排序
Android 文件浏览器中涉及到文件按照文件名称、文件大小、修改时间 ，记录其排序算法如下，方便日后简单修改参考使用：
/**
* sort file
*
* @param fileList // file list
* @param sortMethod 「名称、大小、时间」
* @param MA 「Context」
* @return List<File>
*/public static List<File> sortFile(List<File> fileList, final String sortMethod, final CommonActivity MA) {
Collections.sort(fileList, new Comparator<File>() { @Override
public int compare(File object1, File object2) { return compareFile(object1, object2, sortMethod, MA);
}
}); return fileList;
}/**
* A local file, mount the directory to sort the files to achieve CNcomment:
* 本地文件，挂载目录文件排序实现
*
* @param object1
* @param object2
* @param sortMethod
* @param MA
* @return
*/public static int compareFile(File object1, File object2,
String sortMethod, CommonActivity MA) {
mx = MA; if (sortMethod.equals(mx.getResources().getString(R.string.file_name))) { return compareByName(object1, object2);
} else if (sortMethod.equals(mx.getResources().getString(
R.string.file_size))) { int len = compareBySize(object1.length(), object2.length()); // the same size ,sort by name
if (len == 0) { return compareByName(object1, object2);
} else { return compareBySize(object1.length(), object2.length());
}
} else if (sortMethod.equals(mx.getResources().getString(
R.string.update_time))) { int len = compareByDate(object1.lastModified(),
object2.lastModified()); // the same data ,sort by name
if (len == 0) { return compareByName(object1, object2);
} else { return compareByDate(object1.lastModified(),
object2.lastModified());
}
} return 0;
}/**
* sort according to file name
*
* @param object1
* @param object2
* @return
*/private static int compareByName(File object1, File object2) {
String objectName1 = object1.getName().toLowerCase();
String objectName2 = object2.getName().toLowerCase(); int result = objectName1.compareTo(objectName2); if (result == 0) { return 0;
} else if (result < 0) { return -1;
} else { return 1;
}
}/**
* sort according to file size
*
* @param object1
* @param object2
* @return
*/private static int compareBySize(long object1, long object2) { long diff = object1 - object2; if (diff > 0) { return 1;
} else if (diff == 0) { return 0;
} else { return -1;
}
}/**
* file sorted by date modified
*
* @param object1
* @param object2
* @return
*/public static int compareByDate(long object1, long object2) { long diff = object1 - object2; if (diff > 0) { return 1;
} else if (diff == 0) { return 0;
} else { return -1;
}
}
作者：DB_Liu
链接：https://www.jianshu.com/p/3eebe555d26a
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