I want to add apps usage statistic feature to my android
application.So that i am looking spare parts code cuz it does what i
want.And i got it how it works.But there is a question in my mind
Spare part is using following classes;

android.app.ActivityManagerNative;
android.os.ServiceManager;
android.view.IWindowManager;

and these are not included in default android sdk , there are in
android source code tree.

my-dir/frameworks/base/core/java/android/app/
ActivityManagerNative.java

Is there any restriction by google to use these classes in my
application ?
note:I will publish my app on market.

I have read something on the google mail groups , we should not use
the internal classes/apis in our apps such as telephony.
Is it true ?
ActivityManagerNative is a Internal api ?
At last what are the internal apis/clases?

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