Android: fix sharing a single file

[roman-r-m]

This is a follow-up to my previous PR #968 - looks like I have introduced a bug there.
According to the official dev guide we only need to set the type, and the URI goes to EXTRA_STREAM.

Without this change if I share a file to, say Gmail, I get a new email with the subject containing the URI which is clearly wrong. After the fix, as expected, I get a new email with the file attached.

Fixes #976

[MateusAndrade]

Thanks!

[MateusAndrade]

🎉 This PR is included in version 5.1.5 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[yfunk]

@roman-r-m @MateusAndrade It seems like this PR introduced a regression of the fix in the previous PR #968.

I was getting the SecurityException on v6.3.0 and found the previous PR during troubleshooting. I then downgraded the library v5.1.3 (where the first previous PR was added) and the error was gone. After upgrading to v5.1.5 (next change to android/src/main/java/cl/json/social/ShareIntent.java) which added this PR the error was getting thrown again.

2021-07-19 16:09:51.019 7918-7942/com.myapp E/DatabaseUtils: Writing exception to parcel
    java.lang.SecurityException: Permission Denial: reading cl.json.RNShareFileProvider uri content://com.myapp.rnshare.fileprovider/rnshare2/export/test.zip from pid=314, uid=1000 requires the provider be exported, or grantUriPermission()
        at android.content.ContentProvider.enforceReadPermissionInner(ContentProvider.java:729)
        at android.content.ContentProvider$Transport.enforceReadPermission(ContentProvider.java:602)
        at android.content.ContentProvider$Transport.query(ContentProvider.java:231)
        at android.content.ContentProviderNative.onTransact(ContentProviderNative.java:104)
        at android.os.Binder.execTransactInternal(Binder.java:1021)
        at android.os.Binder.execTransact(Binder.java:994)

Although I didn't notice any issues related to sharing with a Base64 image or ~250MB zip archive. The same issue occurred over at flutter_share, here's how they fixed it.

Environment:

react-native: 0.64.2
react-native-share: 5.1.5 - 6.3.0

minSdkVersion = 21
compileSdkVersion = 30
targetSdkVersion = 30

Tested on Emulator (API 29) and Samsung Galaxy M20 (API 29)