what is code for this?
Do you want to open the third app in your app?
If so , you can try the following methods：
1． with a specific URL schema
You can try to call Device.OpenUri with a specific URL schema, example:
For more details:
2． With package (android)
Intent intent = new Intent(Intent.ActionMain);
Intent intent = PackageManager.GetLaunchIntentForPackage("com.package.address");
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