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Android Resources
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Android Activity Lifecycle: This is super important to know when you are messing with Android, as there is absolutely nothing intuitive about it, and it can lead to really bizarre and unexpected functionality if you aren't familiar with it.
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Async Task: This is another area that will create headaches until you become familiar with the way Google wishes you to handle it. Essentially, they want to get anything that will take any appreciable amount of time or requires waiting (ex, anything net related) to happen off of the UI thread. They created the AsyncTask class to encapsulate a lot of this functionality, and this article details how to use it.
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Intents: For all the insane things that Google has done to make development on Android as confusing and difficult as possible, they at least got this one right. Intents are a super easy and convenient way to share information of any kind in Android. This sharing can be within an app (sharing data between activities, preserving your activity...), between apps (either targeted or as system-wide broadcasts), or between devices. I'm not positive how Kryonet is going to package up the data to share between devices, but this is a super simple way to share data across WiFi direct.