[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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