This is custom android 4.4 SDK(the original packages shoub be in /path/to/your/android-sdk/platforms/android-19),it contains all @hide and @internal stuff(you should need:)).
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Clone this repos and copy all files into
/path/to/your/android-sdk/platforms/android-19-full
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Restart your android studio and open moudle settings, then choose
API 91
Using internal (com.android.internal) and hidden (@hide) APIs