com.hyphenate.chat.EMFileMessageBody.EMDownloadStatus 成员列表

成员的完整列表，这些成员属于 com.hyphenate.chat.EMFileMessageBody.EMDownloadStatus,包括所有继承而来的类成员

DOWNLOADING (定义于 com.hyphenate.chat.EMFileMessageBody.EMDownloadStatus)	com.hyphenate.chat.EMFileMessageBody.EMDownloadStatus
FAILED (定义于 com.hyphenate.chat.EMFileMessageBody.EMDownloadStatus)	com.hyphenate.chat.EMFileMessageBody.EMDownloadStatus
PENDING (定义于 com.hyphenate.chat.EMFileMessageBody.EMDownloadStatus)	com.hyphenate.chat.EMFileMessageBody.EMDownloadStatus
SUCCESSED (定义于 com.hyphenate.chat.EMFileMessageBody.EMDownloadStatus)	com.hyphenate.chat.EMFileMessageBody.EMDownloadStatus