Develop Reference

FileNotFoundException when app is updated to Android 11+ MediaRecord.prepare(). "FileNotFoundException open failed: EPERM (Operation not permitted)"

When you install the app for the first time, it works normally without any problems.
However, if you update the app while the app is already installed, a problem occurs in api 30+ version.(current .apk, update .aab)
java.io.FileNotFoundException:/storage/emulated/0/Documents/xxxx/100536_20220503_092934_96001.mp4: open failed: EPERM (Operation not permitted)
at libcore.io.IoBridge.open(IoBridge.java:492)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:289)
at java.io.RandomAccessFile.<init>(RandomAccessFile.java:152)
at android.media.MediaRecorder.prepare(MediaRecorder.java:1417)
at xxxx.xxxx.com.xxxx.service.RecordService.onStart(RecordService.java:207)
at android.app.Service.onStartCommand(Service.java:505)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:4795)
at android.app.ActivityThread.access$2000(ActivityThread.java:301)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2215)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:246)
at android.app.ActivityThread.main(ActivityThread.java:8653)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
Caused by: android.system.ErrnoException: open failed: EPERM (Operation not permitted)
at libcore.io.Linux.open(Native Method)
at libcore.io.ForwardingOs.open(ForwardingOs.java:166)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:254)
at libcore.io.ForwardingOs.open(ForwardingOs.java:166)
at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:8514)
at libcore.io.IoBridge.open(IoBridge.java:478)
'''

How to make the Android plugin read a json file from Internal storage from Unity?

Im successful adding a desired json file to the internal storage of my app data/<packagename>/files/ .
What I want to achieve is, to make a function in my android plugin (inside Unity app) which can read the same json from internal storage. Im doubtful, if this is even possible at runtime. I tried this in my plugin contentprovider class String file_name=context.getFilesDir() + "/"+"stickers.json"; but my app crashes on device.
Second alternative which I thought is to pass the whole json object to Android plugin by using UnitySendMessage (I have never used it before).
I want the plugin to read the internally stored json because I can dynamically modify the json at runtime from unity and perform my desired functions from the android plugin code.
UPDATE
--------- beginning of crash
2020-05-30 14:09:32.275 22270-22270/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.Addy.Trace, PID: 22270
java.lang.RuntimeException: Unable to get provider com.plugin.unityapp.StickerContentProvider: java.lang.RuntimeException: contents.json file has some issues: /data/user/0/com.Addy.Trace/files/stickers.json: open failed: ENOENT (No such file or directory)
at android.app.ActivityThread.installProvider(ActivityThread.java:7416)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:6956)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6844)
at android.app.ActivityThread.access$1300(ActivityThread.java:268)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1982)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:7814)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1068)
Caused by: java.lang.RuntimeException: contents.json file has some issues: /data/user/0/com.Addy.Trace/files/stickers.json: open failed: ENOENT (No such file or directory)
at com.plugin.unityapp.StickerContentProvider.readContentFile(StickerContentProvider.java:164)
at com.plugin.unityapp.StickerContentProvider.getStickerPackList(StickerContentProvider.java:182)
at com.plugin.unityapp.StickerContentProvider.onCreate(StickerContentProvider.java:98)
at android.content.ContentProvider.attachInfo(ContentProvider.java:2113)
at android.content.ContentProvider.attachInfo(ContentProvider.java:2087)
at android.app.ActivityThread.installProvider(ActivityThread.java:7411)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:6956) 
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6844) 
at android.app.ActivityThread.access$1300(ActivityThread.java:268) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1982) 
at android.os.Handler.dispatchMessage(Handler.java:107) 
at android.os.Looper.loop(Looper.java:237) 
at android.app.ActivityThread.main(ActivityThread.java:7814) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1068) 
Caused by: java.io.FileNotFoundException: /data/user/0/com.Addy.Trace/files/stickers.json: open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:496)
at java.io.FileInputStream.<init>(FileInputStream.java:159)
at com.plugin.unityapp.StickerContentProvider.readContentFile(StickerContentProvider.java:156)
at com.plugin.unityapp.StickerContentProvider.getStickerPackList(StickerContentProvider.java:182) 
at com.plugin.unityapp.StickerContentProvider.onCreate(StickerContentProvider.java:98) 
at android.content.ContentProvider.attachInfo(ContentProvider.java:2113) 
at android.content.ContentProvider.attachInfo(ContentProvider.java:2087) 
at android.app.ActivityThread.installProvider(ActivityThread.java:7411) 
at android.app.ActivityThread.installContentProviders(ActivityThread.java:6956) 
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6844) 
at android.app.ActivityThread.access$1300(ActivityThread.java:268) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1982) 
at android.os.Handler.dispatchMessage(Handler.java:107) 
at android.os.Looper.loop(Looper.java:237) 
at android.app.ActivityThread.main(ActivityThread.java:7814) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1068) 
Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
at libcore.io.Linux.open(Native Method)
at libcore.io.ForwardingOs.open(ForwardingOs.java:167)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:252)
at libcore.io.ForwardingOs.open(ForwardingOs.java:167)
at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:7691)
at libcore.io.IoBridge.open(IoBridge.java:482)
at java.io.FileInputStream.<init>(FileInputStream.java:159) 
at com.plugin.unityapp.StickerContentProvider.readContentFile(StickerContentProvider.java:156) 
at com.plugin.unityapp.StickerContentProvider.getStickerPackList(StickerContentProvider.java:182) 
at com.plugin.unityapp.StickerContentProvider.onCreate(StickerContentProvider.java:98) 
at android.content.ContentProvider.attachInfo(ContentProvider.java:2113) 
at android.content.ContentProvider.attachInfo(ContentProvider.java:2087) 
at android.app.ActivityThread.installProvider(ActivityThread.java:7411) 
at android.app.ActivityThread.installContentProviders(ActivityThread.java:6956) 
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6844) 
at android.app.ActivityThread.access$1300(ActivityThread.java:268) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1982) 
at android.os.Handler.dispatchMessage(Handler.java:107) 
at android.os.Looper.loop(Looper.java:237) 
at android.app.ActivityThread.main(ActivityThread.java:7814) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1068) 
This is the crash log in LOGCAT of android studio. From unity in a script , im using the awake function and writing the json file to internal storage, but maybe during the startup of the app the plugin isnt detecting the json in internal storage using String file_name=context.getFilesDir() + "/"+"stickers.json";
JSON File content
{
"android_play_store_link": "",
"ios_app_store_link": "",
"sticker_packs": [
{
"identifier": "1",
"name": "Adi",
"publisher": "Jane Doe",
"tray_image_file": "Trayicon_Cat1.png",
"image_data_version":"1",
"avoid_cache":false,
"publisher_email":"",
"publisher_website": "",
"privacy_policy_website": "",
"license_agreement_website": "",
"stickers": [
{
"image_file": "Formidable.webp",
"emojis": ["☕","🙂"]
},
{
"image_file": "Awful.webp",
"emojis": ["😩","😰"]
},
{
"image_file": "Athletic.webp",
"emojis": ["☕","🙂"]
}
]
}
]
}

LocalFingerprints: cannot compute fingerprint

I am getting one strange error it occurs randomly to any time and crashes the app. i am testing on nexus 6 in Android 7.0
here is log cat
E/LocalFingerprints: cannot compute fingerprint for: content://media/external/images/media/306155
java.io.IOException: read failed: EISDIR (Is a directory)
at libcore.io.IoBridge.read(IoBridge.java:481)
at java.io.FileInputStream.read(FileInputStream.java:252)
at android.os.ParcelFileDescriptor$AutoCloseInputStream.read(ParcelFileDescriptor.java:889)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:273)
at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
at java.security.DigestInputStream.read(DigestInputStream.java:161)
at java.io.FilterInputStream.read(FilterInputStream.java:107)
at kei.b(PG:81)
at imp.a(PG:1324)
at ilf.a(PG:131)
at com.google.android.libraries.social.autobackup.FingerprintScannerIntentService.onHandleIntent(PG:81)
at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:67)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.os.HandlerThread.run(HandlerThread.java:61)
Caused by: android.system.ErrnoException: read failed: EISDIR (Is a directory)
at libcore.io.Posix.readBytes(Native Method)
at libcore.io.Posix.read(Posix.java:169)
at libcore.io.BlockGuardOs.read(BlockGuardOs.java:231)
at libcore.io.IoBridge.read(IoBridge.java:471)
at java.io.FileInputStream.read(FileInputStream.java:252) 
at android.os.ParcelFileDescriptor$AutoCloseInputStream.read(ParcelFileDescriptor.java:889) 
at java.io.BufferedInputStream.read1(BufferedInputStream.java:273) 
at java.io.BufferedInputStream.read(BufferedInputStream.java:334) 
at java.security.DigestInputStream.read(DigestInputStream.java:161) 
at java.io.FilterInputStream.read(FilterInputStream.java:107) 
at kei.b(PG:81) 
at imp.a(PG:1324) 
at ilf.a(PG:131) 
at com.google.android.libraries.social.autobackup.FingerprintScannerIntentService.onHandleIntent(PG:81) 
at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:67) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.os.HandlerThread.run(HandlerThread.java:61) 

File not found exception while downloading android expansion file

I'm creating a cordova plugin to download expansion files.
Currently, I'm implementing that the expansion files will be downloaded manually.
The request will be send, but I get the error
aborting request for download main.1000004.my.name.app.obb: while writing destination file: java.io.FileNotFoundException: /storage/emulated/0/Android/obb/my.name.app/main.1000004.my.name.app.obb.tmp: open failed: ENOENT (No such file or directory)
02-20 17:12:12.930 15355-15631/my.name.app W/System.err: com.google.android.vending.expansion.downloader.impl.DownloadThread$StopRequest: while writing destination file: java.io.FileNotFoundException: /storage/emulated/0/Android/obb/my.name.app/main.1000004.my.name.app.obb.tmp: open failed: ENOENT (No such file or directory)
W/System.err: at com.google.android.vending.expansion.downloader.impl.DownloadThread.writeDataToDestination(DownloadThread.java:515)
W/System.err: at com.google.android.vending.expansion.downloader.impl.DownloadThread.transferData(DownloadThread.java:350)
W/System.err: at com.google.android.vending.expansion.downloader.impl.DownloadThread.executeDownload(DownloadThread.java:308)
W/System.err: at com.google.android.vending.expansion.downloader.impl.DownloadThread.run(DownloadThread.java:236)
W/System.err: at com.google.android.vending.expansion.downloader.impl.DownloaderService.onHandleIntent(DownloaderService.java:1086)
W/System.err: at com.google.android.vending.expansion.downloader.impl.CustomIntentService$ServiceHandler.handleMessage(CustomIntentService.java:104)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:102)
W/System.err: at android.os.Looper.loop(Looper.java:148)
W/System.err: at android.os.HandlerThread.run(HandlerThread.java:61)
W/System.err: Caused by: java.io.FileNotFoundException: /storage/emulated/0/Android/obb/my.name.app/main.1000004.my.name.app.obb.tmp: open failed: ENOENT (No such file or directory)
W/System.err: at libcore.io.IoBridge.open(IoBridge.java:452)
W/System.err: at java.io.FileOutputStream.<init>(FileOutputStream.java:87)
W/System.err: at java.io.FileOutputStream.<init>(FileOutputStream.java:127)
W/System.err: at com.google.android.vending.expansion.downloader.impl.DownloadThread.writeDataToDestination(DownloadThread.java:496)
W/System.err: ... 8 more
W/System.err: Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
W/System.err: at libcore.io.Posix.open(Native Method)
W/System.err: at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
0W/System.err: at libcore.io.IoBridge.open(IoBridge.java:438)
Actually, my current main expansion version is 1000013. But it searches for 1000004. The content is the same, so it's not the problem.
The rights should be available
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
Any idea why this could happen?

I believe that this is happening because the Google Play Console does not have a correct expansion file associated with your current version code. Make sure that you uploaded and selected a correct expansion file along with your APK in Play Console.
If it doesn't help, check if your external storage can be mounted by calling Helpers.isExternalMediaMounted(). Your device may not have an SD card (emulator?). Additionally, you may want to check if your app has access to the OBB directory by calling Helpers.canWriteOBBFile(Context).
I recommend using the updated Downloader Library included in Better APK Expansion package. It has several issues fixed and also provides simplified API that minimizes chances to shoot yourself in the foot.

If you reach here and didn't find an answer then please try add this to Mainfests <application android:requestLegacyExternalStorage="true" ... >

Qt Android QGraphicsscene->AddPixmap does not work properly

I working on a project that listing an order from citizen include text and images.
I have encountered an awesome problem that Qgraphicsscene->addPixmap, sometimes works and sometimes it does not. I cannot detect what problem is.
QGraphicsPixmapItem* pItem;
pItem = scene->addPixmap(QPixmap::fromImage(img));
img is loaded properly and tested if it did not loaded.
When I Run Application Qt Creator output Below:
Starting remote process.E/Zygote (23262): MountEmulatedStorage()
E/Zygote (23262): v2
I/SELinux (23262): Function: selinux_compare_spd_ram, SPD-policy is existed. and_ver=SEPF_SM-A500F_4.4.4 ver=46
I/SELinux (23262): Function: selinux_compare_spd_ram , priority [2] , priority version is VE=SEPF_SM-A500F_5.0.2-1_0039
E/SELinux (23262): [DEBUG] get_category: variable seinfo: default sensitivity: NULL, cateogry: NULL
I/libpersona(23262): KNOX_SDCARD checking this for 10276
I/libpersona(23262): KNOX_SDCARD not a persona
I/ActivityManager( 1004): Start proc org.qtproject.serikbelediyesi for activity org.qtproject.serikbelediyesi/org.qtproject.qt5.android.bindings.QtActivity: pid=23262 uid=10276 gids={50276, 9997, 3003, 1028, 1015} abi=armeabi-v7a
D/TimaKeyStoreProvider(23262): TimaSignature is unavailable
D/ActivityThread(23262): Added TimaKeyStore provider
E/Qt (23262): Can't create main activity
E/Qt (23262): java.io.FileNotFoundException: /data/data/org.qtproject.serikbelediyesi/lib/libplugins_platforms_libqoffscreen.so: open failed: ENOENT (No such file or directory)
E/Qt (23262): at libcore.io.IoBridge.open(IoBridge.java:456)
E/Qt (23262): at java.io.FileInputStream.<init>(FileInputStream.java:76)
E/Qt (23262): at java.io.FileInputStream.<init>(FileInputStream.java:103)
E/Qt (23262): at org.qtproject.qt5.android.bindings.QtActivity.createBundledBinary(QtActivity.java:416)
E/Qt (23262): at org.qtproject.qt5.android.bindings.QtActivity.extractBundledPluginsAndImports(QtActivity.java:489)
E/Qt (23262): at org.qtproject.qt5.android.bindings.QtActivity.startApp(QtActivity.java:582)
E/Qt (23262): at org.qtproject.qt5.android.bindings.QtActivity.onCreate(QtActivity.java:895)
E/Qt (23262): at android.app.Activity.performCreate(Activity.java:6374)
E/Qt (23262): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
E/Qt (23262): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2752)
E/Qt (23262): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2873)
E/Qt (23262): at android.app.ActivityThread.access$900(ActivityThread.java:181)
E/Qt (23262): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1482)
E/Qt (23262): at android.os.Handler.dispatchMessage(Handler.java:102)
E/Qt (23262): at android.os.Looper.loop(Looper.java:145)
E/Qt (23262): at android.app.ActivityThread.main(ActivityThread.java:6145)
E/Qt (23262): at java.lang.reflect.Method.invoke(Native Method)
E/Qt (23262): at java.lang.reflect.Method.invoke(Method.java:372)
E/Qt (23262): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
E/Qt (23262): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
E/Qt (23262): Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
E/Qt (23262): at libcore.io.Posix.open(Native Method)
E/Qt (23262): at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
E/Qt (23262): at libcore.io.IoBridge.open(IoBridge.java:442)
E/Qt (23262): ... 19 more
D/PhoneWindow(23262): *FMB* installDecor mIsFloating : false

yes OK, Updrage your Qt Library to Qt 5.6 Release Candidate
I haven't found any solution yet. but i upgraded to Qt 5.6 Release Candidate, Any Problem Seeing. many times change my code and add some example code to my project, there is not any problem. libplugins_platforms_libqoffscreen.so
always creating and loding properly and QLabel or any QWidget show my pixmap.