The Android L preview represents a significant design shift for Google, with the company pushing a new aesthetic it calls Material Design.

Root Required

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Procedure :

# First download the zip file and extract it
# now using rootexplorer copy the LatinlmeGoogle.apk to System/App
# And copy the libjni_latinmegooglr.so to System/lib
# finaly permission to rw-r-r-
# Goto Settings>Language& input>Google keyboad setting>Advance settings>Color Scheme>>Material>>Now Enjoy

Download Link : Android L Keyboad