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 {
62 private static final String TAG = "SearchBookContents";
63 private static final String USER_AGENT = "ZXing (Android)";
65 private NetworkThread networkThread;
67 private EditText queryTextView;
68 private Button queryButton;
69 private ListView resultListView;
70 private TextView headerView;
72 private final Handler handler = new Handler() {
74 public void handleMessage(Message message) {
75 switch (message.what) {
76 case R.id.search_book_contents_succeeded:
77 handleSearchResults((JSONObject) message.obj);
80 case R.id.search_book_contents_failed:
82 headerView.setText(R.string.msg_sbc_failed);
88 private final Button.OnClickListener buttonListener = new Button.OnClickListener() {
89 public void onClick(View view) {
94 private final View.OnKeyListener keyListener = new View.OnKeyListener() {
95 public boolean onKey(View view, int keyCode, KeyEvent event) {
96 if (keyCode == KeyEvent.KEYCODE_ENTER) {
103 private static final Pattern TAG_PATTERN = Pattern.compile("\\<.*?\\>");
104 private static final Pattern LT_ENTITY_PATTERN = Pattern.compile("<");
105 private static final Pattern GT_ENTITY_PATTERN = Pattern.compile(">");
106 private static final Pattern QUOTE_ENTITY_PATTERN = Pattern.compile("'");
107 private static final Pattern QUOT_ENTITY_PATTERN = Pattern.compile(""");
110 public void onCreate(Bundle icicle) {
111 super.onCreate(icicle);
113 // Make sure that expired cookies are removed on launch.
114 CookieSyncManager.createInstance(this);
115 CookieManager.getInstance().removeExpiredCookie();
117 Intent intent = getIntent();
118 if (intent == null || (!intent.getAction().equals(Intents.SearchBookContents.ACTION))) {
123 isbn = intent.getStringExtra(Intents.SearchBookContents.ISBN);
124 setTitle(getString(R.string.sbc_name) + ": ISBN " + isbn);
126 setContentView(R.layout.search_book_contents);
127 queryTextView = (EditText) findViewById(R.id.query_text_view);
129 String initialQuery = intent.getStringExtra(Intents.SearchBookContents.QUERY);
130 if (initialQuery != null && initialQuery.length() > 0) {
131 // Populate the search box but don't trigger the search
132 queryTextView.setText(initialQuery);
134 queryTextView.setOnKeyListener(keyListener);
136 queryButton = (Button) findViewById(R.id.query_button);
137 queryButton.setOnClickListener(buttonListener);
139 resultListView = (ListView) findViewById(R.id.result_list_view);
140 LayoutInflater factory = LayoutInflater.from(this);
141 headerView = (TextView) factory.inflate(R.layout.search_book_contents_header,
142 resultListView, false);
143 resultListView.addHeaderView(headerView);
147 protected void onResume() {
149 queryTextView.selectAll();
153 public void onConfigurationChanged(Configuration config) {
154 // Do nothing, this is to prevent the activity from being restarted when the keyboard opens.
155 super.onConfigurationChanged(config);
158 private void resetForNewQuery() {
159 networkThread = null;
160 queryTextView.setEnabled(true);
161 queryTextView.selectAll();
162 queryButton.setEnabled(true);
165 private void launchSearch() {
166 if (networkThread == null) {
167 String query = queryTextView.getText().toString();
168 if (query != null && query.length() > 0) {
169 networkThread = new NetworkThread(isbn, query, handler);
170 networkThread.start();
171 headerView.setText(R.string.msg_sbc_searching_book);
172 resultListView.setAdapter(null);
173 queryTextView.setEnabled(false);
174 queryButton.setEnabled(false);
179 // Currently there is no way to distinguish between a query which had no results and a book
180 // which is not searchable - both return zero results.
181 private void handleSearchResults(JSONObject json) {
183 int count = json.getInt("number_of_results");
184 headerView.setText("Found " + (count == 1 ? "1 result" : count + " results"));
186 JSONArray results = json.getJSONArray("search_results");
187 SearchBookContentsResult.setQuery(queryTextView.getText().toString());
188 List<SearchBookContentsResult> items = new ArrayList<SearchBookContentsResult>(count);
189 for (int x = 0; x < count; x++) {
190 items.add(parseResult(results.getJSONObject(x)));
192 resultListView.setAdapter(new SearchBookContentsAdapter(this, items));
194 String searchable = json.optString("searchable");
195 if ("false".equals(searchable)) {
196 headerView.setText(R.string.msg_sbc_book_not_searchable);
198 resultListView.setAdapter(null);
200 } catch (JSONException e) {
201 Log.e(TAG, e.toString());
202 resultListView.setAdapter(null);
203 headerView.setText(R.string.msg_sbc_failed);
207 // Available fields: page_number, page_id, page_url, snippet_text
208 private SearchBookContentsResult parseResult(JSONObject json) {
210 String pageNumber = json.getString("page_number");
211 if (pageNumber.length() > 0) {
212 pageNumber = getString(R.string.msg_sbc_page) + ' ' + pageNumber;
214 // This can happen for text on the jacket, and possibly other reasons.
215 pageNumber = getString(R.string.msg_sbc_unknown_page);
218 // Remove all HTML tags and encoded characters. Ideally the server would do this.
219 String snippet = json.optString("snippet_text");
220 boolean valid = true;
221 if (snippet.length() > 0) {
222 snippet = TAG_PATTERN.matcher(snippet).replaceAll("");
223 snippet = LT_ENTITY_PATTERN.matcher(snippet).replaceAll("<");
224 snippet = GT_ENTITY_PATTERN.matcher(snippet).replaceAll(">");
225 snippet = QUOTE_ENTITY_PATTERN.matcher(snippet).replaceAll("'");
226 snippet = QUOT_ENTITY_PATTERN.matcher(snippet).replaceAll("\"");
228 snippet = '(' + getString(R.string.msg_sbc_snippet_unavailable) + ')';
231 return new SearchBookContentsResult(pageNumber, snippet, valid);
232 } catch (JSONException e) {
233 // Never seen in the wild, just being complete.
234 return new SearchBookContentsResult(getString(R.string.msg_sbc_no_page_returned), "", false);
238 private static final class NetworkThread extends Thread {
239 private final String isbn;
240 private final String query;
241 private final Handler handler;
243 NetworkThread(String isbn, String query, Handler handler) {
246 this.handler = handler;
251 AndroidHttpClient client = null;
253 // These return a JSON result which describes if and where the query was found. This API may
254 // break or disappear at any time in the future. Since this is an API call rather than a
255 // website, we don't use LocaleManager to change the TLD.
256 URI uri = new URI("http", null, "www.google.com", -1, "/books", "vid=isbn" + isbn +
257 "&jscmd=SearchWithinVolume2&q=" + query, null);
258 HttpUriRequest get = new HttpGet(uri);
259 get.setHeader("cookie", getCookie(uri.toString()));
260 client = AndroidHttpClient.newInstance(USER_AGENT);
261 HttpResponse response = client.execute(get);
262 if (response.getStatusLine().getStatusCode() == 200) {
263 HttpEntity entity = response.getEntity();
264 ByteArrayOutputStream jsonHolder = new ByteArrayOutputStream();
265 entity.writeTo(jsonHolder);
267 JSONObject json = new JSONObject(jsonHolder.toString(getEncoding(entity)));
270 Message message = Message.obtain(handler, R.id.search_book_contents_succeeded);
272 message.sendToTarget();
274 Log.e(TAG, "HTTP returned " + response.getStatusLine().getStatusCode() + " for " + uri);
275 Message message = Message.obtain(handler, R.id.search_book_contents_failed);
276 message.sendToTarget();
278 } catch (Exception e) {
279 Log.e(TAG, e.toString());
280 Message message = Message.obtain(handler, R.id.search_book_contents_failed);
281 message.sendToTarget();
283 if (client != null) {
289 // Book Search requires a cookie to work, which we store persistently. If the cookie does
290 // not exist, this could be the first search or it has expired. Either way, do a quick HEAD
291 // request to fetch it, save it via the CookieSyncManager to flash, then return it.
292 private static String getCookie(String url) {
293 String cookie = CookieManager.getInstance().getCookie(url);
294 if (cookie == null || cookie.length() == 0) {
295 Log.v(TAG, "Book Search cookie was missing or expired");
296 HttpUriRequest head = new HttpHead(url);
297 AndroidHttpClient client = AndroidHttpClient.newInstance(USER_AGENT);
299 HttpResponse response = client.execute(head);
300 if (response.getStatusLine().getStatusCode() == 200) {
301 Header[] cookies = response.getHeaders("set-cookie");
302 for (Header theCookie : cookies) {
303 CookieManager.getInstance().setCookie(url, theCookie.getValue());
305 CookieSyncManager.getInstance().sync();
306 cookie = CookieManager.getInstance().getCookie(url);
308 } catch (IOException e) {
309 Log.e(TAG, e.toString());
316 private static String getEncoding(HttpEntity entity) {
317 // FIXME: The server is returning ISO-8859-1 but the content is actually windows-1252.
318 // Once Jeff fixes the HTTP response, remove this hardcoded value and go back to getting
319 // the encoding dynamically.
320 return "windows-1252";
321 // HeaderElement[] elements = entity.getContentType().getElements();
322 // if (elements != null && elements.length > 0) {
323 // String encoding = elements[0].getParameterByName("charset").getValue();
324 // if (encoding != null && encoding.length() > 0) {