本文的主要內容：C++中呼叫java類的成員函式和靜態成員函式

1，java程式碼

public class SNaviEngineManager {

    public void sendMessage(int msg)
    {

    }

    public static int sendMessage(int msg)
    {

    }	

}

呼叫成員函式

void ms_sendmessage(int msg)
{
	
	// 獲取JNI環境
	bool attach = false;
	int status=0;
	JNIEnv* pEnv = NULL;
	status = g_jvm->GetEnv((void **) &pEnv, JNI_VERSION_1_6);  
	if( status < 0 )
	{
		LOGI("AttachCurrentThread");
		g_jvm->AttachCurrentThread(&pEnv, NULL);
		attach = true;
	}

	jmethodID mid = pEnv->GetMethodID( g_jcNaviEngine, "<init>", "()V");  
        jobject obj = pEnv->NewObject( g_jcNaviEngine, mid);
	if (obj == 0)  
	{  
		LOGE("Create object failed!");  
         }  

	// 呼叫成員方法  
        mid = pEnv->GetMethodID( g_jcNaviEngine, "sendMessage", "(I)V");
	if (mid != 0)  
	{  
		pEnv->CallVoidMethod( obj, mid, msg );	
	} 

	
	// 釋放JNI環境
	if( attach )
	{
		g_jvm->DetachCurrentThread();
	}
}
 

void ms_sendmessage(int msg)
{
	
	// 獲取JNI環境
	bool attach = false;
	int status=0;
	JNIEnv* pEnv = NULL;
	status = g_jvm->GetEnv((void **) &pEnv, JNI_VERSION_1_6);  
	if( status < 0 )
	{
		LOGI("AttachCurrentThread");
		g_jvm->AttachCurrentThread(&pEnv, NULL);
		attach = true;
	}
 

	// 呼叫靜態成員方法  
        jmethodID mid = pEnv->GetStaticMethodID( static_cast<jclass>(g_joNaviEngine), "sendMessage", "(I)V");
	if (mid != 0)  
	{  
		pEnv->CallStaticVoidMethod( obj, mid, msg );	
	} 

	
	// 釋放JNI環境
	if( attach )
	{
		g_jvm->DetachCurrentThread();
	}
}
 

在呼叫java類的成員函式時，一定要呼叫建構函式例項化java類

/** 例項化類物件 */
jobject getInstance( JNIEnv* pEnv , jclass classzz )
{
	if ( pEnv == NULL )
	{
		return NULL ;
	}

	// 獲取構造方法
	jmethodID constructor = pEnv->GetMethodID(classzz, "<init>", "()V"); 
	if (NULL == constructor) 
	{ 
		return NULL;
	}   
	// 例項化類物件  
	return pEnv->NewObject(classzz, constructor); 
}