Android TabHost In Kotlin With Example

Greetings!
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. Also, if you are interested in content writing, you can mail us at tutorialwing@gmail.com.

Hello Readers! In this post, we are going to learn about how to use android tabHost in kotlin in any android application. We will also go through different attributes of TabHost widget that can be used to customise it.

Output

Tutorialwing Android TabHost Output Android TabHost in Kotlin Tutorial With Example

Tutorialwing Android TabHost Output

Getting Started

TabHost widget can be defined as below –

TabHost is a container for the tabbed window view.

TabHost contains two children. They are –
(a) A set of tab labels that user clicks to select a specific tab.
(b) A FrameLayout object that displays the selected tab views.

Attributes of Android TabHost Widget

Some of the popular attributes of android TabHost widget inherited from FrameLayout are –

Sr. XML Attributes Description
1 android:foregroundGravity Defines the gravity of the foreground drawable
2 android:measureAllChildren Defines whether to measure all children or only those in VISIBLE or INVISIBLE state when measuring

Some of the popular attributes of android TabHost widget inherited from ViewGroup are –

Sr. XML Attributes Description
1 android:animateLayoutChanges Defines whether LayoutTransition should run whenever there is any changes in layout
2 android:animationCache Defines whether layout animations should create a drawing cache for their children.
3 android:clipToPadding Defines whether the ViewGroup will clip its children and resize (but not clip) any EdgeEffect to its padding, if padding is not zero.
4 android:layoutAnimation Defines the layout animation to use the first time the ViewGroup is laid out.
5 android:layoutMode Defines the layout mode of this viewGroup

Some of the popular attributes of android TabHost widget inherited from View are –

Sr. XML Attributes Description
1 android:alpha Defines the alpha of the view
2 android:background Defines the background of the view
3 android:padding Defines padding of the view for all edges
4 android:tooltipText Defines text displayed in a small popup window on hover or long press
5 android:clickable Defines whether view is clickable or not
6 android:theme Defines a theme override for view
7 android:id Defines id of the view
8 android:padding Defines padding of the view



Example of Android TabHost In Kotlin

At first, we will create android application. Then, we will use TabHost widget in this application.

1. Creating New Project in Kotlin

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

Step Description
1. Open Android Studio.
2. Go to File => New => New Project. Write application name as TabHost. 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. You will get a newly created project successfully if you have followed steps properly.

2. Modify Values folder

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

<resources>
	<string name="app_name">TabHost</string>
	<string name="presented_by">Presented by Tutorialwing.com</string>
	<string name="no_image">No Image</string>
	<string name="profile">Profile</string>
	<string name="recent">Recent</string>
	<string name="home">Home</string>
</resources>

3. Create Pages for Each Tab in TabHost

In this tutorial, we are going to show three tabs in the application. So, we will create three pages for tab. Their name would be as follows –
(a) HomeActivity.kt and xml file (activity_main.xml)
(b) RecentActivity.kt and xml file (activity_recent.xml)
(c) ProfileActivity.kt and xml file (activity_profile.xml)

3.1 Create First Page(Home Page) of TabHost

Create a new kotlin file, HomeActivity.kt, in main/java/com.tutorialwing.tabhost folder. Then, add below code into it.

package com.tutorialwing.tabhost

import android.os.Bundle
import android.support.v7.app.AppCompatActivity

class HomeActivity : AppCompatActivity() {

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

Now, create xml file for this activity class in res/layout folder and name it activity_home.xml. 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:background="@android:color/holo_blue_dark"
	android:gravity="center"
	android:orientation="vertical">

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_marginBottom="20dp"
		android:text="@string/presented_by"
		android:textColor="@android:color/white"
		android:textSize="18sp"
		android:textStyle="bold"/>

	<ImageView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_marginBottom="20dp"
		android:contentDescription="@string/no_image"
		android:src="@mipmap/ic_launcher"/>

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="@string/home"
		android:textColor="@android:color/white"
		android:textSize="17sp"/>

</LinearLayout>

3.2 Create Second Page(Recent Page) Of TabHost

Create a new kotlin file, RecentActivity.kt, in main/java/com.tutorialwing.tabhost folder. Then, add below code into it.

package com.tutorialwing.tabhost

import android.os.Bundle
import android.support.v7.app.AppCompatActivity

class RecentActivity : AppCompatActivity() {

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

Now, create xml file for this activity class in res/layout folder and name it activity_recent.xml. 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:background="@android:color/holo_red_dark"
	android:gravity="center"
	android:orientation="vertical">

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_marginBottom="20dp"
		android:text="@string/presented_by"
		android:textColor="@android:color/white"
		android:textSize="18sp"
		android:textStyle="bold"/>

	<ImageView
		android:id="@+id/imageView"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_marginBottom="20dp"
		android:contentDescription="@string/no_image"
		android:src="@mipmap/ic_launcher"/>

	<TextView
		android:id="@+id/txtMain"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="@string/recent"
		android:textColor="@android:color/white"
		android:textSize="17sp"/>

</LinearLayout>

3.3 Create Third Page(Profile Page) Of TabHost

Create a new kotlin file, ProfileActivity.kt, in main/java/com.tutorialwing.tabhost folder. Then, add below code into it.

package com.tutorialwing.tabhost

import android.os.Bundle
import android.support.v7.app.AppCompatActivity

class ProfileActivity : AppCompatActivity() {

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

Now, create xml file for this activity class in res/layout folder and name it activity_profile.xml. 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:background="@android:color/holo_green_dark"
	android:gravity="center"
	android:orientation="vertical">

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_marginBottom="20dp"
		android:text="@string/presented_by"
		android:textColor="@android:color/white"
		android:textSize="18sp"
		android:textStyle="bold"/>

	<ImageView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_marginBottom="20dp"
		android:contentDescription="@string/no_image"
		android:src="@mipmap/ic_launcher"/>

	<TextView
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:text="@string/profile"
		android:textColor="@android:color/white"
		android:textSize="17sp"/>

</LinearLayout>

4. Use TabHost Widget in xml file

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

<?xml version="1.0" encoding="utf-8"?>
<TabHost
	android:id="@android:id/tabhost"
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent">

	<RelativeLayout
		android:layout_width="match_parent"
		android:layout_height="match_parent"
		android:orientation="vertical">

		<TabWidget
			android:id="@android:id/tabs"
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			android:layout_alignParentBottom="true">

		</TabWidget>

		<FrameLayout
			android:id="@android:id/tabcontent"
			android:layout_width="match_parent"
			android:layout_height="match_parent"
			android:layout_above="@android:id/tabs">

		</FrameLayout>

	</RelativeLayout>

</TabHost>

In activity_main.xml file, we have defined tabHost. Inside tabHost, we have tabWidget, that shows tab labels, and frameLayout that shows views for selected tab. In our case, we will show a separate activity for each page whenever any tab is selected. Now, we will access this tabHost in kotlin file and perform some operations on it.

5. Access TabHost in Kotlin file

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

package com.tutorialwing.tabhost

import android.app.TabActivity
import android.content.Intent
import android.os.Bundle
import android.widget.TabHost
import android.widget.Toast

class MainActivity : TabActivity() {

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

        val tabHost = findViewById<TabHost>(android.R.id.tabhost)
        if (tabHost != null) {
            addTab(tabHost, getString(R.string.home), getString(R.string.home), HomeActivity::class.java)
            addTab(tabHost, getString(R.string.recent), getString(R.string.recent), RecentActivity::class.java)
            addTab(tabHost, getString(R.string.profile), getString(R.string.profile), ProfileActivity::class.java)

            tabHost.currentTab = 1
            tabHost.setOnTabChangedListener { tabId -> Toast.makeText(applicationContext, tabId, Toast.LENGTH_SHORT).show() }
        }
    }

    private fun addTab(tabHost: TabHost, name: String, indicator: String, className: Class<*>) {
        val tabSpec = tabHost.newTabSpec(name)
        tabSpec.setIndicator(indicator)
        val intent = Intent(this, className)
        tabSpec.setContent(intent)
        tabHost.addTab(tabSpec)
    }
}

We have accessed tabHost in kotlin file ( i.e. in MainActivity.kt file). Then, we have added three tab to tabHost. After that, we have defined tab change listener that displays currently selected tab.

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

AndroidManifest.xml

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

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.tabhost"
		  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>
		<activity
			android:name=".RecentActivity"
			android:label="@string/recent">
		</activity>
		<activity
			android:name=".HomeActivity"
			android:label="@string/home">
		</activity>
		<activity
			android:name=".ProfileActivity"
			android:label="@string/profile">
		</activity>
	</application>

</manifest>

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

That’s end of tutorial on Android TabHost in Kotlin.

Support Us

If you like Tutorialwing and would like to contribute, you can email an article on any educational topic at tutorialwing@gmail.com. We would love to publish your article. See your article on Tutorialwing and help others with your knowledge. Follow Facebook, LinkedIn, Google+, Twitter, Youtube for latest updates.
Greetings!
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