Google Android 2.3 User Manual page 34

Android basics
Change the keyboard language
If you've used the Android Keyboard settings to make more than one language
available when using the onscreen keyboard (see "Android Keyboard settings screen"
on page 372), the current keyboard language is displayed on the Space key and you
can switch languages.
1 Touch & hold the Space key.
2 Without lifting your finger, move it to the left or right until the language you want
appears in the center of the small window above the Space key.
3 Lift your finger.
If you have many languages available, you may have to repeat these steps to find
the language you want.
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Android User's Guide