add some codes,like this:
------------------------------
static JNINativeMethod FileBrowseMethods[] = {
{"OpenStream", "(Ljava/lang/String;)V",
(void*)Java_yuan_tang_fu_FileBrowse_OpenStream },
};
static const char *FileBrowseClassName = "yuan/tang/fu/FileBrowse";
static int registerNativeMethods(JNIEnv* env, const char* className,
JNINativeMethod* gMethods, int numMethods)
{
jclass clazz;
//fprintf(stderr, "RegisterNatives start for '%s'", className);
__android_log_print(ANDROID_LOG_ERROR,"registerNativeMethods","RegisterNatives
start for '%s'", className);
clazz = env->FindClass(className);
if (clazz == NULL) {
//fprintf(stderr, "Native registration unable to find
class '%s'",
className);
__android_log_print(ANDROID_LOG_ERROR,"registerNativeMethods",
"Native registration unable to find class '%s'", className);
return JNI_FALSE;
}
if (env->RegisterNatives(clazz, gMethods, numMethods)<0) {
//fprintf(stderr, "RegisterNatives failed for '%s'",
className);
__android_log_print(ANDROID_LOG_ERROR,"registerNativeMethods",
"RegisterNatives failed for '%s'", className);
return JNI_FALSE;
}
return JNI_TRUE;
}
static int registerNatives(JNIEnv* env)
{
if (!registerNativeMethods(env, FileBrowseClassName,
FileBrowseMethods, sizeof(FileBrowseMethods) /
sizeof(FileBrowseMethods[0]))) {
// return JNI_FALSE;
}
return JNI_TRUE;
}
typedef union {
JNIEnv* env;
void* venv;
} UnionJNIEnvToVoid;
jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
UnionJNIEnvToVoid uenv;
uenv.venv = NULL;
jint result = -1;
JNIEnv* env = NULL;
//printf("JNI_OnLoad");
__android_log_print(ANDROID_LOG_ERROR,"JNI_OnLoad",
"JNI_OnLoad...");
if (vm->GetEnv(&uenv.venv, JNI_VERSION_1_4) != JNI_OK) {
//fprintf(stderr, "GetEnv failed");
__android_log_print(ANDROID_LOG_ERROR,"JNI_OnLoad",
"GetEnv failed");
goto bail;
}
env = uenv.env;
if (registerNatives(env) != JNI_TRUE) {
//fprintf(stderr, "GetEnv failed");
__android_log_print(ANDROID_LOG_ERROR,"JNI_OnLoad",
"registerNatives failed");
goto bail;
}
result = JNI_VERSION_1_4;
bail:
return result;
}
2010/12/22 TobyKaos <[email protected]>:
> Hello, I first run samples found in androind ndk and I create my own
> in C. I successfully print a hello world with c function.
>
> but now I want to call c++ function. Then I change file extensions
> to .cpp and remake with ndk-build. Ok that seems to work fine. I
> refresh my eclispe project. Ok eclispe seems to find my hello world
> function in new .so lib made in c++.
>
> Then I launched debug and application failed because it does not find c
> ++ function. My function is the same but I modify jni function in it
> to match c++ jni.
>
> My TestSTL.java
>
> package com.project.teststl;
>
> import android.app.Activity;
> import android.os.Bundle;
> import android.widget.TextView;
>
> public class TestSTL extends Activity {
> /** Called when the activity is first created. */
> �...@override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> //setContentView(R.layout.main);
>
> TextView tv = new TextView(this);
> tv.setText( stringFromJNI() );
> setContentView(tv);
> }
>
> native public static String stringFromJNI();
>
> static {
> //System.loadLibrary("stlport_shared");
> System.loadLibrary("teststl");
> }
>
> }
>
> *************************************
> my test.cpp file
>
> #include <string.h>
> #include <jni.h>
>
> #include <stdlib.h>
> #include <stdio.h>
>
> /* Call to initialize the graphics state */
> JNIEXPORT jstring JNICALL
> Java_com_project_teststl_TestSTL_stringFromJNI( JNIEnv* env, jobject
> obj )
> {
> jstring s = (env)->NewStringUTF( "Hello from JNI !");
>
> return s;
>
> }
>
>
>
> I repeat, in C all is ok (I just modify NewStringUTF for C or C++
> because are not the same definition).
>
> Please help me.
>
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