what is the use of xmlns:android ? could you explain little bit more? Thanks in advance
Note :
xmlns:android
Defines the Android namespace. This attribute should always be set to “http://schemas.android.com/apk/res/android“.
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It’s the namespace for the XML.
Wikipedia wraps it up nicely:
Basically, it’s used to identify the android specific tags and to avoid mix-up with other elements that have the same name but are not related with android.