[android-developers] How can I get the number of constants included in each API ?

For example , as you know the API ContactsContract.CommonDataKinds.Email  has five types of constants.

They are TYPE_CUSTOM / TYPE_HOME / TYPE_WORK / TYPE_OTHER / TYPE_MOBILE.

Of course I can find them easily to see the API reference on the web.

But in case of programing, how can I get the number of constants included in each API.

So I mean .....

ContactsContract.CommonDataKinds.Email    ----  5  TYPE constants.

ContactsContract.CommonDataKinds.Phone    ---- 21  TYPE constants.

ContactsContract.CommonDataKinds.Relation ---- 15  TYPE constants.

ContactsContract.CommonDataKinds.Website  ----  8  TYPE constants.

regards

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