Android Open Source - FoodFinderApp Async Authenticate User

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License

The source code is released under:

GNU General Public License

Java Source Code

package cs499.examples.semesterproject;
/*from   w w w  .  j a v  a  2  s.c o  m*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.Toast;

public class AsyncAuthenticateUser extends AsyncTask <String, String, JSONArray>
{
  Activity activityContext;
  List <NameValuePair> pairs;
  String url;
  ProgressDialog progressDialog;
  
  public AsyncAuthenticateUser (Activity a, List<NameValuePair> pairs, String url)
  {
    this.activityContext = a;
    this.pairs = pairs;
    this.url = url;
  }
  
  protected void onPreExecute() 
  {
      progressDialog = new ProgressDialog(activityContext);
      progressDialog.setMessage("Authenticating login info...");
        progressDialog.show();
    }
  
  
  @Override
  protected JSONArray doInBackground(String... params)   
  {
    return this.getJSONFromUrl(this.url);
  }
  
  private JSONArray getJSONFromUrl(String url)  // url is your json url
  {

      // Making HTTP request
    InputStream is = null; 
    String json = null;
    JSONArray jObj = null;
      try {
          // defaultHttpClient
          DefaultHttpClient httpClient = new DefaultHttpClient();
          HttpPost post = new HttpPost(url);
          post.setEntity(new UrlEncodedFormEntity(pairs));
          HttpResponse httpResponse = httpClient.execute(post);
          HttpEntity httpEntity = httpResponse.getEntity();
          is = httpEntity.getContent();           

      } catch (UnsupportedEncodingException e) {
          e.printStackTrace();
      } catch (ClientProtocolException e) {
          e.printStackTrace();
      } catch (IOException e) {
          e.printStackTrace();
      }

      try {
          BufferedReader br = new BufferedReader(new InputStreamReader(is));
          StringBuilder sb = new StringBuilder();
          int value=0;
          int count = 0;
           
           // reads to the end of the stream 
          value = br.read();
           while( value != -1)
           {
              // converts int to character
              char c = (char)value;
              sb.append(c);
              count++;
              //System.out.println(c);
              value = br.read();
           }
          is.close();
          String s = sb.toString();
          System.out.println("Characters read: "+count+", Length of S: "+s.length());
          json = s;
          System.out.println("getJSONfromURL: "+ json);
      } catch (Exception e) {
          Log.e("Buffer Error", "Error converting result " + e.toString());
      }
      

      // try parse the string to a JSON object
      try {
          jObj = new JSONArray(json);
      } catch (JSONException e) {
          Log.e("JSON Parser", "Error parsing data " + e.toString());
      }

      // return JSON String
      return jObj;
  }
  
  protected void onPostExecute (JSONArray jobj)
    {
     if (this.progressDialog.isShowing())
       this.progressDialog.dismiss();
     this.checkUser (jobj);
    }
  
  public void checkUser (JSONArray j)
  {
    String inputName = this.pairs.get(0).getValue();
    String inputPassword = this.pairs.get(1).getValue();
    boolean inDb;
    try
    {
        if (j == null || j.length() == 0)
        { 
          String error = "Username does not exist. Try again, or register first";
          Toast.makeText(this.activityContext, error, Toast.LENGTH_SHORT).show();
          System.out.println("JSON Array is null");
          return;
        }
        JSONObject o = (JSONObject) j.getJSONObject(0);
        String userName = o.getString("username");
        String userPassword = o.getString("password");
        String userType = o.getString("usertype");
        
        Log.d("Username: ", userName);
        Log.d("Password: ", userPassword);
        Log.d("userType: ", userType);
        if (inputPassword.equals(userPassword))
          inDb = true;
        else
          inDb = false;
        
        Log.d("User in DB: ", "" + inDb);
        
        if (inDb)
        {
          if (userType.equals("owner"))
          {
            Intent i = new Intent (this.activityContext, FoodOwnerOptions.class);
            i.putExtra("username", userName);
            this.activityContext.startActivity(i);
          }
          else if (userType.equals("organization"))
          {
            Intent i = new Intent (this.activityContext, OrganizationOptions.class);
            i.putExtra("username", userName);
            this.activityContext.startActivity(i);
          }
        }
        else
        {
          Toast.makeText(this.activityContext, "Incorrect Password. Try again", Toast.LENGTH_SHORT).show();
        }
      
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
  }
   
}

Java Source Code List

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