从 java (android) 中的文件路径获取目录
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Get the directory from a file path in java (android)
提问by tru7
Is there a function to get the directory part of a file path?
是否有获取文件路径的目录部分的函数？
so from
所以从
String a="/root/sdcard/Pictures/img0001.jpg";
you get
你得到
"/root/sdcard/Pictures"
采纳答案by nanofarad
Yes. First, construct a Filerepresenting the image path:
是的。首先，构造一个File代表图片路径：
File file = new File(a);
If you're starting from a relative path:
如果您从相对路径开始：
file = new File(file.getAbsolutePath());
Then, get the parent:
然后，获取父级：
String dir = file.getParent();
Or, if you want the directory as a Fileobject,
或者，如果您希望目录作为File对象，
File dirAsFile = file.getParentFile();
回答by user370305
A better way, use getParent()from FileClass..
更好的方法，getParent()从FileClass使用..
String a="/root/sdcard/Pictures/img0001.jpg"; // A valid file path
File file = new File(a);
String getDirectoryPath = file.getParent(); // Only return path if physical file exist else return null
http://developer.android.com/reference/java/io/File.html#getParent%28%29
http://developer.android.com/reference/java/io/File.html#getParent%28%29
回答by winterDroid
You could also use FilenameUtils from Apache. It provides you at least the following features for the example C:\dev\project\file.txt:
您还可以使用Apache 的 FilenameUtils。它至少为示例 C:\dev\project\file.txt 提供了以下功能：
- the prefix - C:\
- the path - dev\project\
- the full path - C:\dev\project\
- the name - file.txt
- the base name - file
- the extension - txt
- 前缀 - C:\
- 路径 - dev\project\
- 完整路径 - C:\dev\project\
- 名称 - file.txt
- 基本名称 - 文件
- 扩展名 - txt
回答by Mahadev Mane
I have got solution on this after 4 days, Please note following points while giving path to File class in Android(Java):
我在 4 天后得到了解决方案，请注意以下几点，同时在 Android(Java) 中提供 File 类的路径：
- Use path for internal storage String path="/storage/sdcard0/myfile.txt";
- path="/storage/sdcard1/myfile.txt";
mention permissions in Manifest file.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />- First check file length for confirmation.
- Check paths in ES File Explorer regarding sdcard0 & sdcard1 is this same or else......
- 使用内部存储路径 String path="/storage/sdcard0/myfile.txt";
- path="/storage/sdcard1/myfile.txt";
在清单文件中提及权限。
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />- 首先检查文件长度进行确认。
- 检查 ES 文件资源管理器中关于 sdcard0 和 sdcard1 的路径是否相同，否则......
e.g.
例如
File file=new File(path);
long=file.length();//in Bytes
