Create An Android TimePicker Programmatically in Kotlin

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Hello Readers! In this post, we are going to learn about how to use android timePicker programmatically in kotlin in the application. We will also learn how to add timePicker to linearLayout programmatically in android application.

Output

Tutorialwing Kotlin Dynamic TimePicker Output Android TimePicker Programmatically in kotlin

Tutorialwing Kotlin Dynamic TimePicker Output

Getting Started

At first, we will create android project. Then, we will create and use timePicker programmatically in kotlin file.

1. Creating New Project in Kotlin

Follow the steps below to create new project. Please ignore the steps if you have already created a new project.

Step Description
1. Open Android Studio.
2. Go to File => New => New Project. Write application name as DynamicTimePicker. Then, check Include Kotlin Support and click next button.
3. Select minimum SDK you need. However, we have selected 17 as minimum SDK. Then, click next button
4. Then, select Empty Activity => click next => click finish.
5. At this point, You will get a newly created android project successfully.

Now, we will modify xml and kotlin file to use timePicker dynamically.

2. Modify Values Folder

Open res/values/strings.xml file. Then, add below code into it.

<resources>
	<string name="app_name">DynamicTimePicker</string>
	<string name="selected_time">The selected time is:</string>
</resources>

3. Modify Layout Folder

Open res/layout/activity_main.xml file. Then, add below code into it.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:gravity="center"
	android:orientation="vertical">

	<LinearLayout
		android:id="@+id/rootContainer"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:orientation="vertical">

	</LinearLayout>

	<TextView
		android:id="@+id/textView"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:layout_marginLeft="35dp"
		android:layout_marginTop="30dp"
		android:visibility="gone"/>

</LinearLayout>

In activity_main.xml file, we have defined textView and LinearLayout, with id rootContainer, that will act as container for the timePicker widget created programmatically in the application. TextView will be used to show the selected time in the timePicker widget in the application.

4. Create Android TimePicker Programmatically / Dynamically in Kotlin

Open app/src/main/java/com.tutorialwing.dynamictimepicker/MainActivity.kt file. Then, add below code into it.

package com.tutorialwing.dynamictimepicker

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.View
import android.view.ViewGroup
import android.widget.LinearLayout
import android.widget.TextView
import android.widget.TimePicker

class MainActivity : AppCompatActivity() {

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

        val textView = findViewById<TextView>(R.id.textView)

        val timePicker = TimePicker(this)
        val layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        layoutParams.setMargins(20, 20, 20, 20)
        timePicker.layoutParams = layoutParams
        timePicker.setOnTimeChangedListener { view, hourOfDay, minute ->

            var hourOfDay = hourOfDay

            var format = ""
            if (hourOfDay == 0) {
                hourOfDay += 12
                format = "AM"
            } else if (hourOfDay == 12) {
                format = "PM"
            } else if (hourOfDay > 12) {
                hourOfDay -= 12
                format = "PM"
            } else {
                format = "AM"
            }

            val hour = if (hourOfDay < 10) "0" + hourOfDay else hourOfDay
            val min = if (minute < 10) "0" + minute else minute

            val text = getString(R.string.selected_time) + " " + hour + " : " + min + " " + format
            textView.text = text
            textView.visibility = View.VISIBLE
        }

        val linearLayout = findViewById<LinearLayout>(R.id.rootContainer)
        linearLayout?.addView(timePicker)
    }
}

We have created timePicker programmatically in kotlin file (i.e. MainActivity.kt file) in the application. Then, we have set layout params, margins etc. in it. After that, we have set time change listener to show the selected time in textView.

Since AndroidManifest.xml file is very important in any android application, we are also going to see the content inside this file.

AndroidManifest.xml file

Code inside src/main/AndroidManifest.xml file is –

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.dynamictimepicker"
		  xmlns:android="http://schemas.android.com/apk/res/android">

	<application
		android:allowBackup="true"
		android:icon="@mipmap/ic_launcher"
		android:label="@string/app_name"
		android:roundIcon="@mipmap/ic_launcher_round"
		android:supportsRtl="true"
		android:theme="@style/AppTheme">
		<activity android:name=".MainActivity">
			<intent-filter>
				<action android:name="android.intent.action.MAIN"/>

				<category android:name="android.intent.category.LAUNCHER"/>
			</intent-filter>
		</activity>
	</application>

</manifest>

When we run the program, we will get output as shown above.

That’s end of our tutorial on Creating Android TimePicker Programmatically in Kotlin.

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We have recently published 100+ articles on android tutorials with kotlin and java. If you need, you may visit Android Tutorial for beginners page. You can also check Kotlin Tutorial for beginners