px转dp,dp转px

   /**
	     * dp转px
	     * @param context
	     * @param dp
	     * @return
	     */
	    public int Dp2Px(Context context, float dp) {   
		    final float scale = context.getResources().getDisplayMetrics().density;   
		    return (int) (dp * scale + 0.5f);   
		}   
	    /**
	     * px转dp
	     * @param context
	     * @param dp
	     * @return
	     */
		public int Px2Dp(Context context, float px) {   
		    final float scale = context.getResources().getDisplayMetrics().density;   
		    return (int) (px / scale + 0.5f);   
		}