Android Question How Intent Filters can read files on /data/data folder?

ivan.tellez · Nov 27, 2015

Yes, i already know, data/data/appname/files it can be readed only by the owner app or by any app with root.

BUT, this is actually not true, for example, the outlook app, when you open a email with attachments, this files are stores in a folder under file:///data/data/com.microsoft.office.outlook/

Then, a chooser will appear to open the file, for example, WPS office, and those apps CAN READ the file from the private data/data folder (you can click on file info to see the path)

So, I added the Intent Filter on my app to read XML files, and its working great for any location but /data/data.

This app worked with the hotmail app that saved the attacments on the publick doenloads folder.

When i click a XML file on the Outlook app, my app opens and the intent data is correct (file:///data/data/com.microsoft.office.outlook/app_1-1%253AKgDirMsBwsNWyd0aRctGLQ/SEP210905778.282.1.X.cfdi.xml), but the file.exists function returns false.

B4X:

Sub Activity_Resume
Dim XmlData As String
Dim XmlPath As String
Dim XmlFile As String

Dim In As Intent

    In = Activity.GetStartingIntent
    If In <> Null Then

        XmlData = In.GetData

         If XmlData <> Null Then
            XmlPath = XmlData.SubString2(0,XmlData.LastIndexOf("/"))
            XmlPath = XmlPath.Replace("file:///","")
             XmlFile = XmlData.SubString(XmlData.LastIndexOf("/")+1)
           
            If File.Exists(XmlPath, XmlFile) = True Then    
                Log(File.GetText(XmlPath, XmlFile))  'this works on otrher paths
            Else
                Log("ERROR")

        End If
     End If
End Sub

Any ideas on this?

thanks

Erel · Nov 29, 2015

It is not possible to open an internal file of another app.

It is possible that the email client implements a content provider and provides a mechanism to open a stream to that file.

ivan.tellez · Nov 29, 2015

Erel said:
It is not possible to open an internal file of another app.

Yea, its weird, for example, in the screenshot, the WPS office has the file open. It shows the data/data path, but if i close the file, the close the app, restar the phone, open wps and select the file again from "recent files", wps can open it again.

Same with the other apps, like solid explorer.

If outlook its implementing a content provider, can B4A implement the filter to pen this file? Is there an example to use the "content" scheme instead of the "file" in the
GetStartingIntent?

Thanks

Erel · Nov 30, 2015

Monitor the unfiltered logs and see which intent is being sent when you open the file.

ivan.tellez · Dec 1, 2015

Erel said:
Monitor the unfiltered logs and see which intent is being sent when you open the file.

In the logs I can only see this:

B4X:

findPreferredActivity: We found 1 PreferredActivities set, but no match
Adding preferred activity ComponentInfo{com.ioxsoft.cfdivalidadorplus/com.ioxsoft.cfdivalidadorplus.main} for user 0 :
  Action: "android.intent.action.VIEW"
  Category: "android.intent.category.DEFAULT"
  Type: "text/xml"

But this is the Intent Filter declared in the manifest

B4X:

AddActivityText(Main,
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/xml" />
</intent-filter>)

In the debug, after calling:

B4X:

In = Activity.GetStartingIntent

Looks like this:

Erel · Dec 1, 2015

My guess is that Outlook implements a content provider. Though I wasn't able to find any information about.

ivan.tellez · Dec 8, 2015

Hi @Erel

After lots of intents XD, finaly i could open the file.

But its kind strange, maybe a bug in B4A.

As you can see in the picture on my last post, the path in the mData of the intent has 2 different versions; encoded and decoded.

I was debugging and put manualy on the starting intent the decoded part:

B4X:

XmlPath = "data/data/com.microsoft.office.outlook/app_1-1%3At3iOwd16NDIx-oP-o6U3dg"
XmlFile = "A5192 06-12-15.xml"

When you use the XmlData = In.GetData, the intent returns a path based on the encoded, this fails.

So, I used the decoded path, and this way, the file oppens

(All the paths had a %, encoded as %25 )

Is this a Bug?

how can you get the decoded path?

I already tried:

B4X:

    XmlData = In.GetData
        Dim jo As JavaObject = In
        test1 = jo.RunMethod("getData", Null)
        test2 = jo.RunMethod("getDataString", Null)

Both return the encoded path

ivan.tellez · Dec 9, 2015

Well, adding this works on my device:

B4X:

Dim jo As JavaObject
jo.InitializeStatic("android.net.Uri")
XmlData = jo.RunMethod("decode", Array(XmlData))

Why the FILE operations did not work with the encoded path?

Erel · Dec 9, 2015

Because it was not a valid path string.

Android Question How Intent Filters can read files on /data/data folder?

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