2 * Copyright (C) 2008 ZXing authors
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 package com.google.zxing.client.android.book;
19 import android.app.Activity;
20 import android.content.Intent;
21 import android.content.res.Configuration;
22 import android.os.Bundle;
23 import android.os.Handler;
24 import android.os.Message;
25 import android.util.Log;
26 import android.view.KeyEvent;
27 import android.view.LayoutInflater;
28 import android.view.View;
29 import android.webkit.CookieManager;
30 import android.webkit.CookieSyncManager;
31 import android.widget.Button;
32 import android.widget.EditText;
33 import android.widget.ListView;
34 import android.widget.TextView;
35 import org.apache.http.Header;
36 import org.apache.http.HttpEntity;
37 import org.apache.http.HttpResponse;
38 import org.apache.http.client.methods.HttpGet;
39 import org.apache.http.client.methods.HttpHead;
40 import org.apache.http.client.methods.HttpUriRequest;
41 import org.json.JSONArray;
42 import org.json.JSONException;
43 import org.json.JSONObject;
45 import java.io.ByteArrayOutputStream;
46 import java.io.IOException;
48 import java.util.ArrayList;
49 import java.util.List;
50 import java.util.regex.Pattern;
52 import com.google.zxing.client.android.R;
53 import com.google.zxing.client.android.Intents;
54 import com.google.zxing.client.android.AndroidHttpClient;
57 * Uses Google Book Search to find a word or phrase in the requested book.
59 * @author dswitkin@google.com (Daniel Switkin)
61 public final class SearchBookContentsActivity extends Activity {
63 private static final String TAG = "SearchBookContents";
64 private static final String USER_AGENT = "ZXing (Android)";
65 private static final Pattern TAG_PATTERN = Pattern.compile("\\<.*?\\>");
66 private static final Pattern LT_ENTITY_PATTERN = Pattern.compile("<");
67 private static final Pattern GT_ENTITY_PATTERN = Pattern.compile(">");
68 private static final Pattern QUOTE_ENTITY_PATTERN = Pattern.compile("'");
69 private static final Pattern QUOT_ENTITY_PATTERN = Pattern.compile(""");
71 private NetworkThread networkThread;
73 private EditText queryTextView;
74 private Button queryButton;
75 private ListView resultListView;
76 private TextView headerView;
78 private final Handler handler = new Handler() {
80 public void handleMessage(Message message) {
81 switch (message.what) {
82 case R.id.search_book_contents_succeeded:
83 handleSearchResults((JSONObject) message.obj);
86 case R.id.search_book_contents_failed:
88 headerView.setText(R.string.msg_sbc_failed);
94 private final Button.OnClickListener buttonListener = new Button.OnClickListener() {
95 public void onClick(View view) {
100 private final View.OnKeyListener keyListener = new View.OnKeyListener() {
101 public boolean onKey(View view, int keyCode, KeyEvent event) {
102 if (keyCode == KeyEvent.KEYCODE_ENTER) {
115 public void onCreate(Bundle icicle) {
116 super.onCreate(icicle);
118 // Make sure that expired cookies are removed on launch.
119 CookieSyncManager.createInstance(this);
120 CookieManager.getInstance().removeExpiredCookie();
122 Intent intent = getIntent();
123 if (intent == null || (!intent.getAction().equals(Intents.SearchBookContents.ACTION))) {
128 isbn = intent.getStringExtra(Intents.SearchBookContents.ISBN);
129 if (isbn.startsWith("http://google.com/books?id=")) {
130 setTitle(getString(R.string.sbc_name));
132 setTitle(getString(R.string.sbc_name) + ": ISBN " + isbn);
135 setContentView(R.layout.search_book_contents);
136 queryTextView = (EditText) findViewById(R.id.query_text_view);
138 String initialQuery = intent.getStringExtra(Intents.SearchBookContents.QUERY);
139 if (initialQuery != null && initialQuery.length() > 0) {
140 // Populate the search box but don't trigger the search
141 queryTextView.setText(initialQuery);
143 queryTextView.setOnKeyListener(keyListener);
145 queryButton = (Button) findViewById(R.id.query_button);
146 queryButton.setOnClickListener(buttonListener);
148 resultListView = (ListView) findViewById(R.id.result_list_view);
149 LayoutInflater factory = LayoutInflater.from(this);
150 headerView = (TextView) factory.inflate(R.layout.search_book_contents_header,
151 resultListView, false);
152 resultListView.addHeaderView(headerView);
156 protected void onResume() {
158 queryTextView.selectAll();
162 public void onConfigurationChanged(Configuration config) {
163 // Do nothing, this is to prevent the activity from being restarted when the keyboard opens.
164 super.onConfigurationChanged(config);
167 private void resetForNewQuery() {
168 networkThread = null;
169 queryTextView.setEnabled(true);
170 queryTextView.selectAll();
171 queryButton.setEnabled(true);
174 private void launchSearch() {
175 if (networkThread == null) {
176 String query = queryTextView.getText().toString();
177 if (query != null && query.length() > 0) {
178 networkThread = new NetworkThread(isbn, query, handler);
179 networkThread.start();
180 headerView.setText(R.string.msg_sbc_searching_book);
181 resultListView.setAdapter(null);
182 queryTextView.setEnabled(false);
183 queryButton.setEnabled(false);
188 // Currently there is no way to distinguish between a query which had no results and a book
189 // which is not searchable - both return zero results.
190 private void handleSearchResults(JSONObject json) {
192 int count = json.getInt("number_of_results");
193 headerView.setText("Found " + (count == 1 ? "1 result" : count + " results"));
195 JSONArray results = json.getJSONArray("search_results");
196 SearchBookContentsResult.setQuery(queryTextView.getText().toString());
197 List<SearchBookContentsResult> items = new ArrayList<SearchBookContentsResult>(count);
198 for (int x = 0; x < count; x++) {
199 items.add(parseResult(results.getJSONObject(x)));
201 resultListView.setOnItemClickListener(new BrowseBookListener(this, items));
202 resultListView.setAdapter(new SearchBookContentsAdapter(this, items));
204 String searchable = json.optString("searchable");
205 if ("false".equals(searchable)) {
206 headerView.setText(R.string.msg_sbc_book_not_searchable);
208 resultListView.setAdapter(null);
210 } catch (JSONException e) {
211 Log.e(TAG, e.toString());
212 resultListView.setAdapter(null);
213 headerView.setText(R.string.msg_sbc_failed);
217 // Available fields: page_id, page_number, page_url, snippet_text
218 private SearchBookContentsResult parseResult(JSONObject json) {
220 String pageId = json.getString("page_id");
221 String pageNumber = json.getString("page_number");
222 if (pageNumber.length() > 0) {
223 pageNumber = getString(R.string.msg_sbc_page) + ' ' + pageNumber;
225 // This can happen for text on the jacket, and possibly other reasons.
226 pageNumber = getString(R.string.msg_sbc_unknown_page);
229 // Remove all HTML tags and encoded characters. Ideally the server would do this.
230 String snippet = json.optString("snippet_text");
231 boolean valid = true;
232 if (snippet.length() > 0) {
233 snippet = TAG_PATTERN.matcher(snippet).replaceAll("");
234 snippet = LT_ENTITY_PATTERN.matcher(snippet).replaceAll("<");
235 snippet = GT_ENTITY_PATTERN.matcher(snippet).replaceAll(">");
236 snippet = QUOTE_ENTITY_PATTERN.matcher(snippet).replaceAll("'");
237 snippet = QUOT_ENTITY_PATTERN.matcher(snippet).replaceAll("\"");
239 snippet = '(' + getString(R.string.msg_sbc_snippet_unavailable) + ')';
242 return new SearchBookContentsResult(pageId, pageNumber, snippet, valid);
243 } catch (JSONException e) {
244 // Never seen in the wild, just being complete.
245 return new SearchBookContentsResult(getString(R.string.msg_sbc_no_page_returned), "", "", false);
249 private static final class NetworkThread extends Thread {
250 private final String isbn;
251 private final String query;
252 private final Handler handler;
254 NetworkThread(String isbn, String query, Handler handler) {
257 this.handler = handler;
262 AndroidHttpClient client = null;
264 // These return a JSON result which describes if and where the query was found. This API may
265 // break or disappear at any time in the future. Since this is an API call rather than a
266 // website, we don't use LocaleManager to change the TLD.
268 if (isbn.startsWith("http://google.com/books?id=")) {
269 int equals = isbn.indexOf('=');
270 String volumeId = isbn.substring(equals + 1);
271 uri = new URI("http", null, "www.google.com", -1, "/books", "id=" + volumeId +
272 "&jscmd=SearchWithinVolume2&q=" + query, null);
274 uri = new URI("http", null, "www.google.com", -1, "/books", "vid=isbn" + isbn +
275 "&jscmd=SearchWithinVolume2&q=" + query, null);
277 HttpUriRequest get = new HttpGet(uri);
278 get.setHeader("cookie", getCookie(uri.toString()));
279 client = AndroidHttpClient.newInstance(USER_AGENT);
280 HttpResponse response = client.execute(get);
281 if (response.getStatusLine().getStatusCode() == 200) {
282 HttpEntity entity = response.getEntity();
283 ByteArrayOutputStream jsonHolder = new ByteArrayOutputStream();
284 entity.writeTo(jsonHolder);
286 JSONObject json = new JSONObject(jsonHolder.toString(getEncoding(entity)));
289 Message message = Message.obtain(handler, R.id.search_book_contents_succeeded);
291 message.sendToTarget();
293 Log.e(TAG, "HTTP returned " + response.getStatusLine().getStatusCode() + " for " + uri);
294 Message message = Message.obtain(handler, R.id.search_book_contents_failed);
295 message.sendToTarget();
297 } catch (Exception e) {
298 Log.e(TAG, e.toString());
299 Message message = Message.obtain(handler, R.id.search_book_contents_failed);
300 message.sendToTarget();
302 if (client != null) {
308 // Book Search requires a cookie to work, which we store persistently. If the cookie does
309 // not exist, this could be the first search or it has expired. Either way, do a quick HEAD
310 // request to fetch it, save it via the CookieSyncManager to flash, then return it.
311 private static String getCookie(String url) {
312 String cookie = CookieManager.getInstance().getCookie(url);
313 if (cookie == null || cookie.length() == 0) {
314 Log.v(TAG, "Book Search cookie was missing or expired");
315 HttpUriRequest head = new HttpHead(url);
316 AndroidHttpClient client = AndroidHttpClient.newInstance(USER_AGENT);
318 HttpResponse response = client.execute(head);
319 if (response.getStatusLine().getStatusCode() == 200) {
320 Header[] cookies = response.getHeaders("set-cookie");
321 for (Header theCookie : cookies) {
322 CookieManager.getInstance().setCookie(url, theCookie.getValue());
324 CookieSyncManager.getInstance().sync();
325 cookie = CookieManager.getInstance().getCookie(url);
327 } catch (IOException e) {
328 Log.e(TAG, e.toString());
335 private static String getEncoding(HttpEntity entity) {
336 // FIXME: The server is returning ISO-8859-1 but the content is actually windows-1252.
337 // Once Jeff fixes the HTTP response, remove this hardcoded value and go back to getting
338 // the encoding dynamically.
339 return "windows-1252";
340 // HeaderElement[] elements = entity.getContentType().getElements();
341 // if (elements != null && elements.length > 0) {
342 // String encoding = elements[0].getParameterByName("charset").getValue();
343 // if (encoding != null && encoding.length() > 0) {