if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
File sdCardDir =
Environment.getExternalStorageDirectory();
//获取SDCard目录,2.2的时候为:/mnt/sdcard 2.1的时候为：/sdcard，所以使用静态方法得到路径会好一点。
File saveFile = new File(sdCardDir, "abc.txt");
FileOutputStream outStream = new FileOutputStream(saveFile);
outStream.write("你好".getBytes());
outStream.close(); }
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