使用Agera，gson，okhttp获取豆瓣读书数据

使用Agera，GSON和okhttp解析数据

本文使用的是豆瓣读书的API

项目演示：

demo下载地址：AgeraDemo

实现在线查找图书的功能,整合了okhttp,gson,agera框架

API测试
URL格式:

URl：https://api.douban.com/v2/book/search?q=
返回数据

{"count":1,"start":0,"total":770,"books":[{"rating":{"max":10,"numRaters":199539,"average":"9.0","min":0},"subtitle":"","author":["[法] 圣埃克苏佩里"],"pubdate":"2003-8","tags":[{"count":48852,"name":"小王子","title":"小王子"},{"count":40834,"name":"童话","title":"童话"},{"count":19514,"name":"圣埃克苏佩里","title":"圣埃克苏佩里"},{"count":17606,"name":"法国","title":"法国"},{"count":16728,"name":"经典","title":"经典"},{"count":12965,"name":"外国文学","title":"外国文学"},{"count":9317,"name":"哲学","title":"哲学"},{"count":6809,"name":"小说","title":"小说"}],"origin_title":"Le Petit Prince","image":"https://img1.doubanio.com\/mpic\/s1237549.jpg","binding":"平装","translator":["马振聘"],"catalog":"第一卷 南渡记出版说明人物表序曲第一章 第二章第三章第四章第五章第六章第七章间曲后记第二卷 东藏记人物表……间曲后记\n","pages":"97","images":{"small":"https://img1.doubanio.com\/spic\/s1237549.jpg","large":"https://img1.doubanio.com\/lpic\/s1237549.jpg","medium":"https://img1.doubanio.com\/mpic\/s1237549.jpg"},"alt":"https:\/\/book.douban.com\/subject\/1084336\/","id":"1084336","publisher":"人民文学出版社","isbn10":"702004249X","isbn13":"9787020042494","title":"小王子","url":"https:\/\/api.douban.com\/v2\/book\/1084336","alt_title":"Le Petit Prince","author_intro":"author_intor................","summary":"sumary...........................","price":"22.00元"}]
}

布局文件

main

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context="com.example.yangtianrui.doubanapitest.MainActivity"><EditText
        android:id="@+id/id_et_key_word"android:layout_width="200dp"android:layout_height="50dp" /><Button
        android:id="@+id/id_btn_query"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="submit"android:layout_alignParentRight="true" /><ListView
        android:id="@+id/id_lv_all_items"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_below="@id/id_et_key_word" /></RelativeLayout>

每个book的布局文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"android:layout_width="match_parent"android:layout_height="match_parent"><LinearLayout
        android:layout_width="match_parent"android:orientation="vertical"android:layout_height="match_parent"><TextView
            android:id="@+id/id_tv_book_title"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="book_title"android:textSize="15sp" /><TextView
            android:layout_marginTop="20dp"android:id="@+id/id_tv_book_author"android:layout_width="match_parent"android:layout_height="wrap_content"android:textSize="9sp"/><TextView
            android:id="@+id/id_tv_book_subtitle"android:layout_width="match_parent"android:layout_height="wrap_content"android:textSize="9sp"/><TextView
            android:id="@+id/id_tv_book_publisher"android:layout_width="match_parent"android:layout_height="wrap_content"android:textSize="9sp"/></LinearLayout>
</android.support.v7.widget.CardView>

Book javaBean类

根据Json字符串抽取了几个关键属性组成Bean对象用作测试

/*** Created by yangtianrui on 16-5-29.*/
public class Book {private String title;private String alt_Title;private String[] author;private String publisher;public Book(String title, String alt_Title, String[] author, String publisher) {this.title = title;this.alt_Title = alt_Title;this.author = author;this.publisher = publisher;}public Book() {}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}public String getAlt_Title() {return alt_Title;}public void setAlt_Title(String alt_Title) {this.alt_Title = alt_Title;}public String[] getAuthor() {return author;}public void setAuthor(String[] author) {this.author = author;}public String getPublisher() {return publisher;}public void setPublisher(String publisher) {this.publisher = publisher;}@Overridepublic String toString() {return "Book{" +"title='" + title +'}';}
}

supplier的实现类,通过此类进行数据检索,Repository从此处获取数据

此处是数据获取的关键,我使用了GSON和okhttp框架来对json进行处理,将该类将返回一个Result对象

/*** Created by yangtianrui on 16-5-29.* 根据关键字,提供书籍数据*/
public class BooksSupplier implements Supplier<Result<List<Book>>> {private String key;// 用于建立连接private OkHttpClient client = new OkHttpClient();private Gson gson = new Gson();private static final String API_URL = "https://api.douban.com/v2/book/search";public void setKey(String key) {this.key = key;}public String getKey() {return key;}public BooksSupplier(String key) {this.key = key;}public BooksSupplier() {}private List<Book> getBooks() {Log.v("LOG", "getBooks");HttpUrl httpUrl = HttpUrl.parse(API_URL).newBuilder()// 设置查询参数.addQueryParameter("q", key).addQueryParameter("start", "0").addQueryParameter("count", "15").build();Request request = new Request.Builder().url(httpUrl).build();try {// 建立连接Response response = client.newCall(request).execute();// 获取返回的Json
//            Log.v("LOG",response.body().toString());JSONObject jsonObject = new JSONObject(response.body().string());JSONArray jsonArray = jsonObject.optJSONArray("books");List<Book> list = gson.fromJson(jsonArray.toString(), new TypeToken<List<Book>>() {}.getType());
//            Log.v("LOG", list.toString());return list;} catch (Exception e) {Log.v("LOG","error in getBooks()"+e.getMessage());e.printStackTrace();return null;}}// 获取数据@NonNull@Overridepublic Result<List<Book>> get() {List<Book> list = getBooks();if (list != null) {return Result.success(list);} else {return Result.failure();}}
}

MainActivity中，创建Observer，对Repository中的数据进行获取，同时更新UI

使用goTo方法指定获取数据执行的线程
使用thenGetFrom方法指定获取数据的Supplier
这里我们还使用了observe方法指定了一个searchObservable，后续我们可以使用searchObservable来发起事件调用。

在按钮的点击事件中,发起事件调用

// MainActivity中使用观察者更新数据
public class MainActivity extends AppCompatActivity implements Updatable {private ListView mLvAllBooks;private EditText mEtKey;private Button mBtnQuery;private MyAdapter mAdapter;private List<Book> mBooks = new ArrayList<>();private ExecutorService mExecutor;private BooksSupplier mSupplier;private Repository<Result<List<Book>>> mRepository;private SearchObserver mObserver;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);setupRepository();initView();}/*** 初始化Repository*/private void setupRepository() {// 单线程线程池mExecutor = Executors.newSingleThreadExecutor();mObserver = new SearchObserver();mSupplier = new BooksSupplier("Hello");mRepository = Repositories.repositoryWithInitialValue(Result.<List<Book>>absent()).observe(mObserver).onUpdatesPerLoop().goTo(mExecutor).thenGetFrom(mSupplier).compile();}private void initView() {mLvAllBooks = (ListView) findViewById(R.id.id_lv_all_items);mEtKey = (EditText) findViewById(R.id.id_et_key_word);mBtnQuery = (Button) findViewById(R.id.id_btn_query);mRepository.addUpdatable(MainActivity.this);mAdapter = new MyAdapter(this, mBooks);mLvAllBooks.setAdapter(mAdapter);mBtnQuery.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {String key = mEtKey.getText().toString();mObserver.doSearch(key);Log.v("LOG", "Activity  onClick  " + key);}});}private class SearchObserver extends BaseObservable {public void doSearch(String key) {mSupplier.setKey(key);dispatchUpdate();Log.v("LOG", "Activity  doSearch");}}// 执行查询操作,处理调用结果@Overridepublic void update() {Log.v("LOG", "Activity  update");if (mRepository.get().isPresent()) {///TODOmBooks.clear();mBooks.addAll(mRepository.get().get());mAdapter.notifyDataSetChanged();Log.v("LOG", mBooks.toString());}}
}

Adapter类

/*** Created by yangtianrui on 16-5-29.*/
public class MyAdapter extends BaseAdapter {private List<Book> mBooks;private LayoutInflater mInflater;private Context mContext;public MyAdapter(Context context, List<Book> list) {mInflater = LayoutInflater.from(context);mContext = context;mBooks = list;}@Overridepublic int getCount() {return mBooks.size();}@Overridepublic Object getItem(int position) {return mBooks.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder = null;if (convertView == null) {convertView = mInflater.inflate(R.layout.item_book, null);holder = new ViewHolder();holder.mTvTitle = (TextView) convertView.findViewById(R.id.id_tv_book_title);holder.mTvAuthor = (TextView) convertView.findViewById(R.id.id_tv_book_author);holder.mTvSubTitle = (TextView) convertView.findViewById(R.id.id_tv_book_subtitle);holder.mTvPublisher = (TextView) convertView.findViewById(R.id.id_tv_book_publisher);convertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}holder.mTvTitle.setText(mBooks.get(position).getTitle());holder.mTvSubTitle.setText(mBooks.get(position).getAlt_Title());if (mBooks.get(position).getAuthor().length != 0)holder.mTvAuthor.setText(mBooks.get(position).getAuthor()[0]);holder.mTvPublisher.setText(mBooks.get(position).getPublisher());return convertView;}static class ViewHolder {TextView mTvTitle;TextView mTvAuthor;TextView mTvSubTitle;TextView mTvPublisher;}
}

发现自己还是对观察者模式和Agera框架了解不够， 文章也许写的太过表面了，我会继续学习的:-)