733 lines
26 KiB
HTML
733 lines
26 KiB
HTML
|
<!DOCTYPE html>
|
||
|
<html>
|
||
|
<head>
|
||
|
<meta charset="utf-8">
|
||
|
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
|
||
|
<meta name="viewport" content="width=1024, user-scalable=no">
|
||
|
|
||
|
<title>Your deck.js Presentation</title>
|
||
|
|
||
|
<!-- Required stylesheet -->
|
||
|
<link rel="stylesheet" media="screen" href="core/deck.core.css">
|
||
|
|
||
|
<!-- Extension CSS files go here. Remove or add as needed. -->
|
||
|
<link rel="stylesheet" media="screen" href="extensions/goto/deck.goto.css">
|
||
|
<link rel="stylesheet" media="screen" href="extensions/menu/deck.menu.css">
|
||
|
<link rel="stylesheet" media="screen" href="extensions/navigation/deck.navigation.css">
|
||
|
<link rel="stylesheet" media="screen" href="extensions/status/deck.status.css">
|
||
|
<!-- <link rel="stylesheet" media="screen" href="extensions/scale/deck.scale.css"> -->
|
||
|
|
||
|
<!-- Style theme. More available in /themes/style/ or create your own. -->
|
||
|
<link rel="stylesheet" media="screen" href="themes/style/swiss.css">
|
||
|
|
||
|
<!-- Transition theme. More available in /themes/transition/ or create your own. -->
|
||
|
<link rel="stylesheet" media="screen" href="themes/transition/horizontal-slide.css">
|
||
|
|
||
|
<!-- Basic black and white print styles -->
|
||
|
<link rel="stylesheet" media="print" href="core/print.css">
|
||
|
|
||
|
<!-- Required Modernizr file -->
|
||
|
<script src="modernizr.custom.js"></script>
|
||
|
</head>
|
||
|
<body style="margin:0px;padding:0px;overflow:hidden">
|
||
|
<div class="deck-container">
|
||
|
|
||
|
<!-- Begin slides. Just make elements with a class of slide. -->
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>Android for Gio programmers</h2> <br></br>
|
||
|
<h3>Native Development Kit (NDK): direct access from cgo</h3>
|
||
|
<ul><li>limited Android API access</li></ul>
|
||
|
<h3>Java Native Interface: call Java code via cgo</h3>
|
||
|
<ul><li>custom Java classes</li></ul>
|
||
|
<h3>Java fragments: extend the main Gio Activity</h3>
|
||
|
<ul><li>permissions and application lifecycle</li></ul>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>NDK — sensor.h</h2>
|
||
|
<p>$ANDROID_HOME/ndk-bundle/sysroot/usr/include/android/sensor.h</p>
|
||
|
<pre style="font-size: 90%"><code># android/sensor.h
|
||
|
#if __ANDROID_API__ >= 26
|
||
|
/**
|
||
|
* Get a reference to the sensor manager. ASensorManager is a singleton
|
||
|
* per package as different packages may have access to different sensors.
|
||
|
*
|
||
|
* Example:
|
||
|
*
|
||
|
* ASensorManager* sensorManager = ASensorManager_getInstanceForPackage("foo.bar .baz");
|
||
|
*
|
||
|
*/
|
||
|
ASensorManager* ASensorManager_getInstanceForPackage(const char* packageName) __INTRODUCED_IN(26);
|
||
|
#endif
|
||
|
|
||
|
/**
|
||
|
* Returns the default sensor for the given type, or NULL if no sensor
|
||
|
* of that type exists.
|
||
|
*/
|
||
|
ASensor const* ASensorManager_getDefaultSensor(ASensorManager* manager, int type);
|
||
|
|
||
|
/**
|
||
|
* {@link ASensorManager} is an opaque type to manage sensors and
|
||
|
* events queues.
|
||
|
*
|
||
|
* {@link ASensorManager} is a singleton that can be obtained using
|
||
|
* ASensorManager_getInstance().
|
||
|
*
|
||
|
* This file provides a set of functions that uses {@link
|
||
|
* ASensorManager} to access and list hardware sensors, and
|
||
|
* create and destroy event queues:
|
||
|
* - ASensorManager_getSensorList()
|
||
|
* - ASensorManager_getDefaultSensor()
|
||
|
* - ASensorManager_getDefaultSensorEx()
|
||
|
* - ASensorManager_createEventQueue()
|
||
|
* - ASensorManager_destroyEventQueue()
|
||
|
*/
|
||
|
typedef struct ASensorManager ASensorManager;
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>NDK — nswrap</h2>
|
||
|
<img src="nswrap-git.png"></img>
|
||
|
</section>
|
||
|
|
||
|
<!--
|
||
|
<section class="slide">
|
||
|
<h2>NDK android27.yaml</h2>
|
||
|
<p>nswrap configuration: android27.yaml</p>
|
||
|
<pre style="font-size: 65%"><code>package: android27
|
||
|
libraries: [android, log, nativewindow, m]
|
||
|
inputfiles:
|
||
|
- $ANDROID_HOME/ndk-bundle/sysroot/usr/include/android/native_window.h
|
||
|
- $ANDROID_HOME/ndk-bundle/sysroot/usr/include/android/log.h
|
||
|
- $ANDROID_HOME/ndk-bundle/sysroot/usr/include/android/sensor.h
|
||
|
- $ANDROID_HOME/ndk-bundle/sysroot/usr/include/jni.h
|
||
|
- $ANDROID_HOME/ndk-bundle/sysroot/usr/include/sys/stat.h
|
||
|
sysimports:
|
||
|
- android/native_window.h
|
||
|
- android/log.h
|
||
|
- android/sensor.h
|
||
|
- jni.h
|
||
|
- stdlib.h
|
||
|
- sys/stat.h
|
||
|
functions:
|
||
|
- .*
|
||
|
functionignore:
|
||
|
- JNI_CreateJavaVM
|
||
|
- JNI_GetCreatedJavaVMs
|
||
|
- JNI_GetDefaultJavaVMInitArgs
|
||
|
- JNI_OnLoad
|
||
|
- JNI_OnUnload
|
||
|
- AHardwareBuffer_lockPlanes
|
||
|
- wcstoimax
|
||
|
- wcstoumax
|
||
|
- imaxdiv
|
||
|
# - __system_property_get
|
||
|
enums:
|
||
|
- .*
|
||
|
typesubs:
|
||
|
Stat: Stat_t
|
||
|
Stat64: Stat64_t
|
||
|
clang: $ANDROID_HOME/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android27-clang
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class = "slide">
|
||
|
<h2>NDK — Clang AST</h2>
|
||
|
<p>nswrap reads the Clang ast</p>
|
||
|
<pre><code>...
|
||
|
|-TypedefDecl 0x7fac6e838220 <line:480:1, col:31> col:31 referenced ASensorManager 'struct ASensorManager':'struct ASensorManager'
|
||
|
| |-ElaboratedType 0x7fac6e8371d0 'struct ASensorManager' sugar
|
||
|
| | `-RecordType 0x7fac6e837180 'struct ASensorManager'
|
||
|
| | `-Record 0x7fac6e837100 'ASensorManager'
|
||
|
| `-FullComment 0x7fac6e8468a0 <line:465:3, col:10>
|
||
|
| |-ParagraphComment 0x7fac6e8465a0 <col:3, col:4>
|
||
|
| | `-TextComment 0x7fac6e846570 <col:3, col:4> Text=" {"
|
||
|
| `-VerbatimBlockComment 0x7fac6e8465c0 <col:5, col:10> Name="link" CloseName=""
|
||
|
| |-VerbatimBlockLineComment 0x7fac6e846610 <col:10, col:66> Text=" ASensorManager} is an opaque type to manage sensors and"
|
||
|
| |-VerbatimBlockLineComment 0x7fac6e846630 <line:466:3, col:18> Text=" events queues."
|
||
|
...
|
||
|
|-FunctionDecl 0x7fac6e838b28 <line:568:1, versioning.h:19:89> sensor.h:568:17 ASensorManager_getInstanceForPackage 'ASensorManager *(const char *)'
|
||
|
| |-ParmVarDecl 0x7fac6e838a00 <col:54, col:66> col:66 packageName 'const char *'
|
||
|
| |-AnnotateAttr 0x7fac6e838bc8 <versioning.h:19:51, col:87> "introduced_in=26"
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>NDK — nswrap output</h2>
|
||
|
<p>nswrap generates 1270 lines of Go code</p>
|
||
|
<p>android27/main.go</p>
|
||
|
<pre style="font-size:75%"><code>package android27
|
||
|
...
|
||
|
type ASensorManager = C.struct_ASensorManager
|
||
|
|
||
|
const ASENSOR_TYPE_INVALID = C.ASENSOR_TYPE_INVALID
|
||
|
const ASENSOR_TYPE_ACCELEROMETER = C.ASENSOR_TYPE_ACCELEROMETER
|
||
|
const ASENSOR_TYPE_MAGNETIC_FIELD = C.ASENSOR_TYPE_MAGNETIC_FIELD
|
||
|
const ASENSOR_TYPE_GYROSCOPE = C.ASENSOR_TYPE_GYROSCOPE
|
||
|
...
|
||
|
|
||
|
func ASensorManagerGetInstanceForPackage(packageName *Char) *ASensorManager {
|
||
|
ret := (*ASensorManager)(unsafe.Pointer(C.ASensorManager_getInstanceForPackage((*C.char)(packageName))))
|
||
|
return ret
|
||
|
}
|
||
|
|
||
|
func ASensorManagerGetDefaultSensor(manager *ASensorManager, type_ Int) *ASensor {
|
||
|
ret := (*ASensor)(unsafe.Pointer(C.ASensorManager_getDefaultSensor((*C.ASensorManager)(manager), (C.int)(type_))))
|
||
|
return ret
|
||
|
}
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
-->
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>NDK — Android-specific Go code</h2>
|
||
|
<p>os_android.go</p>
|
||
|
<pre style="font-size: 65%"><code>import ndk "git.wow.st/gmp/android-go/android27"
|
||
|
|
||
|
func sensorLoop() {
|
||
|
// the Android Looper is thread-local
|
||
|
runtime.LockOSThread()
|
||
|
|
||
|
pkg := ndk.CharWithGoString("st.wow.git.sensors")
|
||
|
manager := ndk.ASensorManagerGetInstanceForPackage(pkg)
|
||
|
pkg.Free()
|
||
|
|
||
|
sens := ndk.ASensorManagerGetDefaultSensor(manager, ndk.ASENSOR_TYPE_ACCELEROMETER)
|
||
|
stp := ndk.ASensorGetStringType(sens)
|
||
|
labchan <- "sensor" + stp.String()
|
||
|
|
||
|
var looper *ndk.ALooper
|
||
|
var queue *ndk.ASensorEventQueue
|
||
|
looper_id := 1
|
||
|
var rate ndk.Int32_t = 60
|
||
|
|
||
|
setup := func() {
|
||
|
looper = ndk.ALooperForThread()
|
||
|
if (looper == nil) {
|
||
|
labchan <- "no looper for thread"
|
||
|
looper = ndk.ALooperPrepare(ndk.ALOOPER_PREPARE_ALLOW_NON_CALLBACKS)
|
||
|
}
|
||
|
|
||
|
queue = ndk.ASensorManagerCreateEventQueue(manager, looper, looper_id)
|
||
|
|
||
|
ndk.ASensorEventQueueEnableSensor(queue, sens)
|
||
|
ndk.ASensorEventQueueSetEventRate(queue, sens, 1000000/rate) // microseconds
|
||
|
}
|
||
|
|
||
|
setup()
|
||
|
...
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>NDK — Android main polling loop</h2>
|
||
|
<p>os_android.go (86 total lines)</p>
|
||
|
<pre style="font-size:75%"><code>func sensorLoop() {
|
||
|
...
|
||
|
|
||
|
for {
|
||
|
var zero ndk.Int
|
||
|
id := (int)(ndk.ALooperPollOnce(-1, &zero, &zero, (*unsafe.Pointer)(unsafe.Pointer(nil)))) // poll forever
|
||
|
if (id == ndk.ALOOPER_POLL_ERROR) { // set up a new looper
|
||
|
labchan <- "getting a new looper"
|
||
|
setup()
|
||
|
continue
|
||
|
}
|
||
|
if (id == looper_id) {
|
||
|
var event ndk.ASensorEvent
|
||
|
if (ndk.ASensorEventQueueGetEvents(queue, &event, 1) != 1) {
|
||
|
continue
|
||
|
}
|
||
|
accel := (&event).Acceleration()
|
||
|
senschan <- vector{float64(accel.X()), float64(accel.Y()), float64(accel.Z())}
|
||
|
}
|
||
|
}
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>NDK — Gio app setup</h2>
|
||
|
<p>main.go</p>
|
||
|
<pre style="font-size: 70%"><code>func eventloop() {
|
||
|
w := app.NewWindow( app.Size(unit.Dp(400), unit.Dp(400)), app.Title("Hello"))
|
||
|
th := material.NewTheme(gofont.Collection())
|
||
|
var ops op.Ops
|
||
|
|
||
|
var accel vector
|
||
|
|
||
|
var cx, cy, cvx, cvy, cs float32 // circle position, velocity and radius
|
||
|
cx = 200
|
||
|
cy = 200
|
||
|
cs = 50 // circle size (radius)
|
||
|
|
||
|
circle := func(gtx C, width, height float32) D {
|
||
|
// clip circle position and bounce off of the edges
|
||
|
if (cx < cs) { cx = cs; cvx = (-0.5) * cvx }
|
||
|
if (cy < cs) { cy = cs; cvy = (-0.5) * cvy }
|
||
|
if (cx > width - cs) { cx = width - cs; cvx = (-0.5) * cvx }
|
||
|
if (cy > height - cs) { cy = height - cs; cvy = (-0.5) * cvy }
|
||
|
|
||
|
blue := color.RGBA{0x3f, 0x51, 0xb5, 0x80}
|
||
|
r1 := f32.Rectangle{f32.Point{cx - cs, cy - cs}, f32.Point{cx + cs, cy + cs}}
|
||
|
clip.Rect{ Rect: r1, NE: cs, NW: cs, SE: cs, SW: cs}.Op(gtx.Ops).Add(gtx.Ops)
|
||
|
paint.ColorOp{Color: blue}.Add(gtx.Ops)
|
||
|
paint.PaintOp{Rect: r1}.Add(gtx.Ops)
|
||
|
|
||
|
var ret D
|
||
|
ret.Size.X = int(cs * 2)
|
||
|
ret.Size.Y = int(cs * 2)
|
||
|
return ret
|
||
|
}
|
||
|
...
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>NDK — Gio app main loop</h2>
|
||
|
<p>main.go (174 total lines)</p>
|
||
|
<pre style="font-size:65%"><code> ...
|
||
|
ticker := time.NewTicker(time.Second / 60)
|
||
|
|
||
|
var t, told int64
|
||
|
t = time.Now().UnixNano()
|
||
|
|
||
|
for {
|
||
|
select {
|
||
|
case <- ticker.C:
|
||
|
told = t
|
||
|
t = time.Now().UnixNano()
|
||
|
elapsed := float32((t - told) / 1000000)
|
||
|
|
||
|
cvx = cvx - float32(accel.x/1000) * elapsed
|
||
|
cvy = cvy + float32(accel.y/1000) * elapsed
|
||
|
|
||
|
cx = cx + cvx * elapsed
|
||
|
cy = cy + cvy * elapsed
|
||
|
w.Invalidate()
|
||
|
|
||
|
case x := <-senschan:
|
||
|
accel = x
|
||
|
|
||
|
case e := <-w.Events():
|
||
|
switch e := e.(type) {
|
||
|
case system.FrameEvent:
|
||
|
gtx := layout.NewContext(&ops, e)
|
||
|
... // draw everything
|
||
|
e.Frame(gtx.Ops)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>NDK — Building an APK</h2>
|
||
|
<pre><code>$ gogio -target android -minsdk 27 .
|
||
|
$ adb install sensors.apk
|
||
|
</code></pre>
|
||
|
<img src="accel.jpg" style="width:60%"></img>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>JNI — Java Native Interface</h2>
|
||
|
<p>Use JNI from cgo to:</p>
|
||
|
<ul>
|
||
|
<li>Access Android Java APIs (with limitations)</li>
|
||
|
<li>Call methods on your own Java classes</li>
|
||
|
</ul>
|
||
|
<p>To use it:
|
||
|
<ul>
|
||
|
<li>create (or acquire) a Java Virtual Machine (JavaVM)</li>
|
||
|
<li>use the JavaVM to obtain a JNI Native Interface struct (JNIEnv)</li>
|
||
|
<li>call function pointers inside the JNIEnv struct</li>
|
||
|
</ul>
|
||
|
<p>$ANDROID_HOME/ndk-bundle/sysroot/usr/include/jni.h</p>
|
||
|
<pre style="font-size:65%"><code>typedef const struct JNINativeInterface* JNIEnv;
|
||
|
typedef const struct JNIInvokeInterface* JavaVM;
|
||
|
|
||
|
/*
|
||
|
* Table of interface function pointers.
|
||
|
*/
|
||
|
struct JNINativeInterface {
|
||
|
jobject (*NewObject)(JNIEnv*, jclass, jmethodID, ...);
|
||
|
jclass (*GetObjectClass)(JNIEnv*, jobject);
|
||
|
jboolean (*IsInstanceOf)(JNIEnv*, jobject, jclass);
|
||
|
jmethodID (*GetMethodID)(JNIEnv*, jclass, const char*, const char*);
|
||
|
|
||
|
jobject (*CallObjectMethod)(JNIEnv*, jobject, jmethodID, ...);
|
||
|
jboolean (*CallBooleanMethod)(JNIEnv*, jobject, jmethodID, ...);
|
||
|
jbyte (*CallByteMethod)(JNIEnv*, jobject, jmethodID, ...);
|
||
|
jchar (*CallCharMethod)(JNIEnv*, jobject, jmethodID, ...);
|
||
|
jshort (*CallShortMethod)(JNIEnv*, jobject, jmethodID, ...);
|
||
|
jint (*CallIntMethod)(JNIEnv*, jobject, jmethodID, ...);
|
||
|
jlong (*CallLongMethod)(JNIEnv*, jobject, jmethodID, ...);
|
||
|
jfloat (*CallFloatMethod)(JNIEnv*, jobject, jmethodID, ...);
|
||
|
jdouble (*CallDoubleMethod)(JNIEnv*, jobject, jmethodID, ...);
|
||
|
void (*CallVoidMethod)(JNIEnv*, jobject, jmethodID, ...);
|
||
|
|
||
|
jobject (*GetObjectField)(JNIEnv*, jobject, jfieldID);
|
||
|
jboolean (*GetBooleanField)(JNIEnv*, jobject, jfieldID);
|
||
|
jbyte (*GetByteField)(JNIEnv*, jobject, jfieldID);
|
||
|
jchar (*GetCharField)(JNIEnv*, jobject, jfieldID);
|
||
|
jshort (*GetShortField)(JNIEnv*, jobject, jfieldID);
|
||
|
jint (*GetIntField)(JNIEnv*, jobject, jfieldID);
|
||
|
jlong (*GetLongField)(JNIEnv*, jobject, jfieldID);
|
||
|
jfloat (*GetFloatField)(JNIEnv*, jobject, jfieldID);
|
||
|
jdouble (*GetDoubleField)(JNIEnv*, jobject, jfieldID);
|
||
|
...
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>JNI — git.wow.st/gmp/jni</h2>
|
||
|
<iframe frameborder="0" src="jni/jni.html" style="transform:scale(1.5); transform-origin: 50% 0%;" width=800 height=13300></iframe>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>JNI — Basics</h2>
|
||
|
<p>my/java/AClass.java:</p>
|
||
|
<pre style="font-size:60%"><code>package my.java;
|
||
|
|
||
|
public class AClass {
|
||
|
public int Num() {
|
||
|
return 17;
|
||
|
}
|
||
|
}
|
||
|
</code></pre>
|
||
|
|
||
|
<p>main.go:</p>
|
||
|
<pre style="font-size:60%"><code>package main
|
||
|
//go:generate javac my/java/AClass.java
|
||
|
|
||
|
import (
|
||
|
"fmt"
|
||
|
"git.wow.st/gmp/jni"
|
||
|
)
|
||
|
|
||
|
func main() {
|
||
|
vm := jni.CreateJavaVM()
|
||
|
err := jni.Do(vm, func(env jni.Env) error {
|
||
|
cls := jni.FindClass(env, "my/java/AClass")
|
||
|
if cls == 0 {
|
||
|
return fmt.Errorf("Class not found")
|
||
|
}
|
||
|
mid := jni.GetMethodID(env, cls, "<init>", "()V")
|
||
|
if mid == nil {
|
||
|
return fmt.Errorf("Initializer not found")
|
||
|
}
|
||
|
inst, err := jni.NewObject(env, cls, mid)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
mid = jni.GetMethodID(env, cls, "Num", "()I")
|
||
|
if mid == nil {
|
||
|
return fmt.Errorf("Method not found")
|
||
|
}
|
||
|
res, err := jni.CallIntMethod(env, inst, mid)
|
||
|
if err != nil {
|
||
|
return err
|
||
|
}
|
||
|
fmt.Printf("Result: %d\n", res)
|
||
|
return nil
|
||
|
})
|
||
|
if err != nil {
|
||
|
fmt.Printf(err.Error())
|
||
|
}
|
||
|
}
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>JNI — Using JNI on Android</h2>
|
||
|
<p><code>gogio</code> looks for <code>.jar</code> files in your package
|
||
|
directory and across all imports. Every class from these <code>.jar</code> files
|
||
|
will be bundled with your <code>apk</code></p>
|
||
|
<pre style="font-size:65%"><code>$ apktool d hrm.apk
|
||
|
$ find hrm/smali -type f
|
||
|
hrm/smali/org/gioui/GioView$1.smali
|
||
|
hrm/smali/org/gioui/GioView.smali
|
||
|
hrm/smali/org/gioui/GioView$3.smali
|
||
|
hrm/smali/org/gioui/GioView$4.smali
|
||
|
hrm/smali/org/gioui/GioView$2.smali
|
||
|
hrm/smali/org/gioui/Gio.smali
|
||
|
hrm/smali/org/gioui/GioActivity.smali
|
||
|
hrm/smali/org/gioui/Gio$1.smali
|
||
|
hrm/smali/org/gioui/GioView$InputConnection.smali
|
||
|
hrm/smali/st/wow/git/ble/BlessedConnect$3.smali
|
||
|
hrm/smali/st/wow/git/ble/BlessedConnect$1.smali
|
||
|
hrm/smali/st/wow/git/ble/BlessedConnect$2.smali
|
||
|
hrm/smali/st/wow/git/ble/BlessedConnect.smali
|
||
|
hrm/smali/timber/log/Timber.smali
|
||
|
hrm/smali/timber/log/Timber$Tree.smali
|
||
|
hrm/smali/timber/log/Timber$DebugTree.smali
|
||
|
hrm/smali/timber/log/Timber$1.smali
|
||
|
hrm/smali/com/welie/blessed/BluetoothPeripheral$1$9.smali
|
||
|
hrm/smali/com/welie/blessed/BluetoothPeripheral$11.smali
|
||
|
hrm/smali/com/welie/blessed/BluetoothCentral$4.smali
|
||
|
...
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>JNI — JNI Limitations on Android</h2>
|
||
|
<p>Key limitation: cannot override <code>Activity</code> methods:</p>
|
||
|
<ul>
|
||
|
<li><code>onActivityResult</code></li>
|
||
|
<li><code>onRequestPermissionResult</code></li>
|
||
|
<li>Lifecycle methods: <code>onCreate</code>, <code>onDestroy</code>, etc.</li>
|
||
|
</ul>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>Java Fragments</h2>
|
||
|
<p>There are lots of gaps in the NDK and limitations with JNI.
|
||
|
Fragments can access the rest.</p>
|
||
|
<img src="fragment.png"></img>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>Java Fragments — Basics</h2>
|
||
|
<p>os_android.go</p>
|
||
|
<pre style="font-size:61%"><code>import (
|
||
|
"gioui.org/app"
|
||
|
"git.wow.st/gmp/jni"
|
||
|
)
|
||
|
|
||
|
func registerFragment(w *app.Window) {
|
||
|
vm := jni.JVMFor(app.JavaVM())
|
||
|
|
||
|
w.Do(func(view uintptr) {
|
||
|
err := jni.Do(vm, func(env jni.Env) error {
|
||
|
cls := jni.FindClass(env, "st/wow/git/fragment/AFrag")
|
||
|
mth := jni.GetMethodID(env, cls, "<init>", "()V");
|
||
|
inst, err := jni.NewObject(env, cls, mth)
|
||
|
mth = jni.GetMethodID(env, cls, "register", "(Landroid/view/View;)V");
|
||
|
jni.CallVoidMethod(env, inst, mth, jni.Value(view))
|
||
|
return nil
|
||
|
})
|
||
|
if err != nil { ... }
|
||
|
})
|
||
|
}
|
||
|
</code></pre>
|
||
|
<p>AFrag.java</p>
|
||
|
<pre style="font-size:61%"><code>package com.afrag.AFrag;
|
||
|
|
||
|
import android.app.Activity;
|
||
|
import android.app.Fragment;
|
||
|
import android.app.FragmentTransaction;
|
||
|
import android.content.Context;
|
||
|
import android.util.Log;
|
||
|
import android.view.View;
|
||
|
|
||
|
public class AFrag extends Fragment {
|
||
|
public void register(View view) {
|
||
|
Activity act = (Activity)view.getContext();
|
||
|
FragmentTransaction ft = act.getFragmentManager().beginTransaction();
|
||
|
ft.add(this, "AFrag");
|
||
|
ft.commitNow();
|
||
|
}
|
||
|
|
||
|
@Override public void onAttach(Context ctx) {
|
||
|
super.onAttach(ctx);
|
||
|
}
|
||
|
}
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>Java Fragments — Permissions (Java)</h2>
|
||
|
<p>Here we are going to connect to Bluetooth low-energy peripherals using a
|
||
|
library called Blessed (<a href="https://github.com/weliem/blessed-android">https://github.com/weliem/blessed-android</a>)</p>
|
||
|
<p>We need permission to access Bluetooth hardware, which, on Android,
|
||
|
requies <code>ACCESS_FINE_LOCATION</code>, which is a "dangerous" permission. See:
|
||
|
<a href="https://developer.android.com/reference/android/Manifest.permission#ACCESS_FINE_LOCATION">developer.android.com/reference/android/Manifest.permission</a></p>
|
||
|
<p>We need to request access to this permission at runtime.</p>
|
||
|
<p>BlessedConnect.java:</p>
|
||
|
<pre style="font-size:57%"><code>package st.wow.git.ble;
|
||
|
|
||
|
import android.app.Fragment;
|
||
|
|
||
|
import com.welie.blessed.BluetoothCentral;
|
||
|
import com.welie.blessed.BluetoothCentralCallback;
|
||
|
import com.welie.blessed.BluetoothPeripheral;
|
||
|
import com.welie.blessed.BluetoothPeripheralCallback;
|
||
|
|
||
|
public class BlessedConnect extends Fragment {
|
||
|
final int PERMISSION_REQUEST = 1;
|
||
|
final int REQUEST_ENABLE_BT = 2;
|
||
|
|
||
|
@Override public void onAttach(Context ctx) {
|
||
|
super.onAttach(ctx);
|
||
|
if (ctx.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
|
||
|
requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSION_REQUEST);
|
||
|
}
|
||
|
System.loadLibrary("gio");
|
||
|
installComplete(this);
|
||
|
}
|
||
|
|
||
|
public void onRequestPermissionsResult (int requestCode, String[] permissions, int[] grantResults) {
|
||
|
if (requestCode == PERMISSION_REQUEST) {
|
||
|
boolean granted = true;
|
||
|
for (int x : grantResults) {
|
||
|
if (x == PackageManager.PERMISSION_DENIED) {
|
||
|
granted = false;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static private native void installComplete(BlessedConnect p);
|
||
|
}
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>Java Fragments — Permissions (Go)</h2>
|
||
|
<p>We need to ask <code>gogio</code> to add all required permissions to
|
||
|
AndroidManifest.xml</p>
|
||
|
<p>os_android.go:</p>
|
||
|
<pre style="font-size:70%"><code>import (
|
||
|
"gioui.org/app"
|
||
|
_ "gioui.org/app/permission/bluetooth"
|
||
|
)
|
||
|
</code></pre>
|
||
|
<p>AndroidManifest.xml:</p>
|
||
|
<pre style="font-size:70%"><code>
|
||
|
<?xml version="1.0" encoding="utf-8" standalone="no"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" android:compileSdkVersion="29" android:compileSdkVersionCodename="10" package="git.wow.st.hrm" platformBuildVersionCode="29" platformBuildVersionName="10">
|
||
|
<uses-permission android:name="android.permission.BLUETOOTH"/>
|
||
|
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
|
||
|
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
|
||
|
<uses-feature android:glEsVersion="0x00030000" android:required="false"/>
|
||
|
<uses-feature android:name="android.hardware.bluetooth" android:required="false"/>
|
||
|
<uses-feature android:name="android.hardware.bluetooth_le" android:required="false"/>
|
||
|
<application android:icon="@mipmap/ic_launcher" android:label="Hrm">
|
||
|
<activity android:configChanges="keyboardHidden|orientation" android:label="Hrm" android:name="org.gioui.GioActivity" android:theme="@style/Theme.GioApp" android:windowSoftInputMode="adjustResize">
|
||
|
<intent-filter>
|
||
|
<action android:name="android.intent.action.MAIN"/>
|
||
|
<category android:name="android.intent.category.LAUNCHER"/>
|
||
|
</intent-filter>
|
||
|
</activity>
|
||
|
</application>
|
||
|
</manifest>
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class ="slide">
|
||
|
<h2>Java Fragments — Gio app</h2>
|
||
|
<p>main.go is 482 lines. No platform-specific code is required in the Gio app.</p>
|
||
|
<pre style="font-size:65%"><code>import (
|
||
|
"gioui.org/app"
|
||
|
"git.wow.st/gmp/ble"
|
||
|
)
|
||
|
|
||
|
func eventloop()
|
||
|
w := app.NewWindow()
|
||
|
...
|
||
|
b := ble.NewBLE()
|
||
|
b.Enable(w)
|
||
|
|
||
|
select {
|
||
|
case e := <-b.Events():
|
||
|
switch e := e.(type) {
|
||
|
case ble.UpdateStateEvent: ...
|
||
|
case ble.DiscoverPeripheralEvent: ...
|
||
|
case ble.ConnectEvent: ...
|
||
|
case ble.ConnectTimeoutEvent: ...
|
||
|
case ble.DiscoverServiceEvent: ...
|
||
|
case ble.DiscoverCharacteristicEvent: ...
|
||
|
case ble.UpdateValueEvent: ...
|
||
|
}
|
||
|
w.Invalidate()
|
||
|
case e := <-w.Events():
|
||
|
switch e := e.(type) {
|
||
|
case system.DestroyEvent:
|
||
|
return
|
||
|
case system.FrameEvent:
|
||
|
gtx := layout.NewContext(&ops, e)
|
||
|
... // draw everything
|
||
|
e.Frame(gtx.Ops)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
</code></pre>
|
||
|
</section>
|
||
|
|
||
|
<section class="slide">
|
||
|
<h2>Java Fragments — BLE API</h2>
|
||
|
<pre><code>func (b *BLE) Enable(w *app.Window)
|
||
|
func (b *BLE) State() string
|
||
|
func (b *BLE) Events() chan interface{}
|
||
|
func (b *BLE) Scan()
|
||
|
func (b *BLE) StopScan()
|
||
|
func (p Peripheral) DiscoverServices()
|
||
|
func (p Peripheral) DiscoverCharacteristics(serv Service)
|
||
|
func (p Peripheral) SetNotifyValue(c Characteristic)
|
||
|
func (b *BLE) Connect(p Peripheral) bool
|
||
|
func CancelConnection(p Peripheral)
|
||
|
func Disconnect(p Peripheral)
|
||
|
</code></pre>
|
||
|
<img src="ble.png" style="width:70%"></img>
|
||
|
</section>
|
||
|
|
||
|
<section class ="slide">
|
||
|
<h2>Links</h2>
|
||
|
<ol>
|
||
|
<p><a href="https://git.wow.st/gmp/nswrap">git.wow.st/gmp/nswrap</a></p>
|
||
|
<p><a href="https://git.wow.st/gmp/android-go">git.wow.st/gmp/android-go</a></p>
|
||
|
<p><a href="https://git.wow.st/gmp/hrm">git.wow.st/gmp/jni</a></p>
|
||
|
<p><a href="https://git.wow.st/gmp/ble">git.wow.st/gmp/ble</a></p>
|
||
|
<p><a href="https://git.wow.st/gmp/hrm">git.wow.st/gmp/hrm</a></p>
|
||
|
<p><a href="https://git.wow.st/gmp/passgo">git.wow.st/gmp/passgo</a></p>
|
||
|
</ol>
|
||
|
</section>
|
||
|
<!-- End slides. -->
|
||
|
|
||
|
<!-- Begin extension snippets. Add or remove as needed. -->
|
||
|
|
||
|
<!-- deck.navigation snippet -->
|
||
|
<div aria-role="navigation">
|
||
|
<a href="#" class="deck-prev-link" title="Previous">←</a>
|
||
|
<a href="#" class="deck-next-link" title="Next">→</a>
|
||
|
</div>
|
||
|
|
||
|
<!-- deck.status snippet -->
|
||
|
<p class="deck-status" aria-role="status">
|
||
|
<span class="deck-status-current"></span>
|
||
|
/
|
||
|
<span class="deck-status-total"></span>
|
||
|
</p>
|
||
|
|
||
|
<!-- deck.goto snippet -->
|
||
|
<form action="." method="get" class="goto-form">
|
||
|
<label for="goto-slide">Go to slide:</label>
|
||
|
<input type="text" name="slidenum" id="goto-slide" list="goto-datalist">
|
||
|
<datalist id="goto-datalist"></datalist>
|
||
|
<input type="submit" value="Go">
|
||
|
</form>
|
||
|
|
||
|
<!-- End extension snippets. -->
|
||
|
</div>
|
||
|
|
||
|
<!-- Required JS files. -->
|
||
|
<script src="jquery.min.js"></script>
|
||
|
<script src="core/deck.core.js"></script>
|
||
|
|
||
|
<!-- Extension JS files. Add or remove as needed. -->
|
||
|
<script src="extensions/menu/deck.menu.js"></script>
|
||
|
<script src="extensions/goto/deck.goto.js"></script>
|
||
|
<script src="extensions/status/deck.status.js"></script>
|
||
|
<script src="extensions/navigation/deck.navigation.js"></script>
|
||
|
<!-- <script src="extensions/scale/deck.scale.js"></script> -->
|
||
|
|
||
|
<!-- Initialize the deck. You can put this in an external file if desired. -->
|
||
|
<script>
|
||
|
$(function() {
|
||
|
$.deck('.slide');
|
||
|
});
|
||
|
</script>
|
||
|
</body>
|
||
|
</html>
|