android kotlin - TimePickerDialog example

MainActivity.kt

package com.cfsuman.kotlintutorials

import android.os.Bundle
import android.widget.*
import androidx.appcompat.app.AppCompatActivity


class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Get the widgets reference from XML layout
        val button = findViewById<Button>(R.id.button)

        // Set a click listener for button widget
        button.setOnClickListener{
            // Initialize a new TimePickerFragment
            val newFragment = TimePickerFragment()
            // Show the time picker dialog
            newFragment.show(
                supportFragmentManager,
                "Time Picker"
            )
        }
    }
}

TimePickerFragment.kt

package com.cfsuman.kotlintutorials

import android.app.TimePickerDialog
import android.os.Bundle
import android.widget.TextView
import android.app.Dialog
import java.util.Calendar
import android.widget.TimePicker
import androidx.fragment.app.DialogFragment


class TimePickerFragment : DialogFragment(),
    TimePickerDialog.OnTimeSetListener {
    private lateinit var calendar:Calendar

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        // Initialize a Calendar instance
        calendar = Calendar.getInstance()

        // Get the system current hour and minute
        val hour = calendar.get(Calendar.HOUR_OF_DAY)
        val minute = calendar.get(Calendar.MINUTE)

        // Create a TimePickerDialog with system current time
        // Return the TimePickerDialog
        return TimePickerDialog(
            requireActivity(), // Context
            // Put 0 to system default theme or remove this parameter
            0, // Theme
            this, // TimePickerDialog.OnTimeSetListener
            hour, // Hour of day
            minute, // Minute
            false // Is 24 hour view
        )
    }


    override fun onTimeSet(view: TimePicker, hourOfDay: Int, minute: Int) {
        // Do something with the returned time
        val textView:TextView = requireActivity()
            .findViewById(R.id.textView) as TextView

        textView.text = "Selected Time ${getHourAMPM(hourOfDay)}" +
                ":$minute ${getAMPM(hourOfDay)}"
    }



    // Custom method to get AM PM value from provided hour
    private fun getAMPM(hour:Int):String{
        return if(hour>11)"PM" else "AM"
    }


    // Custom method to get hour for AM PM time format
    private fun getHourAMPM(hour:Int):Int{
        // Return the hour value for AM PM time format
        var modifiedHour = if (hour>11)hour-12 else hour
        if (modifiedHour == 0){modifiedHour = 12}
        return modifiedHour
    }
}

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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/rootLayout"
    android:background="#DCDCDC"
    android:padding="24dp">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Show TimePicker Dialog"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="64dp"
        android:fontFamily="sans-serif"
        android:textAlignment="center"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

</androidx.constraintlayout.widget.ConstraintLayout>