How send data to website by using android app

Question

I'm trying to send some data to my website. When the button is clicked, data need to be sent to the web site

but I got some errors when I am running the program

when I clicked the button this message appears "unfortunately app has stopped" then it exit my application.

 public class testInput extends Activity {

Button Setbutton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);


    setContentView(R.layout.test_input_page);

    Setbutton=(Button)findViewById(R.id.setbtn);

Setbutton.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
        testInput ti=new testInput();
            //Create the intent



           ti.postData("Sent Data");


    });

}

public void postData(String toPost) {
    // Create a new HttpClient and Post Header
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost("http://mysite.com/index.php");

    //This is the data to send
    String MyName = toPost; //any data to send

    try {
    // Add your data
    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
    nameValuePairs.add(new BasicNameValuePair("action", MyName));

    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

    // Execute HTTP Post Request

    ResponseHandler<String> responseHandler = new BasicResponseHandler();
    String response = httpclient.execute(httppost, responseHandler);

    //This is the response from a php application
    String reverseString = response;
    Toast.makeText(this, "response" + reverseString, Toast.LENGTH_LONG).show();

    } catch (ClientProtocolException e) {
    Toast.makeText(this, "CPE response " + e.toString(), Toast.LENGTH_LONG).show();
    // TODO Auto-generated catch block
    } catch (IOException e) {
    Toast.makeText(this, "IOE response " + e.toString(), Toast.LENGTH_LONG).show();
    // TODO Auto-generated catch block
    }

    }//end postData()

This is my PHP code.

<?php

//code to reverse the string

$reversed = strrev($_POST["action"]);

echo $reversed;

?>

I got permission also for use internet in my app.

Answer 1

Since Android 3.x you can't perform network operations in main thread. You need to use AsyncTask or separate thread where you can call your postData method.

http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html

Answer 2

Use the following code

HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://yoursite.com/index.php");

String MyName = toPost; 

try 
{
    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
    nameValuePairs.add(new BasicNameValuePair("action", MyName));

    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

    HttpResponse response = httpclient.execute(httppost);

    InputStream is = response.getEntity().getContent();

    BufferedReader br = new BufferedReader(new InputStreamReader(is));

    result = br.readLine();
    //This is the response from a php application
    String reverseString = result;
    Toast.makeText(this, "result" + reverseString, Toast.LENGTH_LONG).show();
}
catch(Exception e)
{
    Toast.makeText(this, ""+e, Toast.LENGTH_LONG).show();
}