控件的padding 是根据父级来定的 margin 是根据自身来定的

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