Android Question SecurityException when reading file from external app

[Michael2150]

So I have 2 apps set up. One sending files and the other receiving the files. The app sending the files is written in Java, while the receiving end is written in B4a.
When trying to retrieving the file from the results I get a SecurityException.
Ive been stuck on this the past few days a bit of help would be appreciated.

The full Exception message:

Error occurred on line: 121 (DocScanUtils)
java.lang.SecurityException: Permission Denial: opening provider androidx.core.content.FileProvider from ProcessRecord{f732a21 8153:com.eureka.dispatchit/u0a155} (pid=8153, uid=10155) that is not exported from UID 10159
    at android.os.Parcel.createExceptionOrNull(Parcel.java:2373)
    at android.os.Parcel.createException(Parcel.java:2357)
    at android.os.Parcel.readException(Parcel.java:2340)
    at android.os.Parcel.readException(Parcel.java:2282)
    at android.app.IActivityManager$Stub$Proxy.getContentProvider(IActivityManager.java:5702)
    at android.app.ActivityThread.acquireProvider(ActivityThread.java:6813)
    at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2935)
    at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:2481)
    at android.content.ContentResolver.query(ContentResolver.java:1167)
    at android.content.ContentResolver.query(ContentResolver.java:1115)
    at android.content.ContentResolver.query(ContentResolver.java:1071)
    at anywheresoftware.b4a.objects.ContentResolverWrapper.Query(ContentResolverWrapper.java:49)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:348)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
    at anywheresoftware.b4j.object.JavaObject$1.invoke(JavaObject.java:238)
    at java.lang.reflect.Proxy.invoke(Proxy.java:1006)
    at $Proxy1.ResultArrived(Unknown Source)
    at anywheresoftware.b4a.BA$4.run(BA.java:585)
    at anywheresoftware.b4a.BA.setActivityPaused(BA.java:459)
    at com.eureka.dispatchit.home$ResumeMessage.run(home.java:313)
    at android.os.Handler.handleCallback(Handler.java:938)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:223)
    at android.app.ActivityThread.main(ActivityThread.java:7656)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

The sending part of the first app is as follows:

//Create response intent.
Intent outIntent = new Intent(ACTION_RETURN_DOCUMENT);

File pdfFile = scanResult.pdfFile;

//Build the response with the Uri for the pdf file created.
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N){
    String authority = BuildConfig.APPLICATION_ID + ".fileprovider";

    if (pdfFile != null) {
        Uri finalPDF = FileProvider.getUriForFile(this.context, authority, pdfFile);
        outIntent.putExtra(EXTRA_PDF_FILE_STREAM, finalPDF);
    }
} else {
    if (pdfFile != null) {
        outIntent.putExtra(EXTRA_PDF_FILE_STREAM,Uri.fromFile(pdfFile));
    }
}

outIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
outIntent.setFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

setResult(Activity.RESULT_OK,resultIntent);

finish();

While the receiving end written in B4a is as follows with comments noting what those values turn out to when debugging:

Private Sub ion_Event (MethodName As String, Args() As Object) As Object  
    Dim resultCode As Int = Args(0)
    Dim intent As Intent = Args(1)
       
    Log(intent) ''(Intent) Intent { act=com.eureka.documentscanner.RETURN_DOCUMENT flg=0x1 (has extras) }  
   
    Try
        If intent.HasExtra(EXTRA_PDF_FILE_STREAM) Then
            Dim pdfUri As String = UriUtils.getParcableExtra(intent,EXTRA_PDF_FILE_STREAM)
            Log(pdfUri) ''uri: "content://com.eureka.documentscanner.fileprovider/files/8591356a-df5d-4204-ab68-55defaaca1b4.pdf"
            Dim u As Uri
            u.Parse(pdfUri)
            Log(u)
           
            Dim cr As ContentResolver : cr.Initialize("cr")
            Dim cur As Cursor = cr.Query(u,Null,"",Null,"") ''CODE BREAKS HERE
            Log(cur)
        End If
    Catch
        Log(LastException)
    End Try
       
    Return Null
End Sub

 

[Erel]

Start with this example: [B4X] TextEditor - Save and load external files

 

[Michael2150]

Start with this example: [B4X] TextEditor - Save and load external files

I did try and implement the "CheckForReceivedFiles" method from the example into my own project, with no luck.

I still get the same exception message.

I guess a better question would be how do I go about creating an InputSream from the
"content://com.eureka.documentscanner.fileprovider/files/8591356a-df5d-4204-ab68-55defaaca1b4.pdf" uri received from the sender app. the way Im doing it currently is as follows:

    Try
        If intent.HasExtra(EXTRA_PDF_FILE_STREAM) Then
            Dim pdfUri As String = UriUtils.getParcableExtra(intent,EXTRA_PDF_FILE_STREAM)
            Log(pdfUri) ''content://com.eureka.documentscanner.fileprovider/files/732d44c4-6606-4e17-b805-ab8f4482b18c-enhanced.jpg
            Dim u As Uri
            u.Parse(pdfUri)
            Log(u)
            
            Dim cr As ContentResolver : cr.Initialize("cr")
            Dim cur As Cursor = cr.Query(u,Null,"",Null,"") ''java.lang.SecurityException: Permission Denial: opening provider androidx.core.content.FileProvider from ProcessRecord{afbc3b1 10092:com.eureka.dispatchit/u0a155} (pid=10092, uid=10155) that is not exported from UID 10159
            Log(cur)
        End If
    Catch
        Log(LastException)
    End Try

 

[Erel]

Your code is very different than the code in CheckForReceivedFiles. The code in that sub works.