I have to call from a pure c method of decoder.c to a method of Java class, and i don't know how initialize the pointers of native code that they are necessary to connect Java and C . In my project, these classes are located so:
in home/virginia/workspace/
vlc
----src
-------input
-------------decoder.c
-------misc
------------picture.c
vlc-android
----src
--------org.videolan.vlc.gui.video
---------------------------------VirtualActivity (java class)
----jni
---------Android.mk
I'm testing with simple methods to comprobe that it works fine. Then in decoder.c, i have got the next lines of code:
In decoder.c:
Code: Select all
msg_Warn( p_dec, "Definición del array");
int i;
int size = 129600;
for ( i= 0; i< size ;i++){
aux[i] = 2 ;
}
newFunction(aux) ;
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void newFunction(int color) {
JavaVM* jvm;
JNIEnv* env;
JavaVMInitArgs args;
JavaVMOption options[1];
args.version = JNI_VERSION_1_6;
args.nOptions = 1;
options[0].optionString = "-Djava.class.path=/home/virginia/workspace/android/vlc-android/src/";
args.options = options;
args.ignoreUnrecognized = JNI_FALSE;
JNI_CreateJavaVM(&jvm, (void **)&env, &args);
jclass cls = (*env)->FindClass(env,"org.videolan.vlc.gui.video.VirtualActivity");
jmethodID mid = (*env)->GetStaticMethodID(env, cls, "arrays", "([I)V");
(*env)->CallVoidMethod(env,cls, mid, color);
}
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public void arrays(int arr[]){
int i;
System.out.println("La longitud del array es" + arr.length );
for (i = 0; i < arr.length; i++) {
System.out.println("Este mensaje se está imprimiendo desde java" + ", array = " + arr[i] + " para " + " i = " + i );
}
}
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/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(picture.o): in function newFunction:../../src/misc/picture.c:646: error: undefined reference to 'JNI_CreateJavaVM'
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include $(CLEAR_VARS)
LOCAL_MODULE := native
LOCAL_SRC_FILES := ../../vlc/src/misc/picture.c
ARCH=$(ANDROID_ABI)
LOCAL_C_INCLUDES := $(VLC_SRC_DIR)/include \
$(VLC_SRC_DIR)/include/vlc \
$(ANDROID_NDK)/platforms/android-9/arch-arm/usr/include \
$(ANDROID_NDK)/platforms/android-9/arch-arm/usr/include/android \
/usr/lib/jvm/java-6-openjdk/include \
/usr/lib/jvm/java-6-openjdk/include/linux \
CPP_STATIC=$(ANDROID_NDK)/sources/cxx-stl/gnu-libstdc++$(CXXSTL)/libs/$(ARCH)/libgnustl_static.a
LOCAL_CFLAGS := -std=gnu99
ifeq ($(ARCH), armeabi)
LOCAL_CFLAGS += -DHAVE_ARMEABI
# Needed by ARMv6 Thumb1 (the System Control coprocessor/CP15 is mandatory on ARMv6)
# On newer ARM architectures we can use Thumb2
LOCAL_ARM_MODE := arm
endif
ifeq ($(ARCH), armeabi-v7a)
LOCAL_CFLAGS += -DHAVE_ARMEABI_V7A
endif
LOCAL_LDLIBS := -L$(VLC_CONTRIB)/lib \
$(VLC_MODULES) \
$(VLC_BUILD_DIR)/lib/.libs/libvlc.a \
$(VLC_BUILD_DIR)/src/.libs/libvlccore.a \
$(VLC_BUILD_DIR)/compat/.libs/libcompat.a \
[b] -L/usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server[/b] \
-ldl -lz -lm -llog \
-ldvbpsi -lebml -lmatroska -ltag \
-logg -lFLAC -ltheora \
-lmpeg2 -ldca -la52 \
-lavformat -lavcodec -lswscale -lavutil -lpostproc -lgsm -lopenjpeg \
-lliveMedia -lUsageEnvironment -lBasicUsageEnvironment -lgroupsock \
-lspeex -lspeexdsp \
-lxml2 -lpng -lgnutls -lgcrypt -lgpg-error \
-lfreetype -liconv -lass -lfribidi -lopus \
[code] -ljvm
$(CPP_STATIC)
include $(BUILD_SHARED_LIBRARY)[/code]
In the folder /usr/lib/jvm/java-6-openjdk/include is the jni.h file, where is the declaration of :
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#ifdef _JNI_IMPLEMENTATION_
#define _JNI_IMPORT_OR_EXPORT_ JNIEXPORT
#else
#define _JNI_IMPORT_OR_EXPORT_ JNIIMPORT
#endif
_JNI_IMPORT_OR_EXPORT_ jint JNICALL
JNI_GetDefaultJavaVMInitArgs(void *args);
_JNI_IMPORT_OR_EXPORT_ jint JNICALL
JNI_CreateJavaVM(JavaVM **pvm, void **penv, void *args);
_JNI_IMPORT_OR_EXPORT_ jint JNICALL
JNI_GetCreatedJavaVMs(JavaVM **, jsize, jsize *);
I'm sorry to have many doubts, but i'm beginner.
Thanks so much!