JSF is a server-based webapp framework. Android is a client system. The classes in a webapp are on a completely different computer than the classes in an Android device, so they have no shared memory space. In the particular case of Android, they're also in a completely different binary format.
An Android app can invoke a webadd using the HttpURLConnection, but that doesn't solve the issue that the JSF backing bean is still not in the same JVM (or Dalvik VM, in the case of Android). And actually, JSF isn't be best interface for an Android client anyway, since its output is formatted for display rather than for use internal to a client-side app.
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subject: Connect JSF project to Android Project in eclipse