import com.google.samples.apps.iosched.io.model.DataManifest; //导入依赖的package包/类
/**
 * Process the data manifest and download data files referenced from it.
 * @param manifestJson The JSON of the manifest file.
 * @return The contents of the set of files referenced from the manifest, or null
 * if none could be retrieved.
 * @throws IOException If an error occurs while retrieving information.
 */
private String[] processManifest(String manifestJson) throws IOException {
    LOGD(TAG, "Processing data manifest, length " + manifestJson.length());

    DataManifest manifest = new Gson().fromJson(manifestJson, DataManifest.class);
    if (manifest.format == null || !manifest.format.equals(MANIFEST_FORMAT)) {
        LOGE(TAG, "Manifest has invalid format spec: " + manifest.format);
        throw new IOException("Invalid format spec on manifest:" + manifest.format);
    }

    if (manifest.data_files == null || manifest.data_files.length == 0) {
        LOGW(TAG, "Manifest does not list any files. Nothing done.");
        return null;
    }

    LOGD(TAG, "Manifest lists " + manifest.data_files.length + " data files.");
    String[] jsons = new String[manifest.data_files.length];
    for (int i = 0; i < manifest.data_files.length; i++) {
        String url = manifest.data_files[i];
        LOGD(TAG, "Processing data file: " + sanitizeUrl(url));
        jsons[i] = fetchFile(url);
        if (TextUtils.isEmpty(jsons[i])) {
            LOGE(TAG, "Failed to fetch data file: " + sanitizeUrl(url));
            throw new IOException("Failed to fetch data file " + sanitizeUrl(url));
        }
    }

    LOGD(TAG, "Got " + jsons.length + " data files.");
    cleanUpCache();
    return jsons;
}
 

import com.google.samples.apps.iosched.io.model.DataManifest; //导入依赖的package包/类
/**
 * Process the data manifest and download data files referenced from it.
 *
 * @param manifestJson The JSON of the manifest file.
 * @return The contents of the set of files referenced from the manifest, or null if none could
 * be retrieved.
 * @throws IOException If an error occurs while retrieving information.
 */
private String[] processManifest(String manifestJson) throws IOException {
    LOGD(TAG, "Processing data manifest, length " + manifestJson.length());

    DataManifest manifest = new Gson().fromJson(manifestJson, DataManifest.class);
    if (manifest.format == null || !manifest.format.equals(MANIFEST_FORMAT)) {
        LOGE(TAG, "Manifest has invalid format spec: " + manifest.format);
        throw new IOException("Invalid format spec on manifest:" + manifest.format);
    }

    if (manifest.data_files == null || manifest.data_files.length == 0) {
        LOGW(TAG, "Manifest does not list any files. Nothing done.");
        return null;
    }

    LOGD(TAG, "Manifest lists " + manifest.data_files.length + " data files.");
    String[] jsons = new String[manifest.data_files.length];
    for (int i = 0; i < manifest.data_files.length; i++) {
        String url = manifest.data_files[i];
        LOGD(TAG, "Processing data file: " + sanitizeUrl(url));
        jsons[i] = fetchFile(url);
        if (TextUtils.isEmpty(jsons[i])) {
            LOGE(TAG, "Failed to fetch data file: " + sanitizeUrl(url));
            throw new IOException("Failed to fetch data file " + sanitizeUrl(url));
        }
    }

    LOGD(TAG, "Got " + jsons.length + " data files.");
    cleanUpCache();
    return jsons;
}