Android中關於ContentProvider類的getType()方法的理解

http://stackoverflow.com/questions/12297527/android-contentprovider-gettype-called-when-and-why

http://an-droid.diandian.com/post/2011-10-08/5638131

getType(Uri uri) will usually only be called after a call to ContentResolver#getType(Uri uri). It is used by applications (either other third-party applications, if your ContentProvider has been exported, or your own) to retrieve the MIME type of the given content URL. If your app isn't concerned with the data's MIME type, it's perfectly fine to simply have the method return null.