Android：NDK中访问assets目录下文件

jobject assetManager = state_param->activity->assetManager;
AAssetManager* mgr = AAssetManager_fromJava(env, assetManager);

AAssetDir* assetDir = AAssetManager_openDir(mgr, "");

const char* filename = (const char*)NULL;
while ((filename = AAssetDir_getNextFileName(assetDir)) != NULL) {
AAsset* asset = AAssetManager_open(mgr, filename, AASSET_MODE_STREAMING);
char buf[BUFSIZ];
int nb_read = 0;
FILE* out = fopen(filename, "w");
while ((nb_read = AAsset_read(asset, buf, BUFSIZ)) > 0)
fwrite(buf, nb_read, 1, out);
fclose(out);
AAsset_close(asset);
}
AAssetDir_close(assetDir);