dpi 与 px 的互相转换
public static int dip2px(Context context, float dipValue){
??????????????? final float scale = context.getResources().getDisplayMetrics().density;
??????????????? return (int)(dipValue * scale + 0.5f);
??????? }
???????
??? public static int px2dip(Context context, float pxValue){
??????????????? final float scale = context.getResources().getDisplayMetrics().density;
??????????????? return (int)(pxValue / scale + 0.5f);
??????? }?
