[android-developers] Package Missing 2.3 Sample Application

I tried to build the NFC sample application FakeTagsActivity .

I am getting the error for the packages starts with
com.google.common.base

import com.google.common.base.Charsets;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;

i am using the Google Apis [Android 2.3] .What packages should i need
to add more ?

android.jar & maps.jar are currently in the Eclipse path...

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