Add JNI example.
This commit is contained in:
parent
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15
README.md
15
README.md
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@ -10,3 +10,18 @@ cd $GOPATH/src/git.wow.st/gmp/android-go/examples/sensors
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gogio -target android -minsdk 27 .
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adb install -r sensors.apk
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```
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There is also an example showing how to incorporate custom Java classes
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and access them (and the rest of the Android system) via JNI. To build it
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(on a Unix-like environment):
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```
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go get git.wow.st/gmp/android-go/examples/jni
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cd $GOPATH/src/git.wow.st/gmp/android-go/examples/jni
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go generate os_android.go
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gogio -target android -minsdk 27 .
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adb install -r jni.apk
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```
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To build on Windows, you will need to re-write the `go:generate` commands
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at the top of `os_android.go` as appropriate.
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9
examples/jni/AClass.java
Normal file
9
examples/jni/AClass.java
Normal file
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@ -0,0 +1,9 @@
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package st.wow.git.jni;
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public class AClass {
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public int Num() {
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return 17;
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}
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}
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130
examples/jni/jni_android.go
Normal file
130
examples/jni/jni_android.go
Normal file
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@ -0,0 +1,130 @@
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package main
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/*
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#cgo LDFLAGS: -landroid
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#include <stdlib.h>
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#include <jni.h>
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#include <android/log.h>
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static jobject gClassLoader;
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static jmethodID gFindClassMethod;
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void
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SetLoader(JNIEnv* env, jobject context) {
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jclass cclass = (*env)->GetObjectClass(env, context);
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jmethodID gcl_id = (*env)->GetMethodID(env, cclass, "getClassLoader", "()Ljava/lang/ClassLoader;");
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jobject loader = (*env)->CallObjectMethod(env, context, gcl_id);
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gClassLoader = (*env)->NewGlobalRef(env, loader);
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jclass lclass = (*env)->GetObjectClass(env, loader);
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gFindClassMethod = (*env)->GetMethodID(env, lclass, "findClass", "(Ljava/lang/String;)Ljava/lang/Class;");
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}
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jclass
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FindClass(JNIEnv* env, char* name) {
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jstring strClassName = (*env)->NewStringUTF(env, name);
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return (*env)->CallObjectMethod(env, gClassLoader, gFindClassMethod, strClassName);
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}
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JNIEXPORT jobject
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CreateObject(JNIEnv* env, jclass cls) {
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jmethodID init = (*env)->GetMethodID(env, cls, "<init>", "()V");
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return (*env)->NewObject(env, cls, init);
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}
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void CallVoidMethod(JNIEnv *env, jobject obj, jmethodID methodID) {
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(*env)->CallVoidMethod(env, obj, methodID);
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}
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jint CallIntMethod(JNIEnv *env, jobject obj, jmethodID methodID) {
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return (*env)->CallIntMethod(env, obj, methodID);
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}
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jmethodID GetMethodID(JNIEnv *env, jclass clazz, const char *name, const char *sig) {
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return (*env)->GetMethodID(env, clazz, name, sig);
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}
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jint GetEnv(JavaVM *vm, JNIEnv **env, jint version) {
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return (*vm)->GetEnv(vm, (void **)env, version);
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}
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jint AttachCurrentThread(JavaVM *vm, JNIEnv **p_env, void *thr_args) {
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return (*vm)->AttachCurrentThread(vm, p_env, thr_args);
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}
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jint DetachCurrentThread(JavaVM *vm) {
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return (*vm)->DetachCurrentThread(vm);
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}
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*/
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import "C"
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import (
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"errors"
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"fmt"
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"log"
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"runtime"
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"unsafe"
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)
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var theJVM *C.JavaVM
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type JNIEnv = C.JNIEnv
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func SetJVM(jvm, context uintptr) {
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log.Print("set theJVM")
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theJVM = (*C.JavaVM)(unsafe.Pointer(jvm))
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log.Printf("theJVM = %d", uintptr(unsafe.Pointer(theJVM)))
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RunInJVM(func(env *C.JNIEnv) {
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C.SetLoader(env, (C.jobject)(context))
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})
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}
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func FindClass(env *C.JNIEnv, name string) C.jclass {
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cname := C.CString(name)
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defer C.free(unsafe.Pointer(cname))
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return C.FindClass((*C.JNIEnv)(env), cname)
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}
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func JniCallVoidMethod(env *C.JNIEnv, obj C.jobject, methodID C.jmethodID) {
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C.CallVoidMethod(env, obj, methodID)
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}
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func JniCallIntMethod(env *C.JNIEnv, obj C.jobject, methodID C.jmethodID) int {
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return (int)(C.CallIntMethod(env, obj, methodID))
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}
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func JniGetMethodID(env *C.JNIEnv, cls C.jclass, name, sig string) C.jmethodID {
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cname := C.CString(name)
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defer C.free(unsafe.Pointer(cname))
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csig := C.CString(sig)
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defer C.free(unsafe.Pointer(csig))
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return C.GetMethodID(env, cls, cname, csig)
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}
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func CreateObject(env *C.JNIEnv, cls C.jclass) C.jobject {
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return C.CreateObject(env, (C.jclass)(cls))
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}
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func RunInJVM(f func(env *C.JNIEnv)) {
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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var env *C.JNIEnv
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var detach bool
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log.Printf("RunInJVM(): theJVM = %d", uintptr(unsafe.Pointer(theJVM)))
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if res := C.GetEnv(theJVM, &env, C.JNI_VERSION_1_6); res != C.JNI_OK {
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if res != C.JNI_EDETACHED {
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panic(fmt.Errorf("JNI GetEnv failed with error %d", res))
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}
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if C.AttachCurrentThread(theJVM, &env, nil) != C.JNI_OK {
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panic(errors.New("runInJVM: AttachCurrentThread failed"))
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}
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detach = true
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}
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if detach {
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defer func() {
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C.DetachCurrentThread(theJVM)
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}()
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}
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f(env)
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}
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80
examples/jni/main.go
Normal file
80
examples/jni/main.go
Normal file
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@ -0,0 +1,80 @@
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// +build darwin linux
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package main
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import (
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"log"
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"gioui.org/app"
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"gioui.org/io/system"
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"gioui.org/layout"
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"gioui.org/unit"
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"gioui.org/widget/material"
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_ "gioui.org/font/gofont"
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)
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var (
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labchan chan string
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)
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func main() {
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labchan = make(chan string)
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log.Print("Staring event loop")
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go eventloop()
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app.Main()
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log.Print("app.Main() returned")
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}
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func diffInsets(x, y system.Insets) bool {
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return x.Top != y.Top ||
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x.Bottom != y.Bottom ||
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x.Left != y.Left ||
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x.Right != y.Right
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}
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func eventloop() {
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w := app.NewWindow(
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app.Size(unit.Dp(400), unit.Dp(400)),
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app.Title("Hello"))
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th := material.NewTheme()
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gtx := &layout.Context{Queue: w.Queue()}
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sysinset := &layout.Inset{}
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margin := layout.UniformInset(unit.Dp(10))
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labels := []material.Label{}
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list := &layout.List{Axis: layout.Vertical}
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resetSysinset := func(x system.Insets) {
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sysinset.Top = x.Top
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sysinset.Bottom = x.Bottom
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sysinset.Left = x.Left
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sysinset.Right = x.Right
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}
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go func() {
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labchan <- "Starting"
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callJni()
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}()
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for {
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select {
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case x := <-labchan:
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labels = append(labels, th.Body1(x))
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case e := <-w.Events():
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switch e := e.(type) {
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case system.DestroyEvent:
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return
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case system.FrameEvent:
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gtx.Reset(e.Config, e.Size)
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resetSysinset(e.Insets)
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sysinset.Layout(gtx, func() {
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margin.Layout(gtx, func() {
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list.Layout(gtx, len(labels), func(i int) {
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labels[i].Layout(gtx)
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})
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})
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})
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e.Frame(gtx.Ops)
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}
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}
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}
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}
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39
examples/jni/os_android.go
Normal file
39
examples/jni/os_android.go
Normal file
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@ -0,0 +1,39 @@
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//go:generate javac -bootclasspath $ANDROID_HOME/platforms/android-29/android.jar AClass.java
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//go:generate jar cf AClass.jar AClass.class
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//go:generate rm AClass.class
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package main
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import (
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"fmt"
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"log"
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"time"
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"gioui.org/app"
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)
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func callJni() {
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time.Sleep(time.Second/5)
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h := app.PlatformHandle()
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labchan <- fmt.Sprintf("JVM = %d", h.JVM)
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labchan <- fmt.Sprintf("Context = %d", h.Context)
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SetJVM(h.JVM, h.Context)
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RunInJVM(func(env *JNIEnv) {
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log.Print("finding class")
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cls := FindClass(env, "st/wow/git/jni/AClass")
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log.Print("getting methodID")
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mth := JniGetMethodID(env, cls, "Num", "()I")
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if mth == nil {
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labchan <- "nil method"
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return
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}
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log.Print("creating object")
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inst := CreateObject(env, cls)
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log.Print("calling method")
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val := JniCallIntMethod(env, inst, mth)
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log.Print("got result")
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labchan <- fmt.Sprintf("val = %d", val)
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})
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}
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7
examples/jni/os_other.go
Normal file
7
examples/jni/os_other.go
Normal file
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@ -0,0 +1,7 @@
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// +build !android
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package main
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func callJni() {
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}
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@ -3,25 +3,18 @@
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package main
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import (
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"image/color"
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"log"
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"gioui.org/app"
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"gioui.org/io/system"
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"gioui.org/layout"
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"gioui.org/text"
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"gioui.org/text/shape"
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"gioui.org/unit"
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"gioui.org/widget/material"
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"golang.org/x/image/font/gofont/goregular"
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"golang.org/x/image/font/sfnt"
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_ "gioui.org/font/gofont"
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)
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var (
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face text.Face
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white = color.RGBA{A: 0xff, R: 0xff, G: 0xff, B: 0xff}
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gray = color.RGBA{A: 0xff, R: 0xb0, G: 0xb0, B: 0xb0}
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black = color.RGBA{A: 0xff, R: 0x00, G: 0x00, B: 0x00}
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labchan chan string
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)
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@ -33,7 +26,7 @@ func main() {
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log.Print("App closed")
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}
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func diffInsets(x, y app.Insets) bool {
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func diffInsets(x, y system.Insets) bool {
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return x.Top != y.Top ||
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x.Bottom != y.Bottom ||
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x.Left != y.Left ||
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@ -42,41 +35,36 @@ func diffInsets(x, y app.Insets) bool {
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func eventloop() {
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w := app.NewWindow(
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app.WithWidth(unit.Dp(400)),
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app.WithHeight(unit.Dp(400)),
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app.WithTitle("Hello"))
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app.Size(unit.Dp(400), unit.Dp(400)),
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app.Title("Hello"))
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th := material.NewTheme()
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gtx := &layout.Context{Queue: w.Queue()}
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var faces shape.Faces
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regular, err := sfnt.Parse(goregular.TTF)
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if err != nil {
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log.Fatal("Cannot parse font.")
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}
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face = faces.For(regular, unit.Sp(16))
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sysinset := &layout.Inset{}
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margin := layout.UniformInset(unit.Dp(10))
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labels := []*text.Label{}
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labels := []material.Label{}
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list := &layout.List{Axis: layout.Vertical}
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resetSysinset := func(x app.Insets) {
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resetSysinset := func(x system.Insets) {
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sysinset.Top = x.Top
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sysinset.Bottom = x.Bottom
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sysinset.Left = x.Left
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sysinset.Right = x.Right
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}
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go func() {
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labchan <- "Starting"
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}()
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for {
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select {
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case x := <-labchan:
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labels = append(labels, &text.Label{Face: face, Text: x})
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labels = append(labels, th.Body1(x))
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case e := <-w.Events():
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switch e := e.(type) {
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case app.DestroyEvent:
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case system.DestroyEvent:
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return
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case app.UpdateEvent:
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gtx.Reset(&e.Config, e.Size)
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faces.Reset(&e.Config)
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case system.FrameEvent:
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gtx.Reset(e.Config, e.Size)
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resetSysinset(e.Insets)
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sysinset.Layout(gtx, func() {
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margin.Layout(gtx, func() {
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@ -85,7 +73,7 @@ func eventloop() {
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})
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})
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})
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w.Update(gtx.Ops)
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e.Frame(gtx.Ops)
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}
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}
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}
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@ -1,9 +1,5 @@
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//+build android
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package main
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import "C"
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import (
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"fmt"
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"log"
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2
go.mod
2
go.mod
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@ -3,6 +3,6 @@ module git.wow.st/gmp/android-go
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go 1.13
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require (
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gioui.org v0.0.0-20191003113651-f3819d816490
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gioui.org v0.0.0-20191018181617-5ef176af8145
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golang.org/x/image v0.0.0-20190910094157-69e4b8554b2a
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)
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|
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24
go.sum
24
go.sum
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@ -1,9 +1,33 @@
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dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
|
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gioui.org v0.0.0-20191003113651-f3819d816490 h1:gEVjHOvnfHdfOiPCTMQuwFp5iceBK/i8QcVd44F1ejs=
|
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gioui.org v0.0.0-20191003113651-f3819d816490/go.mod h1:+CEjc9B//HrBfWsQOVxjCyih7HGIj3Pww1xFHVDZyyk=
|
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gioui.org v0.0.0-20191018144543-175144fa99b5 h1:gLTisL9HKeXoYbSXXEe6SRhy1K+FsZEyUmlnxCzIQoE=
|
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gioui.org v0.0.0-20191018144543-175144fa99b5/go.mod h1:KqFFi2Dq5gYA3FJ0sDOt8OBXoMsuxMtE8v2f0JExXAY=
|
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gioui.org v0.0.0-20191018181617-5ef176af8145 h1:7zU3Wky5H9jKAhHLsc4Zbs5uDcIh3WmW4HdnPhz997A=
|
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gioui.org v0.0.0-20191018181617-5ef176af8145/go.mod h1:KqFFi2Dq5gYA3FJ0sDOt8OBXoMsuxMtE8v2f0JExXAY=
|
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github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
|
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github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
|
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golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
|
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golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
|
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golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
|
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golang.org/x/exp v0.0.0-20191002040644-a1355ae1e2c3 h1:n9HxLrNxWWtEb1cA950nuEEj3QnKbtsCJ6KjcgisNUs=
|
||||
golang.org/x/exp v0.0.0-20191002040644-a1355ae1e2c3/go.mod h1:NOZ3BPKG0ec/BKJQgnvsSFpcKLM5xXVWnvZS97DWHgE=
|
||||
golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
|
||||
golang.org/x/image v0.0.0-20190703141733-d6a02ce849c9/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
|
||||
golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
|
||||
golang.org/x/image v0.0.0-20190910094157-69e4b8554b2a h1:gHevYm0pO4QUbwy8Dmdr01R5r1BuKtfYqRqF0h/Cbh0=
|
||||
golang.org/x/image v0.0.0-20190910094157-69e4b8554b2a/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
|
||||
golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
|
||||
golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
|
||||
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
|
||||
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
|
||||
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
|
||||
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
|
||||
golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
|
||||
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
|
||||
golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
|
||||
golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
|
||||
golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
|
||||
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
|
||||
golang.org/x/tools v0.0.0-20190927191325-030b2cf1153e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
|
||||
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user