我要评论按文件名排序
/**
* 按文件名排序
* @param filepath
*/
public static arraylist<string> orderbyname(string filepath) {
arraylist<string> filenamelist = new arraylist<string>();
file file = new file(filepath);
file[] files = file.listfiles();
list filelist = arrays.aslist(files);
collections.sort(filelist, new comparator<file>() {
@override
public int compare(file o1, file o2) {
if (o1.isdirectory() && o2.isfile())
return -1;
if (o1.isfile() && o2.isdirectory())
return 1;
return o1.getname().compareto(o2.getname());
}
});
for (file file1 : files) {
if (file1.isdirectory()) {
filenamelist.add(file1.getname());
}
}
return filenamelist;
}
基于名称：
/**
* 按文件名排序
* @param filepath
*/
public static arraylist<string> orderbyname(string filepath) {
arraylist<string> filenamelist = new arraylist<string>();
file file = new file(filepath);
file[] files = file.listfiles();
list filelist = arrays.aslist(files);
collections.sort(filelist, new comparator<file>() {
@override
public int compare(file o1, file o2) {
if (o1.isdirectory() && o2.isfile())
return -1;
if (o1.isfile() && o2.isdirectory())
return 1;
return o1.getname().compareto(o2.getname());
}
});
for (file file1 : files) {
if (file1.isdirectory()) {
filenamelist.add(file1.getname());
}
}
return filenamelist;
}
基于最近修改时间：
/**
* 按文件修改时间排序
* @param filepath
*/
public static arraylist<string> orderbydate(string filepath) {
arraylist<string> filenamelist = new arraylist<string>();
file file = new file(filepath);
file[] files = file.listfiles();
arrays.sort(files, new comparator<file>() {
public int compare(file f1, file f2) {
long diff = f1.lastmodified() - f2.lastmodified();
if (diff > 0)
return 1;
else if (diff == 0)
return 0;
else
return -1;// 如果 if 中修改为 返回-1 同时此处修改为返回 1 排序就会是递减
}
public boolean equals(object obj) {
return true;
}
});
for (file file1 : files) {
if (file1.isdirectory()) {
filenamelist.add(file1.getname());
}
}
return filenamelist;
}
基于大小：
/**
* 按文件大小排序
* @param filepath
*/
public static arraylist<string> orderbysize(string filepath) {
arraylist<string> filenamelist = new arraylist<string>();
file file = new file(filepath);
file[] files = file.listfiles();
list<file> filelist = arrays.aslist(files);
collections.sort(filelist, new comparator<file>() {
public int compare(file f1, file f2) {
long s1 = getfoldersize(f1);
long s2 = getfoldersize(f2);
long diff = s1 - s2;
if (diff > 0)
return 1;
else if (diff == 0)
return 0;
else
return -1;// 如果 if 中修改为 返回-1 同时此处修改为返回 1 排序就会是递减
}
public boolean equals(object obj) {
return true;
}
});
for (file file1 : files) {
if (file1.isdirectory()) {
filenamelist.add(file1.getname());
}
}
return filenamelist;
}
/**
* 获取文件夹大小
* @param file file实例
* @return long
*/
public static long getfoldersize(file file) {
long size = 0;
try {
java.io.file[] filelist = file.listfiles();
for (int i = 0; i < filelist.length; i++) {
if (filelist[i].isdirectory()) {
size = size + getfoldersize(filelist[i]);
} else {
size = size + filelist[i].length();
}
}
} catch (exception e) {
e.printstacktrace();
}
return size;
}
总结
以上所述是小编给大家介绍的android 实现文件夹排序功能的实例代码，希望对大家有所帮助
如您对本文有疑问或者有任何想说的，请点击进行留言回复，万千网友为您解惑！
网友评论