dp与px之间的转换

private static float density = -1F;

    public static float getDensity(Context context) {
        if (density <= 0F) {
            density = context.getResources().getDisplayMetrics().density;
        }
        return density;
    }

    public static int dip2px(Context context, float dpValue) {
        return (int) (dpValue * getDensity(context) + 0.5F);
    }

    public static int px2dip(Context context, float pxValue) {
        return (int) (pxValue / getDensity(context) + 0.5F);
    }