MainActivity.kt
package com.example.jetpack
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
btn.setOnClickListener {
val list = generateList()
textView.text = "Employees:\n"
// Iterate through the list
list.forEach {
textView.append("\n${it.name} : age ${it.age} : salary $${it.salary}")
}
}
btnSort.setOnClickListener {
val list = generateList()
// List sort by multiple fields
list.sortWith(
compareBy<Employee>{
// Name in ascending order
it.name
}.thenByDescending {
// Then age in descending order
it.age
}
)
textView.text = "Sort name ASC and age DESC order\n"
// Iterate through the sorted list
list.forEach {
textView.append("\n${it.name} : age ${it.age} : salary $${it.salary}")
}
}
}
}
// Method to generate employee list
private fun generateList():MutableList<Employee>{
val list = mutableListOf<Employee>()
list.add(Employee("Weston",25,6500))
list.add(Employee("Gregg",29,5400))
list.add(Employee("Ana",24,5200))
list.add(Employee("Raymond",19,4900))
list.add(Employee("Uriel",20,2300))
list.add(Employee("Amy",19,4650))
list.add(Employee("Toya",16,5100))
list.add(Employee("Amy",20,2600))
list.add(Employee("Innee",48,4100))
list.add(Employee("Isaias",16,6800))
list.add(Employee("Raymond",48,4500))
return list
}
// Data class for Employee
data class Employee(
val name:String,
val age:Int,
val salary:Int
)
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
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"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="List"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/btnSort"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="Sort ASC Desc Multiple"
app:layout_constraintStart_toEndOf="@+id/btn"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="16dp"
android:padding="16dp"
android:text="List Example"
android:textAppearance="@style/TextAppearance.AppCompat.Medium"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/btn"
android:textStyle="bold" />
</androidx.constraintlayout.widget.ConstraintLayout>

