使用Zxing及豆瓣API

 本文原创，转载请注明原文地址：http://maosidiaoxian.iteye.com/blog/1743296或我在sinaapp上的博客：http://msdxblog.sinaapp.com/?p=716。

最近在做团队图书管理的一个Android端。因为需要通过手机扫描来输入图书信息（人工一条一条地输入，作为技术人员太受不了了），需要使用ZXing的API扫描图书ISBN，及使用豆瓣API来获取图书信息。

由于时间关系，这里没有使用ZXing的jar包，而是下载并安装了它的开源项目——条码扫描器，然后调用里面的Activity扫描再获取结果。
首先到市场下载Barcode Scaner（或搜索条码扫描器），下载安装。
下面先贴上Activity的布局代码，因为是demo版，而且在内部使用，就没去好好做布局设计，只是把需要的控件都写上。

<?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>

<?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>

然后在我们的项目中，写一个Activity来调用Zxing的扫描功能，并通过它返回的结果访问互联网获取信息。

下面是该Activity的代码。这里对于控件及事件的绑定，我使用了自己封装的一个工具（Androidkit)来简化这些代码，所以你们会看到许多类似@AndroidView的注解，这个工具可以在http://code.google.com/p/cfuture-androidkit/获取，或从https://github.com/msdx/androidkit上获得最新代码。

/*
 * @(#)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 ([email protected])
 */
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();
}

/**
 * 初始化参数。
 */
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();
}
}

});
}
}

/**
 * 更新图书信息
 *
 * @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();
}
}

/*
 * @(#)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 ([email protected])
 */
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();
	}

	/**
	 * 初始化参数。
	 */
	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();
					}
				}

			});
		}
	}

	/**
	 * 更新图书信息
	 * 
	 * @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();
	}
}