引用：

LinearLayout.LayoutParams para=new LinearLayout.LayoutParams(

            LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT );

        para.setMargins(20, 20, 20, 20); //left,top,right, bottom

        para.gravity = Gravity.RIGHT;

        tv.setLayoutParams(para);

        tv.setBackgroundResource(R.drawable.icon);