当获取不到 文件大小的时候，暂停下载多次调用，getSofar()会下载远超文件实际大小（比如200多M的文件，getSofar会达到1g，多次暂停 会越来越大）。日志如下

链接：http://sdkup.mengjitv.com/download/parse?p=L2Fway9tZW5naml0di94c3hqbDIveHN4amwyLmFwaw%3D%3D&ext=236-0&type=1&v=2
看日志大小已经返回有394536861字节了，该文件实际大小才284164096字节，具体日志如下

13915-13915/com.shanling.mwzs D/FileDownloader.DownloadTask: setPath /storage/emulated/0/mwzs/apk/像素小精灵2-送百充百抽.apk
2020-05-25 10:22:26.531 13915-13915/com.shanling.mwzs D/FileDownloader.DownloadTask: setListener com.shanling.mwzs.ui.download.DownloadManager$downloadListener$1@434ed9c
2020-05-25 10:22:26.531 13915-13915/com.shanling.mwzs V/FileDownloader.DownloadTaskHunter: call start Url[http://sdkup.mengjitv.com/download/parse?p=L2Fway9tZW5naml0di94c3hqbDIveHN4amwyLmFwaw%253D%253D&ext=236-0&type=1&v=2], Path[/storage/emulated/0/mwzs/apk/像素小精灵2-送百充百抽.apk] Listener[com.shanling.mwzs.ui.download.DownloadManager$downloadListener$1@434ed9c], Tag[null]
2020-05-25 10:22:26.533 13915-13915/com.shanling.mwzs V/FileDownloader.DownloadTaskHunter: the task[1112546232] has been into the launch pool.
2020-05-25 10:22:26.534 13915-15044/com.shanling.mwzs V/FileDownloader.FileDownloadEventPool: setListener event.service.connect.changed
2020-05-25 10:22:26.535 13915-15044/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify begin 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a
2020-05-25 10:22:26.535 13915-15044/com.shanling.mwzs V/FileDownloader.DownloadTaskHunter: filedownloader:lifecycle:start com.liulishuo.filedownloader.DownloadTaskHunter@41ab72b by 11
2020-05-25 10:22:26.535 13915-15044/com.shanling.mwzs V/FileDownloader.FileDownloadList: add list in all 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 11 1
2020-05-25 10:22:26.536 13915-15044/com.shanling.mwzs D/FileDownloader.FileDownloadManager: request start the task with url(http://sdkup.mengjitv.com/download/parse?p=L2Fway9tZW5naml0di94c3hqbDIveHN4amwyLmFwaw%253D%253D&ext=236-0&type=1&v=2) path(/storage/emulated/0/mwzs/apk/像素小精灵2-送百充百抽.apk) isDirectory(FALSE)
2020-05-25 10:22:26.542 13915-15044/com.shanling.mwzs D/FileDownloader.FileDownloadUtils: can't continue 1112546232 file not suit, exists[FALSE], directory[FALSE]
2020-05-25 10:22:26.552 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[11] new[1] 1
2020-05-25 10:22:26.553 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify pending 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a
2020-05-25 10:22:26.555 13915-15046/com.shanling.mwzs D/FileDownloader.DownloadMgrInitialParams: initial FileDownloader manager with the customize connection creator: com.shanling.mwzs.ui.download.SLDownloadConnection$Creator@17ce7d2
2020-05-25 10:22:26.555 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:26.555 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[1] new[6] 1
2020-05-25 10:22:26.556 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify started 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a
2020-05-25 10:22:26.556 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:26.557 13915-15046/com.shanling.mwzs I/download_header: name:User-Agent;value:FileDownloader/1.7.7
2020-05-25 10:22:26.557 13915-15046/com.shanling.mwzs D/FileDownloader.ConnectTask: <---- 1112546232 request header {Range=[bytes=0-0], User-Agent=[FileDownloader/1.7.7]}
2020-05-25 10:22:26.745 13915-15046/com.shanling.mwzs D/FileDownloader.ConnectTask: ----> 1112546232 response header {null=[HTTP/1.1 200 OK], Accept-Ranges=[bytes], Access-Control-Allow-Credentials=[true], Access-Control-Allow-Origin=[], Age=[433623], Connection=[keep-alive], Content-Disposition=[attachment;filename=xsxjl2_236-0.apk], Content-Type=[application/octet-stream;charset=utf-8], Date=[Mon, 25 May 2020 02:22:22 GMT], Ohc-Cache-HIT=[fzctcache65 [4], qdix216 [1]], Ohc-File-Size=[-1], Server=[JSP3/2.0.14], Timing-Allow-Origin=[], Transfer-Encoding=[chunked], X-Android-Received-Millis=[1590373346744], X-Android-Response-Source=[NETWORK 200], X-Android-Selected-Protocol=[http/1.1], X-Android-Sent-Millis=[1590373346726]}
2020-05-25 10:22:26.745 13915-15046/com.shanling.mwzs W/FileDownloader.FileDownloadUtils: don't get instance length fromContent-Range header
2020-05-25 10:22:26.745 13915-15046/com.shanling.mwzs D/FileDownloader.FileDownloadUtils: etag find null for task(1112546232)
2020-05-25 10:22:26.746 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[6] new[2] 1
2020-05-25 10:22:26.746 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify connected 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a
2020-05-25 10:22:26.746 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:26.848 13915-15046/com.shanling.mwzs D/FileDownloader.FileDownloadUtils: can't continue 1112546232 file not suit, exists[FALSE], directory[FALSE]
2020-05-25 10:22:26.849 13915-15046/com.shanling.mwzs I/download_header: name:User-Agent;value:FileDownloader/1.7.7
2020-05-25 10:22:26.850 13915-15046/com.shanling.mwzs D/FileDownloader.ConnectTask: <---- 1112546232 request header {Range=[bytes=0-], User-Agent=[FileDownloader/1.7.7]}
2020-05-25 10:22:26.971 13915-15046/com.shanling.mwzs D/FileDownloader.ConnectTask: ----> 1112546232 response header {null=[HTTP/1.1 200 OK], Accept-Ranges=[bytes], Access-Control-Allow-Credentials=[true], Access-Control-Allow-Origin=[], Age=[433624], Connection=[keep-alive], Content-Disposition=[attachment;filename=xsxjl2_236-0.apk], Content-Type=[application/octet-stream;charset=utf-8], Date=[Mon, 25 May 2020 02:22:23 GMT], Ohc-Cache-HIT=[fzctcache65 [4], qdix216 [1]], Ohc-File-Size=[-1], Server=[JSP3/2.0.14], Timing-Allow-Origin=[], Transfer-Encoding=[chunked], X-Android-Received-Millis=[1590373346970], X-Android-Response-Source=[NETWORK 200], X-Android-Selected-Protocol=[http/1.1], X-Android-Sent-Millis=[1590373346922]}
2020-05-25 10:22:26.972 13915-15046/com.shanling.mwzs D/FileDownloader.DownloadRunnable: the connection[-1] for 1112546232, is connected range[0, -1) current offset[0] with code[200]
2020-05-25 10:22:26.974 13915-15046/com.shanling.mwzs D/FileDownloader.FetchDataTask: start fetch(-1): range [0, -1), seek to[0]
2020-05-25 10:22:26.974 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:26.974 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress update model's status with progress
2020-05-25 10:22:26.974 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:26.975 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[2] new[3] 1
2020-05-25 10:22:26.975 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 885 -1
2020-05-25 10:22:26.975 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:26.987 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:26.987 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:26.988 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:26.990 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 20805 -1
2020-05-25 10:22:26.990 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:26.998 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:26.998 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:26.999 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:26.999 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 40725 -1
2020-05-25 10:22:26.999 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.008 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.009 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.009 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.009 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 60637 -1
2020-05-25 10:22:27.009 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.018 13915-15046/com.shanling.mwzs D/FileDownloader.FetchDataTask: require flushAndSync id[1112546232] index[-1] offset[65949], consume[5]
2020-05-25 10:22:27.018 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.018 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.019 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.019 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 70045 -1
2020-05-25 10:22:27.019 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.029 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.029 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.029 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.030 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 100581 -1
2020-05-25 10:22:27.030 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.040 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.040 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.040 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.040 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 121717 -1
2020-05-25 10:22:27.041 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.049 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.049 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.050 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.050 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 148269 -1
2020-05-25 10:22:27.050 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.060 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.060 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.062 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.063 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 177477 -1
2020-05-25 10:22:27.063 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.071 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.071 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.072 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.072 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 208125 -1
2020-05-25 10:22:27.072 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.081 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.081 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.082 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.082 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 243981 -1
2020-05-25 10:22:27.082 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.092 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.092 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.092 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.092 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 271853 -1
2020-05-25 10:22:27.092 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.104 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.105 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.105 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.105 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 310764 -1
2020-05-25 10:22:27.105 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.116 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.116 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.116 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.116 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 352732 -1
2020-05-25 10:22:27.116 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.131 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.131 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.131 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.132 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 379292 -1
2020-05-25 10:22:27.132 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.147 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.147 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.147 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.148 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 447012 -1
2020-05-25 10:22:27.148 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.159 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.159 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.160 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.160 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 525348 -1
2020-05-25 10:22:27.160 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.171 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.171 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.171 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.171 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 605132 -1
2020-05-25 10:22:27.171 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.180 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.180 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.180 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.181 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 636995 -1
2020-05-25 10:22:27.181 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.190 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.191 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.192 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.192 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 736748 -1
2020-05-25 10:22:27.192 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.200 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.200 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.200 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.201 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 836155 -1
2020-05-25 10:22:27.201 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.210 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.210 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.211 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.211 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 925010 -1
2020-05-25 10:22:27.211 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.221 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.221 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.221 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.221 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 986402 -1
2020-05-25 10:22:27.221 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.230 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.230 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.231 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.231 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 1127145 -1
2020-05-25 10:22:27.231 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.243 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.244 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.252 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.253 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 1152153 -1
2020-05-25 10:22:27.253 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.253 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.253 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.254 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.254 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 1156249 -1
2020-05-25 10:22:27.254 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.263 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.263 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.264 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.264 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 1266823 -1
2020-05-25 10:22:27.264 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.273 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.273 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.274 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.274 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 1389677 -1
2020-05-25 10:22:27.274 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.283 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.284 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.284 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:22:27.284 13915-15045/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@939637a 1596898 -1
2020-05-25 10:22:27.284 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:22:27.298 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:22:27.298 13915-15046/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:22:27.299 13915-15045/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1

2020-05-25 10:31:00.797 13915-15814/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:31:00.797 13915-15630/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:31:00.797 13915-15630/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@49fb0fc 394427423 -1
2020-05-25 10:31:00.797 13915-15630/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow
2020-05-25 10:31:00.806 13915-15814/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: inspectNeedCallbackToUser need callback to user
2020-05-25 10:31:00.806 13915-15814/com.shanling.mwzs I/FileDownloader.DownloadStatusCallback: handleProgress notify user progress status
2020-05-25 10:31:00.806 13915-15630/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: ~~~callback 1112546232 old[3] new[3] 1
2020-05-25 10:31:00.806 13915-15630/com.shanling.mwzs D/FileDownloader.FileDownloadMessenger: notify progress 1112546232@com.liulishuo.filedownloader.DownloadTask@49fb0fc 394536861 -1
2020-05-25 10:31:00.806 13915-15630/com.shanling.mwzs D/FileDownloader.MessageSnapshotGate: updateKeepFlow

Start by tracing getSofar() through DownloadRunnable, FetchDataTask, and DownloadStatusCallback when the response reports an unknown size (-1). Reproduce repeated pause and resume with the logged chunked response, then verify that the reported downloaded bytes do not exceed the actual file size.