How to strench child elements in LinearLayout

I have LinearLayout, and I am trying to make the child elements to be 100%. so far I have this

[E1] [E2] [E3] 

while I want them to be

[E1]  
[E2]  
[E3] 

what properties开发者_Go百科 should I change?? I tried several such as layout_width

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Set LinearLayout orientation to vertical

android:orientation="vertical"

And make all elements fill parent.

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You should change orientation property of your LinearLayout to vertical