How to make a app for Android: from idea to publication on Google Play

Creating your own application for Android is a task that seems difficult only at first glance. In fact, thanks to modern tools and extensive documentation, even a beginner without deep programming knowledge can develop a app for this platform. The main thing is to choose the right approach, understand the main stages and avoid typical mistakes that slow down most beginning developers.

In this article we will analyze the entire process from idea to publication in Google Play: from choosing a programming language and development environment to optimizing the code and passing moderation. You will learn what tools to use in 2026, how to test an application on different devices, and what requirements the Google requirements for new apps. And if you've never written code, don't worry: we'll also look at options for creating applications without programming.

1. Choosing an approach: with or without code?

Before starting development, decide whether you want to write code yourself or use application designers. Both options have pros and cons, and the choice depends on your goals, budget and technical skills.

If you plan to create a simple application (for example, a company business card, calculator or news aggregator), you can do without programming. For this, there are platforms like Appy Pie, Thunkable or Adalo. They offer drag-and-drop interfaces, ready-made templates, and integration with popular services. However, such solutions have limitations:

• 🔄 Limited customization - you depend on the functions that the platform provides.
• 💰 Subscription or commission - most services charge a fee for publication or monetization.
• 📱 Performance - ready-made applications often work slower than native ones.

If you need an application with unique functionality (for example, a game, instant messenger or application for IoTdevices), you cannot do without programming. In this case, you will need to study Java, Kotlin (recommended Google language for Android) or cross-platform frameworks like Flutter or React Native.

2. Installing the necessary tools

If you have chosen the programming path, the first thing you need to do is prepare a working environment. The main tool for development under Android — Android Studio, the official IDE from Google. It is free, regularly updated and includes everything you need:

• 🛠️ Code editor with syntax highlighting and autocompletion.
• 📱 Built-in emulator for testing on virtual devices.
• 🔧 Tools for debugging, profiling and optimization.
• 📦 Package manager Gradle for dependency management.

Download Android Studio can be from the official website developer.android.com. Make sure your computer meets the system requirements:

Parameter	Minimum requirements	Recommended requirements
Operating system	Windows 8/10 (64-bit), macOS 10.14+, Linux (GNU C Library 2.31+)	Windows 11, macOS 13+, Ubuntu 22.04 LTS
RAM	4 GB	16 GB (for the emulator and heavy projects)
Disk space	2 GB for IDE + 1.5 GB for Android SDK	SSD with 20+ GB of free space
Resolution screen	1280×800	1920×1080 or higher

After installation Android Studio you need to download Android SDK (Software Development Kit) - a set of development tools. This can be done directly in the IDE via SDK Manager. Please note the versions API: for compatibility with most devices, it is recommended to support API 24 (Android 7.0) and higher, but test on API 34 (Android 14).

⚠️ Attention: If you are developing under Android 14+, please note that Google tightened the requirements for permissions and security. For example, it is now mandatory to use targetSdkVersion 34 and adapt the application to the new rules for working with files and notifications.

3. Creating the first project and application structure

After configuration Android Studio you can create the first project. When choosing a template, it is better for a beginner to start with Empty Activity —this is the minimum required set of files to launch the application. The project structure in Android Studio includes several key folders:

• 📁 app/src/main/java/ —the source code for Java/Kotlin.
• 📁 app/src/main/res/ is stored here—resources: layouts (layout), images (drawable), strings (values).
• 📄 app/build.gradle — build configuration and dependencies.
• 📄 AndroidManifest.xml — manifest with application metadata (permissions, activities, etc.).

The main file you will work with is MainActivity.kt (or MainActivity.java). This is the entry point to the application. For example, the simplest app on Kotlinthat displays the text "Hello, Android!" looks like this:

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

val textView = findViewById(R.id.helloText)
textView.text = "Hello, Android!"
}
}

And the corresponding layout (activity_main.xml) can be like this:

<?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">

<TextView
android:id="@+id/helloText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Default Text"/>
</LinearLayout>

After writing the code, you can run the application on an emulator or a real device. To do this, connect your smartphone via USB (don't forget to enable Developer Mode i USB Debugging in your phone settings) or create a virtual device via AVD Manager.

4. Interface design: from layouts to animations

The application interface determines how convenient it will be to use. In Android to create the UI, XMLlayouts or app code are used Kotlin/Java. Modern applications are built on the basis of Material Design 3 - a design system from Google, which offers ready-made components, animations and design recommendations.

The main interface elements that are useful in most projects:

• 📱 ConstraintLayout - a flexible container for placing elements (replaced outdated RelativeLayout).
• 🔘 Button, TextView, EditText —basic elements for entering and displaying data.
• 📋 RecyclerView —optimized list for displaying large amounts of data.
• 🎨 MaterialButton, MaterialCardView —styled components from the library Material Components.

Example of a layout with a button and a text field:

<?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">

<com.google.android.material.textfield.TextInputLayout
android:id="@+id/textInputLayout"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:layout_margin="16dp">

<com.google.android.material.textfield.TextInputEditText
android:id="@+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter text"/>
</com.google.android.material.textfield.TextInputLayout>

<com.google.android.material.button.MaterialButton
android:id="@+id/submitButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Submit"
app:layout_constraintTop_toBottomOf="@id/textInputLayout"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>

To add animations, use:

• 🎞️ ObjectAnimator — to animate object properties (for example, changes in color or position).
• 🔄 TransitionManager — for smooth transitions between layout states.
• 🖼️ Lottie —a library for playing vector animations in the format JSON.

⚠️ Attention: When developing the interface, consider adaptability. Your application must be displayed correctly on screens of different sizes - from smartphones to tablets. Use tool 4" smartphones up to 12" tablets. To do this use dp (density-independent pixels) instead px, and also test layouts on various configurations in Android Studio Layout Editor.

5. Application logic: working with data and API

Most applications interact with data, be it local storage or a remote server. Let's look at the main ways of working with information in Android.

Local storage:

• 📝 SharedPreferences — for saving simple key-value pairs (for example, user settings).
• 🗃️ Room Database — an add-on over SQLite, simplifying work with databases.
• 📄 Internal/External Storage — for saving files (images, videos, etc.).

An example of saving data using SharedPreferences:

// Saving
val sharedPref = getSharedPreferences("myPrefs", Context.MODE_PRIVATE)
with(sharedPref.edit()) {
putString("username", "user123")
putBoolean("isLoggedIn", true)
apply()
}

// Reading
val username = sharedPref.getString("username", "default")
val isLoggedIn = sharedPref.getBoolean("isLoggedIn", false)

Working with the network: To interact with API use the library Retrofit. It simplifies sending HTTPrequests and processing responses. Example of a request to a public API:

interface ApiService {
@GET("users/{id}")
suspend fun getUser(@Path("id") userId: Int): Response
}

val retrofit = Retrofit.Builder()
.baseUrl("https://api.example.com/")
.addConverterFactory(GsonConverterFactory.create())
.build()

val service = retrofit.create(ApiService::class.java)
val user = service.getUser(1) // Asynchronous request

Don't forget about multithreading: network requests and heavy operations should be performed in a background thread. To do this, use:

• 🔄 Coroutines (recommended Google method for Kotlin).
• 🧵 RxJava —a reactive approach for working with data streams.
• 👷 WorkManager —for deferred or periodic tasks.

⚠️ Attention: With Android 9 (API 28) by default, connections without HTTP- connections without HTTPSare prohibited. If your API does not support encryption, you will have to manually add an exception to AndroidManifest.xml or configure network_security_config. However, this is not recommended for security reasons.

6. Testing and debugging

Testing is a mandatory step before publishing.

• 📱 Various. devices (with different screen resolutions and versions Android).
• 🌐 Different languages and regional settings.
• 🔄 Different usage scenarios (for example, with poor Internet or low battery).

In Android Studio there are built-in tools for testing:

Tool	Purpose	Usage example
Espresso	UI testing	Checking that the button opens the desired screen after pressing.
JUnit	Unit tests	Checking the correct operation of the calculation function.
Android Test Orchestrator	Isolation of tests	Running each test in a separate process to avoid conflicts.
Firebase Test Lab	Cloud testing	Testing an application on real devices in Google Cloud.

Example of a simple test with Espresso:

@RunWith(AndroidJUnit4::class)
class MainActivityTest {
@get:Rule
val activityRule = ActivityScenarioRule(MainActivity::class.java)

@Test
fun testButtonClick() {
onView(withId(R.id.submitButton)).perform(click())
onView(withId(R.id.resultText)).check(matches(withText("Success!")))
}
}

To find errors, use:

• 🐞 Logcat — log of system messages and errors.
• 🔍 Debugger — step-by-step code execution.
• 📊 Profile CPU/Memory — performance analysis.

More than 30% of failures in Google Play occur due to crashes on specific devices. Always test the application on at least 3-5 different smartphones with different versions of Android and hardware.

7. Preparing for publication on Google Play

Before publishing the application in Google Play you must complete several mandatory steps:

1. 🆔 Create an account developer in Google Play Console (one-time fee $25).
2. 📝 Prepare metadata: title, description, screenshots, video, icon (size 512×512).
3. 🔐 Generate signed APK/AAB via Build → Generate Signed Bundle/APK.
4. 📋 Fill out the privacy questionnaire (required c Android 13).
5. 🌍 Indicate the target audience and content rating.

Pay special attention privacy requirementsFrom 2023 Google requires a declaration of what data the application collects and how it is used. Example of filling:

<manifest>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>


<application
android:dataExtractionRules="@xml/data_extraction_rules"
android:requestLegacyExternalStorage="false">
</application>
</manifest>

Also prepare privacy_policy.html a page with a privacy policy (it can be placed on GitHub Pages or any hosting). Without this, the application will not pass moderation.

⚠️ Attention: C August 1, 2026 Google Play requires that all new applications be published in format .aab (Android App Bundle), and not .apk. This allows you to optimize the size of the downloaded file for different devices.

8. Publication and promotion of the application

After uploading the .aabfile to Google Play Console the application will undergo moderation, which usually takes 1-3 days. After approval, you will be able to publish it in one of three modes:

• 🌐 Production —a full release for all users.
• 🧪 Open testing —available to everyone, but marked as a "test version."
• 🔒 Closed testing —only for specified testers (by email).

To successfully promote the application:

• 📈 ASO (App Store Optimization) —optimize the title, description and keywords for search.
• 📢 Social networks — create pages in Instagram, TikTok or Telegram to communicate with users.
• 💰 Monetization —select a model: paid application, subscriptions, advertising (AdMob) or internal purchases.
• 📊 Analytics —connect Firebase Analytics or AppsFlyer to track user installations and behavior.

Example integration AdMob to display banner advertising:

// In build.gradle (Module: app)
implementation 'com.google.android.gms:play-services-ads:23.0.0'

// In MainActivity.kt
lateinit var mAdView: AdView

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

MobileAds.initialize(this) {}
mAdView = findViewById(R.id.adView)
val adRequest = AdRequest.Builder().build()
mAdView.loadAd(adRequest)
}

Don't forget to update the application: fix bugs, add new features and adapt to changes in Android. Regular updates increase user loyalty and improve search rankings.

What to do if the application is rejected?

The most common reasons for rejection: violation of the privacy policy (35%), incorrect use of permissions (25%), low quality content (20%). The letter from Google will indicate a specific reason - correct it and send the application for re-moderation.

FAQ: Frequently asked questions about Android development

❓ Do you need to know Java to develop for Android?

No, Kotlin is an officially recommended language for Android, and its syntax is simpler than that of Java. However, knowledge Java will help to understand old projects and some low-level mechanisms. It is better for beginners to choose Kotlin.

❓ How much does it cost to publish an application on Google Play?

Registration of a developer account costs $25 (one-time). Further expenses depend on your tasks: hosting for the backend, design work, advertising, etc. The publication of the application itself is free, but Google takes 30% commissions from sales and subscriptions.

❓ Is it possible to develop Android applications on Mac or Linux?

Yes, Android Studio officially supports macOS (including Apple Silicon) and Linux (distributions based on Debian/Ubuntu). The only limitation is that the emulator Android on Linux requires configuration KVM to speed up.

❓ How to protect the application from hacking and piracy?

Complete protection does not exist, but you can complicate the task attackers:

• Use ProGuard or R8 to obfuscate the code.
• Check licenses through Google Play Licensing.
• Store critical data (for example, API keys) on the server, not in code.
• Use Firebase App Check to protect against bots.

However, remember: any application can be decompiled, so do not store sensitive information in it.

❓ What alternatives to Google Play exist for publishing?

In addition to Google Play, you can publish applications on:

• 🌍 Amazon Appstore (especially relevant for Fire OS devices).
• 🇨🇳 Huawei AppGallery (for the Chinese market and devices Huawei).
• 📱 Samsung Galaxy Store (for devices Samsung).
• 💻 APKMirror, APKPure - hosting for direct downloads .apk.

Each store has its own application requirements and audience, so choose a platform based on your target users.