px dp 互转

 /**
  *
  *   px   dip 转换
  */
 public class DensityUtil {

     /**
      *   根据手机分辨率  dip 转 px
      */
     static  public  int dip2px(Context context,float dpValue){
         final  float scale = context.getResources().getDisplayMetrics().density;
         return  (int) (dpValue*scale+0.5f);
     }
     /**
      *   根据手机分辨率  px 转 dip
      */
     static  public  int px2dip(Context context, float pxValue){
         final  float scale = context.getResources().getDisplayMetrics().density;
         return  (int)(pxValue/scale+0.5f);
     }
 }