[android help] Android App only for Tablets

I want my app only installed on Android Tablet alone. For this I have tried the following.

1. supports-screens - Designing an android tablet-only app


2. android.hardware.telephony - Restrict app installing in Tablets


3. compatiblity-screens - http://developer.android.com/guide/practices/screens-distribution.html#FilteringHansetApps


4. android.permission.CALL_PHONE - avoid app installing on tablet in android

But all the above scenarios are failed. The android app installed both Google Nexus S 4.1.0 mobile and Acer Iconia A500 tablet. Is there any other to restrict the android app only for android tablet alone.?

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