Android Intent Handling Between Activities Using Kotlin | DigitalOcean (2023)

In this tutorial, we’ll be discussing Android Intents and implement them using Kotlin in our application.

What Will You Learn?

  • What are Intents?
  • Types Of Intents?
  • Using Intents Between Activities
  • Sending Data Using Android Intents
  • Using Parcelable and Serializable to pass objects
  • Creating shorthand intents

Android Intents

As the name says Intent is something that’s used to perform some action with respect to the flow of the android application. Intents can be used to:

  • Starting a new activity and passing some data.
  • Starting Fragments/Communicating between fragments.
  • Start/End service.
  • Launch activities from a broadcast receiver

In this tutorial, we’ll be looking mainly at intents to handle activities. An intent definition mainly consists of an instance of the current activity. We set the component name which can be: The fully qualified class name of the activity to be called. This type of Intent is an explicit intent. An action such as URL, phone number, location. It’ll display all the available applications of those types. This falls under the implicit intent category. In Kotlin, following is the way to create an activity.

(Video) PASS DATA BETWEEN ACTIVITY | INTENT | ANDROID | KOTLIN

val intent = Intent(this, OtherActivity::class.java)startActivity(intent)

startActivity would add OtherActivity on the activity stack and launch it. How does our Application, realise which activity is the first to be invoked? In the AndroidManifest.xml we set the intent filter with the action android.intent.action.MAIN and category android.intent.category.LAUNCHER on the first activity to be launched when our application opens. finish() is used to destroy an activity and remove it from the stack.

Intent Flags

Flags are like options that can be set on intents to customise the launch process. If you start the same activity everytime, a new instance would be created and added onto the activity stack To prevent this, you can use the flags: FLAG_ACTIVITY_SINGLE_TOP - If set, the activity will not be launched if it is already running at the top of the activity stack.

intent.flags = Intent.FLAG_ACTIVITY_SINGLE_TOP

Similarly using a flag FLAT_ACTIVITY_CLEAR_TOP would not launch another instance of the activity if it already exists. This flag would clear all the activities above the activity that’s called and set it on the top of the stack.

Passing Data Through Intents

To pass data onto the new activities we use key value pairs inside the function putExtra, putStringArrayListExtra etc. putExtra generally passes the basic types such as Int, Float, Char, Double, Boolean, String along withAndroid Intent Handling Between Activities Using Kotlin | DigitalOcean (1) IntArray… etc.

(Video) Kotlin Android Tutorial: Share Data between Activities using Explicit Intent #2.4

val intent = Intent(this, OtherActivity::class.java)intent.putExtra("keyString", "Androidly String data")

These Extras fields are under the hood wrapped into the Bundle object which ultimately holds all the data to be passed. To retrieve the data in the other activity, we need to use the extras property over the bundles. Retrieving Data in the new Activity

val bundle: Bundle? = intent.extrasval string: String? = intent.getString("keyString")val myArray: ArrayList<String>? = intent.getStringArrayList("myArray")

intent, extras are equivalent to getIntent(), getExtras() in Java. We’ve used a nullable type Bundle? to prevent NullPointerExceptions when not data exists. Similarly, for the data that’s fetched using the keys, we’ve used the nullable types to prevent NPE that can occur when the key is incorrect.

Using Parcelable and Serializable Data

Sometimes we need to pass a complete object from one activity to another. It’s not possible to do so unless we implement the Parcelable or Serializable interface. Difference between Parcelable and Serializable

  • Parcelable interface is a part of the Android SDK. Serializable is a standard interface of Java.
  • In Parcelable you need to set all of the data you need to pass in a Parcel object and also override the writeToParcel() methods etc. In serializable implementing the interface is sufficient to pass the data.
  • Parcelable is faster than Serializable.

Sending Parcelable Data

Kotlin comes up with some handy annotations to save us from overriding the writeToParcel() method to set the data on the Parcelable. Instead, we can use @Parcelize annotation as shown below:

(Video) 6 . Pass Data between Activities using intent (Kotlin) - Android Studio Tutorial

@Parcelizedata class Student( val name: String = "Anupam", val age: Int = 24) : Parcelable

Note: Currently in your build.gradle you must add the following code for the @Parcelize annotation to work:

android { androidExtensions { experimental = true }//......}

In your Activity you do:

val student = Student()val intent = Intent(this, OtherActivity::class.java)intent.putExtra("studentData", student)startActivity(intent)

Sending Serializable Data

data class Blog(val name: String = "Androidly", val year: Int = 2018) : Serializableval blog = Blog("a", 1)val intent = Intent(this, OtherActivity::class.java)intent.putExtra("blogData", blog as Serializable)startActivity(intent)

Let’s use over above knowledge in our Android Studio Project.

Project Structure

Android Intent Handling Between Activities Using Kotlin | DigitalOcean (2)

(Video) 8 Kotlin android Intent between Activities

Layout Code

The code for the activity_main.xml layout is given below:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" tools:context=".MainActivity"> <Button android:id="@+id/btnSimpleIntent" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="SIMPLE INTENT" /> <Button android:id="@+id/btnSimpleIntentAndData" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="SIMPLE INTENT WITH DATA" /> <Button android:id="@+id/btnParcelableIntent" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Parcelable Intent" /> <Button android:id="@+id/btnSerializableIntent" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Serializable Intent" /> <Button android:id="@+id/btnBrowserIntent" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Browser Intent" /> <Button android:id="@+id/btnMapsIntent" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Maps Intent" /> <Button android:id="@+id/btnGenericIntent" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Generic Intent" /></LinearLayout>

The code for the activity_other.xml layout is given below:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" tools:context=".MainActivity"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Intent Data goes here" /></LinearLayout>

Activity Code

The code for the MainActivity.kt class is given below:

package net.androidly.androidlyintentsimport android.app.Activityimport android.content.ComponentNameimport android.content.Contextimport android.content.Intentimport android.net.Uriimport android.support.v7.app.AppCompatActivityimport android.os.Bundleimport android.os.Parcelableimport android.view.Viewimport android.widget.Toastimport android.widget.Toast.LENGTH_LONGimport kotlinx.android.parcel.Parcelizeimport kotlinx.android.synthetic.main.activity_main.*import java.io.Serializable@Parcelizedata class Student( val name: String = "Anupam", val age: Int = 24) : Parcelabledata class Blog(val name: String = "Androidly", val year: Int = 2018) : Serializableclass MainActivity : AppCompatActivity(), View.OnClickListener { fun Context.gotoClass(targetType: Class<*>) = ComponentName(this, targetType) fun Context.startActivity(f: Intent.() -> Unit): Unit = Intent().apply(f).run(this::startActivity) inline fun <reified T : Activity> Context.start( noinline createIntent: Intent.() -> Unit = {} ) = startActivity { component = gotoClass(T::class.java) createIntent(this) } var arrayList = ArrayList<String>() override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) btnSimpleIntent.setOnClickListener(this) btnSimpleIntentAndData.setOnClickListener(this) btnParcelableIntent.setOnClickListener(this) btnSerializableIntent.setOnClickListener(this) btnBrowserIntent.setOnClickListener(this) btnMapsIntent.setOnClickListener(this) btnGenericIntent.setOnClickListener(this) arrayList.add("Androidly") arrayList.add("Android") arrayList.add("Intents") } override fun onClick(v: View?) { when (v?.id) { R.id.btnSimpleIntent -> { val intent = Intent(this, OtherActivity::class.java) startActivity(intent) } R.id.btnSimpleIntentAndData -> { val intent = Intent(this, OtherActivity::class.java) with(intent) { putExtra("keyString", "Androidly String data") putStringArrayListExtra("arrayList", arrayList) putExtra("keyBoolean", true) putExtra("keyFloat", 1.2f) } startActivity(intent) } R.id.btnParcelableIntent -> { val student = Student() val intent = Intent(this, OtherActivity::class.java) intent.putExtra("studentData", student) startActivity(intent) } R.id.btnSerializableIntent -> { val blog = Blog("a", 1) val intent = Intent(this, OtherActivity::class.java) intent.putExtra("blogData", blog as Serializable) startActivity(intent) } R.id.btnBrowserIntent -> { val url = "https://www.androidly.net" val uri = Uri.parse(url) val intent = Intent(Intent.ACTION_VIEW, uri) if (intent.resolveActivity(packageManager) != null) { startActivity(intent) } else { Toast.makeText(applicationContext, "No application found", LENGTH_LONG).show() } } R.id.btnMapsIntent -> { val loc = "12.9538477,77.3507442" val addressUri = Uri.parse("geo:0,0?q=" + loc) val intent = Intent(Intent.ACTION_VIEW, addressUri) if (intent.resolveActivity(packageManager) != null) { startActivity(intent) } else { Toast.makeText(applicationContext, "No application found", LENGTH_LONG).show() } } else -> start<OtherActivity> { putExtra("keyString", "Androidly Generic Intent") } } }}

In the above code, we’ve used Buttons for each type of Intent. We’ve used Kotlin’s with expression to prevent setting data over the intent object every time. Besides, we’ve created three different intents apart from the ones already discussed above. A browser intent is used to launch the url present in the intent in the browser app. It uses Intent(Intent.ACTION_VIEW, uri). A location intent is used to launch the lat,lng location in the maps application. Both of these are implicit intents. Lastly, we’ve used a generic intent in which we use the Kotlin’s extension functions and lambda expressions to create a shorthand function to launch an intent. For this we use the following functions:

(Video) Pass Data between Activities using intent (Kotlin) - Android Studio Tutorial

fun Context.gotoClass(targetType: Class<*>) = ComponentName(this, targetType) fun Context.startActivity(createIntent: Intent.() -> Unit): Unit = Intent().apply(createIntent).run(this::startActivity) inline fun <reified T : Activity> Context.start( noinline createIntent: Intent.() -> Unit = {} ) = startActivity { component = gotoClass(T::class.java) createIntent(this) }

startActivity is an exension function which looks for a higher order function as it’s parameter. Thanks to this, we can now launch intents in as few lines as: start<OtherActivity> The code for the OtherActivity.kt class is given below.

package net.androidly.androidlyintentsimport android.content.Contextimport android.support.v7.app.AppCompatActivityimport android.os.Bundleimport android.widget.Toastimport kotlinx.android.synthetic.main.activity_other.*class OtherActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_other) val bundle: Bundle? = intent.extras bundle?.let { bundle.apply { //Intent with data val string: String? = getString("keyString") textView.text = string val myArray: ArrayList<String>? = getStringArrayList("myArray") showToast(message = "MyArrayList size:${myArray?.size}") val arrayList: ArrayList<String>? = getStringArrayList("arrayList") showToast(message = "ArrayList size:${arrayList?.size}") val float: Float? = bundle.get("keyFloat") as Float? var boolean = bundle.get("boolean") as? Boolean showToast(message = "Float data is:$float") showToast(message = "Boolean data is:$boolean") boolean = bundle.get("keyBoolean") as? Boolean showToast(message = "Boolean correct key data is:$boolean") } bundle.apply { //Serializable Data val blog = getSerializable("blogData") as Blog? if (blog != null) { textView.text = "Blog name is ${blog?.name}. Year started: ${blog?.year}" } } bundle.apply { //Parcelable Data val student: Student? = getParcelable("studentData") if (student != null) { textView.text = "Name is ${student?.name}. Age: ${student?.age}" } } } } private fun showToast(context: Context = applicationContext, message: String, duration: Int = Toast.LENGTH_SHORT) { if (!message.contains("null")) Toast.makeText(context, message, duration).show() }}

We’ve used let and apply to handle nullable types and prevent doing bundle.field in every line. The output of the above application in action is given below: Android Intent Handling Between Activities Using Kotlin | DigitalOcean (3) This brings an end to this tutorial on Android intents in Kotlin. You can download the project from the link below.

AndroidlyIntents

FAQs

How do you pass data between activities in Android using Intent? ›

This example demonstrates how do I pass data between activities in android. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml.

How can I get Intent data from another activity? ›

For sending the value we will use intent. putExtra("key", Value); and during receive intent on another activity we will use intent. getStringExtra("key"); to get the intent data as String or use some other available method to get other types of data ( Integer , Boolean , etc.).

How do I transfer data from one activity to another in Kotlin? ›

Bundle in android is used to pass data from one activity to another, it takes data in key and value pairs.

How do you pass a custom object from one activity to another? ›

Pass custom object from one activity to another
  1. Create your java bean class.
  2. Make your class implement Parcelable.
  3. Use putExtra(String name, Parcelable value) to add it to the intent in ActivityA.
  4. Get your custom object in ActivityB using intent. getParcelableExtra(String nam)

How can I transfer data from one app to another in Android? ›

Android uses the action ACTION_SEND to send data from one activity to another, even across process boundaries. You need to specify the data and its type. The system automatically identifies the compatible activities that can receive the data and displays them to the user.

How do you link activities with intent? ›

Linking Activities Using Intents
  1. Start activities. A button click starts a new activity for text entry. Clicking Share opens an app that allows you to post a photo.
  2. Start services. Initiate downloading a file in the background.
  3. Deliver broadcasts.

Why is intent used to communicate between activities? ›

1) An intent is an abstract description of an operation to be performed. It can be used with startActivity to launch an Activity, broadcastIntent to send it to any interested BroadcastReceiver components, and startService(Intent) or bindService(Intent, ServiceConnection, int) to communicate with a background Service.

How pass URI to another activity? ›

To pass an image Uri to the next activity, you can just use setData() and getData() . There is no need to convert the Uri to anything.

Which component is used to share data between two applications? ›

Content provider is the android component, which has to be used if one application wants to share its data with other application.

How do you pass data class between fragments? ›

If you need to pass large amounts of data, consider using a ViewModel as described in Share data between fragments.
  1. Define destination arguments.
  2. Use Safe Args to pass data with type safety.
  3. Pass data between destinations with Bundle objects.
  4. Pass data to the start destination.
  5. ProGuard considerations.
  6. Additional resources.

How does Kotlin initialize intent? ›

Add the following code in the MainActivity.

The putExtra(key, value) method of Intent class send the data to the SecondActivity. kt class. The startActivity() method starts the Intent. Create another activity class named as SecondActivity.

How do you make toast with Kotlin? ›

Kotlin Android Toast
  1. Toast. makeText(applicationContext,"this is toast message",Toast. LENGTH_SHORT). ...
  2. val toast = Toast. makeText(applicationContext, "Hello Javatpoint", Toast. ...
  3. toast. show()
  4. val myToast = Toast. makeText(applicationContext,"toast message with gravity",Toast. ...
  5. myToast. setGravity(Gravity. ...
  6. myToast. show()

How can I pass value from one activity to another activity in Android without intent? ›

This example demonstrate about How to send data from one activity to another in Android without intent. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml.

How do you pass a model in intent Kotlin? ›

Pass Object from One Activity to Another using Serializable in...
  1. Implement Serializable in your Model Class. class UserModel() : Serializable { var id: String? = ...
  2. Pass Object From One Activity to Another in Intent. ...
  3. Receive Object in Second Activity From Intent.

How do you pass a class object in intent Kotlin? ›

7 Android Application Development with Kotlin - Passing Object with Intent

Who manages data sharing between applications? ›

Answer - C) A content provider is used to share information between Android applications. 11.

How is data sent from one application to another? ›

To move data from a field in an application to another field in a different application, you can use crossover domains. You can transfer data from a field in one application to a field in another application using crossover domains.

Can Android apps read other apps data? ›

There are three ways your app can receive data sent by another app: An Activity with a matching intent-filter tag in the manifest. One or more ChooserTarget objects returned by your ChooserTargetService. Sharing Shortcuts published by your app.

How can call activity from another activity in Android? ›

Start the Second Activity

To start an activity, call startActivity() and pass it your Intent . The system receives this call and starts an instance of the Activity specified by the Intent . Now you need to create the DisplayMessageActivity class in order for this to work.

How do you call the second activity from the first activity which intent is used? ›

To start an activity, use the method startActivity(intent) . This method is defined on the Context object which Activity extends. The following code demonstrates how you can start another activity via an intent. # Start the activity connect to the # specified class Intent i = new Intent(this, ActivityTwo.

What is the difference between activity and intent in Android? ›

An activity specifies a layout to represent it on screen. An intent is a system message. It can be broadcast around the system to notify other applications (or your own!) of an event, or it can be used to request that the system display a new activity.

How do you communicate between service and activity? ›

We already know that we can communicate with Service from activity just by using method startService() and passing Intent to the argument in the method, or either we can use bindService() to bind the service to the activity with argument Intent.

What are the benefits of intents in Android? ›

Using intents, you can adjust your app's user experience or ask other apps to perform common actions: taking photos, sending emails and SMS messages, and even displaying locations on maps and playing media. This course teaches you all you need to know to take advantage of this core piece of Android functionality.

How do I start an activity in another application? ›

If both application have the same signature (meaning that both APPS are yours and signed with the same key), you can call your other app activity as follows: Intent LaunchIntent = getActivity(). getPackageManager(). getLaunchIntentForPackage(CALC_PACKAGE_NAME); startActivity(LaunchIntent);

How do I send a picture with intent? ›

You can send content by invoking an implicit intent with ACTION_SEND .
  1. Sending HTML. Intent sharingIntent = new Intent(Intent. ...
  2. Sending Images. To send images or binary data: final Intent shareIntent = new Intent(Intent. ...
  3. Sending Links. ...
  4. Sharing Multiple Types. ...
  5. Share in Facebook. ...
  6. Sharing Files with API 24 or higher.

What is the use of intent CreateChooser () method? ›

Overloads
CreateChooser(Intent, ICharSequence)Convenience function for creating a #ACTION_CHOOSER Intent.
CreateChooser(Intent, ICharSequence, IntentSender)Convenience function for creating a #ACTION_CHOOSER Intent.
CreateChooser(Intent, String, IntentSender)Convenience function for creating a #ACTION_CHOOSER Intent.
1 more row

How do you pass data between two unrelated components? ›

We will use a shared service, subject variable, and subscription variable to share data between unrelated components. We have added a subject variable inside the service. We will emit the data from one component using this subject variable. We can emit any type of data from subject variable.

How do I transfer data from one API to another? ›

Push data from one API to another API
  1. GET data from Timing App's API (DONE, testing only)
  2. POST that data into my invoicing app Wave to create an invoice. (DONE, testing only)
26 Feb 2021

How do I transfer data from one Web application to another? ›

You can do one of the following things to pass information from one webapp to another: pass data as request parameter. send data as cookie without path restriction. use cross context dispatching.

How do you pass data between fragments Kotlin? ›

Step 1 − Create a new project in Android Studio, go to File ⇉ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml. Step 3 − Create two FragmentActivity and add the codes which are given below.

How do we extract the data sent by one fragment? ›

To pass data from one fragment to another in android we simply make use of Bundle . In this example I am sending three String from MainActivityFragment(Fragment) to SecondFragment(Fragment) with the help of Bundle.

How do you pass data from second fragment to first fragment? ›

How to send data from one fragment to another fragment android studio ...

What does :: means in Kotlin? ›

Android API only accepts Java classes, that's why you need to pass a Java class. IntroAndLang::class returns a KClass (a Kotlin class), then . java returns the Java class. Note that all Kotlin classes are compiled to Java classes ( . class binaries) in the end.

How do you use Kotlin handler? ›

You can use Handler to add a Runnable object or messages to the Looper to execute the code on the thread associated with the Looper. Android associates each Handler instance with a single thread and that thread's message queue. Whenever you create a new Handler instance, it is tied up to a single Looper .

What is the difference between toast and snackbar? ›

Snackbars contain a single line of text directly related to the operation performed. They may contain a text action, but no icons. Toasts (Android only) are primarily used for system messaging. They also display at the bottom of the screen, but may not be swiped off-screen.

Why is it called a toast message? ›

Mobile OS developers such as Android and iOS wanted to provide notifications to the users. The thing popped up from the bottom of the screen, a motion which was very similar of a toast popping up from the toaster when ready — so toast it was called.

How do I show a toast at a specific time? ›

In general, a Toast can be displayed for either 2 seconds (Toast. LENGTH_SHORT) or 3.5 seconds (Toast. LENGTH_LONG). In this article, we will show you how you could display Toast for longer or shorter in Android.

How do you pass data from one activity to another activity in Kotlin? ›

This example demonstrates how to pass data between activities using Kotlin. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml.

How do I move from one activity to another in Kotlin? ›

To start new (another) Android Activity from an Activity, follow these steps.
  1. In the current Activity, create an Intent with current Activity's context and Next Activity Class passed as arguments. val intent = Intent(this, AnotherActivity::class.java)
  2. Call startActivity() method with intent passed as argument.

How pass data from one activity to another activity in Android Studio? ›

Using Intents

This example demonstrate about How to send data from one activity to another in Android using intent. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main. xml.

How do I pass a list in intent? ›

pass list to intent in android java
  1. First, make the class of the list implement Serializable.
  2. public class Object implements Serializable{}
  3. Then you can just cast the list to (Serializable). Like so:
  4. List<Object> list = new ArrayList<Object>();
  5. myIntent. ...
  6. And to retrieve the list you do:

What is a sticky intent in Android? ›

Sticky Intent is also a type of Intent which allows communication between a function and a service sendStickyBroadcast(), performs a sendBroadcast(Intent) known as sticky, the Intent you are sending stays around after the broadcast is complete, so that others can quickly retrieve that data through the return value of ...

How do you pass a list on Kotlin? ›

Typically it is complicated to pass a list of objects between Activities. But lately in Kotlin all you have to do is simple. First, in your data class you implement Serializable. Then in your source Activity, you add it to your bundle and cast it as Serializable.

How do you send an object from one activity to another activity? ›

Pass custom object from one activity to another
  1. Create your java bean class.
  2. Make your class implement Parcelable.
  3. Use putExtra(String name, Parcelable value) to add it to the intent in ActivityA.
  4. Get your custom object in ActivityB using intent. getParcelableExtra(String nam)

What is the difference between Serializable and Parcelable? ›

Unlike Serializable, in Parcelable reflection won't be used so it is faster and has better performance. Android Parcelabe is not made to save objects into the files, so if you want to save an object in the file you must use Serializable.

How do you implement serializable in Kotlin? ›

Before starting, you'll need to configure your build script so that you can use Kotlin serialization tools in your project:
  1. Apply the Kotlin serialization Gradle plugin org. jetbrains. kotlin. plugin. ...
  2. Add the JSON serialization library dependency: org.jetbrains.kotlinx:kotlinx-serialization-json:1.4.0. Kotlin. Groovy.
6 Sept 2022

Which method of the Intent class allows you to pass information to the target? ›

putExtra method is used.

How pass JSON object from one activity to another in Android? ›

i. PutExtra("json1", json); StartActivity(i); and the destination activity is savedInstanceState = new Bundle(); savedInstanceState = Intent. Extras; var obj1 = savedInstanceState.

How can call activity from another activity in Android? ›

Start the Second Activity

To start an activity, call startActivity() and pass it your Intent . The system receives this call and starts an instance of the Activity specified by the Intent . Now you need to create the DisplayMessageActivity class in order for this to work.

What is the purpose of super onCreate () in Android? ›

Q 9 – What is the purpose of super. onCreate() in android? The super. onCreate() will create the graphical window for subclasses and place at onCreate() method.

Why is intent used to communicate between activities? ›

1) An intent is an abstract description of an operation to be performed. It can be used with startActivity to launch an Activity, broadcastIntent to send it to any interested BroadcastReceiver components, and startService(Intent) or bindService(Intent, ServiceConnection, int) to communicate with a background Service.

How does kotlin initialize intent? ›

Add the following code in the MainActivity.

The putExtra(key, value) method of Intent class send the data to the SecondActivity. kt class. The startActivity() method starts the Intent. Create another activity class named as SecondActivity.

How do I parse JSON array in Kotlin? ›

You can use JSON to Kotlin Data class converter plugin in Android Studio for JSON mapping to POJO classes (kotlin data class). This plugin will annotate your Kotlin data class according to JSON. Then you can use GSON converter to convert JSON to Kotlin. If you want to parse json manually.

How do you pass a class object in intent Kotlin? ›

7 Android Application Development with Kotlin - Passing Object with Intent

What is JSON parsing in Android? ›

JSON stands for JavaScript Object Notation.It is an independent data exchange format and is the best alternative for XML. This chapter explains how to parse the JSON file and extract necessary information from it. Android provides four different classes to manipulate JSON data.

How can you start another activity from the current activity? ›

There are 3 different ways to start a new activity in Android, and they all use the Intent class; Intent | Android Developers.
  1. Using the onClick attribute of the Button. ( Beginner)
  2. Assigning an OnClickListener() via an anonymous class. ( Intermediate)
  3. Activity wide interface method using the switch statement. (

What happens to activity when device is rotated? ›

On rotation of screen, The Activity is Destroyed. The Activity is Recreated fresh in requested orientation.

What's the difference between onCreate () and onStart ()? ›

Android App Development for Beginners

onCreate() is called when the when the activity is first created. onStart() is called when the activity is becoming visible to the user.

Can we create activity without UI in Android? ›

Explanation. Generally, every activity is having its UI(Layout). But if a developer wants to create an activity without UI, he can do it.

Can a class be immutable in Android? ›

Immutable can be used to mark class as producing immutable instances. The immutability of the class is not validated and is a promise by the type that all publicly accessible properties and fields will not change after the instance is constructed.

Videos

1. Pass Data between Activities using Intents | Kotlin | Android Studio
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2. Pass Data between Activities using Intent (Kotlin) - Android Studio
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3. INTENTS AND STARTING ACTIVITIES - Android Fundamentals
(Philipp Lackner)
4. how to pass data from one activity to another in android kotlin | kotlin tutorial for beginners
(Coding with Dev)
5. Android studio tutorials - Lesson 4 : transfer data between activities using Intent [ kotlin ]
(Android Studio Tutorials)
6. 1- Android Kotlin. Pass Data between Activities using intent Urdu/Hindi.
(Sheroz Kotlin)
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Author: Otha Schamberger

Last Updated: 02/25/2023

Views: 6280

Rating: 4.4 / 5 (55 voted)

Reviews: 86% of readers found this page helpful

Author information

Name: Otha Schamberger

Birthday: 1999-08-15

Address: Suite 490 606 Hammes Ferry, Carterhaven, IL 62290

Phone: +8557035444877

Job: Forward IT Agent

Hobby: Fishing, Flying, Jewelry making, Digital arts, Sand art, Parkour, tabletop games

Introduction: My name is Otha Schamberger, I am a vast, good, healthy, cheerful, energetic, gorgeous, magnificent person who loves writing and wants to share my knowledge and understanding with you.