Why is this my android. Xml file error

Error :: Unexpected namespace prefix "xmlns" found for tag LinearLayout

  
android: orientation = "vertical" android: layout_width = "fill_parent" 
android: layout_height = "fill_parent"> 

android: orientation = "horizontal" android: layout_width = "fill_parent" 
android: layout_height = "fill_parent" android: layout_marginLeft = "20dp" 
android: layout_marginRight = "20dp"> 
android: textSize = "20dp" android: layout_height = "wrap_content" /> 
android: layout_height = "wrap_content" /> 
 
android: orientation = "horizontal" android: layout_width = "fill_parent" 
android: layout_height = "fill_parent" android: layout_marginLeft = "20dp" 
android: layout_marginRight = "20dp"> 
android: layout_height = "wrap_content" android: text = "Password:" 
android: textSize = "20dp" /> 
android: layout_height = "wrap_content" android: password = "true" /> 
 

 

Reply:
My novice just encountered this problem, and then I found the format that you put down the code aligned no problem, you try to change the format of the following look at it:

xmlns: android = "http://schemas.android.com/apk/res/android"
android: orientation = "vertical"
android: layout_width = "fill_parent"
android: layout_height = "fill_parent">
xmlns: android = "http://schemas.android.com/apk/res/android"
android: orientation = "horizontal"
android: layout_width = "fill_parent"
android: layout_height = "fill_parent"
android: layout_marginLeft = "20dp"
android: layout_marginRight = "20dp">
android: layout_width = "wrap_content"
android: text = "User name:"
android: textSize = "20dp"
android: layout_height = "wrap_content" />
android: layout_width = "fill_parent"
android: layout_height = "wrap_content" />

xmlns: android = "http://schemas.android.com/apk/res/android"
android: orientation = "horizontal"
android: layout_width = "fill_parent"
android: layout_height = "fill_parent"
android: layout_marginLeft = "20dp"
android: layout_marginRight = "20dp">
android: layout_width = "wrap_content"
android: layout_height = "wrap_content"
android: text = "Password:"
android: textSize = "20dp" />
android: layout_width = "fill_parent"
android: layout_height = "wrap_content"
android: password = "true" />


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Or click Project -> Clean and then Run As
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Usually require only the top layer needs to Layout xmlns: android = "http://schemas.android.com/apk/res/android" attribute.
Other Layout remove the xmlns attribute.
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cited landlord lihancong55 reply:

error :: Unexpected namespace prefix "xmlns" found for tag LinearLayout





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Removal of the middle two LinearLayout xmlns: android attribute




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Recommended to remove the middle two layout of xmlns: android = "http://schemas.android.com/apk/res/android", it may be because of this error, the specific norms can look xml file. .
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Repeat defines the namespace, remove the excess back xmlns: android = "http://schemas.android.com/apk/res/android", keep the front of the linearlayout that can be
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The original of this kind I really have to go try to modify a bit of thank you reply friend
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Note that there are no such restrictions too ...
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So this is
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The original is so
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Removal of the middle two LinearLayout xmlns: android attribute because namespace defines
repeat
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