NDK记录

string -> char
string.c_str()

char -> string
string(char*)

拼接字符串
char* a=new char[strlen(char1)+strlen(char2)……]
sprintf(a,”formatter”,char1,char2,…..)

string aw=string(char1)+string(char2)

创建 assets

this->pEnv=env;
jclass class_activity = env->GetObjectClass (activity);
jmethodID method_resource = getMethodIdOrThrow (
		env, class_activity, "getResources", "()Landroid/content/res/Resources;");
jobject obj_resource = env->CallObjectMethod (activity, method_resource);

jclass class_resource = env->GetObjectClass (obj_resource);
jmethodID method_assets = getMethodIdOrThrow (
		env, class_resource, "getAssets", "()Landroid/content/res/AssetManager;");
jobject obj_asset = env->CallObjectMethod (obj_resource, method_assets);

this->am = AAssetManager_fromJava (env, obj_asset);

释放文件

if(0!=access(dst,F_OK))
{
	LOGD("need create %s",dst);

	ofstream m_file_o;
	m_file_o.open(dst,ios::binary|ios::out);
	if(m_file_o)
	{
		char *buffer=(char*)malloc(_BUFFER_SIZE+1);
		buffer[_BUFFER_SIZE+1]=0;
		int count=-1;
		AAsset* asset=this->open(src);
		if(NULL!=asset){
			while((count=AAsset_read(asset,buffer,_BUFFER_SIZE))>0)
			{
				m_file_o.write(buffer,count);
			}
		}
		m_file_o.close();
		AAsset_close(asset);
		delete buffer;
	}
}else{
	LOGD("%s has exist",dst);
}
return JNI_TRUE;

目录遍历
http://songlee24.github.io/2014/09/20/linux-get-directory/
DT_UNKNOWN，未知的类型
DT_REG，普通文件
DT_DIR，普通目录
DT_FIFO，命名管道或FIFO
DT_SOCK，本地套接口
DT_CHR，字符设备文件
DT_BLK，块设备文件