How to open Whatsapp from other app

问题

I am developing an android app.
I want to open (just open) WhatsApp from my app.

How can I open WhatsApp from my app?

回答1:

Did you try this

Intent launchIntent = getPackageManager().getLaunchIntentForPackage("com.whatsapp");
        startActivity(launchIntent);

来源：https://stackoverflow.com/questions/29516628/how-to-open-whatsapp-from-other-app