Mobile Development Collective

A collective for developers who want to share their knowledge and learn more about mobile development practices and platforms

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Android Frequently Asked Questions

The Android-related questions that get asked repeatedly, gathered together in one place. What does a new developer always ask at some point? What are the most common questions when someone is ...

Berthold♦

answered Oct 4, 2023 at 18:27

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-2 votes

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are these javascript-obfuscator settings safe?

const fs = require("fs"); const path = require("path"); const JavaScriptObfuscator = require("javascript-obfuscator"); fs.readdirSync(inputDir).forEach((file) => { ...

Bear Bile Farming is Torture

5,499

asked 4 hours ago

-1 votes

0 answers

41 views

How can I get the Heart Point logic from Google Fit?

As Google already announced that neither Google Fit SDK nor Fitness API is possible to integrate or enable it. The only way to fetch your data into Android mobile device is Health Connect. I have the ...

jimmytrivedi

asked 21 hours ago

0 votes

0 answers

51 views

Flutter UI not matching design: top-right badge not properly attached to card border

Here is what I am trying to do: The screenshot is taken from a iPhone 15 Pro: I’m trying to build a pricing UI in Flutter, but the layout is not matching the design—specifically the top-right badge (...

Frank van Puffelen

604k

modified yesterday

2 votes

0 answers

114 views

How to implement and update a Room database correctly?

I am programming a Counter App where the count is stored in a database. I am using Kotlin, Jetpack Compose, Room and Hilt. When I press the Button for increment, the count do not change. I tried to ...

Nick

modified 13 hours ago

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0 answers

71 views

Android PrintService printer not shown in main list without WiFi — any workaround for Bluetooth/USB printers?

I have a custom PrintService implementation in my Android app for Bluetooth and USB receipt printers (used in a restaurant POS system). The service correctly calls addPrinters() inside ...

alina revuteck

modified yesterday

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Tooling

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3 replies

66 views

Generating and executing Java .class bytecode on Android at runtime without use of storage space

I am looking for a way to execute dynamically generated Java bytecode on both OpenJDK VM and DalvikVM. In other words, I want to make platform-agnostic on-the-fly compiler to Java bytecode, using only ...

Gabe Sechan

95.3k

answered 2 hours ago

Answer

Just for your reference- any app that does this will violate the Google Play guidelines and not be allowed on the store. You can do it in a personal app or a sideload, but not anything on any of the ...

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Gabe Sechan

95.3k

answered 2 hours ago

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2 answers

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Does "nonisolated(sending) by Default" setting conflict with "Default actor isolation" setting in Xcode 26?

Before Xcode 26, we have 2 global functions: func syncMethod() {} func asyncMethod() async {} The behavior is that syncMethod is non-isolated, and will be called in the same isolation context as the ...

Rob

442k

modified 5 hours ago

Answer

There are two very separate issues at play: You have identified the historic asymmetry with regard to nonisolated functions, namely where synchronous ones ran on the current thread but asynchronous ...

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Rob

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answered 20 hours ago

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1 answer

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DispatchQueue's closure is @Sendable, how can it access main actor isolated values?

Let's first try this code: func viewDidLoad() { DispatchQueue.global().async { self.view.backgroundColor = red } } This obviously fails in Swift 6, because the closure is @Sendable , meaning ...

Sweeper

295k

answered yesterday

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DispatchQueue.main.async is just a special case hardcoded into the compiler. This is checked by the function isMainDispatchQueueMember, which simply looks at the AST to see if it matches "...

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Sweeper

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answered yesterday

Advice

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3 replies

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Dynamic UIColor from asset catalog doesn't update CALayer.borderColor when switching between light and dark mode — modern workaround?

I'm implementing dark mode in a UIKit app and ran into the well-known issue that CALayer.borderColor (and shadowColor, CAShapeLayer.strokeColor, etc.) doesn't update automatically when the user ...

Léo Natan

57.2k

answered 13 hours ago

Answer

The most modern approach, as of iOS 26, is updateProperties(), where you set up your layer's colors. The system should observe these changes, and whenever a change in the environment happens, it will ...

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Léo Natan

57.2k

answered 13 hours ago

Advice

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2 replies

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Which Android 'background work' feature to use for sending information?

I am currently developing an Android application with Kotlin and Jetpack Compose that should repeatedly (~once per minute) collect some information about my phone (battery, temperature, current ...

AneequeMalik

modified 2 days ago

Answer

Are you building your own custom firmware (ROM) and deploying that to the device? If yes, you will have more options. If not, then it is unlikely that you can reliably do what you seek at that ...

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CommonsWare

1.0m

answered 2 days ago

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These are the most active questions in Mobile Development Collective

4372 votes

132 answers

1.9m views

How can I close/hide the Android soft keyboard programmatically?

I have an EditText and a Button in my layout. After writing in the edit field and clicking on the Button, I want to hide the virtual keyboard when touching outside the keyboard. Can someone provide a ...

Giorgos Neokleous

1,787

modified Jul 12, 2025 at 9:09

3569 votes

78 answers

1.2m views

Why is the Android emulator so slow? How can we speed up the Android emulator?

I have got a 2.67 GHz Celeron processor, and 1.21 GB of RAM on a x86 Windows XP Professional machine. My understanding is that the Android Emulator should start fairly quickly on such a machine, but ...

UMAR-MOBITSOLUTIONS

78.1k

modified Dec 30, 2025 at 12:01

6432 votes

35 answers

1.5m views

What is the difference between px, dip, dp, and sp?

What is the difference between the units of measure px, dip, dp, and sp?

Harsh Trivedi

modified Aug 4, 2025 at 20:01

3181 votes

54 answers

843k views

How can I stop EditText from gaining focus when an activity starts in Android?

I have an Activity in Android, with two elements: EditText ListView When my Activity starts, the EditText immediately has the input focus (flashing cursor). I don't want any control to have input ...

Peter Mortensen

31.1k

modified Feb 3 at 1:51

2748 votes

65 answers

1.5m views

How can I fix 'android.os.NetworkOnMainThreadException'?

I got an error while running my Android project for RssReader. Code: URL url = new URL(urlToRssFeed); SAXParserFactory factory = SAXParserFactory.newInstance(); SAXParser parser = factory....

Benjamin Loison

5,780

modified Apr 13 at 22:06

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These are the most recent articles in Mobile Development Collective

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1 minute read

How-to guide

Using SwiftData with SwiftUI

One thing we iOS developers should rejoice about is the development of SwiftData, at least if you are coding for a very new project and can forget about iOS versions below 17. We finally have an ...

otaviokz

created Feb 7, 2024 at 1:38

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