linear layout

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http://androidforums.com – I am creating an android application...And I am using a linearlayout...but when I ruN my app it showing some blank space left at the bottom.... My linear layout structure.. First is root horizontal linear layout...inside that layout .....a vertical linear layout.next of that vertical layout again a horizontal linear layout....and inside that horizontal layout there are seven linear layout with fixed height of 60 But I tried fill parent and match parent but they are not working for me.... I know its issue with different screen sizes.... But I don't know how to fix issue so that it fixes for a (General)