Java tutorial
/* * Copyright 2011 ZXing authors * * 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. */ package de.hscoburg.etif.vbis.lagerix.android.barcode.result.supplement; import java.io.IOException; import java.util.ArrayList; import java.util.Collection; import android.content.Context; import android.widget.TextView; import de.hscoburg.etif.vbis.lagerix.android.barcode.HttpHelper; import de.hscoburg.etif.vbis.lagerix.android.barcode.LocaleManager; import de.hscoburg.etif.vbis.lagerix.android.barcode.R; import de.hscoburg.etif.vbis.lagerix.android.barcode.history.HistoryManager; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import org.json.JSONTokener; /** * @author Kamil Kaczmarczyk * @author Sean Owen */ final class BookResultInfoRetriever extends SupplementalInfoRetriever { private final String isbn; private final String source; private final Context context; BookResultInfoRetriever(TextView textView, String isbn, HistoryManager historyManager, Context context) { super(textView, historyManager); this.isbn = isbn; this.source = context.getString(R.string.msg_google_books); this.context = context; } @Override void retrieveSupplementalInfo() throws IOException { CharSequence contents = HttpHelper.downloadViaHttp( "https://www.googleapis.com/books/v1/volumes?q=isbn:" + isbn, HttpHelper.ContentType.JSON); if (contents.length() == 0) { return; } String title; String pages; Collection<String> authors = null; try { JSONObject topLevel = (JSONObject) new JSONTokener(contents.toString()).nextValue(); JSONArray items = topLevel.optJSONArray("items"); if (items == null || items.isNull(0)) { return; } JSONObject volumeInfo = ((JSONObject) items.get(0)).getJSONObject("volumeInfo"); if (volumeInfo == null) { return; } title = volumeInfo.optString("title"); pages = volumeInfo.optString("pageCount"); JSONArray authorsArray = volumeInfo.optJSONArray("authors"); if (authorsArray != null && !authorsArray.isNull(0)) { authors = new ArrayList<String>(authorsArray.length()); for (int i = 0; i < authorsArray.length(); i++) { authors.add(authorsArray.getString(i)); } } } catch (JSONException e) { throw new IOException(e.toString()); } Collection<String> newTexts = new ArrayList<String>(); maybeAddText(title, newTexts); maybeAddTextSeries(authors, newTexts); maybeAddText(pages == null || pages.length() == 0 ? null : pages + "pp.", newTexts); String baseBookUri = "http://www.google." + LocaleManager.getBookSearchCountryTLD(context) + "/search?tbm=bks&source=zxing&q="; append(isbn, source, newTexts.toArray(new String[newTexts.size()]), baseBookUri + isbn); } }