（一）Android jni打印到logcat

#include <stdio.h>
#include <android/log.h> 

int main(void)
{
    int a  = 0x10,b = 0x20;
    __android_log_print(ANDROID_LOG_DEBUG,"hepu_alg"," This is a Debug Info.a = 0x%x b = 0x%x\n",a,b);
    return 0;
}

Android.mk文件

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_CFLAGS    += -fno-strict-aliasing -O2 -DNDEBUG -pie -mfloat-abi=softfp -mfpu=neon


LOCAL_ARM_NEON := true

LOCAL_DISABLE_FATAL_LINKER_WARNINGS=true
LOCAL_C_INCLUDES += -I include/

LOCAL_LDLIBS := -llog

SOURCES:=$(wildcard *.c)  
LOCAL_SRC_FILES := $(SOURCES)

LOCAL_MODULE:= app

include $(BUILD_EXECUTABLE)