Google also states that Android 3.0 supports "USB keyboards," meaning the OS probably now includes the same basic plug-and-play keyboard support found in Windows, the Mac OS and other established operating systems.
Android 2.3 technically supports the HID profile, but connecting a Bluetooth keyboard to devices powered by this version of the Android OS often requires extra software. Smartphones and tablets powered by Android 2.2 and below do require extra software for external keyboard use. For these devices, we recommend the Freedom Pro Bluetooth keyboard.
Android 3.0 Platform Highlights
Bluetooth HID Profile Information
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