Android Open Source - AndroidLookup Main Activity

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Back to project page AndroidLookup.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.jburto2.androidlookup;
//ww  w.j  a  va 2  s. co m

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;

/**
 * 
 * @author jburton
 *
 * @class MainActivity
 * 
 * @brief This class implements functionality for the main activity in Android Lookup. Start here.
 */

public class MainActivity extends Activity {
  
  /**
   * @var public final static String IP_ADDRESSES
   * @brief Stores the ip_addresses returned from LookupAddressTask
   */
  public final static String IP_ADDRESSES = "com.jburto2.androidlookup.IP_ADDRESSES";
  /**
   * @var public final static String CNAME
   * @brief Stores the CNAME returned from LookupCNAMETask
   */
  public final static String CNAME = "com.jburto2.androidlookup.CNAME";
  /**
   * @var public final static String LOOKUP_NAME
   * @brief Stores the hostname that the user enters on the main screen.
   */
  public final static String LOOKUP_NAME = "com.jburto2.androidlookup.LOOKUP_NAME";
  /**
   * @var public final static String PING_RESULTS
   * @brief Stores "Yes" or "No" result from LookupPingTask
   */
  public final static String PING_RESULTS = "com.jburto2.androidlookup.PING_RESULTS";
  /**
   * @var public final static String WHOIS_INFO
   * @brief Stores the whois request returned from WHOIS_INFO
   */
  public final static String WHOIS_INFO = "com.jburto2.androidlookup.WHOIS_INFO";

  
  @Override

  /**
   * @fn protected void onCreate(Bundle savedInstanceState)
   * @brief Method called when activity is created. Sets the content view to activity_main. 
   * 
   * @param savedInstanceState
   */
  
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
  }

  @Override
  
  /**
   *
   * @fn public boolean onCreateOptionsMenu(Menu menu)
   * @brief Inflate the menu; this adds items to the action bar if it is present.
   * @param menu Meny to be created.
   * @return true
   */
  
  public boolean onCreateOptionsMenu(Menu menu) {
    
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }
  
  @Override
  /**
   * @fn public boolean onOptionsItemSelected(MenuItem item)
   * @brief Handles menu item selection. 
   * Only menu item here is the "action_about" for the info activity.
   * @param item MenuItem that was selected
   * @return true  
   */
  public boolean onOptionsItemSelected(MenuItem item) {
  
    /// Menu from http://developer.android.com/guide/topics/ui/menus.html#options-menu
      switch (item.getItemId()) {
     
      case R.id.action_about:
        Intent intent = new Intent(this, DisplayInfoActivity.class);
        startActivity(intent);

      }
      return true;
  }

  
  /**
   * @fn void clearHostNameMessage(View view)
   * @brief Clear the fields. This should be the registered response to the "clear" button for the Hostname button.
   * Learned how to clear a field from http://stackoverflow.com/questions/8758635/how-to-clear-the-edittext-when-onclick-on-button
   * @param view
   */
  public void clearHostNameMessage(View view) {
    EditText urlText = (EditText) findViewById(R.id.editHostName);
    urlText.setText("");
    
    
    }

  /**
   * @fn public void lookupMessage(View view)
   * @brief Looks up the url or the IP address. This should be the registered response to the "lookup" button.
   * Note: The actual lookup is done on a separate thread.
   * @param view
   */
  
    public void lookupMessage(View view) 
    {
        // EditText object for url
      EditText urlText = (EditText) findViewById(R.id.editHostName);
      
      // pointer to lookupString
      String lookupString = null;
      
      //Results from tasks
      String ipAddressesArray = null;
      String cNameString = null;
      String pingString = null;
      
      /// About progress bars: http://stackoverflow.com/questions/11099012/android-spin-refresh-button-while-reloading
      ProgressBar pb = (ProgressBar) findViewById(R.id.progressBar1);
      
       
      if (urlText.getText().toString().equals(""))
          {
          //both are empty, display message        
          displayMessageDialog("Please enter either a hostname or IP address to lookup.","No Value");
            return;
          }
      else
        {
        // ip text is empty. Look up name.
        lookupString = urlText.getText().toString();
        //resultText = ipText;
        }
      pb.setVisibility(View.VISIBLE);
      LookupAddressTask lookupAddressTask = new LookupAddressTask();
      ipAddressesArray = runLookupTask(lookupAddressTask,lookupString);
      // if we can't find any ipAddresses, return now.
      if (ipAddressesArray == null)
      {
        pb.setVisibility(View.GONE);
        return;
      }
      
      
      LookupCNAMETask lookupCNAMETask = new LookupCNAMETask();
      cNameString = runLookupTask(lookupCNAMETask,lookupString);

      // if we can't find any ipAddresses, return now.
      if (cNameString == null)
      {
        pb.setVisibility(View.GONE);
        return;
      }

      LookupPingTask lookupPingTask = new LookupPingTask();
      pingString = runLookupTask(lookupPingTask,lookupString);
      
      Intent intent = new Intent(this, DisplayLookupActivity.class);
      
      
      //EditText editText = (EditText) findViewById(R.id.edit_message);
      intent.putExtra(IP_ADDRESSES, ipAddressesArray );
      intent.putExtra(CNAME, cNameString );
      intent.putExtra(LOOKUP_NAME, lookupString);
      intent.putExtra(PING_RESULTS, pingString);
      pb.setVisibility(View.GONE);
      startActivity(intent);
      
    }  
  /**
   * @fn public void whoisMessage(View view)
   * @brief Gets the whois information for the host. This should be the registered response to the "whois" button.
   * Note: The actual lookup is done on a separate thread.
   * @param view
   */
  
    public void whoisMessage(View view) 
    {
        // EditText object for url
      EditText urlText = (EditText) findViewById(R.id.editHostName);
      
      // pointer to lookupString
      String lookupString = null;
      
      //Results from tasks
      String whoisInfoString = null;

      
      /// About progress bars: http://stackoverflow.com/questions/11099012/android-spin-refresh-button-while-reloading
      ProgressBar pb = (ProgressBar) findViewById(R.id.progressBar1);
      
       
      if (urlText.getText().toString().equals(""))
          {
          //both are empty, display message        
          displayMessageDialog("Please enter either a hostname or IP address to lookup.","No Value");
            return;
          }
      else
        {
        lookupString = urlText.getText().toString();        
        }
      pb.setVisibility(View.VISIBLE);
      LookupWhoisTask lookupWhoisTask = new LookupWhoisTask();
      whoisInfoString = runLookupTask(lookupWhoisTask,lookupString);
      
      if (whoisInfoString == null)
      {
        pb.setVisibility(View.GONE);
        return;
      }
      
      Intent intent = new Intent(this, DisplayWhoisActivity.class);
      
      
      
      intent.putExtra(WHOIS_INFO, whoisInfoString );

      pb.setVisibility(View.GONE);
      startActivity(intent);
      
    }  
    /**
     * @fn  protected String runLookupTask(LookupTask lookupTask, String lookupString)
     * @brief This function runs the various LookupTasks on a separate thread. 
     * Android does not allow network calls to be made on the main thread, thus the need to create an AsyncTask to do the work.
     * More from http://stackoverflow.com/questions/6343166/android-os-networkonmainthreadexception
     * 
     * @param lookupTask LookupTask that is being called
     * @param lookupString String that is the hostname/ipaddress to be looked up.
     * @return Result of lookup
     * @return If lookup failed, display exception in a dialog and return null
     */
    
    
    protected String runLookupTask(LookupTask lookupTask, String lookupString) 
    {
    AsyncTask<String, Void, String> task = lookupTask.execute(lookupString);
      String result = null;
    try 
    {
      // Get the results of the task.
      result = task.get();
      if (result == null)
      {
        // if we didn't get a result, grab the exception and display it as a dialog.
          String message = lookupTask.getExceptionMsg();// E.toString();
          String title = lookupTask.getException().toString();
        displayMessageDialog(message,title);
        }

    
    }
    catch (Exception taskE)
    {
      // display the exception as a toast.
        String message = taskE.getMessage();// E.toString();
        String title = taskE.toString();
      displayMessageDialog(message,title);
    }
    return result;
      
    }
    /**
     * @fn public void displayToast(String message)
     * @brief Displays a popup "Toast" message to the user.
     * Displaying toasts from http://developer.android.com/guide/topics/ui/notifiers/toasts.html
     * @param message Message to display
     */
    public void displayToast(String message)
    {
      Context context = this.getApplicationContext();
    int duration = Toast.LENGTH_SHORT;
    
    Toast toast = Toast.makeText(context, message, duration);
    toast.show();
    }
    
    /**
     * @fn public void displayMessageDialog(String message, String title)
     * @brief Displays a message dialog to the user.
     * Displaying message dialogs from http://www.mkyong.com/android/android-alert-dialog-example/
     * @param message Message to display
     * @param title Title of dialog
     * 
     */
    
    public void displayMessageDialog(String message, String title)
    {
      
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
 
    // set title
    if (title == null)
    {
      title = "Message";
    }
    alertDialogBuilder.setTitle(title);
 
    // set dialog message
    alertDialogBuilder
        .setMessage(message)
        .setCancelable(false)
        .setPositiveButton("OK",new DialogInterface.OnClickListener() {
          public void onClick(DialogInterface dialog,int id) {
            // if this button is clicked, just close
            // the dialog box and do nothing
            dialog.cancel();
          }
          })
        ;
 
        // create alert dialog
        AlertDialog alertDialog = alertDialogBuilder.create();
 
        // show it
        alertDialog.show();
    }
    
    
    
}

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