Android Spinner上出現多個AsyncTasks問題

Question

我收到了一些錯誤。 我知道問題是什么，但我不知道如何解決它。

我有4個旋轉器。 每個微調器都有一個asynctask。 簡而言之，當我在spinner1上選擇一個項目時，執行填充spinner2的第二個asynctask（選擇的項目添加到第二個asynctask作為參數）以這種方式繼續。

但在第一個asynctask結束之前，spinner2無法填充。 在這種情況下，我收到錯誤。 怎么解決？ 如何在第一個任務完成，第二個任務工作？

這是代碼;

第一項任務

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;
        }
    }

第二項任務

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;
        }
    }

的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) {}
            });
        }

編輯：我從我的Web服務獲取數據並填充spinner1。 我會得到數據（spinner1選擇項目）？ 我在哪里填充spinner2執行第二個任務？

Answer 1

我找到解決方案！

從Web服務獲取數據：

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AsyncTask：

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();
            }    
        }

獲取spinner1選擇的項目並啟動第二個asynctask：

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中執行第一個任務：

new ilceDoldur().execute();

Answer 2

根據我對這個問題的理解，你說你有多個AsyncTasks來控制多個Spinners的內容。 您進行了一些交互，導致Spinner1被填充並立即執行另一個應該導致Spinner2被填充的交互，但觀察到的行為是Spinner2在Spinner1完成填充之前不會填充。

這是因為AsyncTasks的默認行為是進程中的所有進程以串行方式執行。 如果希望AsyncTasks並行運行，請使用AsyncTask.executeOnExecutor（）並指定線程池執行程序。 盡管仔細閱讀AsyncTask的文檔，但默認的並行性行為隨着時間的推移而發生了變化。

Answer 3

只需更改onPostExcecute即可

    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();
        }    
    }