0c8ff9f648
Change-Id: I82bac0dc24943c64560a0bac4687cbbbb8b5c328 Reviewed-on: https://go-review.googlesource.com/12841 Reviewed-by: Nigel Tao <nigeltao@golang.org>
100 lines
2.7 KiB
Go
100 lines
2.7 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin linux
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// An app that paints green if golang.org is reachable when the app first
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// starts, or red otherwise.
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//
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// In order to access the network from the Android app, its AndroidManifest.xml
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// file must include the permission to access the network.
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//
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// http://developer.android.com/guide/topics/manifest/manifest-intro.html#perms
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//
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// The gomobile tool auto-generates a default AndroidManifest file by default
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// unless the package directory contains the AndroidManifest.xml. Users can
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// customize app behavior, such as permissions and app name, by providing
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// the AndroidManifest file. This is irrelevent to iOS.
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//
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// Note: This demo is an early preview of Go 1.5. In order to build this
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// program as an Android APK using the gomobile tool.
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//
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// See http://godoc.org/golang.org/x/mobile/cmd/gomobile to install gomobile.
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//
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// Get the network example and use gomobile to build or install it on your device.
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//
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// $ go get -d golang.org/x/mobile/example/network
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// $ gomobile build golang.org/x/mobile/example/network # will build an APK
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//
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// # plug your Android device to your computer or start an Android emulator.
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// # if you have adb installed on your machine, use gomobile install to
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// # build and deploy the APK to an Android target.
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// $ gomobile install golang.org/x/mobile/example/network
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//
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// Switch to your device or emulator to start the network application from
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// the launcher.
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// You can also run the application on your desktop by running the command
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// below. (Note: It currently doesn't work on Windows.)
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// $ go install golang.org/x/mobile/example/network && network
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package main
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import (
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"net/http"
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"golang.org/x/mobile/app"
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"golang.org/x/mobile/event/config"
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"golang.org/x/mobile/event/paint"
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"golang.org/x/mobile/exp/app/debug"
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"golang.org/x/mobile/gl"
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)
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func main() {
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// checkNetwork runs only once when the app first loads.
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go checkNetwork()
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app.Main(func(a app.App) {
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var c config.Event
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for e := range a.Events() {
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switch e := app.Filter(e).(type) {
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case config.Event:
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c = e
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case paint.Event:
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onDraw(c)
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a.EndPaint(e)
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}
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}
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})
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}
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var (
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determined = make(chan struct{})
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ok = false
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)
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func checkNetwork() {
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defer close(determined)
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_, err := http.Get("http://golang.org/")
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if err != nil {
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return
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}
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ok = true
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}
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func onDraw(c config.Event) {
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select {
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case <-determined:
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if ok {
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gl.ClearColor(0, 1, 0, 1)
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} else {
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gl.ClearColor(1, 0, 0, 1)
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}
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default:
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gl.ClearColor(0, 0, 0, 1)
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}
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gl.Clear(gl.COLOR_BUFFER_BIT)
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debug.DrawFPS(c)
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}
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