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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 ...
Can you answer these questions?
View all unanswered questionsThese questions still don't have an answer
1
vote
0
answers
77
views
How to get video thumbnail from content uri?
What am i trying to do?
I working on file sharing app where is a screen where list of video show and i just want to show video thumbnail. I am using jetpack compose and use coil library.
This video ...
2
votes
0
answers
35
views
How to announce page context ("Page X of Y") in HorizontalPager in Jetpack Compose with a11y?
I am building a custom selector component in Jetpack Compose. It consists of a HorizontalPager where each page contains a LazyVerticalGrid of selectable items (acting like Radio Buttons).
The problem: ...
0
votes
0
answers
22
views
Flutter NearPay SDK fails to connect to terminal with "user not found" error in sandbox
I’m integrating NearPay SDK into a Flutter application to process NFC payments on an iMin POS device and print receipts using an iMin printer.
Environment
Flutter: 3.35.5
Android: minSdkVersion 26
...
0
votes
0
answers
47
views
How to prevent C function in iOS app from being stripped when uploaded to TestFlight?
I have a iOS library that exposes a C function. This function is marked with default visibility and used via attribute tags to prevent the compiler/linker from stripping it
#ifdef __cplusplus
#define ...
0
votes
0
answers
56
views
Is it possible to change the app name to match the selected app icon (like Signal) in Expo?
I'm working on an Expo app that supports multiple app icons (e.g. Notes, Weather icons).
Is it possible to also change the app name to match the selected icon so the label updates together with the ...
Looking for an extra challenge?
View all bountied questionsThese questions have a bounty on them
3
votes
1
answer
238
views
+100
Smooth horizontal autoscroll while dragging near edges (keep item under finger)
I have a SwiftUI horizontal editor (multiple "canvases" laid out side‐by‐side in a ScrollView). When the user drags a selected object and reaches the left/right edge of the visible area, I want the ...
3
votes
1
answer
128
views
+200
Android Instrumentation test : Run button icon is not appearing for custom buildType & classes not getting resolved
I'm trying to run instrumentation tests but
Classes are not getting resolved, getting Cannot find declaration to go to
Run button icon is not appearing for @Test functions so not able to run tests
...
0
votes
2
answers
293
views
+100
Can't capture every emittion from StateFlow when testing with Turbine
I'm trying to test my viewmodels that exposes a public StateFlow via stateIn operator:
class HomeViewModel @Inject constructor(...) : ViewModel() {
private val _uiState: MutableStateFlow<State&...
Recommended answers
View all recommended answersThese answers have been recommended
0
votes
2
answers
46
views
Using SwiftUI MapReader to position Views over map
I'm trying to use SwiftUI to make a ZStack containing a Map (with a MapKit map view), and a Circle view that is placed on top of it. The Circle's pixel position should be to the pixel position on the ...
Answer
It seems like the map proxy is not "ready" to do coordinate conversions yet, in the onMapCameraChange closure. If you do the conversion asynchronously by wrapping it in a DispatchQueue.main....
Best practices
1
vote
1
replies
43
views
How to create a programmatic list of lists
My code loops through rows in SQLite and builds text views / image views to add to linear layouts and displays on screen. My users add fabric manually so each entry would be very different across ...
Answer
Look up RecyclerView. It's a way to efficiently do scrollable repeated layouts.
Advice
2
votes
1
replies
68
views
Using Actor is always the best practice in Swift Concurrency world?
I'm generally holding a Task variable to use cancel for an efficiency in somewhere. (and also calling cancel before setting the Task to avoid making duplicate asynchronous job.)
class Test {
private ...
Answer
I don’t think you are overthinking this. This is precisely the sort of thought process you should go through if your type has any mutable state, IMHO. Actor isolation is the simplest way to mitigate ...
Advice
0
votes
3
replies
46
views
What is the most memory-efficient UI artefact to display a "Critical Out of Memory (OOM)" alert in Android?
I am looking for a way to display a "Critical Memory" warning to the user when application reaches "Out of Memory' (OOM) state.
When app reaches the OOM state, the Java heap is ...
Answer
You don't. When you go OOM, except in very specific circumstances there's no way to know what allocation failed, and thus no way to know if you can continue and work correctly at all. The correct ...
4
votes
1
answer
73
views
How to find out if a URI is a MediaStore URI
When using ContentResolver.query() on Android to find out the display name of a content URI, I need to use different projections depending on whether the URI is a document or a MediaStore URI. When ...
Answer
I do not think there is a reliable way to determine if a Uri is from whatever the device manufacturer is using to implement MediaStore. So, if DocumentsContract.isDocumentUri() returns false, query ...
See what's trending
View all trending questionsThese are the most active questions in Mobile Development Collective
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 ...
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 ...
6430
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?
3180
votes
54
answers
837k
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 ...
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....
Learn something new
These are the most recent articles in Mobile Development Collective
12
votes
1k
views
1 minute read
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 ...
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