来源: 互联网  发布时间: 2014-02-18

把图片的图标放小得到缩略图

int phSize;
float PIX_SCALE;
PIX_SCALE = this.getResources().getDisplayMetrics().density;
phSize = (PHO_DIP * (int) (PIX_SCALE + 0.5f));

public Drawable scale(File file) {
		BitmapFactory.Options opt = new BitmapFactory.Options();

		opt.inPreferredConfig = Bitmap.Config.RGB_565;
		opt.inJustDecodeBounds = true;
		BitmapFactory.decodeFile(file.getAbsolutePath(), opt);
		opt.inJustDecodeBounds = false;
		if (opt.outWidth > opt.outHeight) {
			opt.inSampleSize = opt.outWidth / phSize;
			;
		} else {
			opt.inSampleSize = opt.outHeight / phSize;
		}
		Bitmap b = BitmapFactory.decodeFile(file.getAbsolutePath(), opt);
		Drawable d = new BitmapDrawable(ManagerActivity.this.getResources(), b);
		return d;
	}

 

    

    来源: 互联网  发布时间: 2014-02-18

sort如何按指定的列排序
sort如何按指定的列排序
0000            27189           41925425
065f            15              41925425
0663            7               41925425
0675            5               41925425
0691            76              41925425
0693            2               41925425
06a7            82              41925425
06a9            58              41925425
06bf            68              41925425
06c1            56              41925425
06d7            145             41925425
06e1            127             41925425
06e3            230             41925425
06e5            7               41925425
06ef            48              41925425
06f1            463             41925425
06ff            3847            41925425
070b            2376            41925425
070d            3408            41925425
0713            109025          41925425
0715            4               41925425
0726            134             41925425
我想按第二列值进行排序，从大到小的顺序。
看了下man,还是不大明白，还请大家指点一二。



答案：sort -n -k2 file.txt 或则sort -g -k2 file.txt

-n, --numeric-sort        

-g, --general-numeric-sort






用法：sort [选项]... [文件]...
Write sorted concatenation of all FILE(s) to standard output.

长选项必须用的参数在使用短选项时也是必须的。
顺序选项：

  -b, --ignore-leading-blanks  ignore leading blanks
  -d, --dictionary-order      consider only blanks and alphanumeric characters
  -f, --ignore-case           fold lower case to upper case characters
  -g, --general-numeric-sort  compare according to general numerical value
  -i, --ignore-nonprinting    consider only printable characters
  -M, --month-sort            compare (unknown) < `JAN' < ... < `DEC'
  -n, --numeric-sort          compare according to string numerical value
  -r, --reverse               reverse the result of comparisons

Other options:

  -c, --check               check whether input is sorted; do not sort
  -k, --key=POS1[,POS2]     start a key at POS1, end it at POS2 (origin 1)
  -m, --merge               merge already sorted files; do not sort
  -o, --output=FILE         write result to FILE instead of standard output
  -s, --stable              stabilize sort by disabling last-resort comparison
  -S, --buffer-size=SIZE    use SIZE for main memory buffer
  -t, --field-separator=SEP  use SEP instead of non-blank to blank transition
  -T, --temporary-directory=DIR  use DIR for temporaries, not $TMPDIR or /tmp;
                              multiple options specify multiple directories
  -u, --unique              with -c, check for strict ordering;
                              without -c, output only the first of an equal run
  -z, --zero-terminated     end lines with 0 byte, not newline
      --help     显示此帮助信息并退出
      --version  输出版本信息并退出

POS is F[.C][OPTS], where F is the field number and C the character position
in the field.  OPTS is one or more single-letter ordering options, which
override global ordering options for that key.  If no key is given, use the
entire line as the key.

SIZE may be followed by the following multiplicative suffixes:
% 1% of memory, b 1, K 1024 (default), and so on for M, G, T, P, E, Z, Y.

With no FILE, or when FILE is -, read standard input.

*** WARNING ***
The locale specified by the environment affects sort order.
Set LC_ALL=C to get the traditional sort order that uses
native byte values.

请向 <bug-coreutils@gnu.org> 报告错误。

    

    来源: 互联网  发布时间: 2014-02-18

类似ViewFlipper的AwesomePager组件


效果图先贴上来,可以实现类似图片浏览的一个效果组件;