android Layout weight programmatically

Something like this:

               ......
               LinearLayout layout = (LinearLayout)findViewById(YOUR_LAYOT_ID);
               layout.setWeightSum(25f);
               LinearLayout.LayoutParams lParams = (LinearLayout.LayoutParams) layout.getLayoutParams(); //or create new LayoutParams... 

               lParams.weight = 0.5f;
               .......
               someView.setLayoutParams(lParams);
               .......  

//set as like this below for different view set different float value.

myview.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT,5f));