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");
}
}
