如何使用ProgressDialog和Async Task同时获取Method

Question

我有通用的异步任务类,它从服务器获取响应.我通过使用get方法接收这些响应.现在,当我使用get方法时,我知道UI线程是块,bcoz我的进度Dialog没有按时显示.

现在可以有人告诉我替代做这个吗？(在每种情况下,我都需要将响应发送回执行调用的活动,因此打开新活动对我没有帮助)

代码:AsyncTask类

 public class GetDataFromNetwork extends AsyncTask<Void,String,Object> {

protected void onPreExecute() {
    super.onPreExecute();
    progressDialog.show();
} 


 protected Object doInBackground(Void... params) {
    Object result = null;
    try {
        SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER10);
        new MarshalBase64().register(envelope);
        envelope.dotNet = true;
        envelope.setOutputSoapObject(request);
        AndroidHttpTransport androidHttpTransport = new AndroidHttpTransport(ipAddress + webService);
        System.setProperty("http.keepAlive", "true");
        try {
            androidHttpTransport.call(nameSpace + methodName, envelope);
        } catch (Exception e) {

            e.printStackTrace();
            publishProgress(e.getMessage());
        }
        androidHttpTransport.debug = true;
        System.out.println("response: " + androidHttpTransport.requestDump);
        result = envelope.getResponse();
        if(result!=null){
            System.out.println("GetDataFromNetwork.doInBackground() result expection---------"+result);
        }
    } catch (Exception e) {
        System.out.println("GetDataFromNetwork.doInBackground()-------- Errors");
        e.printStackTrace();

    }

    return result;
}

protected void onPostExecute(Object result) {
    super.onPostExecute(result);
    progressDialog.dismiss();
}

代码:活动

GetDataFromNetwork request = new GetDataFromNetwork(
                                        this,
                                        ProgressDialog.STYLE_SPINNER,
                                        getResources().getText(R.string.autenticate).toString());
response= (SoapObject)request.execute().get();

Answer 1

我在我的应用程序中一直在做这样的事情,我发现最简单的方法是创建"回调"接口并将其作为参数传递给我的"AsyncTask".你执行"doInBackground()"处理,当它完成时,从onPostExecute调用"Callback"实例,将"result"对象作为参数传递.

下面是它的一个非常简化的版本.

回调接口示例:

package example.app;

public interface Callback {

        void run(Object result);
}

使用上面的Callback接口的AsyncTask示例:

public class GetDataFromNetwork extends AsyncTask<Void,String,Object> {
  Callback callback;
  public GetDataFromNetwork(Callback callback){
     this.callback = callback;
  }

   protected void onPreExecute() {
      super.onPreExecute();
      progressDialog.show();
  } 


   protected Object doInBackground(Void... params) {
      Object result = null;
      // do your stuff here
      return result;
  }

  protected void onPostExecute(Object result) {
     callback.run(result);
     progressDialog.dismiss();
  }

}

如何在您的应用中使用上述类的示例:

class Example {
   public onCreate(Bundle savedInstanceState){
      //initialize

      GetDataFromNetwork request = new GetDataFromNetwork(new Callback(){
                     public void run(Object result){
                             //do something here with the result
       }});
       request.execute();      
   }
}