Strange layout files, obviously yes

 
xmlns: android = "http://schemas.android.com/apk/res/android" 
android: layout_width = "match_parent" 
android: layout_height = "match_parent"> 
android: layout_width = "match_parent" 
android: layout_height = "wrap_content" 
android: text = "@ string / hello_world" /> 

Eclipse Tip: The first one is wrong.
Obviously yes, ah, this Zenmo thing.<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
Reply:

cited landlord jiangmuchen reply:

 
xmlns: android = "http://schemas.android.com/apk/res/android" 
android: layout_width = "match_parent" 
android: layout_height = "match_parent"> 
android: layout_width = "match_parent" 
android: layout_height = "wrap_content" 
android: text = "@ string / hello_world" /> 

Eclipse Tip: The first one is wrong.
Obviously yes, ah, this Zenmo thing.

Tip The first line is wrong
Reply:
I stick to my eclipse, tips are correct, you create a new project to see
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I'm here in my test is normal, the landlord first save and then compile it, first clean enough, then what works, and then compile it should be no problem.
Reply:
What you will not see tips, api18 requires linear layout should have oration ..

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

android: layout_width = "match_parent" 
android: layout_height = "wrap_content" 
android: text = "@ string / hello_world" /> 

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Upstairs said should tricky, I think it is less of orientation is the layout direction is vertical or sideways
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The default layout is the orientation, the computer may not react, or else from the first line, and began to write, or format under catr + shift + f
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ori not write that the system default is the horizontal direction
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Your TextView and Button on the same line by default, but you give them attributes are all match_parent. You put a wide deleted, add weight, you should be ok!