Question

How to Convert ArrayList<> to string …

Details:

step1: send e-mail address to php mySql database
step2: if email address match database content, echoed success
step3: retrieved the php echoed value (“success”)
step4: assign the the response to a string phpEchoedVal
step5: compare phpEchoedVal with “success”
step6: write email to sd card

is this one ok
//url = email address

ArrayList nameValuePair = new ArrayList(1);

    nameValuePair.add(new BasicNameValuePair("url", url));

  try {
        //open an httpclient connection

        HttpClient httpclient = new DefaultHttpClient();

        HttpPost httppost = new HttpPost(strLink);

        httppost.setEntity(new UrlEncodedFormEntity(data));


            //response retrieve "success" echoed from server

        ResponseHandler<String> handleResponse = new BasicResponseHandler();

            //converts server response to string.

        String phpEchoVal = httpclient.execute(httppost, handleResponse);


        txtInfo.setText(phpEchoVal);

        String containEmail = txtInfo.getText().toString();



            //compare response from server with local string

            // if successful write email to sd card

        if ((containEmail.equals("success"))){

            //create a new text file

            File myFile = new File("/sdcard/moLarouteReg.txt");

            myFile.createNewFile();

            FileOutputStream fOut = new FileOutputStream(myFile);

            OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);

            myOutWriter.append(containEmail);

            //close writer
            myOutWriter.close();

        fOut.close();

        //Open menu

          Intent openMenu = new Intent("com.molaroute.mu.Menu");

            startActivity(openMenu);

            finish();

        Log.d("test","fileWritten: "+myOutWriter);

        }else {



            ...
        }
   }

Answer 1

For your first question; how to match strings in an array list(containting name value pair objects) to other strings:

    ArrayList<NameValuePair> lst = new ArrayList<NameValuePair>(); //Instantiate arraylist
    lst.add(new BasicNameValuePair("fruit", "apple")); //add entry
    lst.add(new BasicNameValuePair("animal", "monkey")); //add entry
    String strToCompareAgainst = "apple"; //str to compare to for example
    for(NameValuePair valPair : lst) { //foreach loop
        if(valPair.getValue().equals(strToCompareAgainst)) { //retrieve value of the current NameValuePair and compare
            Log.d("login","moooooo"); //success
        }
    }

You can also check if a text contains another text instead of checking for equality.

String str1 = "I am a success";
String str2 = "success";

if(str1.contains(str2)) {}  //Evaluates to true, because str1 contains the word "success"

if(str1.equals(str2)) {} //Evaluates to false, because str1 does not hold the same value as str2

Ofcourse you can do alot more, but this should give you the basic idea..

For your second question:

HttpClient.execute() returns an HttpResponse.
From HttpResponse you can call getEntity which returns an HttpEntity
From HttpEntity you can call getContent which returns an InputStream.

This InputStream you can convert to string. Example conversion code snippets are widely on the net.

so the code:

httpResponse = client.execute(post, _httpContext);
        //Set the response code from the request's responst.
        setResponseCode(httpResponse.getStatusLine().getStatusCode());
        //Retrieve the body of the response.
        entity = httpResponse.getEntity();

        if(entity != null) {
            //Retrieve the content from the body.
            _inStream = entity.getContent();
            //Convert the InputStream to String and set the String response to the returned value.
            setStringResponse(IOUtility.convertStreamToString(_inStream));
            //Close the InputStream.
            Log.d(TAG, getStringResponse());
        }   

Note that IOUtility is self written class in this case.
I think there are other ways to convert a HttpResponse to a string, but this is how I do it.

_inStream is an InputStream, entity is an HttpEntity, the rest should be self explanatory.