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SOAPリクエストをサーバーに送信するこのクラスがあります。メイン クラス、AsyncTask クラス、パーサー クラス、インターフェイスがあります。私の問題は、常にこの NullpointerException が発生することです。私がやろうとしているのは、メイン アクティビティで文字列を AsyncTask に送信し、次に AsyncTask で onPostExecute の結果を送信することです。それをパーサー クラスに渡す必要があります。この部分で問題が発生しています。前の質問のインターフェイスを使用していますが、機能していません。

AsyncTask クラス:

public class TestAsyncTask extends AsyncTask<String, Void, String> {

public TestInterface delegate = null;
String soapString = "http://-------------"; 
String serverString = "https:-----------";

@Override
protected String doInBackground(String... sString) {
String yourValue = sString[0];
String resString = null; //This will be the storage of the response.

try {

    //Uses URL and HttpURLConnection for server connection
    URL url = new URL(serverString); 
    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); 
    urlConnection.setDoOutput(true); 
    urlConnection.setDoInput(true); 
    urlConnection.setUseCaches(false); 
    urlConnection.setChunkedStreamingMode(0); 
    urlConnection.addRequestProperty("SOAPAction", soapString); 
    urlConnection.addRequestProperty("Content-Type", "text/xml; charset=utf-8"); 
    urlConnection.addRequestProperty("Content-Length", "" + yourValue.length()); 
    urlConnection.setRequestMethod(HttpPost.METHOD_NAME); 

    // Using OutputStream and Writer to send a request to the server.
    OutputStream outputStream = urlConnection.getOutputStream(); 
    Writer writer = new OutputStreamWriter(outputStream); 
    writer.write(yourValue); 
    writer.flush(); 
    writer.close(); 

    //Using InputStream to get the response of the request from the server.
    InputStream inPutStream = urlConnection.getInputStream(); 
    BufferedReader buffReader = new BufferedReader(new InputStreamReader(inPutStream)); 
    ByteArrayBuffer byteBuffer = new ByteArrayBuffer(50);

    int resint = urlConnection.getResponseCode(); 

    while ((resint = buffReader.read()) != -1) {
        byteBuffer.append(resint); 
    }

    resString = new String(byteBuffer.toByteArray()); 

    } catch (Exception aException) {
    resString = aException.getMessage(); 
    }

    return resString; 
}


protected void onPostExecute(String aReturnValueString) {
    //I THINK HERE IS WHERE THE PROBLEM EXIST
            delegate.processFinish(aReturnValueString);
}
}

インターフェース、これはよくわかりません：

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

パーサー クラス:

public class TestParser implements TestInterface {

TestAsyncTask a= new TestAsyncTask();
TextView oTextView[], aTextView[], pTextView[], dTextView[]; //Create a new TextView array to store the parsing results.
private LinearLayout linearLayout;
int pars;

Context contxt;

//Constructor
public TestParser(Context cContext){
    contxt = cContext; //Pass Context to constructor
}

//Getter for LinearLayout.
    public LinearLayout getLinearLayout(){
        return linearLayout;
    }
    //Setter for LinearLayout.
    public void setLinearLayout(LinearLayout aSetterLinearLayout){
        this.linearLayout = aSetterLinearLayout;
    }


    public void onCreate(Bundle savedInstanceState) {
     a.delegate = this;
    }

 public void processFinish(String output) {
    // TODO Auto-generated method stub
    linearLayout = new LinearLayout(this);

    //The try/catch statement encloses some code and is used to handle errors and exceptions that might occur in that code.
    try {

        //Use SAXParser(Simple API for XML) to handle the parsing of XML(Response). */

        SAXParserFactory saxParF = SAXParserFactory.newInstance(); 
        SAXParser sAXPar = saxParF.newSAXParser(); 
        XMLReader xMLReader = sAXPar.getXMLReader(); 

        // Create handler to handle XML Tags (GBXMLHandler extends DefaultHandler).         
        TestXMLHandler xMLHandler = new TestXMLHandler(); 
        xMLReader.setContentHandler(xMLHandler); 
        InputSource inputSource = new InputSource(new StringReader(output)); 
        xMLReader.parse(inputSource);

        TestData data = TestXMLHandler.aData; 

        int aone = data.getoName().size();
        int atwo = data.getDes().size();

        oTextView = new TextView[aone];  
        aTextView = new TextView[aone]; 
        dTextView = new TextView[atwo];
        pTextView = new TextView[atwo];

        //The for statement provides a compact way to iterate over a range of values.
        for (pars = 0; pars + 1 < atwo; pars++) {

        dTextView[pars] = new TextView(getApplicationContext()); 
        dTextView[pars].setText("Description = " + data.getDes().get(pars)); 
        linearLayout.addView(dTextView[pars]); 

        pTextView[pars] = new TextView(getApplicationContext()); 
        pTextView[pars].setText("RegularSellUnitPrice = " + data.getRegularSellUnitPrice().get(pars)); 
        linearLayout.addView(pTextView[pars]);
        }

        for (pars = 0; pars < aone; pars++){
        oTextView[pars] = new TextView(getApplicationContext()); 
        oTextView[pars].setText("OperatorName = " + data.getoName().get(pars)); 
        linearLayout.addView(oTextView[pars]);

        aTextView[pars] = new TextView(getApplicationContext()); 
        aTextView[pars].setText("type = " + data.getType().get(pars));
        linearLayout.addView(aTextView[pars]);      
        }
    } catch (Exception e) {
        System.out.println("XML Pasing Exception = " + e);
    }
}
}
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1 に答える 1

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あなたのdelegateオブジェクトは決してインスタンス化されていないように思えます。

あなたはそれを次のように宣言しnull、決して呼び出しませんdelegate = new TestParser()

于 2012-10-22T10:49:41.327 に答える