android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@={user.email}"

            android:id="@+id/email"

            />

        <TextView android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="@={user.password}"

            android:id="@+id/password"

            android:layout_marginTop="10dp"/>

        <Button

            android:layout_marginTop="30dp"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:id="@+id/btn"

            android:onClick="hello"

            android:text="@string/app_name"/>

    </LinearLayout>

 </layout>

 package com.example.cunli.databing.web;

 import android.databinding.BaseObservable;

 import android.databinding.Bindable;

 import com.example.cunli.databing.BR;

 /**

 * Created by winder on 2016/7/6.

 */

 public class User extends BaseObservable {

    public  String email;

    public  String password;

    public User() {

    }

    public User(String email, String password) {

        this.email = email;

        this.password = password;

    }

    @Bindable

    public String getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

        notifyPropertyChanged(BR.password);

    }

    @Bindable

    public String getEmail() {

        return email;

    }

    public void setEmail(String email) {

        this.email = email;

        notifyPropertyChanged(BR.email);

    }

 }

 package com.example.cunli.databing.activity;

 import android.databinding.DataBindingUtil;

 import android.os.Bundle;

 import android.support.v7.app.AppCompatActivity;

 import android.util.Log;

 import android.view.View;

 import android.widget.Toast;

 import com.example.cunli.databing.R;

 import com.example.cunli.databing.databinding.ActivityMainBinding;

 import com.example.cunli.databing.server.TeachLogServer;

 import com.example.cunli.databing.web.CheckTeachLog;

 import com.example.cunli.databing.web.TeachLog;

 import com.example.cunli.databing.web.User;

 public class MainActivity extends AppCompatActivity {

    private TeachLogServer teachLogServer = new TeachLogServer();

    User user;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);

        user = new User("haliluya", "thankyoulord");

        binding.setUser(user);

    }

    public void hello(View view){

        Log.e("password","------getEmail------- "+user.getEmail());

        Toast.makeText(this,user.getEmail()+"\t"+user.getPassword(), Toast.LENGTH_SHORT).show();

    }

 }