how to set media scan restrictions on Android in code

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http://stackoverflow.com – I got a problem when running Android 4.0 source code on my phone. when it comes to pick a alarm ringtone, even i pick two different ringtone: Nobelium and Neon, but they sound the same. so I come to check the source code, and I found this: and the each .ogg file under \juice\trunk\frameworks\base\data\sounds\alarms\ogg-jp has a same sounded file but with different name(Nobelium vs Neon, FireDrill vs Krypton) under \juice\trunk\frameworks\base\data\sounds\alarms. so what is ogg-jp used for, and how the set restriction to avoid duplicating (HowTos)