[Android学习系列16]Android把php输出的json加载到listview

首先写个php脚本输出json，注意，还要输出回车，方便android的bufferreader读取一行

<?php

class Book {

        public $bookid;

        public $bookname;

        public $bookinfo;
function __construct($id,$name,$info ){

            $this->bookid = $id;

            $this->bookname = $name;

            $this->bookinfo = $info;

        }

    }
$book1 = new Book("1","高等数学","一本好书");

    $book2 = new Book("2","呵呵呵呵","一本好书");

    $book3 = new Book("3","哈哈哈哈","一本好书");
//把对象转成json 输出

    echo json_encode($book1);

    echo "\r\n";

    echo json_encode($book2);

    echo "\r\n";

    echo json_encode($book3);

    echo "\r\n";
?>

然后在android的客户端，用子线程发送http请求获取数据，然后发消息给主线程的handler更新listview

listview的一行的样式  one_item.xml  :

<?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" >

<TextView

        android:id="@+id/textview"

        android:gravity="center"

        android:textColor="#000000"

        android:layout_width="fill_parent"

        android:layout_height="30dp"/>
</LinearLayout>

activity的java代码:

//搞了我半天，整个流程应该是这样的

//因为http获取json的数据 写到一个新线程里  new thread ( runnableUi )

//在新线程runnableUi里，有一个initDataAndAdapter() 用来获得网络数据 放进listbook，获取完后发消息给 主线程的handler

//handler收到消息后， 把数据源listbook 传给  listview 的adapter (即更新主线程界面)

public class MainActivity extends Activity {
List<Book> listBook;

    ListView listView;
// 构建Runnable对象，在runnable中更新界面

    Runnable runnableUi = new Runnable(){

        @Override

        public void run() {
initDataAndAdapter();

        }
};
//主线程的handler，  http请求获得数据后 会调用这个主线程的handler  来修改主线程界面(绑定listview的adapter)

    Handler handler = new Handler(){
public void handleMessage(Message msg) {
//在主线程的handler里    修改listview的适配器

            listView.setAdapter(new MyListAdapter(getApplicationContext(), listBook ));
};
};
@Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);
listView = (ListView)findViewById(R.id.listView1);

        listBook = new ArrayList<Book>();
new Thread( runnableUi ).start();
}
@Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }
public void initDataAndAdapter() {
HttpClient httpClient = new DefaultHttpClient();

        HttpGet httpGet = new HttpGet("http://taobibi.kuphp.net/");

        Book book;
try {
HttpResponse httpResponse = httpClient.execute(httpGet);

            BufferedReader bufferReader = new BufferedReader( new InputStreamReader( httpResponse.getEntity().getContent() ) );
for(String s = bufferReader.readLine(); s != null; s = bufferReader.readLine())

            {

                //每行为一个json对象

                JSONObject jsonObject = new JSONObject( s );

                Log.v("mytag", s);
//然后放进book对象

                book = new Book();

                book.bookId = jsonObject.getString("bookid");

                book.bookName = jsonObject.getString("bookname");

                book.bookInfo = jsonObject.getString("bookinfo");
//然后把book放进list

                listBook.add(book);
}
} catch (ClientProtocolException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (JSONException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }
//数据全都接收到listView以后，发消息给主线程里面的handler，让他去修改listview 的  setadapter

        handler.sendEmptyMessage(0);
}
class Book {

        String bookId;

        String bookName;

        String bookInfo;

    }
class MyListAdapter extends BaseAdapter {
Context context;

        List<Book> listBook;
MyListAdapter(Context con , List<Book> list ) {

            this.context = con;

            listBook = (ArrayList<Book>)list;
}
@Override

        public int getCount() {

            return listBook.size();

        }
@Override

        public Object getItem(int arg0) {

            return arg0;

        }
@Override

        public long getItemId(int arg0) {

            return arg0;

        }
@Override

        public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflator = LayoutInflater.from(context);

            View oneView = inflator.inflate(R.layout.one_item, null);

            TextView textView = (TextView)oneView.findViewById(R.id.textview);
String str = listBook.get(position).bookId  + " " + listBook.get(position).bookName + " " +  listBook.get(position).bookInfo;

            textView.setText( str );
return oneView;

        }
}
}

参考:

解决NetworkOnMainThreadException

http://www.aitinan.com/4387.html

Android访问php取回json数据

http://www.oschina.net/code/snippet_12_1122

http://blog.csdn.net/djx123456/article/details/6325983

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