android处理屏幕旋转
提取索爱导出的备份dbk文件里的通讯录
以前做1.5版本的程序，没有这个问题，2.2的版本用同样的代码一直写不了，纳闷。。
想起看程序权限时，都有写入文件的权限，所以估计是需要明确的权限。
引用一些别人的问题：
You're right that the SD Card directory is /sdcard but you shouldn't be hard coding it. Instead, make a call to Environment.getExternalStorageDirectory() to get the directory:
If you haven't done so already, you will need to give you app the correct permission to write to the SD Card by adding this to your Manifest:
from： http://stackoverflow.com/questions/2121833/permission-to-write-to-the-sd-card
原创内容如转载请注明：来自 阿权的书房
想起看程序权限时，都有写入文件的权限，所以估计是需要明确的权限。
引用一些别人的问题：
You're right that the SD Card directory is /sdcard but you shouldn't be hard coding it. Instead, make a call to Environment.getExternalStorageDirectory() to get the directory:
File sdDir = Environment.getExternalStorageDirectory();
If you haven't done so already, you will need to give you app the correct permission to write to the SD Card by adding this to your Manifest:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
from： http://stackoverflow.com/questions/2121833/permission-to-write-to-the-sd-card
原创内容如转载请注明：来自 阿权的书房
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brass casting 
2010/11/10 16:22
原来是权限惹得祸，谢谢博主提醒。
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