Merge pull request #74 from niuhuan/fix-url_launcher

fix: url_launcher

Author: pchampio

url_launcher/plugin.go

@@ -10,7 +10,12 @@ import (
 	"github.com/pkg/errors"
 )
 
-const channelName = "plugins.flutter.io/url_launcher"
+var channelNames = []string{
+	"plugins.flutter.io/url_launcher",
+	"plugins.flutter.io/url_launcher_macos",
+	"plugins.flutter.io/url_launcher_windows",
+	"plugins.flutter.io/url_launcher_linux",
+}
 
 // ImagePickerPlugin implements flutter.Plugin and handles method calls to
 // the plugins.flutter.io/url_launcher channel.
@@ -20,13 +25,15 @@ var _ flutter.Plugin = &UrlLauncherPlugin{} // compile-time type check
 
 // InitPlugin initializes the plugin.
 func (p *UrlLauncherPlugin) InitPlugin(messenger plugin.BinaryMessenger) error {
-	channel := plugin.NewMethodChannel(messenger, channelName, plugin.StandardMethodCodec{})
-	channel.HandleFunc("launch", p.launch)
-	channel.HandleFunc("canLaunch", p.canLaunch)
+	for _, channelName := range channelNames {
+		channel := plugin.NewMethodChannel(messenger, channelName, plugin.StandardMethodCodec{})
+		channel.HandleFunc("launch", p.launch)
+		channel.HandleFunc("canLaunch", p.canLaunch)
 
-	// Ignored: The plugins doesn't handle WebView.
-	// This call will not do anything, because there is no WebView to close.
-	channel.HandleFunc("closeWebView", func(_ interface{}) (interface{}, error) { return nil, nil })
+		// Ignored: The plugins doesn't handle WebView.
+		// This call will not do anything, because there is no WebView to close.
+		channel.HandleFunc("closeWebView", func(_ interface{}) (interface{}, error) { return nil, nil })
+	}
 	return nil
 }
 
@@ -38,8 +45,8 @@ func (p *UrlLauncherPlugin) launch(arguments interface{}) (reply interface{}, er
 		return nil, errors.New("url is empty")
 	}
 
-	useWebView := argsMap["useWebView"].(bool)
-	if useWebView == true {
+	useWebView, ok := argsMap["useWebView"].(bool)
+	if ok && useWebView == true {
 		fmt.Println("go-flutter-desktop/plugins/url_launcher: WebView aren't supported on desktop.")
 	}
 
@@ -54,7 +61,7 @@ func (p *UrlLauncherPlugin) launch(arguments interface{}) (reply interface{}, er
 		err = errors.New("Unsupported platform")
 	}
 
-	return nil, err
+	return err == nil, err
 }
 
 func (p *UrlLauncherPlugin) canLaunch(arguments interface{}) (reply interface{}, err error) {