android4.4 两个sdcard一个可以访问，另一个报无权限

Question

I/System.out( 922): mkdir failed: EACCES (Permission denied) path = /storage/sdcard1/com.ayst.healthkit

Answer 1

Android 4.4 取消了非内置应用的第二个及以上外置存储器的写权限，但是这个存储器有个目录除外.../Android/data/data/packe-name/

附上官方解释：
http://developer.android.com/intl/zh-cn/guide/topics/data/data-storage.html#filesExternal

Note: Beginning with Android 4.4, these permissions are not required if you're reading or writing only files that are private to your app. For more information, see the section below about saving files that are app-private.