Difference between android and app

#1

in xml we have code like

android:hint = “hint”

and

app:srcCompat= “value”

so what is the differnce between android and app and when they are used?

#2

android is used for attribute from Android Sdk
app is used for the support library or custom defined attributes.

You may also see some other namespaces here other than android or app when you use some external libraries of custom views.

#3

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