Detecing file extension when receiving a binary file type

[realcr]

Hey, thank you for the work receive_sharing_intent! I am trying to use the "receive any file type" feature (Mentioned in issue #13) , but I am hitting some problems. It is possible that I do not use it correctly.

I am trying to have my application accept binary files with the ".invoice" extension, for example. It seems like I am able now to accept files, but I can not identify the *.invoice extension. This is an issue for me, because I also handle other incoming files with different extensions, like *.index and
*.relay, and I am left with no ability to distinguish between different file types.

Below you can see the relevant simplified dart code example. The AndroidManifest.xml file is also included below.

Dart code snippet:

    _streamSubs
        .add(ReceiveSharingIntent.getMediaStream().listen((List<SharedMediaFile> sharedMediaFiles) {
      /* ... Some checks here ... */

      // We received exactly one filePath:
      logger.w(
        'fileType = ${sharedMediaFiles[0].type}');
      logger.w(
        'filePath = ${sharedMediaFiles[0].path}');

    }, onError: (err) {
        /* .. error handling ... */
    }));

Output:

I/flutter (11804): ⚠️  main - fileType = SharedMediaType.FILE
I/flutter (11804): ⚠️  main - filePath = /data/user/0/org.freedomlayer.offset/cache/VID_1587811736322.bin

I was expecting to be able to deduce from either fileType or filePath the original shared file extension, but it seems like I can't identify the file extension. Is this something this receive_sharing_intent plans on supporting?

Contents of androidManifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.freedomlayer.offset">
    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
         calls FlutterMain.startInitialization(this); in its onCreate method.
         In most cases you can leave this as-is, but you if you want to provide
         additional functionality it is fine to subclass or reimplement
         FlutterApplication and put your custom class here. -->

    <uses-permission android:name="android.permission.INTERNET"/>
    <!-- When we used launchMode="singleTop", a new application instance was created when a file was shared with the application.
    Using launchMode="singleTask" instead seems to solve this issue -->
    <application
        android:name="io.flutter.app.FlutterApplication"
        android:label="Offset"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTask"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
            <!-- Handle file sharing intents -->
            <!-- See also: https://stackoverflow.com/questions/1733195/android-intent-filter-for-a-particular-file-extension -->
            <intent-filter>
                <action android:name="android.intent.action.SEND" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="*/*" />
                <data android:pathPattern=".*\\.(invoice|receipt|commit|friend|relay|index|rcard)" />
            </intent-filter>
        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
</manifest>

Possibly also related to issue: #51