一.公用的實體類工具類
Animal.java
package com.example.administrator.databindtext12225;
import android.databinding.ObservableField;
import android.databinding.ObservableInt;
public class Animal {
public final ObservableField<String> field = new ObservableField<>();
public final ObservableInt age = new ObservableInt();
}
user.java
package com.example.administrator.databindtext12225;
import android.databinding.BaseObservable;
import android.databinding.Bindable;
/**
* Created by Administrator on 2016/12/25 0025.
*/
public class User extends BaseObservable{
private String name;
private String address;
private int age;
@Bindable
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
//和bindable配對使用
// notifyPropertyChanged(com.example.administrator.databindtext.BR.name);
notifyPropertyChanged(com.example.administrator.databindtext12225.BR.name);
}
@Bindable
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
notifyPropertyChanged(com.example.administrator.databindtext12225.BR.address);
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
other/user.java
package com.example.administrator.databindtext12225.other;
import android.databinding.BaseObservable;
/**
* Created by Administrator on 2016/12/25 0025.
*/
public class User extends BaseObservable{
private String daxiongName;
private String daxiongAddress;
private int daxiongAge;
public String getDaxiongName() {
return daxiongName;
}
public void setDaxiongName(String daxiongName) {
this.daxiongName = daxiongName;
}
public String getDaxiongAddress() {
return daxiongAddress;
}
public void setDaxiongAddress(String daxiongAddress) {
this.daxiongAddress = daxiongAddress;
}
public int getDaxiongAge() {
return daxiongAge;
}
public void setDaxiongAge(int daxiongAge) {
this.daxiongAge = daxiongAge;
}
}
//student.java
import android.databinding.BaseObservable;
import android.databinding.ObservableBoolean;
import android.databinding.ObservableField;
/**
* Created by Administrator on 2016/12/25 0025.
*/
public class Student extends BaseObservable{
public ObservableField<String> stuName = new ObservableField<>();
public ObservableBoolean isMan = new ObservableBoolean();
private String stuAge;
public String getStuAge() {
return stuAge;
}
public void setStuAge(String stuAge) {
this.stuAge = stuAge;
}
}
MyAdapter.java
package com.example.administrator.databindtext12225;
import android.databinding.DataBindingUtil;
import android.databinding.ViewDataBinding;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
/**
* Created by Administrator on 2016/12/25 0025.
*/
public class MyAdapter extends RecyclerView.Adapter {
private ArrayList<Student> mData = new ArrayList<>();
public MyAdapter(ArrayList<Student> data) {
mData.addAll(data);
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
ViewDataBinding binding = DataBindingUtil.inflate(LayoutInflater
.from(parent.getContext()), R.layout.item_recycleview, parent, false);
ViewHolder holder = new ViewHolder(binding.getRoot());
holder.setBinding(binding);
return holder;
}
/**
* ViewDataBinding是我們之前用的那些binding的父類,隻有自動生成的那些子類才會有setXXX方法,那現在我們需要在ViewDataBinding中設定變量咋辦?這個類為我們提供了setVariable去設定變量,第一個參數是我們的變量名的引用,第二個是我們要設定的值
*當資料改變時,binding會在下一幀去改變資料,如果我們需要立即改變,就去調用executePendingBindings方法
* */
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
((ViewHolder)holder).getBinding().setVariable(com.example.administrator.databindtext12225.BR.stu,mData.get(position));
((ViewHolder)holder).getBinding().executePendingBindings();
((ViewHolder)holder).getBinding().setVariable(com.example.administrator.databindtext12225.BR.drawableId,R.mipmap.ic_launcher);
}
@Override
public int getItemCount() {
return mData.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
private ViewDataBinding binding;
public ViewHolder(View itemView) {
super(itemView);
}
public void setBinding(ViewDataBinding binding) {
this.binding = binding;
}
public ViewDataBinding getBinding() {
return this.binding;
}
}
}
Utill.java
package com.example.administrator.databindtext12225;
import android.databinding.BindingAdapter;
import android.widget.ImageView;
/**
* Created by Administrator on 2016/12/25 0025.
*/
public class Utils {
@BindingAdapter({"bind:image"})
public static void imageLoader(ImageView imageView, int drawableId) {
imageView.setBackgroundResource(drawableId);
}
}
二.Mainactivity.java
/**
* 這裡主要寫的是怎麼把
* 1.對象 和 基本資料類型 跟view綁定
* 2.給include的布局 傳遞對象
* [email protected]{user.displayName ?? user.lastName 如果不是null 就是自身,如果是null就是user.lastName
* 4.
* <TextView android:layout_width="wrap_content"
* android:layout_height="wrap_content"
* android:text="@{user.firstName, default=超哥}"/>
* 5.如何 import 相同類名的class
*/
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private User mUser;
private com.example.administrator.databindtext12225.other.User mOtherUser;
private ActivityMainBinding mBinding;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main);
mUser = new User();
mUser.setName("超哥");
mUser.setAddress("北一峰");
mOtherUser = new com.example.administrator.databindtext12225.other.User();
mOtherUser.setDaxiongName("我是大雄");
mOtherUser.setDaxiongAddress("南一峰");
mBinding.setUser(mUser);
mBinding.setOtheruser(mOtherUser);
//editText 輸入完成改變對象
mBinding.btOtherUserConfirm.setOnClickListener(this);
mBinding.btUserConfirm.setOnClickListener(this);
//跳轉到SecondActivity
mBinding.btJump.setOnClickListener(this);
}
@Override
public void onClick(View view) {
if (view == mBinding.btUserConfirm) {
System.out.println("xcqw btUserConfirm name" + mBinding.etUserName.getText().toString() + " address " + mBinding.etUserAddress.getText().toString());
// 方法1: 這種不會立即改變View (user沒有繼承baseObservale)
// mUser.setName(mBinding.etUserName.getText().toString());
// mUser.setAddress(mBinding.etUserAddress.getText().toString());
// 方法2: 這種就會立即改變View(也就是重新設定一個user)
// User user = new User();
// user.setName(mBinding.etUserName.getText().toString());
// user.setAddress(mBinding.etUserAddress.getText().toString());
// mBinding.setUser(user);
// 方法3: 會立即改變View
// 1.user extends baseobservable
// 2.在get方法上@bindable
// 3.在set方法notifyPropertyChanged
mUser.setName(mBinding.etUserName.getText().toString());
mUser.setAddress(mBinding.etUserAddress.getText().toString());
} else if (view == mBinding.btOtherUserConfirm) {
// 方法1: 這種不會立即改變View
// System.out.println("xcqw btOtherUserConfirm name"+mBinding.etOtherUserName.getText().toString()+" address "+mBinding.etOtherUserAddress.getText().toString());
// mOtherUser.setDaxiongName(mBinding.etOtherUserName.getText().toString());
// mOtherUser.setDaxiongAddress(mBinding.etOtherUserAddress.getText().toString());
// 方法2: 這種就會立即改變View
com.example.administrator.databindtext12225.other.User user = new com.example.administrator.databindtext12225.other.User();
user.setDaxiongName(mBinding.etOtherUserName.getText().toString());
user.setDaxiongAddress(mBinding.etOtherUserAddress.getText().toString());
mBinding.setOtheruser(user);
} else if (view == mBinding.btJump) {
startActivity(new Intent(MainActivity.this, SecondActivity.class));
}
}
}
Activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:bind="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="user"
type="com.example.administrator.databindtext12225.User">
</variable>
<!--因為type="User"都為User類,會導緻不知道到那個包,是以可以通過alias屬性重命名type的類型-->
<import
alias="Other"
type="com.example.administrator.databindtext12225.other.User"/>
<variable
name="otheruser"
type="Other">
</variable>
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
layout="@layout/include_layout"
bind:user="@{user}"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:context="com.example.administrator.databindtext12225.MainActivity">
<TextView
android:id="@+id/tv_user_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{`userName`+user.name}"/>
<TextView
android:id="@+id/tv_user_address"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{`userAddress`+user.address}"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:context="com.example.administrator.databindtext12225.MainActivity">
<TextView
android:id="@+id/tv_other_user_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{`otherUserName`+otheruser.daxiongName}"/>
<TextView
android:id="@+id/tv_other_user_address"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{`otherUserAddress`+otheruser.daxiongAddress}"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<EditText
android:id="@+id/et_user_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="請輸入user的name"/>
<EditText
android:id="@+id/et_user_address"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="請輸入user的address"/>
<Button
android:id="@+id/bt_user_confirm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="确認輸入,改變userView"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<EditText
android:id="@+id/et_other_user_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="請輸入otheruser的name"/>
<EditText
android:id="@+id/et_other_user_address"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="請輸入otheruser的address"/>
<Button
android:id="@+id/bt_other_user_confirm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="确認輸入,改變otherUserView"/>
</LinearLayout>
<Button
android:id="@+id/bt_jump"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="跳到SecondActivity"/>
</LinearLayout>
</layout>
三.SecondActivity.java
**
* 1.一些特殊字元的轉義,<String> 左右尖括号的寫法
* 2.對象綁定的另外一種方法 屬性都用observal
* 3.arrayList,map綁定的方法
* 4.map的兩種寫法
* normalMap.get(`age`)
* map[`name`]
* 5.在布局檔案中可以用``拼接字元串
* */
public class SecondActivity extends AppCompatActivity {
private ActivitySecondBinding mBinding;
private ObservableArrayList<com.example.administrator.databindtext12225.other.User> arrayList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mBinding = DataBindingUtil.setContentView(SecondActivity.this, R.layout.activity_second);
//第一部分 普通的寫法不會直接互相綁定
// final ArrayList<String> normalList = new ArrayList<>();
// normalList.add("first");
// normalList.add("second");
// mBinding.setNormalList(normalList);
//
// final Map<String, String> normalMap = new HashMap<>();
// normalMap.put("name", "zhangsan");
// normalMap.put("age", "40");
// mBinding.setNormalMap(normalMap);
//
// final String[] normalArrays = {"lisi", "laowang"};
// mBinding.setNormalArrays(normalArrays);
//第二部分 這麼寫才會互相綁定
final Animal animal = new Animal();
animal.field.set("cat");
animal.age.set(2);
mBinding.setAnimal(animal);
arrayList = new ObservableArrayList<>();
for (int i=0;i<2;i++){
com.example.administrator.databindtext12225.other.User user = new com.example.administrator.databindtext12225.other.User();
user.setDaxiongName("大熊"+i+"号");
arrayList.add(user);
}
mBinding.setUserList(arrayList);
final ObservableArrayList<String> list = new ObservableArrayList<>();
list.add("daxiong");
list.add("daxiong2");
mBinding.setList(list);
final ObservableArrayMap<String, String> map = new ObservableArrayMap<>();
map.put("name","Tom");
map.put("age","4");
mBinding.setMap(map);
mBinding.btChangeValue.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// 第一部分 這麼寫不會互相綁定
// normalList.set(0,"hehe");
// normalList.set(1,"haha");
// normalMap.put("name","sam");
// normalMap.put("age","5");
// normalArrays[0] = "zhaosi";
//第二部分
//作用類型 對象的bindable
animal.field.set("dog");
animal.age.set(4);
list.set(0,"cat");
list.set(1,"dog");
map.put("name","Sam");
map.put("age","5");
//other/user中的屬性需要加上 notifyPropertyChanged(BR.daxiongName); 才會生效,否則沒用
arrayList.get(0).setDaxiongName("大熊一号改裝過");
arrayList.get(1).setDaxiongName("大熊二号改裝過");
}
});
mBinding.btJumpThirdactivity.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(SecondActivity.this,ThirdActivity.class));
}
});
}
}
Activity_second.xml
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.administrator.databindtext12225.SecondActivity">
<data>
<import type="java.util.ArrayList" />
<import type="java.util.Map" />
<import type="java.lang.String" />
<import type="com.example.administrator.databindtext12225.other.User" />
<variable
name="secondActivity"
type="com.example.administrator.databindtext12225.SecondActivity">
</variable>
<!--第一部分-->
<variable
name="normalList"
type="ArrayList<String>"/>
<!--泛型的支援會在編譯時期報紅線,但是是可以直接運作的
但是需要通過轉義字元才行,如:<資料類型> 或者<資料類型>-->
<!--< < > > 貌似這個gt可以直接用> 但是<必須被替換-->
<variable
name="normalMap"
type="Map<String,String>" />
<variable
name="normalArrays"
type="String[]" />
<!--第一部分結束-->
<!--這麼寫一直報錯,非要寫的跟下面一樣,把user拿出去!!!!-->
<!--<variable-->
<!--name="user"-->
<!--type="com.example.administrator.databindtext12225.User">-->
<!--</variable>-->
<variable
name="user"
type="User">
</variable>
<variable
name="animal"
type="com.example.administrator.databindtext12225.Animal">
</variable>
<variable
name="userList"
type="android.databinding.ObservableArrayList<User>"/>
<variable
name="list"
type="android.databinding.ObservableArrayList<String>"/>
<variable
name="map"
type="android.databinding.ObservableArrayMap<String,String>"/>
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<!--第一部分-->
<!--<TextView-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content"-->
<!--android:text="@{normalList[0]}"/>-->
<!--<TextView-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content"-->
<!--android:text="@{normalList[1]}"/>-->
<!--<!–!!!!! `````這個符号可以憑借字元串–>-->
<!--<TextView-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content"-->
<!--android:text="@{normalMap.get(`age`)}"/>-->
<!--<TextView-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content"-->
<!--android:text="@{normalArrays[0]}"/>-->
<!--第一部分結束-->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{`animal.filed`+animal.field}" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{`animal.age`+String.valueOf(animal.age)}" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{`list[0]`+list[0]}" />
<!--Map集合既可以通過map[key]的方式,也可以通過調用API-->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{`list[1]`+list[1]}" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{`map[name]`+map[`name`]}" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{`otheruserList[0]name`+userList[0].getDaxiongName}" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{`otheruserList[1]name`+userList[1].getDaxiongName}" />
<Button
android:id="@+id/bt_change_value"
android:layout_width="wrap_content"
android:text="改變資料"
android:layout_height="wrap_content" />
<Button
android:id="@+id/bt_jump_thirdactivity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="跳到ThirdActivity"/>
</LinearLayout>
</layout>
四.ThirdActivity.java
/**
* 1.點選事件的幾種寫法
* */
public class ThirdActivity extends AppCompatActivity {
private ActivityThirdBinding mBinding;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mBinding = DataBindingUtil.setContentView(ThirdActivity.this, R.layout.activity_third);
User user = new User();
user.setName("我是第三個Activity");
mBinding.setUser(user);
// 第二種點選事件寫法
mBinding.setClickEvent(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(ThirdActivity.this, "xcqw 我是第二種點選事件寫法", Toast.LENGTH_SHORT).show();
}
});
// 第三種點選事件寫法
mBinding.setMyEvent(new MyEventListener() {
@Override
public void clickEventOne(View view) {
Toast.makeText(ThirdActivity.this, "xcqw 我是第三種寫法 clickEventOne", Toast.LENGTH_SHORT).show();
}
@Override
public void clickEventTwo(View view) {
Toast.makeText(ThirdActivity.this, "xcqw 我是第三種寫法 clickEventTwo", Toast.LENGTH_SHORT).show();
}
@Override
public void clickEventThree(User user) {
Toast.makeText(ThirdActivity.this, "xcqw 我是第三種寫法 clickEventTwo username"+user.getName(), Toast.LENGTH_SHORT).show();
}
});
mBinding.btJumpFouractivity.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(ThirdActivity.this,FourActivity.class));
}
});
}
public void firstMethodClick(View view){
// 這種傳統的點選事件寫法還有好幾種
Toast.makeText(ThirdActivity.this, "xcqw 我是第一種寫法 firstMethodClick", Toast.LENGTH_SHORT).show();
}
}
Activity_third.java
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.administrator.databindtext12225.SecondActivity">
<data>
<variable
name="view"
type="android.view.View">
</variable>
<variable
name="user"
type="com.example.administrator.databindtext12225.User"/>
<variable
name="clickEvent"
type="android.view.View.OnClickListener"
/>
<variable
name="myEvent"
type="com.example.administrator.databindtext12225.MyEventListener"/>
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<Button
android:id="@+id/bt_first_method"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="firstMethodClick"
android:text="第一種傳統寫法"/>
<Button
android:id="@+id/bt_second_method"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="@{clickEvent}"
android:text="第二種點選方式"/>
<Button
android:id="@+id/bt_third_method"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="@{myEvent.clickEventOne}"
android:text="第三種新式寫法"/>
<!--不知道() -> myEvent.clickEventThree(user) 代表什麼意思-->
<Button
android:id="@+id/bt_third_method_two"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="@{() -> myEvent.clickEventThree(user)}"
android:text="第三種新式寫法有入參"/>
<Button
android:id="@+id/bt_jump_fouractivity"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="跳到fourActivity"/>
</LinearLayout>
</layout>
五.FourActivitiy.java
package com.example.administrator.databindtext12225;
import android.databinding.DataBindingUtil;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.view.View;
import com.example.administrator.databindtext12225.databinding.ActivityFourBinding;
import java.util.ArrayList;
/**
* 1.recycleView
* 2.自定義binding de set方法
* (1)現在utils方法寫一個@BindingAdapter({"bind:image"})
public static void imageLoader(ImageView imageView, int drawableId) {
imageView.setBackgroundResource(drawableId);
(2)然後在布局裡面用上
<variable
name="drawableId"
type="int" />
<ImageView
android:id="@+id/img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:image="@{drawableId}"/>
(3)實際用的地方
((ViewHolder)holder).getBinding().setVariable(com.example.administrator.databindtext12225.BR.drawableId,R.mipmap.ic_launcher);
// @BindingAdapter({"bind:imageUrl", "bind:error"})
// public static void loadImage(ImageView view, String url, Drawable error) {
// Picasso.with(view.getContext()).load(url).error(error).into(view);
// }
* */
public class FourActivity extends AppCompatActivity {
private ActivityFourBinding mBinging;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_four);
mBinging = DataBindingUtil.setContentView(FourActivity.this, R.layout.activity_four);
mBinging.recycle.setLayoutManager(new LinearLayoutManager(this,
LinearLayoutManager.VERTICAL, false));
final ArrayList<Student> mData = new ArrayList<>();
for (int i = 0;i<10;i++){
Student stu = new Student();
stu.stuName.set("我是學生 "+i);
mData.add(stu);
}
mBinging.recycle.setAdapter(new MyAdapter(mData));
mBinging.btChangeData.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mData.get(4).stuName.set("hahahhahaha");
//普通寫法是沒用
//1 stu 中寫bindable
//2 把String 寫成 observableField<String>
}
});
}
}
Activity_four.xml
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.administrator.databindtext12225.FourActivity">
<data>
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycle"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
<Button
android:id="@+id/bt_change_data"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="點我改變資料"/>
</LinearLayout>
</layout>
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