Question

我正在制作一个Android应用程序，我希望在其中填充一个带有字符串值数组的微调器，来自SQLServer 2008.我遇到了一个问题，即它表示不能从不同的线程填充微调器主线程。

       Thread waitth = new Thread() {
         public void run() {
             try {
                    System.out.println("3");

                 String details="mani";
                        System.out.println("4");
                        URLConnection con = getServletConnection();
                        System.out.println("5");
                        ObjectOutputStream oos = new ObjectOutputStream(con.getOutputStream());
                        System.out.println("7");
                        oos.writeObject(details);
                        System.out.println("8");
                        oos.flush();
                        oos.close();
                        // receive result from servlet
                        InputStream inputStream = con.getInputStream();
                        ObjectInputStream inputFromServlet = new ObjectInputStream(
                                inputStream);
                        result = (String[]) inputFromServlet.readObject();
                        //System.out.println(result);
                        inputFromServlet.close();
                        inputStream.close();
                        System.out.println();
                        System.out.println("got it");

                    System.out.println("450200");


                    ArrayList<String> aus=new ArrayList<String>();
                    for(int i=0;i<result.length;i++)
                    aus.add(result[i]);
                 ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, aus);
                    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                   s1=(Spinner)findViewById(R.id.spinner1);

                        s1.setAdapter(adapter);




             }  
            catch (Exception ex) {
              ex.printStackTrace();
            }
         }
            };
            waitth.start();


    }


    private URLConnection getServletConnection() throws MalformedURLException,
       IOException {
    URL urlServlet = new URL("http://ipaddress/spinnerfordata");//servlet
    URLConnection con = urlServlet.openConnection();
    con.setUseCaches (false); 
       con.setDefaultUseCaches(false);
    con.setDoInput(true);
    con.setDoOutput(true);
    con.setUseCaches(false);
    con.setRequestProperty("Content-Type","application/x-java-serialized-object");
    System.out.println("9");
    return con;

  }

Logcat错误：

      08-02 18:49:08.439: W/System.err(918):                      android.view.ViewRootImpl$CalledFromWrongThreadException  : Only the original thread that created a view hierarchy can touch its views.
08-02 18:49:08.454: W/System.err(918):  at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:4746)
08-02 18:49:08.454: W/System.err(918):  at android.view.ViewRootImpl.focusableViewAvailable(ViewRootImpl.java:2588)
08-02 18:49:08.454: W/System.err(918):  at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:608)
08-02 18:49:08.454: W/System.err(918):  at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:608)
08-02 18:49:08.454: W/System.err(918):  at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:608)
08-02 18:49:08.454: W/System.err(918):  at android.view.ViewGroup.focusableViewAvailable(ViewGroup.java:608)
08-02 18:49:08.454: W/System.err(918):  at android.view.View.setFlags(View.java:8412)
08-02 18:49:08.464: W/System.err(918):  at android.view.View.setFocusable(View.java:5769)
08-02 18:49:08.464: W/System.err(918):  at android.widget.AdapterView.checkFocus(AdapterView.java:718)
08-02 18:49:08.464: W/System.err(918):  at android.widget.AbsSpinner.setAdapter(AbsSpinner.java:115)
08-02 18:49:08.464: W/System.err(918):  at android.widget.Spinner.setAdapter(Spinner.java:380)
08-02 18:49:08.464: W/System.err(918):  at com.example.manispinner.MainActivity$1.run(MainActivity.java:73)

Answer 1

您正在尝试从非UI线程更新UI，但您无法按错误说明那样做。任何与UI相关的事情都需要在UI线程上完成

Answer 2

使用来自服务器的API获取数据xml或json
解析数据。
将其存储在数组中。
```
Do all the above in AsyncTask.
```
最后将其填充到微调器中。

在GitHub Spinner-Dynamic

如何使用来自sql server 2008的动态数据填充微调器

2 个答案: