android_ndk_jni_cygwin环境

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android ndk下载解压缩 r4以后无需配置
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交叉编译环境cygwin下载，安装时选择 devel Install
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运行cygwin生成用户目录，修改.bash_profile，添加环境变量，例如

NDK_ROOT=/cygdrive/d/android-ndk-r5b
export NDK_ROOT
export PATH="$NDK_ROOT:$PATH"
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android项目配置

项目目录下建立jni目录，准备好make文件和代码，例如：
Android.mk
hello-jni.c
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从cygwin进入项目目录，运行ndk-build脚本，例如

cd /cygdrive/d/work/android/hello-jni
ndk-build

自动生成 libs/armeabi/libhello-jni.so

引用方法：
static {
System.loadLibrary("hello-jni");
}
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android项目属性配置Builder联动：新建Program Builder

D:/cygwin/bin/bash.exe
D:/cygwin/home/lin
--login -c "cd /cygdrive/d/work/android/hello-jni && /cygdrive/d/android-ndk-r5b/ndk-build"
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