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Questions tagged [android]

Android is Google's mobile operating system, used for programming or developing digital devices (Smartphones, Tablets, Automobiles, TVs, Wear, Glass, IoT). For topics related to Android, use Android-specific tags such as android-intent, android-activity, android-adapter, etc. For questions other than development or programming but related to the Android framework, use this link: https://android.stackexchange.com.

Android is a mobile operating system developed by a consortium of developers known as the Open Handset Alliance, with the main contributor and commercial marketer being Google. It is based on a modified version of the Linux kernel and other open source software and is designed primarily for touchscreen mobile devices such as smartphones and tablets. In addition, Google has further developed Android TV for televisions, Android Auto for cars, and Wear OS for wrist watches, each with a specialized user interface. Variants of Android are also used on game consoles, digital cameras, PCs, and other electronics.

Tag Usage

When asking about your app force closing or crashing, you have to include an MCVE, which has to include a stacktrace. See also: How to Ask

When adding additional tags to questions, please use the Android-specific tags such as , , , and not individual tags like , or .

For non-developer Android questions, see Android Enthusiasts Stack Exchange.

Manufacturer-Monitored Tags

These tags are used for developer assistance by Android device manufacturers for their specific devices:

ISV-Monitored Tags

These tags are meant for libraries, services, etc. for Android that are monitored by their respective developers:

( (now deprecated))

Resources

Android Versions

Official API Documentation

Applications

Source Code and Building

Developers

Playlist of videos for Google I/O.

  • Android Tools Project Site
    On this site, you will find information about the Developer Tools for Android (Dalvik Debug Monitor Server (DDMS), hierarchy viewer, lint) and various tips & how-to documents.

In addition, there are other Android developer support sites, operating in other languages.

For non-developer questions, see the Android Enthusiasts Stack Exchange site.

Android Programming Books

Android Loggers

  • logger - Simple, pretty and powerful logger for android
  • timber - A logger with a small, extensible API that provides utility on top of Android's normal Log class.
  • LoggingInterceptor - An OkHttp interceptor which pretty logs request and response data.
  • Bugfender - Upload your logs and check them online, specially made for mobile
  • EzyLogger - Simple Lightweight logger
  • Logback Android - Logback port to Android which provides a highly configurable logging framework for Android apps.

Chat Rooms

Chat about Android with other Stack Overflow users:

Stack Exchange

IRC:

Development IDEs

Tutorials & Examples

Online Courses

Online Specialization Verified Courses

Sites that list Android libraries

Open-sourced Android apps

Samples

Podcasts for Android

Weekly

Frequently Asked Questions

1409497 questions
1600
votes
43 answers

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

How to open an 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)); startActivity(myIntent); } catch…
Arutha
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1562
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36 answers

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
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1527
votes
53 answers

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-out. Can anyone guide me on how to keep session id…
UMAR-MOBITSOLUTIONS
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1470
votes
17 answers

What is the difference between match_parent and fill_parent?

I'm a little confused about two XML properties: match_parent and fill_parent. It seems that both are the same. Is there any difference between them?
vnshetty
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1465
votes
31 answers

Is there a way to get the source code from an APK file?

The hard drive on my laptop just crashed and I lost all the source code for an app that I have been working on for the past two months. All I have is the APK file that is stored in my email from when I sent it to a friend. Is there any way to…
Frank Bozzo
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1458
votes
34 answers

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 initial setting up in the onCreate method, so I need…
Isaac Waller
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1457
votes
22 answers

What is the difference between gravity and layout_gravity in Android?

I know we can set the following values to the android:gravity and android:layout_gravity properties: center center_vertical center_horizontal, etc. But I am confused regarding both of these. What is the difference between the usage of…
Paresh Mayani
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1441
votes
8 answers

Hex transparency in colors

I'm working on implementing a widget transparency option for my app widget although I'm having some trouble getting the hex color values right. Being completely new to hex color transparency I searched around a bit although I couldn't find a…
SweSnow
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1386
votes
44 answers

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. The activity that gets launched for the result…
Chrispix
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1303
votes
13 answers

'Must Override a Superclass Method' Errors after importing a project into Eclipse

Anytime I have to re-import my projects into Eclipse (if I reinstalled Eclipse, or changed the location of the projects), almost all of my overridden methods are not formatted correctly, causing the error: The method must override a superclass…
Tim H
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1297
votes
42 answers

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
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1284
votes
43 answers

How to get current time and date in Android

How can I get the current time and date in an Android app?
M7M
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1282
votes
48 answers

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 that was originally added here 05-17 18:24:57.069:…
Pentium10
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1246
votes
40 answers

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 exists, how does the user terminate the…
Ted
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1239
votes
45 answers

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. Is this a known issue? And is there a solution?
Simon
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