We know that java could through JNI to call native C/C++ function.
SimpleJNI is Android example code.
I have modified for implementing BT enable/disable, just through JNI.
Step 1. modify Android which in SimpleJNI/jni this folder
LOCAL_MODULE_TAGS := samples
# This is the target being built.
LOCAL_MODULE:= libsimplejni
# All of the source files that we will compile.
LOCAL_SRC_FILES:= \
native.cpp
# All of the shared libraries we link against.
LOCAL_SHARED_LIBRARIES := \
libutils \
libbluedroid libdbus
# No static libraries.
LOCAL_STATIC_LIBRARIES := \
# Also need the JNI headers.
LOCAL_C_INCLUDES += \
$(JNI_H_INCLUDE) \
external/dbus \
system/bluetooth/bluez-clean-headers \
external/bluez/libs/include \
system/bluetooth/bluedroid/include
# No special compiler flags.
LOCAL_CFLAGS +=
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
LOCAL_LDLIBS += -lpthread -ldl
#---------------------------------------------------------
# Don't prelink this library. For more efficient code, you may want
# to add this library to the prelink map and set this to true. However,
# it's difficult to do this for applications that are not supplied as
# part of a system image.
LOCAL_PRELINK_MODULE := false
include $(BUILD_SHARED_LIBRARY)
Step2. Add the native function into your java code
static jint
add(JNIEnv *env, jobject thiz, jint a, jint b) {
int result = a + b;
LOGI("%d + %d = %d", a, b, result);
return result;
}
//enable bt JNI function
static jint
enableBT(JNIEnv *env, jobject thiz) {
LOGV(__FUNCTION__);
return bt_enable();
}
//disable bt JNI function
static jint
disableBT(JNIEnv *env, jobject thiz) {
LOGV(__FUNCTION__);
return bt_disable();
}
static const char *classPathName = "com/example/android/simplejni/Native";
static JNINativeMethod methods[] = {
{"add", "(II)I", (void*)add },
//Add you JNI native function
{"enableBT", "()I", (void*)enableBT },
{"disableBT", "()I", (void*)disableBT },
};
Step3. Compile SimpleJNI
Enter android this folder and type command #make SimpleJNI
It will generate two files - SimpleJNI.apk and libsimplejni.so
Put these files into your devices and execute the AP.
You will see the log will call into C/CPP function for bluetooh
chow it.........
留言列表
Reference Links 