android-go/examples/sensors/android.go

//+build android

package main

import "C"

import (
	"fmt"
	"log"
	"os"

	"gioui.org/app"
	ndk "git.wow.st/gmp/android-go/android27"
)

var (
	tag *ndk.Char
)

func mkHomeDir() {
	msg := ndk.CharWithGoString("getting datadir")
	ndk.AndroidLogWrite(ndk.ANDROID_LOG_WARN, tag, msg)
	msg.Free()

	godir, _ := app.DataDir()
	labchan <- fmt.Sprintf("DataDir is %s", godir)

	msg = ndk.CharWithGoString("ok. calling mkdir")
	ndk.AndroidLogWrite(ndk.ANDROID_LOG_WARN, tag, msg)
	msg.Free()

	if _, err := os.Stat(godir); !os.IsNotExist(err) {
		labchan <- "already exists"
		return
	}
	if err := os.MkdirAll(godir, 0700); err != nil {
		fmt.Sprintf("Error creating directory: %s", err)
		labchan <- fmt.Sprintf("Error creating directory: %s", err)
	} else {
		labchan <- "created"
	}
}

func apiLevel() {
	msg := ndk.CharWithGoString("hello log world")
	ndk.AndroidLogWrite(ndk.ANDROID_LOG_WARN, tag, msg)
	msg.Free()
	apilevel := ndk.AndroidGetDeviceApiLevel()
	message := fmt.Sprintf("API level is %d", apilevel)
	labchan <- message
	msg = ndk.CharWithGoString(message)
	ndk.AndroidLogWrite(ndk.ANDROID_LOG_WARN, tag, msg)
	msg.Free()
}

func getSensors() {
	pkg := ndk.CharWithGoString("st.wow.git.jni")
	sm := ndk.ASensorManagerGetInstanceForPackage(pkg)
	pkg.Free()
	sens := ndk.ASensorManagerGetDefaultSensor(sm, ndk.ASENSOR_TYPE_ACCELEROMETER)
	stp := ndk.ASensorGetStringType(sens)
	labchan <- "sensor" + stp.String()
}

func init() {
	tag = ndk.CharWithGoString("gio")
	log.Print("Android starting")
	go apiLevel()
	go mkHomeDir()
	go getSensors()
}