Question

当我开始系统发送my：

时，我有一个问题是将List从Simple Adpater发送到布局

public class Lista extends ListActivity 
{
        HttpPost httppost;
        StringBuffer buffer;
        HttpResponse response;
        HttpClient httpclient;
        List<NameValuePair> nameValuePairs; 
        private static final String PREFERENCES_NAME = "myPreferences";
        private static final String PREFERENCES_TEXT_FIELDK = "key";

TextView result;
String text;

// XML node keys
static final String KEY_ITEM = "quote"; // parent node
static final String KEY_ID = "id";
static final String KEY_NAME = "name";
static final String KEY_COST = "date";
static final String KEY_DESC = "place";
static final String KEY_POLEC = "action";
private SharedPreferences preferences;
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(R.layout.lista);
    preferences = getSharedPreferences(PREFERENCES_NAME, Activity.MODE_PRIVATE);
    result = (TextView)findViewById(R.id.info);
    try {checksession();}catch(JSONException e){/* TODO Auto-generated catch block */ e.printStackTrace();}
}
public void checksession() throws JSONException
{ 
    // Create a new HttpClient and Post Header
    Thread thread = new Thread()
    {
        @Override
        public void run() 
        {
            try{
                httpclient=new DefaultHttpClient();
                httppost= new HttpPost(xxx); // make sure the url is correct.
                ......................
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                //Execute HTTP Post Request
                response=httpclient.execute(httppost);
                ResponseHandler<String> responseHandler = new BasicResponseHandler();
                final String response = httpclient.execute(httppost, responseHandler);
                System.out.println("Response : " + response);
                runOnUiThread(new Runnable() 
                {
                public void run() 
                {
                    // p.dismiss();
                if (response != null && response.length()==6)
                {

                    //  result.setText("In System");
                    takeXML(); // takeXML XML
                }else{ result.setText("No login:"+response);}
                }
                });
            }catch(Exception e){
                //runOnUiThread(new Runnable() {public void run() {p.dismiss();}});
                result.setText("Error system");
                System.out.println("Exception : " + e.getMessage());
            }
        }
    };
    thread.start(); 
}

在这个位置代码没问题。现在是代码函数takeXML：

    private void takeXML()
{
    new Thread(new Runnable() {
    public void run() 
    {
        try{ 
            ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();
            String adresxml="http://xxx.xml";
            XMLParser parser = new XMLParser(); 
            String xml = parser.getXmlFromUrl(adresxml); // getting XML
            Document doc = parser.getDomElement(xml); // getting DOM element
            NodeList nl = doc.getElementsByTagName(KEY_ITEM);

            for (int i = 0; i < nl.getLength(); i++) 
            {
                // creating new HashMap
                HashMap<String, String> map = new HashMap<String, String>();
                Element e = (Element) nl.item(i);
                // adding each child node to HashMap key => value
                map.put(KEY_ID, parser.getValue(e, KEY_ID));
                map.put(KEY_NAME, parser.getValue(e, KEY_NAME));
                map.put(KEY_COST, parser.getValue(e, KEY_COST));
                // adding HashList to ArrayList
                // excel[i] = new ExcelFileClass() 

                menuItems.add(map);
            }
            Log.v("List","Array:"+menuItems);
            // Adding menuItems to ListView
            ListAdapter adapter = new SimpleAdapter(getBaseContext(), menuItems,R.layout.list_item,new String[] { KEY_NAME, KEY_COST, KEY_ID }, new int[] {R.id.name,R.id.cost, R.id.elements });

现在结束是问题，在这个地方系统发送给我： “android.view.ViewRootImpl $ CalledFromWrongThreadException：只有创建视图层次结构的原始线程才能触及其视图。” 我试试，我正在寻找如何解决这个问题。但是，不知道这个。

            setListAdapter(adapter);
            ListView lv = getListView();
            lv.setOnItemClickListener(new OnItemClickListener()
            {
                @Override
                public void onItemClick(AdapterView<?> parent, View view,int position, long id) 
                {
                    ......  
                }
            });
        }catch(Exception e){
            //runOnUiThread(new Runnable() {public void run() {p.dismiss();}});
            result.setText("Error");
            System.out.println("Exception : " + e.getMessage());
        }
    }
}).start();
}

Answer 1

您需要调用代码部分来修改活动主线程内的UI。

要执行此操作，请使用runOnUiThread来呼叫setListAdapter(adapter)：

runOnUiThread(new Runnable() {
   @Override
   public void run() {
        setListAdapter(adapter)
   }
});

对result.setText("Error");执行相同操作。

修改

private void takeXML() { new Thread(new Runnable() { public void run() { try{ ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>(); String adresxml="http://xxx.xml"; XMLParser parser = new XMLParser(); String xml = parser.getXmlFromUrl(adresxml); // getting XML Document doc = parser.getDomElement(xml); // getting DOM element NodeList nl = doc.getElementsByTagName(KEY_ITEM); for (int i = 0; i < nl.getLength(); i++) { // creating new HashMap HashMap<String, String> map = new HashMap<String, String>(); Element e = (Element) nl.item(i); // adding each child node to HashMap key => value map.put(KEY_ID, parser.getValue(e, KEY_ID)); map.put(KEY_NAME, parser.getValue(e, KEY_NAME)); map.put(KEY_COST, parser.getValue(e, KEY_COST)); // adding HashList to ArrayList // excel[i] = new ExcelFileClass() menuItems.add(map); } Log.v("List","Array:"+menuItems); // Adding menuItems to ListView ListAdapter adapter = new SimpleAdapter(getBaseContext(), menuItems,R.layout.list_item,new String[] { KEY_NAME, KEY_COST, KEY_ID }, new int[] {R.id.name,R.id.cost, R.id.elements }); runOnUiThread(new Runnable() { @Override public void run() { setListAdapter(adapter) } }); ListView lv = getListView(); lv.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view,int position, long id) { ...... } }); }catch(Exception e){ //runOnUiThread(new Runnable() {public void run() {p.dismiss();}}); runOnUiThread(new Runnable() { @Override public void run() { result.setText("Error"); } }); System.out.println("Exception : " + e.getMessage()); } } }).start(); }

希望有所帮助：）

新的Thread和SimpleAdapter

1 个答案: