DataBinding部分踩坑

以下是databinding使用的一个小demo, 自己练习用的, 目前觉得不好用, 暂时就先放弃了, 但是记录在简书上, 记录一些自己踩过的坑
添加依赖:
android {
.......
//在这里设置是说此项目支持databinding
dataBinding {
enabled = true
}
}

xml(看到简书这样的排版我也是醉了):
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">

<data class=".Custom">
    <import type="java.util.HashMap"/>
    <import type="java.util.ArrayList"/>
    <import type="android.graphics.Bitmap"/>
    <import type="com.diandou.demo5_databinding.Student" alias="tudent"/>

    <import type="com.diandou.demo5_databinding.EventHandlers"></import>

    <variable
        name="handlers"
        type="EventHandlers"/>
    
    <variable
        name="stu"
        type="tudent" />

    <variable
        name="str"
        type="String"/>
    <variable
        name="error"
        type="boolean"/>
    <variable
        name="num"
        type="int"/>
    <variable
        name="map"
        type="HashMap<String, String>" />

    <variable
        name="list"
        type="ArrayList<String>" />

    <variable
        name="click"
        type="com.diandou.demo5_databinding.MainActivity"/>

    <variable
        name="people"
        type="com.diandou.demo5_databinding.People"/>
</data>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{stu.name}" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{stu.addr}" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{str}" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{String.valueOf(num)}" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="----------" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{list[num]}" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{map[str]}" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text='@{error ? "ok" : "error"}' />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Click me"
        android:onClick="@{handlers.handleClick}"
        />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="@{click.click}"
        android:text="@{stu.name}"
        />

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{people.name}"
            />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@{String.valueOf(people.age)}"
            />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text='@{people.isMan ? "man":"women"}'
            />
    </LinearLayout>
</LinearLayout>

</layout>

实体类:

import android.databinding.BaseObservable;
import android.databinding.Bindable;

/**

• Created by baiya on 2017/3/30.
  */

public class Student extends BaseObservable{

private String name;
private String addr;

public Student() {
}

public Student(String name, String addr) {
    this.name = name;
    this.addr = addr;
}

@Bindable
public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
    notifyPropertyChanged(BR.name);
}

@Bindable
public String getAddr() {
    return addr;
}

public void setAddr(String addr) {
    this.addr = addr;
    notifyPropertyChanged(BR.addr);
}

}

另一个bean类
import android.databinding.ObservableBoolean;
import android.databinding.ObservableField;
import android.databinding.ObservableInt;

/**

• Created by baiya on 2017/3/31.
  */

public class People {
public ObservableField<String> name = new ObservableField<>();
public ObservableInt age = new ObservableInt();
public ObservableBoolean isMan = new ObservableBoolean();
}

相应点击事件的类
package com.diandou.demo5_databinding;

import android.view.View;
import android.widget.Toast;

/**

• Created by baiya on 2017/3/31.
  */

public class EventHandlers {
public void handleClick(View view) {
Toast.makeText(view.getContext(), "you clicked the view", Toast.LENGTH_LONG).show();
}
}

main:

import android.databinding.DataBindingUtil;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

import com.diandou.demo5_databinding.Custom;

import java.util.ArrayList;
import java.util.HashMap;

public class MainActivity extends AppCompatActivity {

private Student student;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Custom binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
    student = new Student("loader", "山东");
    binding.setStu(student);
    binding.setStr("lallalla");
    binding.setNum(1);
    binding.setError(true);
    ArrayList<String> strings = new ArrayList<>();
    strings.add("lal");
    strings.add("lal---");
    binding.setStr("lallalla");
    binding.setList(strings);
    HashMap<String, String> stringStringHashMap = new HashMap<>();
    stringStringHashMap.put("lallalla","909090");
    binding.setMap(stringStringHashMap);
    binding.setHandlers(new EventHandlers());
    binding.setClick(this);
    People mPeople = new People();
    binding.setPeople(mPeople);
    mPeople.name.set("people");
    mPeople.age.set(19);
    mPeople.isMan.set(true);

}

public void click(View view) {
    student.setName("qin");
}

}