轉載請注明原文地址:http://maosidiaoxian.iteye.com/blog/1743296或我在sinaapp上的博客:http://msdxblog.sinaapp.com/?p=716。
最近在做團隊圖書管理的一個Android端。因为需要通過手機掃描來輸入圖書信息(人工一條一條地輸入,作为技術人員太受不了了),需要使用ZXing的API掃描圖書ISBN,及使用豆瓣API來獲取圖書信息。
由於時間關系,這裏沒有使用ZXing的jar包,而是下載並安裝了它的開源項目——條碼掃描器,然後調用裏面的Activity掃描再獲取結果。
首先到市場下載Barcode Scaner(或搜索條碼掃描器),下載安裝。
下面先貼上Activity的布局代碼,因为是demo版,而且在內部使用,就沒去好好做布局設計,只是把需要的控件都寫上。
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:id="@+id/home_scan" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/button_scan" /> <TextView android:id="@+id/home_result_scan" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/home_book_info" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <Button android:id="@+id/home_upload_result" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/button_upload" /> <TextView android:id="@+id/home_result_upload" android:layout_width="wrap_content" android:layout_height="wrap_content" android:singleLine="false" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" > <Button android:id="@+id/home_borrow_book" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/borrow_book" /> <Spinner android:id="@+id/home_users" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right" /> </LinearLayout> <Button android:id="@+id/home_return_book" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/return_book" /> <Button android:id="@+id/home_user_manager" android:layout_width="wrap_content" android:text="@string/manager_user" android:layout_height="wrap_content" /> </LinearLayout>
然後在我們的項目中,寫一個Activity來調用Zxing的掃描功能,並通過它返回的結果訪問互聯網獲取信息。
下面是該Activity的代碼。這裏對於控件及事件的绑定,我使用了自己封裝的一個工具(Androidkit)來簡化這些代碼,所以你們會看到許多類似@AndroidView的注解,這個工具可以在http://code.google.com/p/cfuture-androidkit/獲取,或從https://github.com/msdx/androidkit上獲得最新代碼。
/* * @(#)HomeActivity.java Project:bookscan * Date:2012-12-3 * * Copyright (c) 2011 CFuture09, Institute of Software, * Guangdong Ocean University, Zhanjiang, GuangDong, China. * All rights reserved. * * 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 com.sinaapp.msdxblog.bookscan.activity; import org.apache.http.HttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import android.app.Activity; import android.content.Intent; import android.database.Cursor; import android.os.Bundle; import android.os.Handler; import android.view.View; import android.widget.SimpleCursorAdapter; import android.widget.Spinner; import android.widget.TextView; import com.sinaapp.msdxblog.androidkit.thread.HandlerFactory; import com.sinaapp.msdxblog.androidkit.ui.ResBindUtil; import com.sinaapp.msdxblog.androidkit.ui.UIBindUtil; import com.sinaapp.msdxblog.androidkit.ui.annotation.AndroidRes; import com.sinaapp.msdxblog.androidkit.ui.annotation.AndroidRes.ResType; import com.sinaapp.msdxblog.androidkit.ui.annotation.AndroidView; import com.sinaapp.msdxblog.androidkit.ui.annotation.OnClick; import com.sinaapp.msdxblog.bookscan.R; import com.sinaapp.msdxblog.bookscan.bean.Book; import com.sinaapp.msdxblog.bookscan.util.DB; import com.sinaapp.msdxblog.bookscan.util.XMLSax; /** * @author Geek_Soledad (66704238@51uc.com) */ public class HomeActivity extends Activity { private static final int HOME_ACTIVITY = 1990; private static final String DOUBAN_API = "http://api.douban.com/book/subject/isbn/"; @AndroidView(id = R.id.home_result_scan) private TextView mTextScan; @AndroidView(id = R.id.home_book_info) private TextView mTextBook; @AndroidView(id = R.id.home_result_upload) private TextView mTextUpload; @AndroidView(id = R.id.home_users) private Spinner mSpinnerUser; @AndroidRes(id = R.string.result_scan, type = ResType.STRING) private String mStringScan; @AndroidRes(id = R.string.result_getting, type = ResType.STRING) private String mStringGetting; @AndroidRes(id = R.string.book_info, type = ResType.STRING) private String mStringBookInfo; private Handler mGettingBook; private Book book; private DB mDb; private SimpleCursorAdapter mAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); UIBindUtil.bind(this, R.layout.activity_home); ResBindUtil.bindAllRes(this); init(); } /** * 初始化参數。 */ private final void init() { mGettingBook = HandlerFactory.getNewHandlerInOtherThread("book"); mDb = new DB(this); Cursor users = mDb.getAllUser(); startManagingCursor(users); mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_spinner_item, users, new String[] { "username" }, new int[] { android.R.id.text1 }); mAdapter .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); mSpinnerUser.setAdapter(mAdapter); } @OnClick(viewId = { R.id.home_scan, R.id.home_upload_result, R.id.home_borrow_book, R.id.home_return_book, R.id.home_user_manager }) public void onButtonClick(View v) { switch (v.getId()) { case R.id.home_scan: Intent intent = new Intent("com.google.zxing.client.android.SCAN"); this.startActivityForResult(intent, HOME_ACTIVITY); break; case R.id.home_upload_result: break; case R.id.home_borrow_book: break; case R.id.home_return_book: break; case R.id.home_user_manager: startActivity(new Intent(this, UserManagerActivity.class)); break; default: break; } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode != HOME_ACTIVITY) { super.onActivityResult(requestCode, resultCode, data); return; } if (data == null) { return; } final String isbn = data.getStringExtra("SCAN_RESULT"); mTextScan.setText(String.format(mStringScan, isbn)); if (isbn != null) { mTextBook.setText(mStringGetting); mGettingBook.post(new Runnable() { @Override public void run() { DefaultHttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(DOUBAN_API + isbn); try { HttpResponse response = client.execute(request); book = XMLSax.sax(response.getEntity().getContent()); String summary = book.getSummary(); summary = summary.substring(0, summary.length() < 60 ? summary.length() : 60) .concat("..."); String string = String.format(mStringBookInfo, book.getName(), book.getAuthor(), book.getPublisher(), book.getIsbn13(), summary); updateBookInfoView(string); } catch (Exception e) { e.printStackTrace(); } } }); } } /** * 更新圖書信息 * * @param string */ private void updateBookInfoView(final String string) { runOnUiThread(new Runnable() { @Override public void run() { mTextBook.setText(string); } }); } @Override protected void onResume() { super.onResume(); mAdapter.notifyDataSetChanged(); } @Override protected void onDestroy() { super.onDestroy(); mDb.close(); } }
裏面的功能及流程大致如下:
調用Zxinig的掃描條碼的Activity,然後返回該掃描結果,顯示掃描結果,然後調用豆瓣的API獲取圖書信息。接下來是要從我們的服務器上獲得該圖書的信息(如是否登記,有沒有人借走等),但因为服務端還沒搭建好,這一部分功能就沒去實現。
上面代碼中,調用Zxing的過程比較簡單,
Intent intent = new Intent("com.google.zxing.client.android.SCAN"); this.startActivityForResult(intent, HOME_ACTIVITY);
然後再在onActivityResult方法中對返回的結果進行處理就好了。
然後從豆瓣API中獲得的是xml格式的內容,這裏我就使用了android自帶的pull解析器。我需要獲得的圖書信息相對較少,Book的JavaBean如下:
/* * @(#)BookInfo.java Project:bookscan * Date:2012-12-3 * * Copyright (c) 2011 CFuture09, Institute of Software, * Guangdong Ocean University, Zhanjiang, GuangDong, China. * All rights reserved. * * 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 com.sinaapp.msdxblog.bookscan.bean; /** * @author Geek_Soledad (66704238@51uc.com) */ public class Book { private String isbn10;// 10位的ISBN private String isbn13;// 13位的ISBN private String name; // 書名 private String author;// 作者名 private String summary;// 簡介 private String publisher; // 出版社 private String image; // 封面圖片地址 public String getIsbn10() { return isbn10; } public void setIsbn10(String isbn10) { this.isbn10 = isbn10; } public String getIsbn13() { return isbn13; } public void setIsbn13(String isbn13) { this.isbn13 = isbn13; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAuthor() { return author; } public void setAuthor(String author) { this.author = author; } public String getSummary() { return summary; } public void setSummary(String summary) { this.summary = summary; } public String getPublisher() { return publisher; } public void setPublisher(String publisher) { this.publisher = publisher; } public String getImage() { return image; } public void setImage(String image) { this.image = image; } @Override public String toString() { return "Book [isbn10=" + isbn10 + ", isbn13=" + isbn13 + ", name=" + name + ", author=" + author + ", summary=" + summary + ", publisher=" + publisher + ", image=" + image + "]"; } }
然後解析器的代碼如下:
/* * @(#)XMLSax.java Project:bookscan * Date:2012-12-3 * * Copyright (c) 2011 CFuture09, Institute of Software, * Guangdong Ocean University, Zhanjiang, GuangDong, China. * All rights reserved. * * 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 com.sinaapp.msdxblog.bookscan.util; import java.io.IOException; import java.io.InputStream; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import com.sinaapp.msdxblog.bookscan.bean.Book; import android.util.Log; import android.util.Xml; /** * @author Geek_Soledad (66704238@51uc.com) */ public class XMLSax { public static Book sax(InputStream is) { Book book = null; XmlPullParser parser = Xml.newPullParser(); try { parser.setInput(is, "UTF-8"); int eventType = parser.getEventType(); while (eventType != XmlPullParser.END_DOCUMENT) { switch (eventType) { case XmlPullParser.START_TAG: Log.d("test", parser.getName()); if (parser.getName().equals("entry")) { book = new Book(); } else if (parser.getName().equals("link")) { if (parser.getAttributeValue(null, "rel").equals("image")) { book.setImage(parser.getAttributeValue(null, "href")); } eventType = parser.next(); } else if (parser.getName().equals("attribute")) { String attribute = parser.getAttributeValue(0); eventType = parser.next(); if (attribute.equals("title")) { book.setName(parser.getText()); } else if (attribute.equals("author")) { book.setAuthor(parser.getText()); } else if (attribute.equals("isbn10")) { book.setIsbn10(parser.getText()); } else if (attribute.equals("isbn13")) { book.setIsbn13(parser.getText()); } else if ( attribute.equals("publisher")) { book.setPublisher(parser.getText()); } } else if (parser.getName().equals("summary")) { eventType = parser.next(); book.setSummary(parser.getText()); } else if (parser.getName().equals("title")) { if (book.getName() == null) { eventType = parser.next(); book.setName(parser.getText()); } } break; case XmlPullParser.END_TAG: break; } eventType = parser.next(); } } catch (XmlPullParserException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return book; } }
然後是引用到的String資源,如下:
<resources> <string name="app_name">圖書掃描</string> <string name="bookmark_picker_name">Bookmarks</string> <string name="button_scan">圖書掃描</string> <string name="button_upload">上傳結果</string> <string name="result_scan">掃描結果为:%s</string> <string name="result_getting">正在向豆瓣請求數據</string> <string name="book_info">圖書信息:\n\t書名:%1$s\n\t作者:%2$s\n\t出版社:%3$s\n\tISBN:%4$s\n\t簡介:%5$s </string> <string name="borrow_book">借書</string> <string name="return_book">還書</string> <string name="manager_user">管理用戶</string> <string name="add">添加</string> <string name="delete">刪除</string> </resources>
最後的結果是這样子的:
From:ITEYE
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