[magic_haze]

Keepass proper has a global Ctrl+Alt+A shortcut that automatically types in your username and password into the form: I've found it works fine on the majority of sites (almost everyone uses username-tab-password-enter, but for the few that don't, you can specify a custom auto type format in keepass. It even has an option to obfuscate the typing to trick keyloggers).

For android, I recommend Keypass2Android: it comes with a custom keyboard you can enable temporarily, which inputs your password without going through the android clipboard. I use it with the dropbox app as well, I'm not sure why it's not working for you.

[Bassetts]

KeePassDroid is another good one for Android. It does use the clipboard though by giving you two notifications to click on. One for the username, and one for the password of the chosen credentials.

I need to give KeePass2Android a try.