如何使用 AsyncTask 在同一个 class 中处理对 Web 服务的不同方法调用？

Question

我正在开发一个 Android 应用程序，它应该连接到网络服务并将数据保存到应用程序的本地数据库中。我正在使用 AsyncTask 从我的 "Login" class 连接到所述 Web 服务，然后 returns "Login." 中的 processFinish 方法的结果问题是我需要分离数据我在 web 服务中引入了几种方法，据我所知，结果总是由 processFinish 处理。这是一个问题，因为我需要根据调用的方法以不同方式处理数据。

有没有办法告诉 processFinish 我调用了我的网络服务中的哪个方法，以便它可以不同地处理结果？我考虑过将 Web 服务本身的方法名称作为结果的一部分发送，但感觉很勉强，我希望以更简洁的方式执行此操作。

这是我使用的代码：

LoginActivity.java（缩写）：

public class LoginActivity extends ActionBarActivity implements AsyncResponse {

    public static DBProvider oDB;
    public JSONObject jsonObj;

    public JSONObject jsonUser;

    WebService webService;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        oDB = new DBProvider(this);
    }
    /*Function that validates user and password (on button press).*/
    public void validateLogin(View view){

        ConnectivityManager cm = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();

        if (!isConnected){
            Toast.makeText(this, "No connection!", Toast.LENGTH_LONG).show();
        }else{

            /* params contains the method's name and parameters I send to the web service. */
            String[][][] params = {
                {
                    {"MyWebServiceMethod"}
                },
                {
                    {"user", "myUserName", "string"},
                    {"pass", "myPass", "string"}
                }
            };

            try{
                webService = new WebService();
                webService.delegate = this;
                webService.execute(params);
            }catch(Exception ex){
                Toast.makeText(this, "Error!: " + ex.getMessage(), Toast.LENGTH_LONG).show();
            }
        }

    }

    public void processFinish(String result){
        try{
            // Here I handle the data in "result"

            }
        }catch(JSONException ex){
            Toast.makeText(this, "JSONException: " + ex.getMessage(), Toast.LENGTH_LONG).show();
        }
    }

}

WebService.java:

public class WebService extends AsyncTask<String[][][], Void, String> {

    /**
     * Variable Declaration................
     * 
     */
    public AsyncResponse delegate = null;
    String namespace = "http://example.net/";
    private String url = "http://example.net/WS/MyWebService.asmx";

    public String result;

    String SOAP_ACTION;
    SoapObject request = null, objMessages = null;
    SoapSerializationEnvelope envelope;
    HttpTransportSE HttpTransport;

    /**
     * Set Envelope
     */
    protected void SetEnvelope() {

        try {
            // Creating SOAP envelope
            envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);

            //You can comment that line if your web service is not .NET one.
            envelope.dotNet = true;

            envelope.setOutputSoapObject(request);
            HttpTransport = new HttpTransportSE(url);
            HttpTransport.debug = true;

        } catch (Exception e) {
            System.out.println("Soap Exception---->>>" + e.toString()); 
        }
    }

    @Override
    protected String doInBackground(String[][][]... params) {
        // TODO Auto-generated method stub
        try {
            String[][][] data = params[0];

            final String methodName = data[0][0][0];
            final String[][] arguments = data[1];

            SOAP_ACTION = namespace + methodName;

            //Adding values to request object
            request = new SoapObject(namespace, methodName);

            PropertyInfo property;

            for(int i=0; i<arguments.length; i++){
                property = new PropertyInfo();
                property.setName(arguments[i][0]);
                property.setValue(arguments[i][1]);

                if(arguments[i][2].equals("int")){
                    property.setType(int.class);
                }
                if(arguments[i][2].equals("string")){
                    property.setType(String.class);
                }
                request.addProperty(property);
            }

            SetEnvelope();

            try {
                //SOAP calling webservice
                HttpTransport.call(SOAP_ACTION, envelope);

                //Got Webservice response
                result = envelope.getResponse().toString();

            } catch (Exception e) {
                // TODO: handle exception
                result = "Catch1: " + e.toString() + ": " + e.getMessage();
            }
        } catch (Exception e) {
            // TODO: handle exception
            result = "Catch2: " + e.toString();
        }

        return result;
    }

    @Override
    protected void onPostExecute(String result) {
        delegate.processFinish(result);
    }
    /************************************/
}

AsyncResponse.java:

public interface AsyncResponse {
    void processFinish(String output);
}

Answer 1

您可以使用不同的 AsyncResponse 类。匿名类让这更方便：

// in one place
webService.delegate = new AsyncResponse() {
    @Override
    void processFinish(String response) {
        // do something
    }
};

// in another place
webService.delegate = new AsyncResponse() {
    @Override
    void processFinish(String response) {
        // do something else
    }
};

如何使用 AsyncTask 在同一个 class 中处理对 Web 服务的不同方法调用？

How to handle different method calls to web service in the same class using AsyncTask?

java

android

web-services

android-asynctask