131 lines
3.4 KiB
Go
131 lines
3.4 KiB
Go
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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