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When you really learn databinding, you will find "this thing is really fragrant"!
2022-07-01 13:34:00 【InfoQ】
Preface
DataBinding It's just a tool , Used to solve View And data .
Data Binding, seeing the name of a thing one thinks of its function ： Data binding , It can bind the components in the layout page with the data in the application , Support one-way binding and two-way binding , One way binding is to drive the page to change if the data changes , Two way binding means that in addition to one-way binding, it also supports page changes to drive data changes , If there is an input box in the page , Then we can bind in both directions , Data changes , Its display changes , We can also change the data bound to it by manually entering the content .
Official documents ：
https://developer.android.google.cn/jetpack/androidx/releases/databinding
official Demo Address ：
https://github.com/googlecodelabs/android-databinding
This article code address
How to use DataBinding Well ？
1. Enable DataBinding
Quote official documents ：
Databinding And
Android Gradle plug-in unit
Tied together . You do not need to declare dependencies on this library , But it must be enabled .
Be careful
： Even if the module does not use data binding directly , You must also enable data binding for all modules that depend on libraries that use data binding .
// stay gradle Of android Lower join , And then click sync
android {
...
//android studio 4.0 following
dataBinding{
}
//android studio4.1 in the future
buildFeatures {
dataBinding true
}
}
2. Generate DataBinding Layout
In our layout file , Select the root View, Press down Alt+ Enter key , Click on
Convert to data binding layout, It can be converted into
DataBinding Layout .
Then our layout will become like this ：
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
We can find out , The outermost part becomes
layout Elements , There are
data Elements . We will be in
data Element to declare the variables used in this layout , And the type of the variable .
for instance ：
<data>
<import type="com.example...."/>
<variable
name="color"
type="java.lang.String" />
</data>
- data：Declare and import variables in the tag
- variable：Declare variables
- import：Import the required classes
3. Make a statement User Entity class
class User() {
var name = "Taxze"
var age = 18
fun testOnclick() {
Log.d("onclick", "test")
}
}
4. stay xml Use in
And then in data Declare variables in , And the class name
<data>
<!-- <variable-->
<!-- name="user"-->
<!-- type="com.taxze.jetpack.databinding.User" />-->
<import type="com.taxze.jetpack.databinding.User" />
<variable
name="user"
type="User" />
</data>
Then use... In the layout
@{} grammar
// Pseudo code , Do not directly CV
<TextView
...
android:text="@{user.name}"
/>
5. stay Activity or Fragment Use in DataBinding
stay Activity Pass through
DataBindingUtil Set up layout file , At the same time, omit
Activity Of setContentView Method
class MainActivity : AppCompatActivity() {
private lateinit var mainBinding: ActivityMainBinding
private lateinit var mainUser: User
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
mainBinding = DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main)
mainUser = User()
mainBinding.user = mainUser
}
}
stay Fragment Use in ：
class BlankFragment : Fragment() {
private lateinit var mainFragmentBinding:FragmentBlankBinding
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
mainFragmentBinding = DataBindingUtil.inflate(inflater,R.layout.fragment_blank,container,false)
return mainFragmentBinding.root
}
}
The system will generate a binding class for each layout file . By default , The name of the class is the name of the layout file converted to Pascal Case , Then add... At the end
Binding suffix , for example ： The name is
activity_main Layout file for , The corresponding class name is
ActivityMainBinding Effect after running ：
Be careful ： Only when the layout file is converted to
layout After the pattern ,
databinding Will automatically generate a corresponding
binding class , You can also be in
build/generated/data_binding_base_source_out View the generated class under the directory
The most basic use is like this , Next, let's talk about how to better use DataBinding
How to be in xml Better use in layout DataBinding
1. Use the elements in the collection
- Join us and pass in a collection
books, We can use it in the following ways ：
- Get the value of the collection
- Add default （ The default value does not need to be quoted , And only in the preview view ）
- ```xml
android:text="@{books.pages,default=330}"
- adopt ?? or ?: To achieve
- ```xml
android:text="@{books.pages != null ? book.pages : book.defaultPages}"
- ```xml
android:text="@{books.pages ?? book.defaultPages}"
2. Use map Data in
mapThe structure of type can also be through get and [] There are two ways to get
**3. Convert data type **
- because `DataBinding` No automatic type conversion , So we need to switch manually , For example, in text Use in label String.valueOf() Convert to String type , stay rating We can use Float.valueOf() convert
- ```xml
android:text="@{String.valueOf(book.pages)}"
- ```xml
android:rating="@{Float.valueOf(books.rating),default=2.0}"
**4. Import package name conflict handling **
- If the package names we import conflict , We can go through `alias` Set an alias for it
- ```xml
// Pseudo code , Do not directly CV
<data>
<import type="com.xxx.a.Book" alias="aBook"/>
<import type="com.xxx.B.Book" alias="bBook"/>
...
</data>
5. Implicitly reference properties
- In a
viewQuote otherviewProperties of
- **`include`** Labels and **`ViewStub`** label
- `include` and `merge` The function of tags is to realize the reuse of layout files . That is to say , In order to reuse and integrate layout efficiently , Make the layout portable , We can use `include` and `merge` Tags embed one layout into another , Or extract the same elements from multiple layouts , Independent management , And then reuse it in various layouts , Convenient for unified adjustment . such as , Multiple pages in an application need to use a unified style title bar or bottom navigation bar , At this time, you can extract the layout of the title bar or the bottom navigation bar , And then to `include` The label form is embedded in the required layout , Not many times copy Code , In this way, you only need to modify one place when modifying . And we can also pass `DataBinding` To do data binding .
- for example ：
- ```xml
//layout_title.xml
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<import type="com.xxx.User" />
<variable
name="userInfo"
type="User" />
</data>
<android.support.constraint.ConstraintLayout
...
>
<TextView
...
android:text="@{userInfo.name}" />
</android.support.constraint.ConstraintLayout>
</layout>
- Use this layout , And pass the value
- ```
<include
layout="@layout/layout_title"
bind:test="@{userInfo}"/>
- ViewStub It's a similar use , Not here .
- DataBinding I won't support it merge label
**6. Bind click event **
- ```xml
// Pseudo code , Do not directly CV
onclick="@{()->user.testOnclick}"
onclick="@{(v)->user.testOnclick(v)}"
onclick="@{()->user.testOnclick(context)}"
onclick="@{BindHelp::staticClick}"
onclick="@{callback}"
// for example ：
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:onClick="@{()->user.testOnclick}"
/>
What the article talks about here is DataBinding How to set data , And by DataBinding stay xml Some basic uses in . If you just use DataBinding This function , That's a little overqualified . It also has a very powerful function that we haven't talked about yet , That is to refresh automatically when data is updated UI.
Realize automatic update when data changes UI
A common entity class or ViewModel After being updated , It won't let UI Auto update . And we hope , When the data changes UI To update automatically , Then it is necessary to automatically update the data when it changes UI, There are three ways to use , Namely
BaseObservable,
ObservableField,
ObservableCollection One way data binding ：
- BaseObservable
- BaseObservable Two refreshes are provided UI Methods , Namely notifyPropertyChanged() and notifyChange() .
- First step ： Modify entity class
- Inherit our entity class from BaseObservable. Fields that need to respond to changes , In the corresponding variable get Add... To the function @Bindable . then set in notifyChange yes kotlin Writing , Save it. java Of getter setter The way . Member attributes need to respond to changes , It's in it set Function ,notify Let's talk about attribute changes , that set When ,databinding You'll feel .
import androidx.databinding.BaseObservable
import androidx.databinding.Bindable
import androidx.databinding.library.baseAdapters.BR
class User() : BaseObservable() {
constructor(name: String, age: Int) : this() {
this.name = name
this.age = age
}
// This is alone in set On @bindable,name Can be a declaration private
var name: String = ""
set(value) {
field = value
notifyPropertyChanged(BR.name)
}
@Bindable
get() = field
// This is declared on the entire variable @bindable, So it has to be public Of
@Bindable
var age:Int = 18
set(value) {
field = value
notifyPropertyChanged(BR.age)
}
get() = field
}
- The second step ： stay `Activity` Use in
class MainActivity : AppCompatActivity() {
private val TAG = "MainActivity"
private lateinit var mainBinding: ActivityMainBinding
private lateinit var mainUser: User
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
mainBinding =
DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main)
mainUser = User("Taxze", 18)
mainUser.addOnPropertyChangedCallback(object : Observable.OnPropertyChangedCallback() {
override fun onPropertyChanged(sender: Observable, propertyId: Int) {
when {
BR.user == propertyId -> {
Log.d(TAG, "BR.user")
}
BR.age == propertyId -> {
Log.d(TAG, "BR.age")
}
}
}
})
mainBinding.user = mainUser
mainBinding.onClickPresenter = OnClickPresenter()
}
inner class OnClickPresenter {
fun changeName() {
mainUser.name = "Taxze2222222"
}
}
}
- Something to watch out for
- The official website just prompts to open `DataBinding` Only need `build.gradle` Add the following line of code to the
- ```
buildFeatures {
dataBinding true
}
however , If you want to use better `DataBinding` This is not enough , You also need to add these configurations ：
- ```
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
- a key ： In the use of `DataBinding` It's time ,`BR` object , I found that I couldn't call , The generation will also report an error , function , We need to `build.gradle` Configure in ：
apply plugin: 'kotlin-kapt'
kapt {
generateStubs = true
}
Then run the code again , You'll find out ,`BR` The file is automatically generated ！
- ObservableField
- Explained BaseObservable after , Now let's build the simplest and most commonly used . Just change the entity class to this ：
// Be careful observable The properties of require public jurisdiction , otherwise dataBinding You cannot process data responses through reflection
class User() : BaseObservable() {
var name: ObservableField<String> = ObservableField("Taxze")
var age:ObservableInt = ObservableInt(18)
}
- ObservableCollection
- dataBinding Wrapper classes are also provided to replace native List and Map, Namely ObservableList and ObservableMap
- Entity class modification ：
// Pseudo code , Do not directly cv
class User(){
var userMap = ObservableArrayMap<String,String>()
}
// When using ：
mainUser.userMap["name"] = "Taxze"
mainUser.userMap["age"] = "18"
Use `ObservableCollection` after ,`xml` Slightly different from the above , Mainly data acquisition , You need to specify the `Key` value
// Pseudo code , Do not directly cv
...
<import type="android.databinding.ObservableMap" />
<variable
name="userMap"
type="ObservableMap<String, String>" />
// When using ：
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Name"
android:text="@{userMap[`userName`]}" />
Two way data binding ：
- It only needs to be based on the previous one-way binding , Add layout file to
@{}Turn into@={}, It is used to monitor the user's update when the data of the attribute changes
DataBinding stay RecyclerView The use of
stay RecyclerView Use in DataBinding There was a slight change , We are ViewHolder In the middle of binding The production of objects , And the binding of data objects .
We use a very simple example to explain how to RecyclerView Use in DataBinding.
design sketch ：
- First step ： Create entity class
- That's what we had before , Used BaseObservable The entity class of , No more code here
- The second step ： establish activity_main To hold recyclerview
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activty_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</RelativeLayout>
- The third step ： establish text_item.xml For display recyclerview Every row of data in
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:tools="http://schemas.android.com/tools"
xmlns:android="http://schemas.android.com/apk/res/android">
<data>
<import type="com.taxze.jetpack.databinding.User" />
<variable
name="user"
type="User" />
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#ffffff"
android:orientation="horizontal"
android:paddingStart="10dp">
<TextView
android:id="@+id/tv_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:text="@{` This person's name is ` + user.name}" />
<TextView
android:id="@+id/tv_age"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="20dp"
android:text="@{String.valueOf(user.age)}" />
</LinearLayout>
</LinearLayout>
</layout>
- Step four ： establish Adapter
- After having the foundation before , It should be easy to see the following code , Don't explain too much
import android.content.Context
import android.view.LayoutInflater
import android.view.ViewGroup
import androidx.databinding.DataBindingUtil
import androidx.recyclerview.widget.RecyclerView
import com.taxze.jetpack.databinding.databinding.TextItemBinding
class FirstAdapter(users: MutableList<User>, context: Context) :
RecyclerView.Adapter<FirstAdapter.MyHolder>() {
// Declare... In the constructor binding Variable , such holder In order to quote , If not val/var, You can't quote , It needs to be in class Of {} Write in get function
class MyHolder(val binding: TextItemBinding) : RecyclerView.ViewHolder(binding.root)
private var users: MutableList<User> = arrayListOf()
private var context: Context
init {
this.users = users
this.context = context
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyHolder {
val inflater = LayoutInflater.from(context)
val binding: TextItemBinding =
DataBindingUtil.inflate(inflater, R.layout.text_item, parent, false)
return MyHolder(binding)
}
override fun onBindViewHolder(holder: MyHolder, position: Int) {
//java It can be written in setVariable
holder.binding.user = users[position]
holder.binding.executePendingBindings()
}
//kotlin in ,return The way , It can be abbreviated
override fun getItemCount() = users.size
}
- Step five ： stay MainActivity Use in
import android.os.Bundle
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
initView()
}
// to RecyclerView Set up the data
private fun initView() {
val recyclerView = findViewById<View>(R.id.recyclerView) as RecyclerView
recyclerView.layoutManager = LinearLayoutManager(this)
val users: MutableList<User> = ArrayList()
for (i in 0..100) {
val user = User()
user.name = "Taxze"
user.age = i
users.add(user)
}
val adapter = FirstAdapter(users, this)
recyclerView.adapter = adapter
}
}
This is done in RecyclerView Use in DataBinding La .
Advanced usage
first ： be used for appCompatImageView Custom properties for
// Pseudo code , Do not directly cv
/**
* be used for appCompatImageView Custom properties for ,bind:imgSrc, Namespace bind: It can be omitted , That's writing imgSrc Yes . Can be used to load url Pictures of the
* The function name is also arbitrary , Mainly value Statement of , Is the newly added attribute name , Multiple attributes can be used together , And configure whether it must work together
* The function name is arbitrary , Method signature is important , Match object control , And attribute parameters .
* You can also add old Parameters , Get and modify new parameters The previous corresponding value .
* todo Load network pictures , Network permissions are required !!!
*/
@JvmStatic
@BindingAdapter(value = ["bind:imgSrc"], requireAll = false)
fun urlImageSrc(view: AppCompatImageView, /*old: String?, */url: String) {
Glide.with(view)
.load(url)
.placeholder(R.drawable.img_banner)
.centerInside()
.into(view)
}
the second ： coordination swipeRefreshLayout The perception of the refresh state
- First step ： One way , Data changes , Refresh UI
// Pseudo code , Do not directly cv
@JvmStatic
@BindingAdapter("sfl_refreshing", requireAll = false)
fun setSwipeRefreshing(view: SwipeRefreshLayout, oldValue: Boolean, newValue: Boolean) {
// Determine whether it is a new value , Avoid falling into a dead cycle
if (oldValue != newValue)
view.isRefreshing = newValue
}
- The second step ：ui The state of , Reverse bind to data changes
// Pseudo code , Do not directly cv
@JvmStatic
@BindingAdapter("sfl_refreshingAttrChanged", requireAll = false)
fun setRefreshCallback(view: SwipeRefreshLayout, listener: InverseBindingListener?) {
listener ?: return
view.setOnRefreshListener {
// from ui The refresh state of the layer changes , Reverse notification of changes in the data layer
listener.onChange()
}
}
- The third step ： Implementation of reverse binding
// Pseudo code , Do not directly cv
/**
* Implementation of reverse binding , take UI The change of , Call back to bindingListener,listener will onChange, Notification of data changes
* Notice the attribute and event, It is effective only if it is consistent with the above two steps
*/
@JvmStatic
@InverseBindingAdapter(attribute = "sfl_refreshing", event = "sfl_refreshingAttrChanged")
fun isSwipeRefreshing(view: SwipeRefreshLayout): Boolean {
return view.isRefreshing
}
DataBinding coordination ViewModel&LiveData Use it together
I will take you through a simple example to learn how to use them together , Don't talk much , First on the renderings ：
- First step ： establish UserModel
// Inherit it from AndroidViewModel（AndroidViewModel It is also inherited from ViewModel Of , however ViewModel There is no way to get Context,AndroidViewModel Provide Application Used as a Context, And specially provide Application Single case ）
//UserName Use MutableLiveData
class UserModel(application: Application) : AndroidViewModel(application) {
var UserName = MutableLiveData("")
}
- The second step ： establish activity_main And corresponding MainActivity
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="loginModel"
type="com.taxze.jetpack.databinding.model.UserModel" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:id="@+id/linearLayout"
style="@style/InputBoxStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="17dp"
android:layout_marginEnd="17dp"
app:layout_constraintBottom_toTopOf="@+id/guideline2"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
tools:ignore="MissingConstraints">
<EditText
android:id="@+id/editText"
style="@style/EditTextStyle"
android:layout_width="match_parent"
android:layout_height="50dp"
android:hint=" Please enter your account number "
android:text="@={loginModel.UserName}"
tools:ignore="MissingConstraints" />
</LinearLayout>
<TextView
android:id="@+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text='@{" The account name you entered is ："+loginModel.UserName,default=123123123}'
android:textSize="24sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/button"
tools:ignore="MissingConstraints" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_percent="0.4" />
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:background="@drawable/button_drawable"
android:text=" Sign in "
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/linearLayout"
tools:ignore="MissingConstraints" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
- The third step ： stay MainActivity Binding page and binding declaration cycle
class MainActivity : AppCompatActivity() {
lateinit var viewDataBinding: ActivityMainBinding
lateinit var model: UserModel
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// Binding page
viewDataBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)
// Binding lifecycle
viewDataBinding.lifecycleOwner = this
model = ViewModelProvider.AndroidViewModelFactory.getInstance(this.application)
.create(UserModel::class.java)
viewDataBinding.loginModel = model
...
}
}
- Step four ： Pass value
viewDataBinding.button.setOnClickListener {
val intent = Intent([email protected] this, SecondActivity::class.java)
intent.putExtra("user", "${model.UserName.value}")
startActivity(
intent
)
}
- Step five ： On the other side activity Call in
class SecondActivity : AppCompatActivity() {
lateinit var viewDataBinding: ActivitySecondBinding
lateinit var userName: String
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// Binding page
viewDataBinding = DataBindingUtil.setContentView(this, R.layout.activity_second)
// Binding lifecycle
viewDataBinding.lifecycleOwner = this
userName = intent.getStringExtra("user").toString()
viewDataBinding.tvName.text = " The login account is ：$userName"
}
}
Help you step on the pit ：
TextViewOftextattribute , We need to pay attention to data Not forNumbertype
xmlChinese characters cannot be Chinese （ Check your input method ）
- Reflection attribute 、 The function must be
public
observableFieldData time , In some cases, initialization is required , Otherwise, an error will be reported ！
- Use
LiveDataAsdataBindingWhen , Need to be inuiSet inbinding.lifecycleOwner
Epilogue
This article has been described in great detail DataBinding Most uses of , But after reading the article , You still need to practice more , I believe you will soon master DataBinding La If you have any questions, please leave a message in the comment area to discuss ~
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Learn how to use LiveData and ViewModel, I believe it will make you relaxed when writing business
When you really learn DataBinding after , You'll find that “ This thing smells good ”! ( this paper )
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