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I want to add three linear layouts to an activity programatically each of same width. the problem is i am not able to set the weights of these layouts programmatically. I could do this within xml, but I want to do this in program. here is what I want: 
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LinearLayout. LayoutParams param = new LinearLayout. LayoutParams( 0, LayoutParams. MATCH_PARENT, 1);
Weight can only be used in LinearLayout . If the orientation of linearlayout is Vertical, then use android:layout_height="0dp" and if the orientation is horizontal, then use android:layout_width = "0dp" . It'll work perfectly.
Layout WeightThis attribute assigns an "importance" value to a view in terms of how much space it should occupy on the screen. A larger weight value allows it to expand to fill any remaining space in the parent view.
Answer: Per documentation, android:weightSum defines the maximum weight sum, and is calculated as the sum of the layout_weight of all the children if not specified explicitly.
Here its the solution
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(0, 100); lp.weight = 1; See Full Solution
LinearLayout ll1, ll2, ll3; /* Find these LinearLayout by ID i.e ll1=(LinearLayout)findViewById(R.id.ll1); */ LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(0, 100); lp.weight = 1; ll1.setLayoutParams(lp); ll2.setLayoutParams(lp); ll3.setLayoutParams(lp); Use new LinearLayout.LayoutParams(int width, int height, float weight) to set weights when setting layout params to the subviews
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