android 代码动态创建视图

LinearLayout 如何动态设置 margin？

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);    
lp.setMargins(10, 20, 30, 40);    
imageView.setLayoutParams(lp);    

android中如何在代码中直接设置View的layout_weight属性

tvColu2.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT, 1.0f));