Basic app boilerplate; display an empty window.

main.go

@@ -0,0 +1,31 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin linux
+
+package main
+
+import (
+	"golang.org/x/mobile/app"
+	"golang.org/x/mobile/event/lifecycle"
+	"golang.org/x/mobile/event/paint"
+)
+
+func main() {
+	app.Main(func(a app.App) {
+		for e := range a.Events() {
+			switch e := a.Filter(e).(type) {
+			case lifecycle.Event:
+				switch e.Crosses(lifecycle.StageVisible) {
+				case lifecycle.CrossOn:
+					// App visible.
+				case lifecycle.CrossOff:
+					// App no longer visible.
+				}
+			case paint.Event:
+				a.Publish()
+			}
+		}
+	})
+}