Android 提示：No such file or directory 没找到文件 目录

[xiaoluo900722]

我是Android的初学者，今天与到了问题说是：No such file or directory 没找到文件，目录,
一直提示在 public File createSDFile(String fileName)方法中的 f.createNewFile();
出错！
请大家帮帮忙，谢了！

package app.lwp.downUtils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.os.Environment;


public class DownUtil {
private String SDPath;

public String getSDPath() {
return SDPath;
}


public DownUtil() {
SDPath = Environment.getExternalStorageDirectory() + "/";
}


/*
* 在SD卡上创建新的文件夹
*/
public File createSDFile(String fileName) throws IOException {
File f = new File(SDPath + fileName);
System.out.println(f); // f的内容输出：/mnt/sdcard/xiao/aa.txt
f.createNewFile();
return f;
}


/*
* 在SD卡上创建新的目录
*/
public File createSDDir(String dirName) {
File fileDir = new File(SDPath + dirName);
fileDir.mkdirs();
System.out.println(fileDir);
return fileDir;
}


public boolean isFileExist(String name) {
File file = new File(SDPath + name);
return file.exists();
}


public File writeToSD(String path, String fileName, InputStream input) {
File file = null;
OutputStream out = null;

try {
createSDDir(path);
file = createSDFile(path + fileName); //这里错误了！
out = new FileOutputStream(file);
byte[] byt = new byte[4 * 1024];
while (input.read(byt) != -1) {
out.write(byt);
}
out.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (out != null)
out.close();
out = null;
} catch (IOException e) {
e.printStackTrace();
}
}
return file;
}
}

[fontlose]

AndroidManifest.xml下有没允许权限
manifest内加入
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

[xiaoluo900722]

上面的权限我配置了

[fontlose]

public File createSDFile(String fileName) throws IOException {
File f = new File(SDPath + fileName);
System.out.println(f); // f的内容输出：/mnt/sdcard/xiao/aa.txt
f.createNewFile();
return f;
}

怎么是fileName==xiao/aa.txt？
你用DDMS看看有没/mnt/sdcard/xiao这个目录

[xiaoluo900722]

还真是配置出错了 EXTERNAL 我打成了EXTERANL

[xinqiqi123]

出错的那一句加个正斜线试试：
file = createSDFile(path + "/" + fileName); //这里错误了！