我对 getExternalStorageDirectory ()
和 getExternalStorageState ()
之间的区别有点困惑。
对于 getExternalStorageState ()
,Android 文档说:
public static String getExternalStorageState ()
Gets the current state of the primary "external" storage device. See Also
getExternalStorageDirectory()
我会阅读这篇关于“外部”存储是否可用的文章,但它返回一个字符串。那么它是什么字符串呢?如果它是存储路径,那么它与 getExternalStorageDirectory()
有何不同,后者返回被视为“外部”存储的路径?如果不是路径,“状态”是什么?
有人可以澄清一下区别是什么,为什么你会使用一个而不是另一个?
最佳答案
来自 http://developer.android.com/reference/android/os/Environment.html 处的文档(请参阅顶部的常量部分):
String MEDIA_BAD_REMOVAL getExternalStorageState() returns MEDIA_BAD_REMOVAL if the media was removed before it was unmounted.
String MEDIA_CHECKING getExternalStorageState() returns MEDIA_CHECKING if the media is present and being disk-checked
String MEDIA_MOUNTED getExternalStorageState() returns MEDIA_MOUNTED if the media is present and mounted at its mount point with read/write access.
String MEDIA_MOUNTED_READ_ONLY getExternalStorageState() returns MEDIA_MOUNTED_READ_ONLY if the media is present and mounted at its mount point with read only access.
String MEDIA_NOFS getExternalStorageState() returns MEDIA_NOFS if the media is present but is blank or is using an unsupported filesystem
String MEDIA_REMOVED getExternalStorageState() returns MEDIA_REMOVED if the media is not present.
String MEDIA_SHARED getExternalStorageState() returns MEDIA_SHARED if the media is present not mounted, and shared via USB mass storage.
String MEDIA_UNMOUNTABLE getExternalStorageState() returns MEDIA_UNMOUNTABLE if the media is present but cannot be mounted.
String MEDIA_UNMOUNTED getExternalStorageState() returns MEDIA_UNMOUNTED if the media is present but not mounted.
它返回这些常量之一。
getExternalStorageDirectory()
返回设备的路径名。
关于java - getExternalStorageDirectory()和getExternalStorageState()的区别,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/18280351/