问题描述
我有一个录制视频的应用，目前安装量约为 8 万次（下载量超过 10 万次），Crashlytics 统计数据似乎不错 - 无崩溃用户率为 99.66%，Google Play 评分也不错 - 4.5
但是对于我的一些用户来说仍然可能发生下一个错误（现在每个用户可能发生一次或几次，所以不经常，但仍然不时发生）：
java.io.FileNotFoundException: /storage/7886-1D16/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-03-18 21h 18m 06s.mp4：打开失败：EROFS ...等等等等... android.media.MediaRecorder.prepare(MediaRecorder.java:1028)
这是代码（类似于我项目中的真实代码），正如您在 mediaRecorder.prepare() 和视频录制之前看到的那样，我检查输出目录是否良好，如果 File.canWrite() 返回 true 然后这意味着文件存在，应用程序需要在此路径写入的权限，并且存储已挂载 https://developer.android.com/reference/java/io/File#canWrite()
// canWrite() - means that file exists and app is allowed to write
if (outputFolderFile.canWrite()) {
// directory is OK,Android says that there is nothing wrong...
val videoFile = File(outputFolderFile,videoFileName)
... // MediaRecorder settings
mediaRecorder.setoutputFile(videoFile.absolutePath)
... // other MediaRecorder settings
try {
mediaRecorder.prepare() // FileNotFoundException here from time to time
} catch (e: Exception) {
e.printstacktrace()
openReportErrorDialog(e)
}
}
此外，我试图将 && Environment.getExternalStorageState(outputFolderFile).equals(Environment.MEDIA_MOUNTED)) 或 || (outputFolderFile.mkdirs() && outputFolderFile.canWrite()) 添加到该条件 (outputFolderFile.canWrite()) 但没关系，错误仍然发生
我也试图在 createNewFile(videoFile ) 之前添加 mediaRecorder.prepare() 行但没有帮助，在这种情况下错误是 java.io.IOException: No such file or directory,java.io.IOException: No such file or directory at java.io.UnixFileSystem.createFileExclusively0(Native Method)
所以 Android 说该目录存在，一切正常，应用程序可以在那里写入文件，但是...
HUAWEI CAG-L22
java.io.FileNotFoundException: /storage/7886-1D16/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-03-18 21h 18m 06s.mp4: open Failed: EROFS (Read-only file system)
HUAWEI fig-LX1
java.io.FileNotFoundException: /storage/5309-1D08/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-04-10/2021-04-10 10h 17m 18s.mp4: open Failed: EROFS (Read-only file system)
LGE LG-K350
java.io.FileNotFoundException: /storage/4CA1-71F9/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-04-02/2021-04-02 14h 53m 31s.mp4: open Failed: ENOENT (No such file or directory)
LGE LM-K300
java.io.FileNotFoundException: /storage/C5F6-15E4/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-03-06/2021-03-06 02h 26m 40s PM.mp4: open Failed: ENOENT (No such file or directory)
LGE LM-X420
java.io.FileNotFoundException: /storage/B15A-170A/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-02-12/2021-02-12 13h 31m 42s.mp4: open Failed: ENOENT (No such file or directory)
OPPO CPH1931
java.io.FileNotFoundException: /storage/02EB-1B18/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-03-13/2021-03-13 12h 15m 30s.mp4: open Failed: EROFS (Read-only file system)
Prestigio PMT3257_3G
java.io.FileNotFoundException: /storage/emulated/0/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-04-10/2021-04-10 10h 32m 21s.mp4: open Failed: ENOENT (No such file or directory),samsung SM-G900F
java.io.FileNotFoundException: /storage/161A-0B3C/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-03-02/2021-03-02 08h 06m 33s.mp4: open Failed: ENOENT (No such file or directory)
samsung SM-N960W
java.io.FileNotFoundException: /storage/2A2C-40A4/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-04-14/2021-04-14 02h 35m 45s AM.mp4: open Failed: ENOENT (No such file or directory)
Xiaomi M2004J19C
java.io.FileNotFoundException: /storage/emulated/0/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-03-11 11h 09m 18s AM.mp4: open Failed: ENOENT (No such file or directory)
Xiaomi M2007J20CG
java.io.FileNotFoundException: /storage/82AD-49E3/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-04-06/2021-04-06 06h 51m 14s.mp4: open Failed: ENOENT (No such file or directory)
Xiaomi M2007J3SG
java.io.FileNotFoundException: /storage/emulated/0/Movies/MY_APP_NAME_HERE/2021-03-31/2021-03-31 15h 39m 27s.mp4: open Failed: EPERM (Operation not permitted)
Xiaomi M2007J3SY
java.io.FileNotFoundException: /storage/emulated/0/Movies/MY_APP_NAME_HERE/2021-04-10/2021-04-10 01h 30m 42s PM.mp4: open Failed: EPERM (Operation not permitted)
Xiaomi M2102J20SG
java.io.FileNotFoundException: /storage/emulated/0/Movies/MY_APP_NAME_HERE/2021-04-17/2021-04-17 16h 16m 59s.mp4: open Failed: EPERM (Operation not permitted)
Xiaomi POCO F2 Pro
java.io.FileNotFoundException: /storage/emulated/0/Movies/MY_APP_NAME_HERE/2021-02-05/2021-02-05 19h 20m 36s.mp4: open Failed: EPERM (Operation not permitted)
Xiaomi Redmi 5A
java.io.FileNotFoundException: /storage/577D-D95B/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-03-13/2021-03-13 16h 33m 21s.mp4: open Failed: EROFS (Read-only file system)
Xiaomi Redmi 7A
java.io.FileNotFoundException: /storage/4DC6-1515/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-03-12/2021-03-12 09h 18m 35s.mp4: open Failed: EIO (I/O error)
Xiaomi Redmi Note 8T
java.io.FileNotFoundException: /storage/A018-ED55/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-02-06/2021-02-06 17h 29m 59s.mp4: open Failed: EIO (I/O error)
ZTE A2017G
java.io.FileNotFoundException: /storage/emulated/0/Movies/MY_APP_NAME_HERE/2021-03-26/2021-03-26 08h 27m 42s.mp4: open Failed: ENOENT (No such file or directory)
所以它主要发生在小米设备上，主要是在录制到外部 micro SD 卡时（例如路径是 /storage/2A2C-40A4/***），但对于手机的内置存储（/storage/emulated/0/***），它有时也会发生...
Android 的版本不同，从 6（旧）到 11（最新），所以没关系。
您可以看到错误是相似的（以 FileNotFoundException 和文件绝对路径开头），但有时它会在末尾发生变化
open Failed: EROFS (Read-only file system)open Failed: ENOENT (No such file or directory)open Failed: EIO (I/O error)open Failed: EPERM (Operation not permitted)
我不知道为什么会这样。我无法在自己的设备（两台三星、一台联想、一台华为和一台小米设备）上重现此问题。
这可能是因为此时存储的读/写时间非常缓慢或冻结（存储控制器上的负载很重）并且 Android (MediaRecorder) 无法创建用于录制的输出视频文件？
有什么想法或解决方案吗？
附言错误的完整示例：
java.io.FileNotFoundException: /storage/5309-1D08/Android/media/MY_APP_PACKAGE_NAME_HERE/2021-04-10/2021-04-10 10h 17m 20s.mp4：打开失败：EROFS（只读文件系统）在 libcore.io.IoBridge.open(IoBridge.java:485) 在 java.io.RandomAccessFile.(RandomAccessFile.java:288) 在 java.io.RandomAccessFile.(RandomAccessFile.java:151) 在 android.hsm.HwMediaPermWrapper.setoutputFile(HwMediaPermWrapper.java:127) 在 android.media.MediaRecorder.prepare(MediaRecorder.java:1028)
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
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