Android Tips for Installing Apps and Games
The majority of people will use Android Market to install apps and games. You can read about this in our Android Market Guide, and you should also check out How to Use Android Market Safely for some useful Android tips.
Sometimes it will be necessary to install an app or game without using the Market. Android apps or games are packaged in files called .APK files. In order to install an .APK file you should start by hitting Menu > Settings > Applications > Unknown sources (tap to “Allow installation of non-Market applications").
Now, you can go down the fiddly route of installing the Android SDK on your computer, or use a file manager app and move the .APK file over via a wired connection, but there are easier options. My preferred method is to use Dropbox. There’s an Android Dropbox app, and if you also have the client installed on your PC, you can easily drag and drop files to share them (it offers 2GB of free online storage). This does mean signing up for a Dropbox account.
If you don’t want to have to sign up for anything then try out Awesome Drop. Install the app on your phone, visit the Awesome Drop site in your computer, and then you can drag and drop a file onto your web browser, you’ll get a unique number to type in and you can transfer the file without any sign up.
Another easy way to install an .APK file on your Android phone is to just email the .APK file to any email account you have configured on your phone.
Simply clicking on the .APK file once it arrives should prompt the install.