Document why canLaunch can return false on Android API 30

Author: mvanbeusekom

packages/url_launcher/url_launcher/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 5.6.1
+
+* Add API documentation explaining the [canLaunch] method returns `false` if package visibility (Android API 30) is not managed correctly.
+
 ## 5.6.0
 
 * Support Windows by default.

packages/url_launcher/url_launcher/lib/url_launcher.dart

@@ -109,6 +109,11 @@ Future<bool> launch(
 
 /// Checks whether the specified URL can be handled by some app installed on the
 /// device.
+/// 
+/// On Android (from API 30), [canLaunch] will return `false` when the required
+/// visibility configuration is not provided in the AndroidManifest.xml file. 
+/// For more information see the [Managing package visibility](https://developer.android.com/training/basics/intents/package-visibility)
+/// article in the Android docs.
 Future<bool> canLaunch(String urlString) async {
   if (urlString == null) {
     return false;

packages/url_launcher/url_launcher/pubspec.yaml

@@ -2,7 +2,7 @@ name: url_launcher
 description: Flutter plugin for launching a URL on Android and iOS. Supports
   web, phone, SMS, and email schemes.
 homepage: https://github.com/flutter/plugins/tree/master/packages/url_launcher/url_launcher
-version: 5.6.0
+version: 5.6.1
 
 flutter:
   plugin: