Finding Libraries

Finding a library that fits your needs starts where all the rest of your questions have been answered so far: that's right, stackoverflow.

Libraries are useful for solving problems that appear over and over again in different applications. If you search Stack Overflow, often the accepted solution to the problem you are trying to solve will be a third party library that does exactly what you're looking for.

I'd also like to mention two more resources for finding libraries:
The first one is Android Arsenal, which is a large library of libraries (aha) that just about anyone can add to. There are literally thousands of libraries on here, of highly varied quality.
The second resource is this Github page, which lists some of the most commonly used android libraries.

But Wait!

A word of caution: just because there is a library that seems like a perfect fit for your need, do not be too hasty in adding it to your application. Using a library that is not well maintained or documented comes with a host of other issues and is likely to cause more of a headache than it cures. The next video will be devoted to figuring out whether a library is a good candidate for your application.

64K Method Limit

Another consideration in deciding whether or not to use a library is to be aware of how it will affect the size of your app. When your app, including the libraries it uses, reaches a certain size, you encounter build errors that indicate your app has reached a limit of the Android app build architecture (64K Method Limit). Libraries are commonly used and without a doubt efficient, but do be aware of theses considerations.