在SD卡中写入文件

// create a File object for the parent directory

File fileDirectory = new File(Environment.getExternalStorageDirectory()+"/filexxxx"); 

 

// have the object build the directory structure, if needed.

fileDirectory.mkdirs();

 

File file = new File( fileDirectory.getAbsolutePath(),filename );

 

FileOutputStream fos = new FileOutputStream(file);