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;
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.json.JSONArray;
41 import org.json.JSONException;
42 import org.json.JSONObject;
44 import java.io.ByteArrayOutputStream;
45 import java.io.IOException;
47 import java.net.URLEncoder;
48 import java.util.ArrayList;
49 import java.util.List;
51 public final class SearchBookContentsActivity extends Activity {
53 private static final String TAG = "SearchBookContents";
55 // These return a JSON result which describes if and where the query was found. This API may
56 // break or disappear at any time in the future. Since this is an API call rather than a website,
57 // we don't use LocaleManager to change the TLD.
58 private static final String BOOK_SEARCH_URL = "//www.google.com/books?vid=isbn";
59 private static final String BOOK_SEARCH_COMMAND = "&jscmd=SearchWithinVolume2&q=";
61 private NetworkThread mNetworkThread;
63 private EditText mQueryTextView;
64 private Button mQueryButton;
65 private ListView mResultListView;
66 private TextView mHeaderView;
67 private String mUserAgent;
70 public void onCreate(Bundle icicle) {
71 super.onCreate(icicle);
73 // Make sure that expired cookies are removed on launch.
74 CookieSyncManager.createInstance(this);
75 CookieManager.getInstance().removeExpiredCookie();
77 Intent intent = getIntent();
78 if (intent == null || (!intent.getAction().equals(Intents.SearchBookContents.ACTION) &&
79 !intent.getAction().equals(Intents.SearchBookContents.DEPRECATED_ACTION))) {
84 mISBN = intent.getStringExtra(Intents.SearchBookContents.ISBN);
85 setTitle(getString(R.string.sbc_name) + ": ISBN " + mISBN);
87 setContentView(R.layout.search_book_contents);
88 mQueryTextView = (EditText) findViewById(R.id.query_text_view);
90 String initialQuery = intent.getStringExtra(Intents.SearchBookContents.QUERY);
91 if (initialQuery != null && initialQuery.length() > 0) {
92 // Populate the search box but don't trigger the search
93 mQueryTextView.setText(initialQuery);
95 mQueryTextView.setOnKeyListener(mKeyListener);
97 mQueryButton = (Button) findViewById(R.id.query_button);
98 mQueryButton.setOnClickListener(mButtonListener);
100 mResultListView = (ListView) findViewById(R.id.result_list_view);
101 LayoutInflater factory = LayoutInflater.from(this);
102 mHeaderView = (TextView) factory.inflate(R.layout.search_book_contents_header,
103 mResultListView, false);
104 mResultListView.addHeaderView(mHeaderView);
106 mUserAgent = getString(R.string.zxing_user_agent);
110 protected void onResume() {
112 mQueryTextView.selectAll();
116 public void onConfigurationChanged(Configuration config) {
117 // Do nothing, this is to prevent the activity from being restarted when the keyboard opens.
118 super.onConfigurationChanged(config);
121 public final Handler mHandler = new Handler() {
122 public void handleMessage(Message message) {
123 switch (message.what) {
124 case R.id.search_book_contents_succeeded:
125 handleSearchResults((JSONObject) message.obj);
128 case R.id.search_book_contents_failed:
130 mHeaderView.setText(R.string.msg_sbc_failed);
136 private void resetForNewQuery() {
137 mNetworkThread = null;
138 mQueryTextView.setEnabled(true);
139 mQueryTextView.selectAll();
140 mQueryButton.setEnabled(true);
143 private final Button.OnClickListener mButtonListener = new Button.OnClickListener() {
144 public void onClick(View view) {
149 private final View.OnKeyListener mKeyListener = new View.OnKeyListener() {
150 public boolean onKey(View view, int keyCode, KeyEvent event) {
151 if (keyCode == KeyEvent.KEYCODE_ENTER) {
159 private void launchSearch() {
160 if (mNetworkThread == null) {
161 String query = mQueryTextView.getText().toString();
162 if (query != null && query.length() > 0) {
163 mNetworkThread = new NetworkThread(mISBN, query, mHandler, mUserAgent);
164 mNetworkThread.start();
165 mHeaderView.setText(R.string.msg_sbc_searching_book);
166 mResultListView.setAdapter(null);
167 mQueryTextView.setEnabled(false);
168 mQueryButton.setEnabled(false);
173 // Currently there is no way to distinguish between a query which had no results and a book
174 // which is not searchable - both return zero results.
175 private void handleSearchResults(JSONObject json) {
177 int count = json.getInt("number_of_results");
178 mHeaderView.setText("Found " + ((count == 1) ? "1 result" : count + " results"));
180 JSONArray results = json.getJSONArray("search_results");
181 SearchBookContentsResult.setQuery(mQueryTextView.getText().toString());
182 List<SearchBookContentsResult> items = new ArrayList<SearchBookContentsResult>(count);
183 for (int x = 0; x < count; x++) {
184 items.add(parseResult(results.getJSONObject(x)));
186 mResultListView.setAdapter(new SearchBookContentsAdapter(this, items));
188 mResultListView.setAdapter(null);
190 } catch (JSONException e) {
191 Log.e(TAG, e.toString());
192 mResultListView.setAdapter(null);
193 mHeaderView.setText(R.string.msg_sbc_failed);
197 // Available fields: page_number, page_id, page_url, snippet_text
198 private SearchBookContentsResult parseResult(JSONObject json) {
200 String pageNumber = json.getString("page_number");
201 if (pageNumber.length() > 0) {
202 pageNumber = getString(R.string.msg_sbc_page) + " " + pageNumber;
204 // This can happen for text on the jacket, and possibly other reasons.
205 pageNumber = getString(R.string.msg_sbc_unknown_page);
208 // Remove all HTML tags and encoded characters. Ideally the server would do this.
209 String snippet = json.optString("snippet_text");
210 boolean valid = true;
211 if (snippet.length() > 0) {
212 snippet = snippet.replaceAll("\\<.*?\\>", "");
213 snippet = snippet.replaceAll("<", "<");
214 snippet = snippet.replaceAll(">", ">");
215 snippet = snippet.replaceAll("'", "'");
216 snippet = snippet.replaceAll(""", "\"");
218 snippet = "(" + getString(R.string.msg_sbc_snippet_unavailable) + ")";
221 return new SearchBookContentsResult(pageNumber, snippet, valid);
222 } catch (JSONException e) {
223 // Never seen in the wild, just being complete.
224 return new SearchBookContentsResult(getString(R.string.msg_sbc_no_page_returned), "", false);
228 private static class NetworkThread extends Thread {
230 private final String mISBN;
231 private final String mQuery;
232 private final Handler mHandler;
233 private String mUserAgent;
235 public NetworkThread(String isbn, String query, Handler handler, String userAgent) {
239 mUserAgent = userAgent;
243 AndroidHttpClient client = null;
245 String url = BOOK_SEARCH_URL + mISBN + BOOK_SEARCH_COMMAND + URLEncoder.encode(mQuery, "UTF8");
246 URI uri = new URI("http", url, null);
247 HttpGet get = new HttpGet(uri);
248 get.setHeader("cookie", getCookie("http:" + url));
249 client = AndroidHttpClient.newInstance(mUserAgent);
250 HttpResponse response = client.execute(get);
251 if (response.getStatusLine().getStatusCode() == 200) {
252 HttpEntity entity = response.getEntity();
253 ByteArrayOutputStream jsonHolder = new ByteArrayOutputStream();
254 entity.writeTo(jsonHolder);
256 JSONObject json = new JSONObject(jsonHolder.toString(getEncoding(entity)));
259 Message message = Message.obtain(mHandler, R.id.search_book_contents_succeeded);
261 message.sendToTarget();
263 Log.e(TAG, "HTTP returned " + response.getStatusLine().getStatusCode() +
265 Message message = Message.obtain(mHandler, R.id.search_book_contents_failed);
266 message.sendToTarget();
268 } catch (Exception e) {
269 Log.e(TAG, e.toString());
270 Message message = Message.obtain(mHandler, R.id.search_book_contents_failed);
271 message.sendToTarget();
273 if (client != null) {
279 // Book Search requires a cookie to work, which we store persistently. If the cookie does
280 // not exist, this could be the first search or it has expired. Either way, do a quick HEAD
281 // request to fetch it, save it via the CookieSyncManager to flash, then return it.
282 private String getCookie(String url) {
283 String cookie = CookieManager.getInstance().getCookie(url);
284 if (cookie == null || cookie.length() == 0) {
285 Log.v(TAG, "Book Search cookie was missing or expired");
286 HttpHead head = new HttpHead(url);
287 AndroidHttpClient client = AndroidHttpClient.newInstance(mUserAgent);
289 HttpResponse response = client.execute(head);
290 if (response.getStatusLine().getStatusCode() == 200) {
291 Header[] cookies = response.getHeaders("set-cookie");
292 for (int x = 0; x < cookies.length; x++) {
293 CookieManager.getInstance().setCookie(url, cookies[x].getValue());
295 CookieSyncManager.getInstance().sync();
296 cookie = CookieManager.getInstance().getCookie(url);
298 } catch (IOException e) {
299 Log.e(TAG, e.toString());
306 private String getEncoding(HttpEntity entity) {
307 // FIXME: The server is returning ISO-8859-1 but the content is actually windows-1252.
308 // Once Jeff fixes the HTTP response, remove this hardcoded value and go back to getting
309 // the encoding dynamically.
310 return "windows-1252";
311 // HeaderElement[] elements = entity.getContentType().getElements();
312 // if (elements != null && elements.length > 0) {
313 // String encoding = elements[0].getParameterByName("charset").getValue();
314 // if (encoding != null && encoding.length() > 0) {