px转dp 在java文件里设置margin

转自： http://www.maxiaoguo.com/shipin/344.html

density = mContext.getResources().getDisplayMetrics().density;

int   margin = (int) (density *3.5);

mHolder.playFist.setPadding(margin, margin, margin, margin);

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(width, width);

mHolder.playFist.setLayoutParams(lp);