4

我遇到了一些错误。我知道问题出在哪里，但我不知道如何解决。

我有 4 个微调器。每个微调器都关联一个异步任务。简而言之，当我在 spinner1 上选择一个项目时，执行填充 spinner2 的第二个 asynctask（所选项目作为参数添加到第二个 asynctask）以这种方式继续。

但是在第一个异步任务结束之前，spinner2 无法填充。在这种情况下，我遇到了错误。如何解决？如何让第一个任务完成，第二个任务工作？

这是代码；

第一项任务

public class ilceDoldur extends AsyncTask<String[],String[],String[]>{

        @Override
        protected String[] doInBackground(String[]... params) {
            SoapObject request = new SoapObject(NAMESPACE, "ILCEGetir");
            SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
            envelope.dotNet = true;     
            envelope.setOutputSoapObject(request);
            HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
            androidHttpTransport.debug = true;

           try {

           androidHttpTransport.call("http://tempuri.org/ILCEGetir", envelope);
           SoapObject response = (SoapObject) envelope.getResponse();
           ilceList = new String[response.getPropertyCount()];

          for(int i=0;i<response.getPropertyCount();i++){          
                   ilceList[i] = response.getPropertyAsString(i).toString().trim();    
          }      
    } 
            catch (Exception e) {           
                e.printStackTrace();
           }    
            return ilceList;
        }

        protected void onPostExecute(String[] ilceList){
            ilceSpinner = (Spinner) findViewById(R.id.spinner1);
            ArrayAdapter<String> ilce_adapter = new ArrayAdapter<String>(NormalAnasayfa.this,android.R.layout.simple_spinner_item, ilceList);
            ilce_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            ilceSpinner.setAdapter(ilce_adapter);
            kontrol=true;
        }
    }

第二个任务

public class semtDoldur extends AsyncTask<String,String[],String[]>{

        @Override
        protected String[] doInBackground(String... ParamIlce) {
            PropertyInfo ilce = new PropertyInfo();
            ilce.name= "ilce";
            ilce.setValue(ParamIlce);
            ilce.type = PropertyInfo.STRING_CLASS;

            SoapObject request = new SoapObject(NAMESPACE, "SEMTGetir");
            request.addProperty(ilce);

            SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
            envelope.bodyOut=request;
            envelope.dotNet = true; 
            envelope.setOutputSoapObject(request);

            HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
            androidHttpTransport.debug = true;

           try {

           androidHttpTransport.call("http://tempuri.org/SEMTGetir", envelope);
           SoapObject response = (SoapObject) envelope.getResponse();
           semtList = new String[response.getPropertyCount()];

          for(int i=0;i<response.getPropertyCount();i++){          
                   semtList[i] = response.getPropertyAsString(i).toString().trim();    
          }      
    } 
            catch (Exception e) {           
                e.printStackTrace();
           }
            return semtList;
        }

        protected void onPostExecute(String[] semtList){
            semtSpinner = (Spinner) findViewById(R.id.spinner2);
            ArrayAdapter<String> semt_adapter = new ArrayAdapter<String>(NormalAnasayfa.this, android.R.layout.simple_spinner_item, semtList);
            semt_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            semtSpinner.setAdapter(semt_adapter);
            kontrol=true;
        }
    }

onCreate()

new ilceDoldur().execute();

        if(kontrol==true){
            kontrol=false;
            ilceSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

                public void onItemSelected(AdapterView<?> arg0, View arg1,
                        int arg2, long arg3) {
                    secilenIlce = ilceSpinner.getSelectedItem().toString().trim();
                    new semtDoldur().execute(secilenIlce);
                }
                public void onNothingSelected(AdapterView<?> arg0) {}
            });
        }

编辑：我从我的网络服务获取数据并填充 spinner1。我将在哪里获得数据（spinner1 所选项目）？我在哪里填充 spinner2 执行第二个任务？

4

3 回答 3

0

只需更改 onPostExecute

    protected void onPostExecute(String[] ilceList){
        ilceSpinner = (Spinner) findViewById(R.id.spinner1);
        ArrayAdapter<String> ilce_adapter = new ArrayAdapter<String>(NormalAnasayfa.this,android.R.layout.simple_spinner_item, ilceList);
        ilce_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        ilceSpinner.setAdapter(ilce_adapter);
        ilceSecildi();
        }    
    }

至

    protected void onPostExecute(String[] ilceList){
        ilceSpinner = (Spinner) findViewById(R.id.spinner1);
        ArrayAdapter<String> ilce_adapter = new ArrayAdapter<String>(getApplicationContext(),android.R.layout.simple_spinner_item, ilceList);
        ilce_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        ilceSpinner.setAdapter(ilce_adapter);
        ilceSecildi();
        }    
    }
于 2013-05-06T10:31:03.070 回答
0

我找到解决方案！

从网络服务获取数据：

private void ilceDoldur(){
        SoapObject request = new SoapObject(NAMESPACE, "ILCEGetir");
        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
        envelope.dotNet = true;     
        envelope.setOutputSoapObject(request);
        HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
        androidHttpTransport.debug = true;

       try {

       androidHttpTransport.call("http://tempuri.org/ILCEGetir", envelope);
       SoapObject response = (SoapObject) envelope.getResponse();
       ilceList = new String[response.getPropertyCount()];

      for(int i=0;i<response.getPropertyCount();i++){          
               ilceList[i] = response.getPropertyAsString(i).toString().trim();    
      }      
} 
        catch (Exception e) {           
            e.printStackTrace();
       }    
    }

我的异步任务：

public class ilceDoldur extends AsyncTask<String,String[],String[]>{

        @Override
        protected String[] doInBackground(String... params) {
            ilceDoldur();
            return ilceList;
        }

        protected void onPostExecute(String[] ilceList){
            ilceSpinner = (Spinner) findViewById(R.id.spinner1);
            ArrayAdapter<String> ilce_adapter = new ArrayAdapter<String>(NormalAnasayfa.this,android.R.layout.simple_spinner_item, ilceList);
            ilce_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            ilceSpinner.setAdapter(ilce_adapter);
            ilceSecildi();
            }    
        }

获取 spinner1 选定的项目并启动第二个异步任务：

public String ilceSecildi(){
        ilceSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) {
                secilenIlce = ilceSpinner.getSelectedItem().toString().trim();
                new semtDoldurAsync(secilenIlce).execute();
            }
            public void onNothingSelected(AdapterView<?> arg0) {}
        });
        return secilenIlce;
    }

在 onCreate 中执行第一个任务：

new ilceDoldur().execute();
于 2012-08-09T13:56:39.687 回答
0

根据我对问题的理解，您说您有多个 AsyncTasks 来控制多个 Spinner 的内容。您执行了一些导致 Spinner1 被填充的交互，并立即执行另一个应该导致 Spinner2 被填充的交互，但观察到的行为是 Spinner2 在 Spinner1 完成填充之前不会填充。

这是因为 AsyncTasks 的默认行为是让它们在一个进程中串行执行。如果您希望 AsyncTasks 并行运行，请使用 AsyncTask.executeOnExecutor() 并指定线程池执行程序。不过，请仔细阅读 AsyncTask 的文档，默认的并行行为已经随着时间而改变。

于 2012-08-10T21:42:23.660 回答