The Data Binding Library is a support library in Android application development which allows binding UI components of the layouts not programmatically rather in a declarative format.<\/p>\n
Android Data Binding Library can remove so many lines of boilerplate code. But it may require additional classes too. Therefore, we need to care and keep it in balance while using it.<\/p>\n
The library increases the readability of the codes. But it absolutely depends on the developer. New developers may find it difficult at first. But once developers get used to it, it looks more readable to them.<\/p>\n
The code has more power, you can implement whatever you like in code. We can think of it like, implementing a task without data binding is quite long to developers and with data binding, we have the power to implement it using fewer codes.<\/p>\n
We are used to with the method findViewById() to access the UI components of our layouts. But Data Binding is faster than using this.<\/p>\n
It\u2019s helpful that we don\u2019t need to think of the process to bind every UI component individually (and typecasting). Rather this library will generate classes for UI components automatically. It’s true it will increase the app size, but again only if you have tons of it.<\/p>\n
The Data Binding Library is a support library. Therefore it offers both flexibility and compatibility to previous API levels. For now, we can use it with devices running Android 4.0 (API level 14) or higher. The recommendation is to use the latest Android Plugin for Gradle in the project. However, this library supports version 1.5.0 and higher.
\nAt first, we need to download the library from Support Repository using the Android SDK manager. Then we can configure our project to use a data binding library. To use it, we need to add the element to our build. gradle file of the app module. Let\u2019s go through some codes.<\/p>\n
\/\/ This is the android section from the file build.gradle (app)\r\nandroid {\r\n\u00a0\u00a0\u00a0compileSdkVersion 29\r\n buildToolsVersion \"29.0.1\"\r\n defaultConfig {\r\n\u00a0\u00a0\u00a0applicationId \"com.example.databindinglibrary\"\r\n\u00a0\u00a0\u00a0minSdkVersion 21\r\n\u00a0\u00a0\u00a0targetSdkVersion 29\r\n \u00a0\u00a0versionCode 1\r\n \u00a0\u00a0versionName \"1.0\"\r\n testInstrumentationRunner \"androidx.test.runner.AndroidJUnitRunner\"\r\n \u00a0\u00a0}\r\n \u00a0buildTypes {\r\n \u00a0\u00a0release {\r\n\u00a0\u00a0\u00a0minifyEnabled false\r\n\u00a0\u00a0\u00a0proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'\r\n \u00a0\u00a0}\r\n \u00a0}\r\n }<\/pre>\nWe will add the data-binding element now.\r\n\/\/ Upon adding the data-binding element\r\nandroid {\r\n compileSdkVersion 29\r\n\u00a0\u00a0buildToolsVersion \"29.0.1\"\r\n \u00a0defaultConfig {\r\n\u00a0\u00a0applicationId \"com.example.databindinglibrary\"\r\n minSdkVersion 21\r\n\u00a0\u00a0targetSdkVersion 29\r\n\u00a0\u00a0versionCode 1\r\n\u00a0\u00a0versionName \"1.0\"\r\n\u00a0\u00a0testInstrumentationRunner \"androidx.test.runner.AndroidJUnitRunner\"\r\n\u00a0}\r\nbuildTypes {\r\nrelease {\r\n minifyEnabled false\r\n proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'\r\n }\r\n}\r\n\/\/ Enable Android data binding library\r\n\u00a0dataBinding {\r\n\u00a0\u00a0 enabled true\r\n\u00a0\u00a0 }\r\n}\r\n<\/pre>\nSo, our data binding library is enabled now. There is a new compiler for generating data binding classes that have been introduced at the Android Gradle plugin version 3.1.0-alpha06. It creates the data binding classes incrementally, which in most cases increases the speed of the build process. To enable it, we need to add the following line at gradle.properties file.<\/p>\n
android.databinding.enableV2=true<\/pre>\nLet\u2019s use Android Data Binding<\/h3>\n
Suppose, the below codes are from the current activity layout.<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<androidx.constraintlayout.widget.ConstraintLayout\r\nxmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\nxmlns:app=\"http:\/\/schemas.android.com\/apk\/res-auto\"\r\nxmlns:tools=\"http:\/\/schemas.android.com\/tools\"\r\nandroid:layout_width=\"match_parent\"\r\nandroid:layout_height=\"match_parent\"\r\ntools:context=\".MainActivity\">\r\n<TextView\r\nandroid:layout_width=\"wrap_content\"\r\nandroid:layout_height=\"wrap_content\"\r\nandroid:text=\"Hello World!\"\r\napp:layout_constraintBottom_toBottomOf=\"parent\"\r\napp:layout_constraintLeft_toLeftOf=\"parent\"\r\napp:layout_constraintRight_toRightOf=\"parent\"\r\napp:layout_constraintTop_toTopOf=\"parent\"\/>\r\n<\/androidx.constraintlayout.widget.ConstraintLayout>\r\nAnd the activity codes are,\r\npackage com.example.databindinglibrary\r\nimport android.os.Bundle\r\nimport androidx.appcompat.app.AppCompatActivity\r\nclass MainActivity : AppCompatActivity() {\r\noverride fun onCreate(savedInstanceState: Bundle?) {\r\nsuper.onCreate(savedInstanceState)\r\nsetContentView(R.layout.activity_main)\r\nfindViewById<TextView>(R.id.text_view_title).text = getString(R.string.app_name)\r\n\u00a0\u00a0\u00a0\u00a0}\r\n}\r\n<\/pre>\nNow, if we want to add data binding here, we need to introduce <layout> as the root tag. Go through the below codes,<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<layout\r\nxmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\nxmlns:app=\"http:\/\/schemas.android.com\/apk\/res-auto\"\r\nxmlns:tools=\"http:\/\/schemas.android.com\/tools\">\r\n<androidx.constraintlayout.widget.ConstraintLayout\r\nandroid:layout_width=\"match_parent\"\r\nandroid:layout_height=\"match_parent\"\r\ntools:context=\".MainActivity\">\r\n<TextView\r\nandroid:layout_width=\"wrap_content\"\r\nandroid:layout_height=\"wrap_content\"\r\nandroid:text=\"Hello World!\"\r\napp:layout_constraintBottom_toBottomOf=\"parent\"\r\napp:layout_constraintLeft_toLeftOf=\"parent\"\r\napp:layout_constraintRight_toRightOf=\"parent\"\r\napp:layout_constraintTop_toTopOf=\"parent\"\/>\r\n<\/androidx.constraintlayout.widget.ConstraintLayout>\r\n<\/layout>\r\n<\/pre>\nNow, open your activity codes. Remove the line with findViewById() method. Following are from our activity,<\/p>\n
package com.example.databindinglibrary\r\nimport android.os.Bundle\r\nimport androidx.appcompat.app.AppCompatActivity\r\n class MainActivity : AppCompatActivity() {\r\n override fun onCreate(savedInstanceState: Bundle?) {\r\n super.onCreate(savedInstanceState)\r\n setContentView(R.layout.activity_main)\r\n }\r\n}\r\n<\/pre>\nWe will introduce a binding object here. The object will be of a binding class that will be auto-generated by the data binding compiler. The auto-generated class will be named from the name of our layout file. If the layout file name is \u201cactivity_main\u201d, then the generated class name will be ActivityMainBinding. We will replace the previous setContentView() method of the activity by setContentView() method of a utility class DataBindingUtil. It will inflate the layout, set it to activate and return the binding object which we will keep at our activity\/fragment. After initialization, we can easily use this object to access our UI components. Below, we have used our binding object to set the text to our only TextView.<\/p>\n
package com.example.databindinglibrary\r\nimport android.os.Bundle\r\nimport androidx.appcompat.app.AppCompatActivity\r\nimport androidx.databinding.DataBindingUtil\r\nimport com.example.databindinglibrary.databinding.ActivityMainBinding\r\nclass MainActivity : AppCompatActivity() { \u00a0\u00a0\u00a0\u00a0\u00a0\r\n private lateinit var mBinding: ActivityMainBinding\r\n \u00a0\u00a0\u00a0override fun onCreate(savedInstanceState: Bundle?) {\r\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.onCreate(savedInstanceState)\r\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)\r\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mBinding.textViewTitle.text = getString(R.string.app_name)\r\n \u00a0\u00a0\u00a0}\r\n}\r\n<\/pre>\nThus, we are getting rid of findViewById() method. Android Data Binding library is providing much flexibility to us.
\nUse of <data> section
\nAnother way of accessing our UI components is passing the required variables to our layout and setting the values at our layout (.xml) files. Have a look at the below codes,<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<layout\r\n\u00a0\u00a0\u00a0\u00a0xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n\u00a0\u00a0\u00a0\u00a0xmlns:app=\"http:\/\/schemas.android.com\/apk\/res-auto\"\r\n\u00a0\u00a0\u00a0\u00a0xmlns:tools=\"http:\/\/schemas.android.com\/tools\">\r\n\u00a0\u00a0\u00a0\u00a0<data>\r\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<variable name=\"title\" type=\"String\"\/>\r\n \u00a0\u00a0\u00a0<\/data>\r\n \u00a0\u00a0\u00a0<androidx.constraintlayout.widget.ConstraintLayout\r\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:layout_width=\"match_parent\"\r\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:layout_height=\"match_parent\"\r\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0tools:context=\".MainActivity\">\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<TextView\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:id=\"@+id\/text_view_title\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:layout_width=\"wrap_content\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:layout_height=\"wrap_content\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:text=\"@{title}\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintBottom_toBottomOf=\"parent\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintLeft_toLeftOf=\"parent\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintRight_toRightOf=\"parent\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintTop_toTopOf=\"parent\"\/>\r\n\u00a0\u00a0\u00a0\u00a0<\/androidx.constraintlayout.widget.ConstraintLayout>\r\n<\/layout><\/pre>\nWe have introduced a new tag named <data> here. This is the section where we will declare our variables. Here we have one variable named \u201ctitle\u201d which is an object of String class. And this variable value is set to our TextView. We will put a @{} and place the variable inside the brackets to use the value of it. We will pass the value to this variable from the activity\/fragment. Follow the codes,<\/p>\n
package com.example.databindinglibrary\r\nimport android.os.Bundle\r\nimport androidx.appcompat.app.AppCompatActivity\r\nimport androidx.databinding.DataBindingUtil\r\nimport com.example.databindinglibrary.databinding.ActivityMainBinding\r\nclass MainActivity : AppCompatActivity() {\r\n\u00a0\u00a0\u00a0\u00a0private lateinit var mBinding: ActivityMainBinding\r\n\u00a0\u00a0\u00a0\u00a0override fun onCreate(savedInstanceState: Bundle?) {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.onCreate(savedInstanceState)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mBinding.title = getString(R.string.app_name)\r\n\u00a0\u00a0\u00a0\u00a0}\r\n}\r\n<\/pre>\nUse of custom model class<\/h3>\n
Well, we can use a custom model too to set the values to the UI components. Let\u2019s create a custom model class. We name it as Student.<\/p>\n
package com.example.databindinglibrary \u00a0\r\ndata class Student(\r\n val name: String?,\r\n val ID: String\r\n) \u00a0\r\n<\/pre>\nNow, we will re-arrange our layout file to show a student\u2019s name and id. Codes are at below,<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<layout \u00a0\u00a0\u00a0\u00a0\r\nxmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\" \u00a0\u00a0\u00a0\u00a0\r\nxmlns:app=\"http:\/\/schemas.android.com\/apk\/res-auto\"\r\nxmlns:tools=\"http:\/\/schemas.android.com\/tools\"> \u00a0\r\n\u00a0\u00a0\u00a0\u00a0<data>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<variable name=\"student\" type=\"com.example.databindinglibrary.Student\"\/>\r\n\u00a0\u00a0\u00a0\u00a0<\/data> \u00a0 \u00a0\u00a0\u00a0\u00a0\r\n<androidx.constraintlayout.widget.ConstraintLayout \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:layout_width=\"match_parent\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:layout_height=\"match_parent\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\ntools:context=\".MainActivity\"> \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n<TextView \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:id=\"@+id\/text_view_name\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:layout_width=\"wrap_content\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:layout_height=\"wrap_content\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:text=\"@{student.name}\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:textSize=\"18sp\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:textStyle=\"bold\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\napp:layout_constraintVertical_chainStyle=\"packed\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\napp:layout_constraintBottom_toTopOf=\"@+id\/text_view_id\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\napp:layout_constraintLeft_toLeftOf=\"parent\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\napp:layout_constraintRight_toRightOf=\"parent\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\napp:layout_constraintTop_toTopOf=\"parent\"\/> \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n<TextView \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:id=\"@+id\/text_view_id\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:layout_width=\"wrap_content\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:layout_height=\"wrap_content\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:layout_marginTop=\"16dp\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:text=\"@{student.ID}\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\nandroid:textSize=\"16sp\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\napp:layout_constraintBottom_toBottomOf=\"parent\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\napp:layout_constraintLeft_toLeftOf=\"parent\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\napp:layout_constraintRight_toRightOf=\"parent\" \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\napp:layout_constraintTop_toBottomOf=\"@+id\/text_view_name\"\/> \u00a0 \u00a0\u00a0\u00a0\u00a0\r\n<\/androidx.constraintlayout.widget.ConstraintLayout> \u00a0\r\n<\/layout><\/pre>\nAt the activity, we will create the student object and pass it to our layout now.<\/p>\n
package com.example.databindinglibrary\r\nimport android.os.Bundle\r\nimport androidx.appcompat.app.AppCompatActivity\r\nimport androidx.databinding.DataBindingUtil\r\nimport com.example.databindinglibrary.databinding.ActivityMainBinding\r\nclass MainActivity : AppCompatActivity() {\r\n private lateinit var mBinding: ActivityMainBinding\r\n override fun onCreate(savedInstanceState: Bundle?) {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.onCreate(savedInstanceState)\r\n mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main) \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n val student = Student(\"Student Name\", \"Student ID\")\r\n mBinding.student = student\r\n }\r\n}\r\n<\/pre>\nHandle null<\/h3>\n
Auto-generated data-binding codes check automatically if there is any null value. It tries to avoid NPE (Null Pointer Exception). For example, we can pass null as the name of the student and it won\u2019t crash the application as data binding methods handle this.<\/p>\n
package com.example.databindinglibrary \u00a0\r\nimport android.os.Bundle\r\nimport androidx.appcompat.app.AppCompatActivity\r\nimport androidx.databinding.DataBindingUtil\r\nimport com.example.databindinglibrary.databinding.ActivityMainBinding \u00a0\r\nclass MainActivity : AppCompatActivity() { \u00a0\r\n\u00a0\u00a0\u00a0\u00a0private lateinit var mBinding: ActivityMainBinding \u00a0\r\n\u00a0\u00a0\u00a0\u00a0override fun onCreate(savedInstanceState: Bundle?) {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.onCreate(savedInstanceState)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main) \u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0val student = Student(null, \"Student ID\")\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mBinding.student = student\r\n\u00a0\u00a0\u00a0\u00a0}\r\n}\r\n<\/pre>\nUse of import<\/h3>\n
Another thing we will focus on the <data> section is we can import reference classes inside the layout file which can be used later to meet use-cases. At first, let\u2019s change the model class a bit. Follow the codes,<\/p>\n
package com.example.databindinglibrary \u00a0\r\ndata class Student(\r\n\u00a0\u00a0\u00a0\u00a0val name: String?,\r\n\u00a0\u00a0\u00a0\u00a0val ID: String,\r\n\u00a0\u00a0\u00a0\u00a0val shouldShow: Boolean\r\n)<\/pre>\nWe have added a Boolean field shouldShow which will define if we want to show the student\u2019s name or not. We have used it in the layout.<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<layout\r\n\u00a0\u00a0\u00a0\u00a0xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n\u00a0\u00a0\u00a0\u00a0xmlns:app=\"http:\/\/schemas.android.com\/apk\/res-auto\"\r\n\u00a0\u00a0\u00a0\u00a0xmlns:tools=\"http:\/\/schemas.android.com\/tools\"> \u00a0\r\n\u00a0\u00a0\u00a0<data>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<import type=\"android.view.View\"\/>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<variable name=\"student\" type=\"com.example.databindinglibrary.Student\"\/>\r\n\u00a0\u00a0\u00a0\u00a0<\/data> \u00a0\r\n\u00a0\u00a0\u00a0\u00a0<androidx.constraintlayout.widget.ConstraintLayout\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:layout_width=\"match_parent\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:layout_height=\"match_parent\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0tools:context=\".MainActivity\"> \u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<TextView\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:id=\"@+id\/text_view_name\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:layout_width=\"wrap_content\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:layout_height=\"wrap_content\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:text=\"@{student.name}\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:visibility=\"@{student.shouldShow ? View.VISIBLE : View.INVISIBLE}\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:textSize=\"18sp\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:textStyle=\"bold\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintVertical_chainStyle=\"packed\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintBottom_toTopOf=\"@+id\/text_view_id\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintLeft_toLeftOf=\"parent\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintRight_toRightOf=\"parent\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintTop_toTopOf=\"parent\"\/> \u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<TextView\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:id=\"@+id\/text_view_id\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:layout_width=\"wrap_content\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:layout_height=\"wrap_content\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:layout_marginTop=\"16dp\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:text=\"@{student.ID}\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0android:textSize=\"16sp\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintBottom_toBottomOf=\"parent\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintLeft_toLeftOf=\"parent\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintRight_toRightOf=\"parent\"\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0app:layout_constraintTop_toBottomOf=\"@+id\/text_view_name\"\/> \u00a0\r\n\u00a0\u00a0\u00a0\u00a0<\/androidx.constraintlayout.widget.ConstraintLayout> \u00a0\r\n<\/layout>\u00a0 \u00a0\r\nAnd the change of activity codes will be, \u00a0\r\npackage com.example.databindinglibrary \u00a0\r\nimport android.os.Bundle\r\nimport androidx.appcompat.app.AppCompatActivity\r\nimport androidx.databinding.DataBindingUtil\r\nimport com.example.databindinglibrary.databinding.ActivityMainBinding \u00a0\r\nclass MainActivity : AppCompatActivity() { \u00a0\r\n\u00a0\u00a0\u00a0\u00a0private lateinit var mBinding: ActivityMainBinding \u00a0\r\n\u00a0\u00a0\u00a0\u00a0override fun onCreate(savedInstanceState: Bundle?) {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.onCreate(savedInstanceState)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main) \u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0val student = Student(\"Student Name\", \"Student ID\", false)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mBinding.student = student\r\n\u00a0\u00a0\u00a0\u00a0}\r\n}<\/pre>\nGet a view from the binding object<\/h3>\n
To get a view object from the binding object, we will use simple getRoot() method to get the desired view.<\/p>\n
package com.example.databindinglibrary \u00a0\r\nimport android.os.Bundle\r\nimport androidx.appcompat.app.AppCompatActivity\r\nimport androidx.databinding.DataBindingUtil\r\nimport com.example.databindinglibrary.databinding.ActivityMainBinding \u00a0\r\nclass MainActivity : AppCompatActivity() { \u00a0\r\n\u00a0\u00a0\u00a0\u00a0private lateinit var mBinding: ActivityMainBinding \u00a0\r\n\u00a0\u00a0\u00a0\u00a0override fun onCreate(savedInstanceState: Bundle?) {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0super.onCreate(savedInstanceState)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main) \u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0val student = Student(\"Student Name\", \"Student ID\", false)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mBinding.student = student \u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0val view = mBinding.root\r\n\u00a0\u00a0\u00a0\u00a0}\r\n}\r\n<\/pre>\nFinal Word<\/h4>\n
Android Data Binding library is really new and quite supportive. It helps us to get more power of our UI components and even it decreases the error rate. Get the demonstrated codes from here<\/a>. Stay with us.<\/span> References:<\/span>
\nhttps:\/\/github.com\/Rifat15913\/explore-android-data-binding.git<\/a><\/span>
\nhttps:\/\/developer.android.com\/topic\/libraries\/data-binding<\/a><\/span>
\nhttps:\/\/www.vogella.com\/tutorials\/AndroidDatabinding\/article.html<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"The Data Binding Library is a support library in Android application development which allows binding UI components of the layouts not programmatically rather in a declarative format. Why use the Android Data Binding library? Remove boilerplate code Android Data Binding Library can remove so many lines of boilerplate code. But it may require additional classes […]<\/p>\n","protected":false},"author":2,"featured_media":463,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[45,46,49],"tags":[],"yoast_head":"\n
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