Whatsapp is not installed, Activity Starter Resolve Activity method returns empty string

[Edward_Kang]

[Anke]

Which Android version?
Connect your device to Companion make a right mouse click on this block:

"Do it" and post the result.

See also here (point 4):

How to ask a question (open new topic)

and here:

No results on Android11 ResolveActivity from ActivityStarter

Yes, on devices with Android 11 .ResolveActivity is an empty string. However, there is no need to check this as every device has an MP3 (audio) player. Android 9 (above) Android 11 (below): [grafik]

ActivityStarter1.ResolveActivity always returns an empty string in Android 11

Yes, also on Android 12. But it returns an empty string: [grafik]

[Taifun]

does the example project work for you?
you can download it here App Inventor Code Snippets | Pura Vida Apps

Taifun

[Edward_Kang]

This is the error message. How does it resolve this error? I am using android version 10.

[Taifun]

@Edward_Kang

This is the error message. How does it resolve this error? I am using android version 10

you forgot to answer this question

@Taifun

does the example project work for you?
you can download it here App Inventor Code Snippets | Pura Vida Apps

Taifun

[Edward_Kang]

Hi Taifun, My codes are the same as the example project. I checked each line against the example project and they are exactly the same. The "call activitiystarter1. resolveactivity still returns an empty string and as the result, my app displayed the message "WhatsApp is not installed" text. From what I have read online and the material provided from the reply, it seems that this is caused by android 10. An update on the version could be the cause. Submitted for your advice, please.

[Taifun]

I now tested example 2 on an Android 11 device and can confirm the issue...
I also tested example 1 to open WhatsApp, this still works after ignoring the ResolveActivity method

there already is a bug report here

ActivityStarter1.ResolveActivity always returns an empty string in Android 11

I have two AI2 apps (ie app A and app B). Shortly after startup, app A looks to see if app B is installed (not running, just installed). If app B is not installed, a particular tinyDB tag is set to '5'. If app B is installed, that same tinyDB tag is set to '0'. [blocks] App A never, ever, ever needs to start app B. App A only needs to know that app B is installed. My search of forum topics indicated that in Android 11, ActivityStarter1.ResolveActivity always returns an empty string (in m…

try the sharing extension and its Whatsapp method...

App Inventor Extensions: Sharing | Pura Vida Apps

I just tested it... however it works for Whatsapp text messages only...
for files I get a notifier "data format is not supported"... it looks like I will have to take a look...

there are also other Whatsapp extensions available... you can find them after doing a search in the extensions directory here App Inventor Extensions | Pura Vida Apps

Taifun

[Edward_Kang]

Hi Taifun, May I know if there is another way to code without using the activitystarer1.resolveactivity method. Or should I accept that this is an inherent limitation of App Inventor 2? Submitted for your advice, please.

[Taifun]

@Edward_Kang

May I know if there is another way to code without using the activitystarer1.resolveactivity method.

the second example does not work anymore for some reason...
just use one of the Whatsapp extensions, for example the mentioned Sharing extension

Taifun

[Anke]

@Edward_Kang

activitystarer1.resolveactivity method. Or should I accept that this is an inherent limitation of App Inventor 2?

Problem with Activity Starter method resolve Activity

[Edward_Kang]

Thank you, Anke for the reply. I tried calling the activitystarter1.startactivity. It didn't work and it return an error on connectivity. I am not sure if this is a common problem or is it just me. haha.

[ewpatton]

If you are running Android 11, you're likely being affected by a security change in Android that prevents apps from querying for other apps on the phone with explicit mention in the app's manifest (the intent is to reduce apps' abilities to fingerprint and track users). This causes complications in particular for the companion since we can't really know at publication time what apps people will want to query for (e.g., you could write an app in App Inventor that queries for another App Inventor app, known only to you). I expect we can at least partially address the issue in compiled apps by extracting this information from the designer properties for the ActivityStarter to populate the manifest.

[Edward_Kang]

I got the error 601: No corresponding activity was found if I uses the call start activity command.

[Edward_Kang]

Thank you for sharing. I half suspect that this is the source of the problem.

[Gianluca_Sartori]

I have the same problem: error 601: No corresponding activity was found
Can anyone help me ?

[Taifun]

@Gianluca_Sartori

Can anyone help me

use another solution, i.e. not the activity starter
see again Whatsapp is not installed, Activity Starter Resolve Activity method returns empty string - #9 by Taifun
Taifun

[Edward_Kang]

Thank you, Taifun. I have managed to resolve the problem with your extension.

[Gianluca_Sartori]

Thank you.
But how can I select a contact from the address book with your extension ?

[Taifun]

@Gianluca_Sartori

how can I select a contact from the address book with your extension

sorry, my extension does not offer that feature...
there might be another extension, which probably offers that...
just try another Whatsapp extension from the extensions directory...

App Inventor Extensions | Pura Vida Apps

Taifun