Play Store submission in Android Kotlin - Deep Dive

Overview - Play Store submission

What is it?

Play Store submission is the process of preparing and sending your Android app to Google Play so users can download and install it. It involves creating a developer account, preparing your app package, adding details like descriptions and screenshots, and finally publishing it. This process makes your app available to millions of Android users worldwide.

Why it matters

Without submitting your app to the Play Store, users cannot easily find or install it on their devices. The Play Store provides a trusted platform that handles app distribution, updates, and security checks. It also helps you reach a wide audience and gain user feedback, which is essential for your app's success.

Where it fits

Before submitting, you should know how to build and test Android apps using Kotlin and Android Studio. After submission, you will learn about app updates, user analytics, and marketing strategies to grow your app's user base.

Mental Model

Core Idea

Submitting to the Play Store is like opening a shop in a busy marketplace where you prepare your product, display it attractively, and follow rules so customers trust and buy it.

Think of it like...

Imagine you baked a cake and want to sell it at a big fair. You need to package it nicely, write a label with ingredients, set a price, and get permission from the fair organizers. Only then can people see and buy your cake.

┌───────────────────────────────┐
│ 1. Developer Account Setup     │
├───────────────────────────────┤
│ 2. App Preparation            │
│   - Build APK/AAB             │
│   - Sign App                 │
├───────────────────────────────┤
│ 3. Store Listing Creation     │
│   - Description, Screenshots  │
│   - Content Rating            │
├───────────────────────────────┤
│ 4. Upload & Submit            │
│   - Upload APK/AAB            │
│   - Review & Publish          │
└───────────────────────────────┘

Build-Up - 7 Steps

1

Foundation

Create Google Play Developer Account

Concept: You need a developer account to submit apps to the Play Store.

Go to the Google Play Console website and sign up using your Google account. Pay a one-time registration fee. This account lets you manage your apps, see user feedback, and publish updates.

Result

You have access to the Play Console dashboard where you can start submitting your app.

Understanding that the developer account is your gateway to the Play Store helps you see why it’s the first step and why it requires verification and payment.

2

Foundation

Prepare Your App Package (APK or AAB)

Concept: Your app must be packaged correctly and signed before submission.

In Android Studio, build a release version of your app as an APK or Android App Bundle (AAB). Then, sign it with a secure key to prove it’s your app. This ensures the app is ready for distribution and updates.

Result

You get a signed APK or AAB file ready to upload to the Play Console.

Knowing that signing your app protects users and allows future updates prevents common security mistakes.

3

Intermediate

Create Store Listing with Details

🤔Before reading on: Do you think the Play Store listing only needs the app name and icon? Commit to yes or no.

Concept: You must provide detailed information about your app to attract users and comply with policies.

In the Play Console, fill in your app’s title, short and full description, add screenshots, a feature graphic, and select the app category. You also set the content rating and privacy policy URL here.

Result

Your app listing looks professional and helps users understand what your app does.

Understanding that a good store listing influences downloads and trust shows why this step is crucial for success.

4

Intermediate

Set App Pricing and Distribution

🤔Before reading on: Can you submit a paid app without setting a price? Commit to yes or no.

Concept: You decide where your app is available and whether it’s free or paid.

Choose the countries where your app will be available. Set the price if it’s paid or mark it free. You can also opt into programs like Google Play Pass or select device types.

Result

Your app is configured to reach the right audience and revenue model.

Knowing how pricing and distribution affect your app’s reach helps you plan your launch strategy.

5

Intermediate

Upload App and Submit for Review

Concept: You upload your signed app package and send it to Google for approval.

In the Play Console, upload your APK or AAB file. Review all details and submit your app. Google runs automated checks and may manually review your app for policy compliance.

Result

Your app enters the review queue and will be published once approved.

Understanding the review process helps you prepare for possible delays and rejections.

6

Advanced

Manage App Releases and Updates

🤔Before reading on: Do you think you must create a new developer account for every app update? Commit to yes or no.

Concept: You can release updates to your app through the Play Console without resubmitting everything from scratch.

Use the Play Console to create new release tracks like internal testing, beta, or production. Upload updated app bundles, manage staged rollouts, and monitor crash reports and user feedback.

Result

You can safely improve your app and fix bugs while controlling who gets updates first.

Knowing how release tracks and staged rollouts work prevents bad updates from affecting all users.

7

Expert

Optimize Submission with Advanced Play Console Features

🤔Before reading on: Is it possible to test your app with real users before full release? Commit to yes or no.

Concept: The Play Console offers tools like pre-launch reports, device catalog, and user experiments to improve your app’s quality and performance.

Use pre-launch reports to automatically test your app on many devices. Manage device exclusions to avoid crashes. Run A/B tests on store listings to find the best descriptions and graphics. Use Play App Signing for secure key management.

Result

Your app is more stable, better presented, and more likely to succeed in the market.

Understanding these advanced tools helps you act like a professional developer and avoid common pitfalls that hurt app ratings.

Under the Hood

When you submit your app, the Play Console processes your signed APK or AAB, verifying its integrity and compatibility. Google runs automated security scans and policy checks. The app bundle format allows Google to generate optimized APKs for different devices, reducing app size. The review system balances automation and human checks to protect users while enabling fast publishing.

Why designed this way?

Google designed the Play Store submission process to ensure apps are safe, reliable, and user-friendly. The signing system prevents tampering and ensures updates come from the original developer. The review process protects users from harmful or low-quality apps. Using app bundles optimizes delivery for diverse Android devices, improving user experience.

┌───────────────┐      ┌───────────────┐      ┌───────────────┐
│ Developer     │      │ Google Play   │      │ User Device   │
│ Uploads App   │─────▶│ Console       │─────▶│ Downloads    │
│ (Signed APK)  │      │ Processes &   │      │ Optimized APK │
│               │      │ Reviews App   │      │ Installs App  │
└───────────────┘      └───────────────┘      └───────────────┘

Myth Busters - 4 Common Misconceptions

Quick: Do you think you can submit an app without signing it? Commit to yes or no.

Common Belief: Many believe that signing the app is optional or only needed for security experts.

Reality: Signing is mandatory for all apps on the Play Store to verify the developer's identity and enable updates.

Why it matters: Submitting unsigned apps will be rejected, delaying your launch and causing confusion.

Quick: Do you think once your app is published, you cannot change its listing details? Commit to yes or no.

Common Belief: Some think the app description, screenshots, or pricing are fixed after publishing.

Reality: You can update store listing details anytime without resubmitting the app package.

Why it matters: Believing otherwise may cause unnecessary resubmissions and slow down marketing efforts.

Quick: Do you think the Play Store review always takes days or weeks? Commit to yes or no.

Common Belief: Many expect long delays for every app submission.

Reality: Automated reviews often take hours or less, though manual reviews can take longer for new or complex apps.

Why it matters: Knowing this helps you plan your release schedule realistically and avoid panic.

Quick: Do you think you must pay a fee for every app you submit? Commit to yes or no.

Common Belief: Some believe each app submission requires a new payment.

Reality: The Google Play Developer account requires a one-time fee; after that, you can submit unlimited apps.

Why it matters: Misunderstanding this can discourage developers from publishing multiple apps.

Expert Zone

1

App signing keys are critical; losing your upload key can lock you out of updating your app, so Google offers key reset options but with strict processes.

2

Using Android App Bundles instead of APKs allows Google Play to deliver optimized versions per device, reducing app size and improving install rates.

3

Staged rollouts let you release updates to a small percentage of users first, catching issues early without affecting everyone.

When NOT to use

Play Store submission is not suitable for private or internal apps meant only for a small group; in such cases, use internal app sharing, enterprise app stores, or direct APK distribution.

Production Patterns

Professional developers use CI/CD pipelines to automate building, signing, and uploading apps to the Play Console. They also monitor pre-launch reports and user feedback to quickly fix issues and improve app quality.

Connections

Continuous Integration/Continuous Deployment (CI/CD)

Builds-on

Understanding Play Store submission helps you automate app releases using CI/CD tools, making updates faster and less error-prone.

Digital Certificates and Cryptography

Shares principles

App signing uses cryptographic keys similar to website SSL certificates, ensuring authenticity and trust.

Retail Product Launch

Analogous process

Submitting an app to the Play Store is like launching a product in a store, involving preparation, packaging, marketing, and quality checks.

Common Pitfalls

#1 Uploading an unsigned APK causes rejection.

Wrong approach:

./gradlew assembleRelease
# Upload unsigned APK directly

Correct approach:

./gradlew assembleRelease
# Then sign APK with keystore before upload

Root cause:

Not understanding that signing is mandatory for app authenticity and updates.

#2 Using debug keys for signing instead of release keys.

Wrong approach:

Signing app with debug.keystore for release build

Correct approach:

Signing app with your own release keystore configured in build.gradle

Root cause:

Confusing debug builds with release builds and their signing requirements.

#3 Skipping content rating leads to app suspension.

Wrong approach:

Submitting app without filling content rating questionnaire

Correct approach:

Completing content rating questionnaire accurately before publishing

Root cause:

Ignoring Play Store policies and automated checks.

Key Takeaways

Submitting your app to the Play Store requires a developer account, a signed app package, and a detailed store listing.

Signing your app is essential for security and future updates; unsigned or debug-signed apps will be rejected.

The Play Console offers tools to manage releases, test apps, and optimize listings for better user reach.

Understanding the review and publishing process helps you plan launches and avoid common delays or rejections.

Advanced features like staged rollouts and pre-launch reports improve app quality and user experience in production.

Practice

1. Why is it important to sign your Android app before submitting it to the Play Store?

easy

A. It verifies the app's author and ensures updates come from the same source.

B. It makes the app run faster on all devices.

C. It automatically translates the app to multiple languages.

D. It removes all bugs from the app.

Solution

1. Step 1: Understand app signing purpose

   Signing confirms the identity of the developer and secures app updates.

2. Step 2: Recognize Play Store requirements

   Google Play requires signed apps to ensure trust and security for users.

3. Final Answer:

   It verifies the app's author and ensures updates come from the same source. -> Option A

4. Quick Check:

   App signing = Verify author and secure updates [OK]

Hint: Signing proves app ownership and update safety [OK]

Common Mistakes:

• Thinking signing improves app speed
• Believing signing translates the app
• Assuming signing fixes bugs automatically

2. Which of the following is the correct way to specify the version code in your Android app's build.gradle file before Play Store submission?

easy

A. versionCode = 1

B. versionCode = "1.0"

C. versionCode = true

D. versionCode = 1.0

Solution

1. Step 1: Identify versionCode data type

   versionCode must be an integer, not a string or decimal.

2. Step 2: Check each option's type

   versionCode = 1 uses an integer 1, which is correct; others use string, boolean, or float.

3. Final Answer:

   versionCode = 1 -> Option A

4. Quick Check:

   versionCode = integer [OK]

Hint: versionCode must be an integer number [OK]

Common Mistakes:

• Using quotes around versionCode value
• Using decimal numbers for versionCode
• Assigning boolean values to versionCode

3. Given this snippet in your build.gradle file, what will happen when you try to upload the app to the Play Store?

android {
    defaultConfig {
        applicationId "com.example.app"
        minSdkVersion 21
        targetSdkVersion 33
        versionCode 2
        versionName "1.1"
    }
}

medium

A. The upload will fail because applicationId is missing.

B. The app will upload successfully with version 1.1 and code 2.

C. The app will upload but with minSdkVersion ignored.

D. The upload will fail because versionCode must be a string.

Solution

1. Step 1: Check versionCode and versionName types

   versionCode is integer 2 and versionName is string "1.1" which is correct.

2. Step 2: Verify required fields

   applicationId, minSdkVersion, targetSdkVersion are all present and valid.

3. Final Answer:

   The app will upload successfully with version 1.1 and code 2. -> Option B

4. Quick Check:

   Valid config = Successful upload [OK]

Hint: Check types and required fields before upload [OK]

Common Mistakes:

• Confusing versionCode type as string
• Missing applicationId in config
• Assuming minSdkVersion is optional

4. You tried to submit your app to the Play Store but got an error saying your APK is not signed. What is the most likely cause?

medium

A. You used the wrong package name in your manifest.

B. Your app's versionName is missing.

C. You forgot to generate and use a signing key before building the APK.

D. You set minSdkVersion too high.

Solution

1. Step 1: Understand the error message

   "APK is not signed" means the app was built without a signing key.

2. Step 2: Identify the cause

   Not generating or applying a signing key before building causes this error.

3. Final Answer:

   You forgot to generate and use a signing key before building the APK. -> Option C

4. Quick Check:

   Unsigned APK error = Missing signing key [OK]

Hint: Unsigned APK error means no signing key used [OK]

Common Mistakes:

• Confusing package name errors with signing errors
• Ignoring versionName warnings
• Thinking minSdkVersion affects signing

5. You want to submit an update to your app on the Play Store. Your current live app has versionCode 5 and versionName "1.4". Which of the following is the correct way to update these values in your build.gradle file?

hard

A. versionCode 5
versionName "1.5"

B. versionCode 6
versionName "1.4"

C. versionCode 4
versionName "1.5"

D. versionCode 6
versionName "1.5"

Solution

1. Step 1: Understand Play Store versioning rules

   versionCode must increase with each update; versionName usually increases to reflect new version.

2. Step 2: Evaluate options

   versionCode 6 versionName "1.5" increases versionCode to 6 and versionName to "1.5", which follows rules.

3. Final Answer:

   versionCode 6 versionName "1.5" -> Option D

4. Quick Check:

   Update requires higher versionCode and updated versionName [OK]

Hint: Always increase versionCode and update versionName for new releases [OK]

Common Mistakes:

• Keeping versionCode same as previous release
• Decreasing versionCode accidentally
• Not updating versionName with new release