android asynctask edittext

Question

我有一段代码查询我的web服务器xml解析返回的数据并在我的GUi中填充相关数据的文本域。之前我有我的oncreate函数中的这个代码工作正常。不过，我想向用户显示一个加载对话框，所以我将Web服务器和xml解析操作移到了asynctask中。现在的问题是，当我用我的解析数据填充我的GUI文本字段时，我得到了一个错误。任何人都可以看到我在做什么错

new BackgroundAsyncTask().execute(); /// called from the oncreate function 

，我的后台任务的代码如下

public class BackgroundAsyncTask extends 
AsyncTask<Void, Integer, Void> { 
int myProgress; 

@Override 
protected void onPostExecute(Void result) { 
MyDialog.dismiss(); 
} 

@Override 
protected void onPreExecute() { 
MyDialog = ProgressDialog.show(attraction_more_info.this, " " , " Loading. Please wait ... ", true); 

} 

@Override 
protected Void doInBackground(Void... params) { 

       xml query and parse stuff on here ... 


    // Populate page now 

    TextView titlefield = (TextView) findViewById(R.id.att_title); 
    TextView add1field = (TextView) findViewById(R.id.att_address1); 
    TextView add2field = (TextView) findViewById(R.id.att_address2); 
    TextView townfield = (TextView) findViewById(R.id.att_town); 
    TextView postcodefield = (TextView) findViewById(R.id.att_postcode); 
    TextView phonefield = (TextView) findViewById(R.id.att_phone); 
    WebView webview = (WebView) findViewById(R.id.webview1); 

       MY ERRORS START HERE 
    titlefield.setText(attraction_name); 
    add1field.setText(attraction_address1); 
    add2field.setText(attraction_address2); 
    townfield.setText(attraction_town); 
    postcodefield.setText(attraction_postcode); 
    phonefield.setText(attraction_phone); 
    webview.loadData(attraction_description, "text/html", null); 

return null; 
} 

@Override 
protected void onProgressUpdate(Integer... values) { 
} 

} 

任何人都可以帮我吗？

Answer 1

您无法从非UI线程更新UI元素。尝试移动所有的setText（）调用和webview.loadData（）来onPostExecute（）

你必须保存在类对象的查询结果做

Answer 2

试试这个，

add1field.post(new Runnable() { 
    public void run() {    
     add1field.setText(attraction_address1); 
    } 
});