package com.lixu.TestJson;

 import android.app.Activity;

 import android.content.Context;

 import android.content.res.AssetManager;

 import android.os.Bundle;

 import android.view.LayoutInflater;

 import android.view.View;

 import android.view.ViewGroup;

 import android.widget.BaseAdapter;

 import android.widget.ListView;

 import android.widget.TextView;

 import android.widget.Toast;

 import org.json.JSONArray;

 import org.json.JSONException;

 import org.json.JSONObject;

 import java.io.BufferedReader;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.InputStreamReader;

 import java.util.ArrayList;

 import java.util.List;

 public class MainActivity extends Activity {

     private ListView mListView;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         // 第一步实例化控件

         mListView = (ListView) findViewById(R.id.list);

         // 第二步数据源

         List<Book> bookList = getBooks();

         MyBooksAdapter adapter = new MyBooksAdapter(this);

         // 使用适配器中的方法将数据设置进去

         adapter.setBookList(bookList);

         mListView.setAdapter(adapter);

     }

     // 第三步适配器

     public class MyBooksAdapter extends BaseAdapter {

         private List<Book> bookList = new ArrayList<Book>();

         private LayoutInflater mLayoutInflater;

         public MyBooksAdapter(Context context) {

             mLayoutInflater = LayoutInflater.from(context);

         }

         // 添加这个方法，便于外部传递数据源进来

         public void setBookList(List<Book> bookList) {

             this.bookList = bookList;

             notifyDataSetChanged();

         }

         @Override

         public int getCount() {

             return bookList.size();

         }

         @Override

         public Object getItem(int i) {

             return bookList.get(i);

         }

         @Override

         public long getItemId(int i) {

             return i;

         }

         @Override

         public View getView(int i, View view, ViewGroup viewGroup) {

             if (view == null) {

                 view = mLayoutInflater.inflate(android.R.layout.simple_list_item_1, null);

             }

             TextView textView = (TextView) view;

             Book book = (Book) getItem(i);

             textView.setText(book.getId() + "  " + book.getName());

             Toast.makeText(getApplicationContext(), book.getId() + "  " + book.getName(), 1).show();

             return view;

         }

     }

     public List<Book> getBooks() {

         // 从Asset文件中找到文件，获取json字符串

         AssetManager assetManager = this.getAssets();

         InputStream inputStream = null;

         List<Book> bookList = new ArrayList<Book>();

         try {

             inputStream = assetManager.open("myjson.json");

             String jsonStr = readInPutStream(inputStream);

             // 解析jason

             JSONObject jsonObjectRoot = null;

             jsonObjectRoot = new JSONObject(jsonStr);

             JSONArray jsonArray = jsonObjectRoot.getJSONArray("books");

             int length = jsonArray.length();

             for (int i = 0; i < length; i++) {

                 JSONObject jsonObject = jsonArray.getJSONObject(i);

                 JSONObject jsonBook = jsonObject.getJSONObject("book");

                 String bookName = jsonBook.getString("name");

                 int bookId = jsonBook.getInt("id");

                 Book book = new Book();

                 book.setId(bookId);

                 book.setName(bookName);

                 bookList.add(book);

             }

         } catch (JSONException e) {

             e.printStackTrace();

         } catch (IOException e) {

             e.printStackTrace();

         }

         return bookList;

     }

     // 从字节流中读取数据转换为String字符串

     public String readInPutStream(InputStream inputStream) {

         BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

         String line = "";

         StringBuilder stringBuilder = new StringBuilder();

         try {

             while ((line = reader.readLine()) != null) {

                 stringBuilder.append(line);

             }

         } catch (IOException e) {

             e.printStackTrace();

         } finally {

             if (reader != null) {

                 try {

                     reader.close();

                 } catch (IOException e) {

                     e.printStackTrace();

                 }

             }

         }

         return stringBuilder.toString();

     }

 }

 package com.lixu.TestJson;

 import java.io.Serializable;

 /**

  * Created by Administrator on 2015/12/31.

  */

 public class Book implements Serializable{

     private int id;

     private String name;

     public Book() {

     }

     public Book(int id, String name) {

         this.id = id;

         this.name = name;

     }

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public int getId() {

         return id;

     }

     public void setId(int id) {

         this.id = id;

     }

 }

 package com.lixu.TestJson;

 import java.util.List;

 /**

  * Created by Administrator on 2015/12/31.

  */

 public class BookInfo {

     private List<BookResult> books;

     public List<BookResult> getBooks() {

         return books;

     }

     public void setBooks(List<BookResult> books) {

         this.books = books;

     }

 }

 package com.lixu.TestJson;

 /**

  * Created by Administrator on 2015/12/31.

  */

 public class BookResult {

     private Book book;

     public Book getBook() {

         return book;

     }

     public void setBook(Book book) {

         this.book = book;

     }

 }