Mobile Development Collective

4352 votes

130 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 ...

Community wiki

31 revs, 19 users 19%
Vidar Vestnes

3554 votes

78 answers

1.1m 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 ...

Community wiki

18 revs, 13 users 37%
Peter Mortensen

6391 votes

34 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?

capecrawler

67.9k

asked Jan 8, 2010 at 3:23

3172 votes

54 answers

831k 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 ...

Mark

39.8k

asked Oct 12, 2009 at 15:03

2735 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....

bejoy george

29.7k

asked Jun 14, 2011 at 12:02

2327 votes

75 answers

1.5m views

How do I center text horizontally and vertically in a TextView?

How do I center the text horizontally and vertically in a TextView, so that it appears exactly in the middle of the TextView in Android?

Pablo Fernandez

285k

asked Jan 11, 2009 at 0:27

3095 votes

54 answers

1.3m views

Is there a unique Android device ID?

Do Android devices have a unique ID, and if so, what is a simple way to access it using Java?

Tyler

31.5k

asked May 7, 2010 at 0:47

1792 votes

98 answers

654k views

How can I make a UITextField move up when the keyboard is present - on starting to edit?

With the iOS SDK: I have a UIView with UITextFields that bring up a keyboard. I need it to be able to: Allow scrolling of the contents of the UIScrollView to see the other text fields once the ...

Community wiki

25 revs, 15 users 42%
philfreo

2340 votes

51 answers

768k views

Vertically align text to top within a UILabel

I have a UILabel with space for two lines of text. Sometimes, when the text is too short, this text is displayed in the vertical center of the label. How do I vertically align the text to always be ...

Stefan

28.9k

asked Jun 28, 2009 at 8:54

1130 votes

108 answers

905k views

R cannot be resolved - Android error

I just downloaded and installed the new Android SDK. I wanted to create a simple application to test drive it. The wizard created this code: package eu.mauriziopz.gps; import android.app.Activity; ...

Community wiki

9 revs, 6 users 58%
Maurizio Pozzobon

1323 votes

82 answers

1.0m views

Xcode - How to fix 'NSUnknownKeyException', Reason: "… this class is not key value coding-compliant for the key X" error?

I'm trying to link a UILabel with an IBOutlet created in my class. My application is crashing with the following error" *** Terminating app due to uncaught exception 'NSUnknownKeyException', ...

Community wiki

26 revs, 16 users 36%
Guillaume Dubois

2871 votes

35 answers

910k views

How can I save an activity state using the save instance state?

I've been working on the Android SDK platform, and it is a little unclear how to save an application's state. So given this minor re-tooling of the 'Hello, Android' example: package com.android.hello; ...

Bernard

45.5k

asked Sep 30, 2008 at 4:41

1968 votes

44 answers

1.2m views

How to get screen dimensions as pixels in Android

I created some custom elements, and I want to programmatically place them to the upper right corner (n pixels from the top edge and m pixels from the right edge). Therefore I need to get the screen ...

Niko Gamulin

66.4k

asked Jun 19, 2009 at 8:25

2082 votes

41 answers

579k views

How to lazy load images in ListView in Android

I am using a ListView to display some images and captions associated with those images. I am getting the images from the Internet. Is there a way to lazy load images so while the text displays, the UI ...

lostInTransit

70.8k

asked Feb 12, 2009 at 15:59

1537 votes

53 answers

1.3m views

How do I pass data between Activities in Android application?

I have a scenario where, after logging in through a login page, there will be a sign-out button on each activity. On clicking sign-out, I will be passing the session id of the signed in user to sign-...

UMAR-MOBITSOLUTIONS

77.8k

asked Jan 19, 2010 at 6:06

1242 votes

67 answers

1.1m views

You need to use a Theme.AppCompat theme (or descendant) with this activity

Android Studio 0.4.5 Android documentation for creating custom dialog boxes: http://developer.android.com/guide/topics/ui/dialogs.html If you want a custom dialog, you can instead display an ...

ant2009

23.3k

asked Feb 16, 2014 at 17:34

1591 votes

39 answers

925k views

How can you get the build/version number of your Android application?

I need to figure out how to get or make a build number for my Android application. I need the build number to display in the UI. Do I have to do something with AndroidManifest.xml?

Fahad Ali Shaikh

15.9k

asked Jan 6, 2011 at 14:43

790 votes

103 answers

1.2m views

"cannot resolve symbol R" in Android Studio

In every instance in all of my classes where I reference R.id.something, the R is in red and it says "cannot resolve symbol R". Also every time there is R.layout.something it is underlined in red and ...

ez4nick

9,937

asked Jun 11, 2013 at 21:18

1727 votes

39 answers

1.5m views

Android 8: Cleartext HTTP traffic not permitted

I had reports from users with Android 8 that my app (that uses back-end feed) does not show content. After investigation I found following Exception happening on Android 8: 08-29 12:03:11.246 11285-...

david.s

17.5k

asked Aug 29, 2017 at 13:48

1623 votes

44 answers

1.2m views

How can I open a URL in Android's web browser from my application?

How to open a URL from code in the built-in web browser rather than within my application? I tried this: try { Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(download_link)); ...

Arutha

26.4k

asked Feb 4, 2010 at 17:51

1236 votes

55 answers

627k views

How do I "select Android SDK" in Android Studio?

After a successful import of an Eclipse-Android-Project into "Android Studio 1.4", I get the error "Please select Android SDK" when I click on the button to run the application in ...

delete

18.9k

asked Dec 18, 2015 at 10:16

1088 votes

62 answers

674k views

How to change Status Bar text color in iOS

My application has a dark background, but in iOS 7 the status bar became transparent. So I can't see anything there, only the green battery indicator in the corner. How can I change the status bar ...

Oleksandr Veremchuk

11k

asked Jul 16, 2013 at 14:11

2258 votes

32 answers

821k views

What is 'Context' on Android?

In Android programming, what exactly is a Context class and what is it used for? I read about it on the developer site, but I am unable to understand it clearly.

Brigadier

23.4k

asked Aug 26, 2010 at 6:12

1500 votes

44 answers

525k views

Passing data between view controllers

I'm new to iOS and Objective-C and the whole MVC paradigm and I'm stuck with the following: I have a view that acts as a data entry form and I want to give the user the option to select multiple ...

Matt Price

34.6k

asked Mar 6, 2011 at 12:43

1299 votes

50 answers

700k views

Activity has leaked window that was originally added

What is this error, and why does it happen? 05-17 18:24:57.069: ERROR/WindowManager(18850): Activity com.mypkg.myP has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44c46ff0 ...

Pentium10

207k

asked May 17, 2010 at 15:51

1389 votes

44 answers

652k views

Strange OutOfMemory issue while loading an image to a Bitmap object

I have a ListView with a couple of image buttons on each row. When the user clicks the list row, it launches a new activity. I have had to build my own tabs because of an issue with the camera layout. ...

Community wiki

24 revs, 17 users 20%
Chrispix

1300 votes

44 answers

1.8m views

How to get current time and date in Android

How can I get the current time and date in an Android app?

M7M

13.1k

asked Mar 20, 2011 at 16:12

933 votes

66 answers

822k views

Xcode building for iOS Simulator, but linking in an object file built for iOS, for architecture 'arm64'

I am trying to get a large (and working on Xcode 11!) project building in Xcode 12 (beta 5) to prepare for iOS 14. The codebase was previously in Objective-C, but now it contains both Objective-C and ...

btxios

9,515

asked Aug 26, 2020 at 23:40

924 votes

71 answers

491k views

"Conversion to Dalvik format failed with error 1" on external JAR

In my Android application in Eclipse, I get the following error. UNEXPECTED TOP-LEVEL EXCEPTION: java.lang.IllegalArgumentException: already added: Lorg/xmlpull/v1/XmlPullParser; .... Conversion to ...

Community wiki

9 revs, 5 users 46%
Michel

4031 votes

12 answers

369k views

Proper use cases for Android UserManager.isUserAGoat()?

I was looking at the new APIs introduced in Android 4.2. While looking at the UserManager class I came across the following method: public boolean isUserAGoat() Used to determine whether the ...

Ovidiu Latcu

72.2k

asked Nov 14, 2012 at 8:34

1277 votes

42 answers

543k views

How can I disable the UITableView selection?

When you tap a row in a UITableView, the row is highlighted and selected. Is it possible to disable this so tapping a row does nothing?

davidmytton

39.1k

asked Oct 10, 2008 at 11:32

1948 votes

28 answers

536k views

What's the difference between the atomic and nonatomic attributes?

What do atomic and nonatomic mean in property declarations? @property(nonatomic, retain) UITextField *userName; @property(atomic, retain) UITextField *userName; @property(retain) UITextField *...

Alex Wayne

185k

asked Feb 26, 2009 at 2:31

732 votes

78 answers

327k views

Why is there extra padding at the top of my UITableView with style UITableViewStyleGrouped in iOS7

Starting in iOS7, there is additional space at the top of my UITableView's which have a style UITableViewStyleGrouped. Here is an example: The tableview starts at the first arrow, there are 35 pixels ...

esilver

28.2k

asked Sep 18, 2013 at 19:07

1606 votes

30 answers

969k views

Transport security has blocked a cleartext HTTP

What setting do I need to put in my info.plist to enable HTTP mode as per the following error message? Transport security has blocked a cleartext HTTP (http://) resource load since it is insecure....

Jeef

27.2k

asked Jul 6, 2015 at 20:10

1313 votes

42 answers

723k views

Run/install/debug Android applications over Wi-Fi?

I thought there was a way to test your applications in development over Wi-Fi. Is this possible? I'd love to be able to untether my phone and develop wirelessly.

Naftuli Kay

90.4k

asked Feb 4, 2011 at 2:23

1408 votes

39 answers

514k views

How can I check for an active Internet connection on iOS or macOS?

I would like to check to see if I have an Internet connection on iOS using the Cocoa Touch libraries or on macOS using the Cocoa libraries. I came up with a way to do this using an NSURL. The way I ...

Brock Woolf

47.1k

asked Jul 5, 2009 at 8:45

1242 votes

45 answers

450k views

Android SDK installation doesn't find JDK

I'm trying to install the Android SDK on my Windows 7 x64 System. jdk-6u23-windows-x64.exe is installed, but the Android SDK setup refuses to proceed because it doesn't find the JDK installation. ...

Community wiki

11 revs, 11 users 44%
Simon

569 votes

98 answers

515k views

Error type 3 Error: Activity class {} does not exist

I have an IntelliJ Android project, that I successfully imported to Android Studio 0.4.0. It works perfectly if I don't change anything in manifest. However, when I want to change the launcher ...

Jacob

15.2k

asked Jan 4, 2014 at 0:35

1125 votes

45 answers

840k views

How to add dividers and spaces between items in RecyclerView

This is an example of how it could have been done previously in the ListView class, using the divider and dividerHeight parameters: <ListView android:id="@+id/activity_home_list_view" ...

EyesClear

28.3k

asked Jul 7, 2014 at 20:01

1614 votes

29 answers

710k views

Using Auto Layout in UITableView for dynamic cell layouts & variable row heights

How do you use Auto Layout within UITableViewCells in a table view to let each cell's content and subviews determine the row height (itself/automatically), while maintaining smooth scrolling ...

smileyborg

30.4k

asked Sep 11, 2013 at 16:48

1160 votes

40 answers

697k views

How to make links in a TextView clickable

I have the following TextView defined: <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/txtCredits" ...

Richard

28.8k

asked Apr 29, 2010 at 1:41

1250 votes

40 answers

298k views

Is quitting an application frowned upon?

Moving on in my attempt to learn Android, I just read the following: Question: Does the user have a choice to kill the application unless we put a menu option in to kill it? If no such option ...

Community wiki

7 revs, 6 users 67%
Ted

1215 votes

38 answers

1.7m views

How do I display an alert dialog on Android?

I want to display a dialog/popup window with a message to the user that shows "Are you sure you want to delete this entry?" with one button that says 'Delete'. When Delete is touched, it should delete ...

Community wiki

10 revs, 8 users 37%
UMAR-MOBITSOLUTIONS

1269 votes

43 answers

1.1m views

How can I develop for iPhone using a Windows development machine?

Is there any way to tinker with the iPhone SDK on a Windows machine? Are there plans for an iPhone SDK version for Windows? The only other way I can think of doing this is to run a Mac VM image on a ...

Community wiki

6 revs, 6 users 36%
ryan

2084 votes

23 answers

767k views

Is there a way to run Python on Android?

We are working on an S60 version and this platform has a nice Python API.. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the ...

Bite code

591k

asked Sep 19, 2008 at 13:21

1462 votes

34 answers

409k views

Activity restart on rotation Android

In my Android application, when I rotate the device (slide out the keyboard) then my Activity is restarted (onCreate is called). Now, this is probably how it's supposed to be, but I do a lot of ...

Isaac Waller

32.7k

asked Jan 19, 2009 at 0:28

726 votes

64 answers

519k views

How to check internet access on Android? InetAddress never times out

I got a AsyncTask that is supposed to check the network access to a host name. But the doInBackground() is never timed out. Anyone have a clue? public class HostAvailabilityTask extends AsyncTask<...

Vidar Vestnes

42.9k

asked Oct 13, 2009 at 14:59

1194 votes

37 answers

790k views

findViewById in Fragment

I am trying to create an ImageView in a Fragment which will refer to the ImageView element which I have created in the XML for the Fragment. However, the findViewById method only works if I extend an ...

simplified.

12.1k

asked Jun 27, 2011 at 16:24

556 votes

88 answers

784k views

Getting error "No such module" using Xcode, but the framework is there

I'm currently coding in Swift, and I've got an error: No such module Social But I don't understand, because the module is in my project, declared in "Linked frameworks and Libraries" and in "...