android xml unexpected namespace prefix [duplicate]

Question

On github there is a library for tab menu, which I tried to add to my project (https://github.com/michaldrabik/TapBarMenu ). The library is used by including in xml file new object:

 <com.michaldrabik.tapbarmenulib.TapBarMenu android:id="@+id/tapBarMenu" android:layout_width="match_parent" android:layout_height="56dp" android:layout_gravity="center_horizontal|bottom" app:tbm_backgroundColor = "@color/colorPrimaryDark" app:tbm_menuAnchor = "top" app:tbm_buttonPosition = "left" android:layout_margin="10dp">

It worked. Later I tried to add more flexibility and also added class TapBarMenu from library and added:

 <TapBarMenu android:id="@+id/tapBarMenu02" android:layout_width="match_parent" android:layout_height="56dp" android:layout_gravity="center_horizontal|bottom" android:tbm_backgroundColor = "@color/colorPrimaryDark" app:tbm_menuAnchor = "top" app:tbm_buttonPosition = "left" android:layout_margin="10dp">

However for second inclusion Android Studio says: "unexpected namespace prefix" for app, whereas in the beginning of xml

xmlns:app="http://schemas.android.com/apk/res-auto"

I've read Android doc NamespaceContext, but it's rather short. Please tell how to use local class in xml and point to good place to read about namespaces for Android.

where is TapBarMenu class

Pavya
– Pavya

2015-12-31 05:56:04 +00:00
Commented Dec 31, 2015 at 5:56 — Pavya
– Pavya, Commented Dec 31, 2015 at 5:56

Mohammad Salem · Accepted Answer · 2015-12-31 06:15:23Z

1

if you put it in a package with the name com.example.myapp then you need to reference it with <com.example.myapp.TapBarMenu

answered Dec 31, 2015 at 6:15

Mohammad Salem

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