android 将文件 保存到sd卡 上面

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

public void save_sdcard(String fname,String fcontent) throws Exception{
File mf=new File(android.os.Environment.getExternalStorageDirectory(),fname);
FileOutputStream outfile=new FileOutputStream(mf);
outfile.write(fcontent.getBytes());
outfile.close();
}