Android first step

android

Q/A ????

Android Studio recognizes physical Device as Null?

connect-adb-to-device1

have to set to connect as camera (even after usb debugging is already enabled)

connect-adb-to-device

(Src: http://stackoverflow.com/questions/25614067/android-studio-recognizes-physical-device-as-null
http://www.techotopia.com/index.php/Testing_Android_Studio_Apps_on_a_Physical_Android_Device)

Why this line xmlns:android=“http://schemas.android.com/apk/res/android” must be the first in the layout xml file?
xmlns: In XML, xmlns declares a Namespace.