Working with a team of developers can be great because you have someone to talk to when you hit the coding wall. If you don’t have that luxury, you can still learn how other programmers do things in order to sharpen your skills. That’s what XDA Recognized Contributor coolsandie had in mind when he started his list of all open source Android apps.
The list is huge, spanning several posts in the original thread, so there are many examples to learn from. All of the apps listed are available in the Play Store, which should equate to them being less buggy than random code snippets found in the wild. You can install them to see what features they include, then follow the list’s links to the source code to see how the original developers did everything.
Just reading through the source code is a great way to improve your own work and decrease the time you spend developing, but this is also a great resource to turn to when faced with a very specific problem. Want to know how to detect movement? Check out Pedometer which keeps tracks of how many steps you take each day. Need an example of how to add Widgets as part of your App? You’ll have no problem finding one in this list.