Android: How to programatically login to website and retrieve data from it?

Question

Ok, guys, so I\'m recently developing android app that saves user\'s ID and PASSWORD to SharedPreferences. Now, when the user starts app second time, he will be redirected d

Answer 1

if you want to login with the you application in java or in android then you need to try with HTTPPOST

example code:

public class HttpPostExample extends Activity {

      TextView content;
      EditText fname, email, login, pass;
      String Name, Email, Login, Pass;

      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_http_post_example);

          content    =   (TextView)findViewById( R.id.content );
          fname      =   (EditText)findViewById(R.id.name);
          email      =   (EditText)findViewById(R.id.email);
          login      =    (EditText)findViewById(R.id.loginname);
          pass       =   (EditText)findViewById(R.id.password);


          Button saveme=(Button)findViewById(R.id.save);

          saveme.setOnClickListener(new Button.OnClickListener(){

              public void onClick(View v)
              {
                  try{

                           // CALL GetText method to make post method call
                          GetText();
                   }
                  catch(Exception ex)
                   {
                      content.setText(" url exeption! " );
                   }
              }
          }); 
      }

  // Create GetText Metod
public  void  GetText()  throws  UnsupportedEncodingException
      {
          // Get user defined values
          Name = fname.getText().toString();
          Email   = email.getText().toString();
          Login   = login.getText().toString();
          Pass   = pass.getText().toString();

           // Create data variable for sent values to server 

            String data = URLEncoder.encode("name", "UTF-8")
                         + "=" + URLEncoder.encode(Name, "UTF-8");

            data += "&" + URLEncoder.encode("email", "UTF-8") + "="
                        + URLEncoder.encode(Email, "UTF-8");

            data += "&" + URLEncoder.encode("user", "UTF-8")
                        + "=" + URLEncoder.encode(Login, "UTF-8");

            data += "&" + URLEncoder.encode("pass", "UTF-8")
                        + "=" + URLEncoder.encode(Pass, "UTF-8");

            String text = "";
            BufferedReader reader=null;

            // Send data
          try
          {

              // Defined URL  where to send data
              URL url = new URL("http://androidexample.com/media/webservice/httppost.php");

           // Send POST data request

            URLConnection conn = url.openConnection();
            conn.setDoOutput(true);
            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
            wr.write( data );
            wr.flush();

            // Get the server response

          reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
          StringBuilder sb = new StringBuilder();
          String line = null;

          // Read Server Response
          while((line = reader.readLine()) != null)
              {
                     // Append server response in string
                     sb.append(line + "\n");
              }


              text = sb.toString();
          }
          catch(Exception ex)
          {

          }
          finally
          {
              try
              {

                  reader.close();
              }

              catch(Exception ex) {}
          }

          // Show response on activity
          content.setText( text  );

      }

  }

i am getting this source from this url in this url you get all thing related your query.

or If you want to connect to the *FTP Login * then you can follow bellow code

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.SocketException;

import org.apache.commons.io.IOUtils;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;

public class Ftpdemo {  


     public static void main(String args[]) {  

      // get an ftpClient object  
      FTPClient ftpClient = new FTPClient();  
      ftpClient.setConnectTimeout(300);
      FileInputStream inputStream = null;  

      try {  
       // pass directory path on server to connect  
       ftpClient.connect("ftp.mydomain.in");  

       // pass username and password, returned true if authentication is  
       // successful  
       boolean login = ftpClient.login("myusername", "mypassword");  

       if (login) {  
        System.out.println("Connection established...");  
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

        ftpClient.enterLocalPassiveMode();

        inputStream = new FileInputStream("/home/simmant/Desktop/mypic.png");  

        boolean uploaded = ftpClient.storeFile("user_screens/test3.png",inputStream);



              if (uploaded) {  
         System.out.println("File uploaded successfully !");  
        } else {  
         System.out.println("Error in uploading file !");  
        }  

        // logout the user, returned true if logout successfully  
        boolean logout = ftpClient.logout();  
        if (logout) {  
         System.out.println("Connection close...");  
        }  
       } else {  
        System.out.println("Connection fail...");  
       }  

      } catch (SocketException e) {  
       e.printStackTrace();  
      } catch (IOException e) {  
       e.printStackTrace();  
      } finally {  
       try {  
        ftpClient.disconnect();  
       } catch (IOException e) {  
        e.printStackTrace();  
       }  
      }  
     }


    }