See the App Inventor Extensions document about how to use an App Inventor Extension.
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April 28th, 2017: Version 1: initial version
Nov 6th, 2018: Version 1a: fix for SDK26 release to avoid the Runtime error filename exposed beyond app through ClipData.Item.getUri() while sharing a file.
Required permissions: android.permission.READ_EXTERNAL_STORAGE
Note: This extension is a modified version of the Sharing component.
Set the default text of the sharing dialog. Default is 'Share using'.
Shares a message through any capable application installed on the phone by displaying a list of the available apps and allowing the user to choose one from the list. The selected app will open with the message inserted on it.
Shares both a file and a message through any capable application installed on the phone by displaying a list of available apps and allowing the user to choose one from the list. The selected app will open with the file and message inserted on it. Message also can be empty to send only a file without message. You can't share a file directly from the assets of your app.
Shares both a file and a message through Whatsapp without opening the app chooser. FileName or message also could be emtpy. You can't share a file directly from the assets of your app.
Tested successfully on Nexus 5X running Android 7.1.2, XORO-Tablet-Pad PAD 9720QR running Android 4.2.2, Samsung S5 running Android 6.01, Samsung S5 Neo running Android 6.01, Samsung S7 running Android 6.01 and Sony Xperia Z1 running Android 5.1.1. Thank you Marco for your tests.
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This work by Pura Vida Apps is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License
with attribution (name=Pura Vida Apps and link to the source site) required.