Data binding offers flexibility as well as broad compatibility to your code. we have been using Data Binding Library to bind application logic and layouts. It’s a library that allows you to bind the data of your models directly to the xml views in a very flexible way. Kotlin very much supports Data Binding Library. We can still bind our layouts with the Kotlin class. If you want to use data binding and Kotlin, here are a few things to keep in mind: Data binding is a support library, so it can be used with all Android platform versions all the way back to Android 2.1 (API level 7+). To use data binding, you need Android Plugin for Gradle 1.5.0-alpha1 or higher. You can see here how to update the Android Plugin for Gradle. Android Studio 3.0 fully supports kotlin First of all, create an Android Studio project and add a dependency for Kotlin and few changes for your Project level build.gradle We also need to add the Data Binding dependency and the ones of Kotlin to the build.gradle file of our app. //Notice that I made the compiler version a variable in the project level build gradle so it can be managed from a single place. That’s all the configuration we need to start using Data Binding with Kotlin. Now for Kotlin and Data Binding to work together, add a Kotlin Model Class. This model class is going to bind your layout with your Kotlin activity class.
<?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="nithya"
type="com.example.databinding.Name" />
</data>
<LinearLayout
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"
tools:context=".MainActivity">
<EditText
android:id="@+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView
android:text="@={nithya.names}"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/ts"/>
<Button
android:text="submit"
android:id="@+id/btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</layout>package com.example.databinding
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.databinding.DataBindingUtil
import com.example.databinding.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
lateinit var dataBinding:ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
dataBinding = DataBindingUtil.setContentView(this,R.layout.activity_main)
dataBinding.btn.setOnClickListener{
Anusha()
}
}
private fun Anusha() {
// TODO("Not yet implemented")
val n=dataBinding.name.text.toString()
val d=Name(n)
dataBinding.nithya=d
//dataBinding.ts.text=d.names
// dataBinding.ts.text=n
}
}data class Name(var names:String = " ")<?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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:id="@+id/plus"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:text="+"
android:textSize="50dp" />
<TextView
android:id="@+id/zero"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="8"
android:gravity="center"
android:text="0"
android:textSize="190dp"
/>
<Button
android:id="@+id/minus"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:text="-"
android:textSize="50dp" />
</LinearLayout>
</layout>package com.example.databinding2
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.databinding.DataBindingUtil
import com.example.databinding2.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
lateinit var binding:ActivityMainBinding
var count=0
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding= DataBindingUtil.setContentView(this,R.layout.activity_main)
binding.plus.setOnClickListener{
count++
binding.zero.text=count.toString()
}
binding.minus.setOnClickListener{
count--
binding.zero.text=count.toString()
}
}
}
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