Difference between android namespace

Question

What is the difference between given two namespace decalration in Android.

xmlns:app="http://schemas.android.com/tools"

and

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

I am getting lint warning on using http://schemas.android.com/tools => Suspicious namespace and prefix combination

I know using http://schemas.android.com/apk/res-auto will solve the issue, but want to know the reason behind it.

http://stackoverflow.com/questions/1181888/what-does-xmlns-in-xml-mean — IntelliJ Amiya, Feb 17 '16 at 10:19

score 0 · Answer 1 · answered Feb 17 '16 at 10:21

Below namespace is used for android predifined components.

xmlns:app="http://schemas.android.com/tools"

But if you want to use custom components like appCompat or your custom defined views you have to use the other namespace as well

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

1 Answers1