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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0 votes

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30 views

WireGuard works only after switching network interfaces (Windows 11 & Android)

I rented a server from Hostkey and I'm setting up a WireGuard VPN for use on Windows 11 and Android. I need it to work over both Wi-Fi and 4G (MTS carrier). After configuring everything, I ran into ...

Владимир Дегтярев

modified 1 hour ago

3 votes

0 answers

46 views

Android "paddingHorizontal" Doesn't Work on TextInputEdieText

XML: <com.google.android.material.textfield.TextInputLayout android:id="@+id/name_inputLayout" android:layout_width="match_parent" android:layout_height="...

Sam Chen

9,148

asked 7 hours ago

0 votes

0 answers

32 views

How i change height of DropdownMenuItem?

I am creating an auto-complete TextField using ExposedDropdownMenuBox in Jetpack Compose. I am using a custom component, SpotifyTextField that has a fixed height of 48.dp. My goal is to make each ...

Fatima Jamal

asked 11 hours ago

1 vote

0 answers

21 views

Samsung Calendar : empty event when opened with ACTION_VIEW intent

To open an existing event from its ID, I use an Intent to open the phone's default calendar app. Since November 2025, I have had many users with Samsung devices who have encountered an issue with ...

rcperso

asked 15 hours ago

2 votes

0 answers

59 views

Android (Linux) libc problems when creating an execuatable shared object

I have 2 files: crt.c: const char service_interp[] __attribute__((section(".interp"))) = "${LD_SO}"; extern void _exit (int __status) __attribute__ ((__noreturn__)); int main(); ...

Stas Badzi

modified 15 hours ago

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RealityKit's custom light entity causes a black artifact on my 3D model

I’m working with RealityKit and I’m seeing a strange black artifact appear in the center of my rendered model. Here’s the relevant code: let camera = PerspectiveCamera() camera.transform = ...

slip_def

answered 2 days ago

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Manifest Merge Error when using Blueline Kotlin lIbrary

I'm currently learning on how to use thermal printer, and found a library named Blueline. But when i implement it, app can't compile due to Manifest merger failed with multiple errors, see logs This ...

CommonsWare

1.0m

answered 14 hours ago

Answer

This feels like a bug in the libraries. Both blueline-core-android and blueline-compose-builder use com.dilivva.blueline.compose as the namespace in the android closure in build.gradle.kts. Those need ...

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CommonsWare

1.0m

answered 14 hours ago

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1 answer

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How to debug an app once it's in the field

I've used log messages extensively for debugging my app during development using Android Studio. It concerns me how I will debug problems users may report when the app published and out there in the ...

Gabe Sechan

94.7k

answered yesterday

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Generally you use a 3rd party logging library. These libraries will take care of logging to local disk and to the cloud, allowing you to browse the logs. They all cost money. Alternatively, you can ...

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Gabe Sechan

94.7k

answered yesterday

Best practices

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4 replies

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How to use Android Print Framework in a multithreaded app when PrintedPdfDocument is not thread-safe?

I am implementing custom document printing using Android’s Print Framework. Using the Android's documentation link as reference: https://developer.android.com/training/printing/custom-docs The flow I ...

Rohan Pande

answered 55 mins ago

Answer

This is not significantly different than how you would handle a UI. In Android, the user interface is single-threaded. So, you use multiple threads to do the "heavy lifting", gather all the ...

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CommonsWare

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answered yesterday

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1 answer

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How to prevent recreation of Activity when Navigation mode changes?

CommonsWare

1.0m

answered Nov 26 at 15:00

Answer

If you are thinking that navigation covers your scenario, it is documented as a "change to the navigation type (trackball or D-pad)". I am not aware of any configChange value that is tied to ...

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CommonsWare

1.0m

answered Nov 26 at 15:00

Best practices

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3 replies

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Is it allowed to ask “Sign in with Apple” users for their real email address if they chose “Hide My Email”?

I’m using Sign in with Apple in my iOS app. When a user chooses “Hide My Email”, I receive the @privaterelay.appleid.com relay address. For marketing reasons, I would prefer to have the user’s real ...

Paulw11

116k

answered Nov 26 at 11:11

Answer

Specifically, in clause 4.8 it says "the login service allows users to keep their email address private as part of setting up their account" also 5.1.1 (x) "Apps may request basic ...

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Paulw11

116k

answered Nov 26 at 11:11

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4374 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 at 9:09

3568 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 ...

Shubham Pandey

answered May 4, 2024 at 7:54

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 at 20:01

3180 votes

54 answers

837k views

How to 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 ...

General Grievance

5,120

modified Jun 24 at 19:30

2748 votes

66 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....

SMBiggs

11.8k

modified Dec 11, 2024 at 20:34

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13 votes

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2 minute read

Knowledge article

Basics of Kotlin coroutines

Basics of Kotlin coroutines What is a coroutine? A coroutine is a concurrency design pattern that you can use on Android to simplify code that executes asynchronously. They are“lightweight threads”. ...

amodkanthe

4,540

created May 30, 2024 at 16:18

13 votes

1k views

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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