有关JNI

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1、JNI：Java Native Interface java 本地接口

2、环境配置：修改cygwin安装目录下home/计算机名/.bash_profile文件，在文件结尾添加两句

NDK=E:/android-ndk-r8b
export NDK

3、根据java文件生成C/C++头文件：

cmd---->

cd android工程/bin文件夹下---->

生成头文件命令：javah -classpath . -jni xxx.xxx.xxx（注意中间的点，不能省）

4、android.mk文件：

# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := testjni#定义so库的文件名
LOCAL_SRC_FILES := now_lf_create_NowSo.c#编译的C或C++的文件名

LOCAL_LDLIBS+= -L$(SYSROOT)/usr/lib -llog

include $(BUILD_SHARED_LIBRARY)

5、生成so文件：

cygwin工具---->

cd jni目录(C/C++文件、头文件、android.mk文件)---->

$NDK/ndk-build(生成so)

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