Mobile Development Collective

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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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1 vote

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36 views

UITabBarController on iPadOS 18 swallows all touches even with mode = .tabBar (via Python/rubicon-objc)

I'm building a Python iOS app with Toga 0.5.x (Briefcase 0.3.16), which backs toga.OptionContainer with a UITabBarController. The app works perfectly on iPhone, but on iPad Pro (M5, iOS 18 simulator) ...

rjen

2,016

modified yesterday

-1 votes

0 answers

34 views

DAT (iOS): registration completes in Meta AI app but the callback never returns to my app(release-channel/Developer Mode disabled)

I'm integrating the Meta Wearables Device Access Toolkit (DAT, iOS SDK 0.6.0) into an existing iOS app to use Ray-Ban Meta glasses (camera/photo/stream). I'm trying to register through the production /...

Ajay

asked yesterday

0 votes

0 answers

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input type="file" accept=... fails on uncommon file extensions on iOS

I want to write HTML to allow users to upload weaving pattern files. The following works perfectly on Safari and Brave on macOS 15 but fails horribly using Safari or Brave on iOS or iPadOS 26: <...

Russell Owen

modified 1 hour ago

1 vote

0 answers

66 views

iOS: Can a third-party app access a wired FTDI USB-serial optical probe? (Works on Android)

Can a third-party iPhone app use a generic FTDI USB-serial optical coupler? I'm building a cross-platform (.NET iOS / C#) app that reads smart meters via a wired optical head. The head uses an FTDI ...

Abdul Wasey

modified 12 hours ago

0 votes

0 answers

57 views

How can I print silently on Android without using PrintManager or showing the system print dialog?

I'm building a print server app for Android. The app receives print jobs from another source and should send them directly to a connected USB printer. I do not want to use Android's built-in ...

ZeeSHAN Ali

asked yesterday

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Is there a way to give Device Owner Permission in app without running it in Kiosk Mode?

I am currently developing an enterprise-level Android application and need to implement a robust, seamless app-update mechanism. Specifically, my application requires the ability to perform version ...

Robert

43.6k

modified 2 days ago

Answer

A simple workaround would be to use two apps. That way you could simply uninstall the one app and then reinstall an older version. Downgrade protection of apps are only active as long as the app is ...

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Robert

43.6k

answered 2 days ago

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1 replies

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Is it possible to create an iptable whitelist on a non-rooted android 15 device?

I am working on a project with a Blu Smartphones K2 android (OS version 15.5.178) that entails regular connection to various fixed-up hotspots. Due to the information traveling over these connections, ...

CommonsWare

1.0m

answered Jun 11 at 14:53

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Stack Overflow is for programming questions. This does not appear to be a programming question. Try https://android.stackexchange.com/.

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CommonsWare

1.0m

answered Jun 11 at 14:53

Best practices

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How test an Android app in production with respect to Play Age Signals API

In production, it's desirable to download a production app from Google Play Store, using a real child account, and then test that, for instance, the app denies usage if the adult does not consent. How ...

Gabe Sechan

95.3k

answered Jun 10 at 17:02

Answer

If you're doing it in production, the only way is to make an actual child account. I wouldn't really worry about that violating Google's terms, as in the 30 billion pages of legalese you're likely ...

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Gabe Sechan

95.3k

answered Jun 10 at 17:02

-1 votes

2 answers

75 views

Flipped images on Android [closed]

I discovered that half of the photos I took on my phone during my last trip were flipped 90 degrees. I tried flipping them using Google Photos or Google Files, but I noticed that, firstly, the photo ...

Gabe Sechan

95.3k

answered Jun 9 at 7:15

Answer

JPEG files have rotation data in the metadata of the file format. Edit that field, and see if the app you're using to view it respects the flag.

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Gabe Sechan

95.3k

answered Jun 9 at 7:15

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1 vote

7 replies

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Are these Android permissions safe for Google Play approval?

I am preparing my app for Google Play release and want to confirm if the following permissions are compliant and safe for review without policy rejection: <uses-permission android:name="...

Gabe Sechan

95.3k

answered Jun 9 at 7:28

Answer

There is no reason for any of those permissions. You're looking to pop up a notification for engagement. WHile I think that's a bad idea and annoying (I'd delete your app for doing that if there ...

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Gabe Sechan

95.3k

answered Jun 9 at 7:28

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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

modified Feb 3 at 1:51

2747 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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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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