Android Question URI content://com.android ... to real file

[Gregg Homan]

Hello,

Can someone explain to me why GetPathFromContentResult(UriString As String) is crashing (see code below) when trying to convert content://com.android... uri format into a real files?

http://www.b4x.com/android/forum/threads/uri-content-media-to-real-file.13473/#post-76176 explains how to use GetPathFromContentResult() to convert content://media... uri format into a real file.

I am using ContentChooser to select the same exact image via three different choices: Gallery, Photos and Images. The result from ContentChooser when opening a test image with Gallery and Photo is content://media/external/images/media/7567. The result from ContentChooser when opening same test image with Images is content://com.android.providers.media.documents/document/image%3A7567. GetPathFromContentResult() was able to convert content://media/external/images/media/7567 to /storage/emulated/0/DCIM/FrontCam/A12610.jpg. However, GetPathFromContentResult() crashes (see code below) when trying to convert content://com.android.providers.media.documents/document/image%3A7567

Thanks,
Gregg

Sub GetPathFromContentResult(UriString As String) As String
  If UriString.StartsWith("/") Then Return UriString 'If the user used a file manager to choose the image
  Dim Proj() As String
  Proj = Array As String("_data")
  Dim Cursor As Cursor    'GGH 01-05-13, Requires Lib SQL (version 1.20)
  Dim r As Reflector
  Dim Uri As Object
  Uri = r.RunStaticMethod("android.net.Uri", "parse", _
      Array As Object(UriString), _
      Array As String("java.lang.String"))
  r.Target = r.GetContext
  r.Target = r.RunMethod("getContentResolver")
 
  'FAILS ON NEXT LINE WHEN PROCESSES content://com.android... format
  Cursor = r.RunMethod4("query", _
  Array As Object(Uri, Proj, Null, Null, Null), _
  Array As String("android.net.Uri", _
      "[Ljava.lang.String;", "java.lang.String", _
      "[Ljava.lang.String;", "java.lang.String"))
 
  Cursor.Position = 0
  Dim res As String
  res = Cursor.GetString("_data")
  Cursor.Close
  Return res
End Sub

Here is the error message that code above throws when it tries to process a content://com.android... uri format:

java.lang.SecurityException: Permission Denial: reading com.android.providers.media.MediaDocumentsProvider uri content://com.android.providers.media.documents/document/image%3a7567 from pid=10761, uid=10229 requires android.permission.MANAGE_DOCUMENTS, or grantUriPermission()
    at android.os.Parcel.readException(Parcel.java:1461)
    at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:185)
    at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:137)
    at android.content.ContentProviderProxy.query(ContentProviderNative.java:413)
    at android.content.ContentResolver.query(ContentResolver.java:461)
    at android.content.ContentResolver.query(ContentResolver.java:404)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.agraham.reflection.Reflection.runmethod(Reflection.java:216)
    at anywheresoftware.b4a.agraham.reflection.Reflection.RunMethod4(Reflection.java:857)
    at Ovinion.Ovinion.main._getpathfromcontentresult(main.java:3156)
    at Ovinion.Ovinion.main._chooser_result(main.java:1845)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:173)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:157)
    at anywheresoftware.b4a.phone.Phone$ContentChooser$1.ResultArrived(Phone.java:843)
    at anywheresoftware.b4a.BA$4.run(BA.java:477)
    at anywheresoftware.b4a.BA.setActivityPaused(BA.java:388)
    at Ovinion.Ovinion.main$ResumeMessage.run(main.java:252)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:5083)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
    at dalvik.system.NativeStart.main(Native Method)

I also tried adding following code to the Manifest file but it does not stop above error from occurring:

AddPermission("android.permission.MANAGE_DOCUMENTS")

Also, I am not sure how to implement grantUriPermission() via code or manifest file as suggested on first line of the above error.

 

[Erel]

You can use this updated code: http://www.b4x.com/android/forum/threads/using-photos-from-the-phone.37444/#post-221367