tor-android/src/org/torproject/android/Orbot.java

/* Copyright (c) 2009, Nathan Freitas, Orbot / The Guardian Project - https://guardianproject.info */
/* See LICENSE for licensing information */

package org.torproject.android;




import org.torproject.android.service.ITorService;
import org.torproject.android.service.ITorServiceCallback;
import org.torproject.android.service.TorServiceConstants;
import org.torproject.android.settings.ProcessSettingsAsyncTask;
import org.torproject.android.settings.SettingsPreferences;
import org.torproject.android.wizard.LotsaText;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.NotificationManager;
import android.app.ProgressDialog;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.RemoteException;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnLongClickListener;
import android.widget.ImageView;
import android.widget.TextView;

public class Orbot extends Activity implements OnLongClickListener, TorConstants
{
        
        /* Useful UI bits */
        // so this is probably pretty obvious, here, but also an area
        // which we might see quite a bit of change+complexity was the main screen
        // UI gets new features
        private TextView lblStatus = null; //the main text display widget
        private ImageView imgStatus = null; //the main touchable image for activating Orbot
        private ProgressDialog progressDialog; //the spinning progress dialog that shows up now and then
        private MenuItem mItemOnOff = null; //the menu item which we toggle based on Orbot state
        
        /* Some tracking bits */
        private int torStatus = TorServiceConstants.STATUS_OFF; //latest status reported from the tor service
        // this is a value we get passed back from the TorService
        
        /* Tor Service interaction */
         /* The primary interface we will be calling on the service. */
        ITorService mService = null; //interface to remote TorService 
        private boolean autoStartOnBind = false; //controls whether service starts when class binds to it

        SharedPreferences prefs; //what the user really wants!
        
    /** 
    * When the Orbot activity is created, we call startService
    * to ensure the Tor remote service is running. However, it may
    * already be running, and this should not create more than one instnace
     */
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
      //if Tor binary is not running, then start the service up
      //might want to look at whether we need to call this every time
      //or whether binding to the service is enough
                startService(new Intent(INTENT_TOR_SERVICE));
                
            //something to play with on the UI branch
            setTheme(android.R.style.Theme_Black_NoTitleBar);
            
            prefs = PreferenceManager.getDefaultSharedPreferences(this);
            
            //same here - layout_main has been cleaned up since 1.0.5.2 a bit (removed table as you recmnd)
            //but ther eis more to be done
            setContentView(R.layout.layout_main);
                
            //obvious? -yep got everything so far
            lblStatus = (TextView)findViewById(R.id.lblStatus);
                lblStatus.setOnLongClickListener(this);
            imgStatus = (ImageView)findViewById(R.id.imgStatus);
            imgStatus.setOnLongClickListener(this);
            
            

    }
    
   /*
    * Create the UI Options Menu (non-Javadoc)
    * @see android.app.Activity#onCreateOptionsMenu(android.view.Menu)
    */
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        
        MenuItem mItem = null;
        
        mItemOnOff = menu.add(0, 1, Menu.NONE, getString(R.string.menu_start));
        mItemOnOff.setIcon(android.R.drawable.ic_menu_share);
        mItemOnOff.setAlphabeticShortcut('t');
        
        mItem = menu.add(0, 4, Menu.NONE, getString(R.string.menu_settings));
        mItem.setIcon(R.drawable.ic_menu_register);
       
        mItem = menu.add(0, 7, Menu.NONE, getString(R.string.menu_verify));
        mItem.setIcon(R.drawable.ic_menu_check);
      
        mItem =  menu.add(0,6, Menu.NONE, getString(R.string.menu_about));
        mItem.setIcon(R.drawable.ic_menu_about);
        
        mItem = menu.add(0, 3, Menu.NONE, getString(R.string.menu_wizard));
        mItem.setIcon(R.drawable.ic_menu_goto);
       
        mItem = menu.add(0, 8, Menu.NONE, getString(R.string.menu_exit));
        mItem.setIcon(R.drawable.ic_menu_exit);
       
        
        return true;
    }
    

    private void showAbout ()
        {
                
	        LayoutInflater li = LayoutInflater.from(this);
	        View view = li.inflate(R.layout.layout_about, null); 
	        
	        String version = "";
	        
	        try {
	        	version = getPackageManager().getPackageInfo(getPackageName(), 0).versionName;
	        } catch (NameNotFoundException e) {
	        	version = "Version Not Found";
	        }
	        
	        TextView versionName = (TextView)view.findViewById(R.id.versionName);
	        versionName.setText(version);    
	        
	                new AlertDialog.Builder(this)
	        .setTitle(getString(R.string.button_about))
	        .setView(view)
	        .show();
        }
    
    /* When a menu item is selected launch the appropriate view or activity
     * (non-Javadoc)
         * @see android.app.Activity#onMenuItemSelected(int, android.view.MenuItem)
         */
        public boolean onMenuItemSelected(int featureId, MenuItem item) {
                
                super.onMenuItemSelected(featureId, item);
                
                if (item.getItemId() == 1)
                {
                        
                        try
                        {
                                
                                if (mService == null)
                                {
                                
                                }
                                else if (mService.getStatus() == TorServiceConstants.STATUS_OFF)
                                {
                                    if (mItemOnOff != null)
                                            mItemOnOff.setTitle(R.string.menu_stop);
                                        startTor();
                                        
                                }
                                else
                                {
                                    if (mItemOnOff != null)
                                            mItemOnOff.setTitle(R.string.menu_start);
                                        stopTor();
                                        
                                }
                                
                        }
                        catch (RemoteException re)
                        {
                                Log.w(TAG, "Unable to start/top Tor from menu UI", re);
                        }
                }
                else if (item.getItemId() == 4)
                {
                        showSettings();
                }
                else if (item.getItemId() == 3)
                {
                        showHelp();
                }
                else if (item.getItemId() == 7)
                {
                        doTorCheck();
                }
                else if (item.getItemId() == 8)
                {
                        //exit app
                        doExit();
                        
                        
                }
                else if (item.getItemId() == 6)
                {
                        showAbout();
                        
                        
                }
                
        return true;
        }
        
        /**
        * This is our attempt to REALLY exit Orbot, and stop the background service
        * However, Android doesn't like people "quitting" apps, and/or our code may not
        * be quite right b/c no matter what we do, it seems like the TorService still exists
        **/
        private void doExit ()
        {
                try {
                
                        //one of the confusing things about all of this code is the multiple
                        //places where things like "stopTor" are called, both in the Activity and the Service
                        //not something to tackle in your first iteration, but i thin we can talk about fixing
                        //terminology but also making sure there are clear distinctions in control
                        stopTor();
                        
                        //perhaps this should be referenced as INTENT_TOR_SERVICE as in startService
                        stopService(new Intent(ITorService.class.getName()));
                        
                        //clears all notifications from the status bar
                NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
                        mNotificationManager.cancelAll();
                
                        
                } catch (RemoteException e) {
                        Log.w(TAG, e);
                }
                
                finish();
                
        }
        
        /* Return to the main view when the back key is pressed
         * (non-Javadoc)
         * @see android.app.Activity#onKeyDown(int, android.view.KeyEvent)
         */
        /*
        public boolean onKeyDown(int keyCode, KeyEvent event){
                
                //yeah this should probably go away now :) - or not
                if(keyCode==KeyEvent.KEYCODE_BACK){

                        if(currentView != R.layout.layout_main){
                                        
                                        showMain ();
                                        return true;
                        }
                        else{
                                return super.onKeyDown(keyCode, event);
                        }
                }
        
                return super.onKeyDown(keyCode, event);
                
        }*/
 
    /* (non-Javadoc)
	 * @see android.app.Activity#onPause()
	 */
	protected void onPause() {
		super.onPause();
		
		hideProgressDialog();

		if (aDialog != null)
			aDialog.dismiss();
	}

	public void onSaveInstanceState(Bundle savedInstanceState) {
		  // Save UI state changes to the savedInstanceState.
		  // This bundle will be passed to onCreate if the process is
		  // killed and restarted.
		  // etc.
		  super.onSaveInstanceState(savedInstanceState);
		}
	
	public void onRestoreInstanceState(Bundle savedInstanceState) {
	  super.onRestoreInstanceState(savedInstanceState);
	  // Restore UI state from the savedInstanceState.
	  // This bundle has also been passed to onCreate.
	 
	}
	
	private void doTorCheck ()
	{
		
		DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
			
		    @Override
		    public void onClick(DialogInterface dialog, int which) {
		        switch (which){
		        case DialogInterface.BUTTON_POSITIVE:
		            
		    		openBrowser(URL_TOR_CHECK);

					
		        	
		            break;

		        case DialogInterface.BUTTON_NEGATIVE:
		        
		        	//do nothing
		            break;
		        }
		    }
		};

		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setMessage(R.string.tor_check).setPositiveButton(R.string.btn_okay, dialogClickListener)
		    .setNegativeButton(R.string.btn_cancel, dialogClickListener).show();

	}
	
	private void enableHiddenServicePort (int hsPort)
	{
		SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
		Editor pEdit = prefs.edit();
		
		String hsPortString = prefs.getString("pref_hs_ports", "");
		
		if (hsPortString.length() > 0 && hsPortString.indexOf(hsPort+"")==-1)
			hsPortString += ',' + hsPort;
		else
			hsPortString = hsPort + "";
		
		pEdit.putString("pref_hs_ports", hsPortString);
		pEdit.putBoolean("pref_hs_enable", true);
		
		pEdit.commit();
		
		String onionHostname = prefs.getString("pref_hs_hostname","");

		Intent nResult = new Intent();
		nResult.putExtra("hs_host", onionHostname);
		setResult(RESULT_OK, nResult);
	
	}
	
	/* (non-Javadoc)
	 * @see android.app.Activity#onResume()
	 */
	protected void onResume() {
		super.onResume();
		
		bindService();
		
		 updateStatus("");
		 
		if (getIntent() == null)
			return;
		
		String action = getIntent().getAction();
		
		if (action == null)
			return;
		
		if (action.equals("org.torproject.android.REQUEST_HS_PORT"))
		{
			
			DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
			    @Override
			    public void onClick(DialogInterface dialog, int which) {
			        switch (which){
			        case DialogInterface.BUTTON_POSITIVE:
			            
			        	int hsPort = getIntent().getIntExtra("hs_port", -1);
						
			        	enableHiddenServicePort (hsPort);
			        	
						finish();
						
			        	
			            break;

			        case DialogInterface.BUTTON_NEGATIVE:
			            //No button clicked
			        	finish();
			            break;
			        }
			    }
			};

        	int hsPort = getIntent().getIntExtra("hs_port", -1);

			String requestMsg = "An app wants to open a server port (" + hsPort + ") to the Tor network. This is safe if you trust the app.";
			AlertDialog.Builder builder = new AlertDialog.Builder(this);
			builder.setMessage(requestMsg).setPositiveButton("Allow", dialogClickListener)
			    .setNegativeButton("Deny", dialogClickListener).show();
			
		
		}
		else if (action.equals("org.torproject.android.START_TOR"))
		{
			autoStartOnBind = true;
			
			if (mService == null)
				bindService();
			
		}
		else
		{
			
			//setTitle(getString(R.string.app_name) + ' ' + getString(R.string.app_version));
	    
			NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
			mNotificationManager.cancelAll();
			
			SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
	
			boolean showWizard = prefs.getBoolean("show_wizard",true);
			
			if (showWizard)
			{
			
				Editor pEdit = prefs.edit();
				
				pEdit.putBoolean("show_wizard",false);
				
				pEdit.commit();
				
				startActivityForResult(new Intent(getBaseContext(), LotsaText.class), 1);

			}
			
		}
	}

	/* (non-Javadoc)
	 * @see android.app.Activity#onStart()
	 */
	protected void onStart() {
		super.onStart();
		
		
		updateStatus ("");
		
	}

	/* (non-Javadoc)
	 * @see android.app.Activity#onStop()
	 */
	protected void onStop() {
		super.onStop();
		
		//unbindService();
	}



	/*
	 * Launch the system activity for Uri viewing with the provided url
	 */
	private void openBrowser(String url)
	{
		startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
		
	}
	
	
	
	/*
	 * Show the help view - a popup dialog
	 */
	private void showHelp ()
	{

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);

		Editor pEdit = prefs.edit();
		pEdit.putBoolean("wizardscreen1",true);
		pEdit.commit();
		startActivityForResult(new Intent(getBaseContext(), LotsaText.class), 1);
	}
	
	
    /*
     * Load the basic settings application to display torrc
     */
        private void showSettings ()
        {
                
                startActivityForResult(new Intent(this, SettingsPreferences.class), 1);
        }
        
        
        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
                super.onActivityResult(requestCode, resultCode, data);
                
                //if we get a response from an activity we launched (like from line 527 where we launch the Settings/Prefs screen)
                //and the resultCode matches our arbitrary 1010 value, AND Tor is running
                //then update the preferences in an async background task
                if (requestCode == 1 && resultCode == 1010 && mService != null)
                {
                        new ProcessSettingsAsyncTask().execute(mService);        
                }
        }
        
        AlertDialog aDialog = null;
        
        //general alert dialog for mostly Tor warning messages
        //sometimes this can go haywire or crazy with too many error
        //messages from Tor, and the user cannot stop or exit Orbot
        //so need to ensure repeated error messages are not spamming this method
        private void showAlert(String title, String msg, boolean button)
        {
                try
                {
                        if (aDialog != null && aDialog.isShowing())
                                aDialog.dismiss();
                }
                catch (Exception e){} //swallow any errors
                
                 if (button)
                 {
                                aDialog = new AlertDialog.Builder(this)
                         .setIcon(R.drawable.icon)
                 .setTitle(title)
                 .setMessage(msg)
                 .setPositiveButton(android.R.string.ok, null)
                 .show();
                 }
                 else
                 {
                         aDialog = new AlertDialog.Builder(this)
                         .setIcon(R.drawable.icon)
                 .setTitle(title)
                 .setMessage(msg)
                 .show();
                 }
        
                 aDialog.setCanceledOnTouchOutside(true);
        }
    /*
     * Set the state of the running/not running graphic and label
     * this all needs to be looked at w/ the shift to progressDialog
     */
    public void updateStatus (String torServiceMsg)
    {
            try
            {
                    //if the serivce is bound, query it for the curren status value (int)
                    if (mService != null)
                            torStatus = mService.getStatus();
                    
                    //now update the layout_main UI based on the status
                    if (imgStatus != null)
                    {
                            
                            if (torStatus == TorServiceConstants.STATUS_ON)
                            {
                                    imgStatus.setImageResource(R.drawable.toron);

                                    hideProgressDialog();
                                    
                                    String lblMsg = getString(R.string.status_activated);
                                    //+ "\n" + torServiceMsg;
                                    
                                    lblStatus.setText(lblMsg);
                                    
                                    if (torServiceMsg != null && torServiceMsg.length() > 0)
                                    {
                                    //        showAlert("Update", torServiceMsg, false);
                                    	lblStatus.setText(torServiceMsg);
                                    }
                                    
                                    boolean showFirstTime = prefs.getBoolean("connect_first_time",true);
                                    
                                    if (showFirstTime)
                                    {
                                    
                                            Editor pEdit = prefs.edit();
                                            
                                            pEdit.putBoolean("connect_first_time",false);
                                            
                                            pEdit.commit();
                                            
                                            showAlert(getString(R.string.status_activated),getString(R.string.connect_first_time),true);
                                            
                                    }
                                    
                                    if (mItemOnOff != null)
                                            mItemOnOff.setTitle(R.string.menu_stop);
                                    

                            }
                            else if (torStatus == TorServiceConstants.STATUS_CONNECTING)
                            {
                                    
                                    imgStatus.setImageResource(R.drawable.torstarting);
                                    
                                    if (progressDialog != null)
                                            progressDialog.setMessage(torServiceMsg);
                                    
                                    if (mItemOnOff != null)
                                            mItemOnOff.setTitle(R.string.menu_stop);
                                            
                            }
                            else
                            {


                                    hideProgressDialog();
                                    
                                    imgStatus.setImageResource(R.drawable.toroff);
                                    lblStatus.setText(getString(R.string.status_disabled) + "\n" + getString(R.string.press_to_start));
                                    
                                    if (mItemOnOff != null)
                                            mItemOnOff.setTitle(R.string.menu_start);
                                    
                            }
                    }
                            
            }
            catch (RemoteException e)
            {
                    Log.e(TAG,"remote exception updating status",e);
            }
            
        
    }
  
  // guess what? this start's Tor! actually no it just requests via the local ITorService to the remote TorService instance
  // to start Tor
    private void startTor () throws RemoteException
    {
            // here we bind AGAIN - at some point i think we had to bind multiple times just in case
            // but i would love to clarify, clean this up
            bindService();
            
            // this is a bit of a strange/old/borrowed code/design i used to change the service state
            // not sure it really makes sense when what we want to say is just "startTor"
            mService.setProfile(TorServiceConstants.PROFILE_ON); //this means turn on
                
                //here we update the UI which is a bit sloppy and mixed up code wise
                //might be best to just call updateStatus() instead of directly manipulating UI in this method - yep makes sense
                imgStatus.setImageResource(R.drawable.torstarting);
                lblStatus.setText(getString(R.string.status_starting_up));
                
            
            //we send a message here to the progressDialog i believe, but we can clarify that shortly
            Message msg = mHandler.obtainMessage(TorServiceConstants.ENABLE_TOR_MSG);
            mHandler.sendMessage(msg);
            
            
            
    }
    
    //now we stop Tor! amazing!
    private void stopTor () throws RemoteException
    {
        //if the service is bound, then turn it off, using the same "PROFILE_" technique
            if (mService != null)
            {
                    mService.setProfile(TorServiceConstants.PROFILE_OFF);
                    
                    //again this is related to the progress dialog or some other threaded UI object
                    Message msg = mHandler.obtainMessage(TorServiceConstants.DISABLE_TOR_MSG);
                    mHandler.sendMessage(msg);
            }
            
     
    }
    
        /*
     * (non-Javadoc)
     * @see android.view.View.OnClickListener#onClick(android.view.View)
     */
        public boolean onLongClick(View view) {
                
                
            try
            {
                    
                if (mService != null && mService.getStatus() == TorServiceConstants.STATUS_OFF)
                {
                        
                        createProgressDialog(getString(R.string.status_starting_up));

                        startTor();
                }
                else
                {
                        
                        stopTor();
                        
                }
                    
            }
            catch (Exception e)
            {
                    Log.d(TAG,"error onclick",e);
            }
                    
            return true;
        }
        

    /**
     * This implementation is used to receive callbacks from the remote
     * service. 
     *
     * If we have this setup probably, we shouldn't have to poll or query status
     * to the service, as it should send it as it changes or when we bind/unbind to it
     * from this activity
     */
    private ITorServiceCallback mCallback = new ITorServiceCallback.Stub() {
        /**
         * This is called by the remote service regularly to tell us about
         * new values.  Note that IPC calls are dispatched through a thread
         * pool running in each process, so the code executing here will
         * NOT be running in our main thread like most other things -- so,
         * to update the UI, we need to use a Handler to hop over there.
         */
         
         //receive a new string vaule end-user displayable message from the ITorService
        public void statusChanged(String value) {
           
           //pass it off to the progressDialog
                Message msg = mHandler.obtainMessage(TorServiceConstants.STATUS_MSG);
                msg.getData().putString(HANDLER_TOR_MSG, value);
                mHandler.sendMessage(msg);
        }

                @Override //this was when we displayed the log in the main Activity; can prob take this out now
                public void logMessage(String value) throws RemoteException {
                        
                        Message msg = mHandler.obtainMessage(TorServiceConstants.LOG_MSG);
                msg.getData().putString(HANDLER_TOR_MSG, value);
                mHandler.sendMessage(msg);
                        
                }
    };
    

// this is what takes messages or values from the callback threads or other non-mainUI threads
//and passes them back into the main UI thread for display to the user
    private Handler mHandler = new Handler() {
    	
    	private String lastServiceMsg = null;
    	
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case TorServiceConstants.STATUS_MSG:

                        String torServiceMsg = (String)msg.getData().getString(HANDLER_TOR_MSG);
                        
                        if (lastServiceMsg == null || !lastServiceMsg.equals(torServiceMsg))
                        {
                        	updateStatus(torServiceMsg);
                        
                        	lastServiceMsg = torServiceMsg;
                        }
                        
                    break;
                case TorServiceConstants.LOG_MSG:
                        
                        
                    break;
                case TorServiceConstants.ENABLE_TOR_MSG:
                        
                        
                        updateStatus((String)msg.getData().getString(HANDLER_TOR_MSG));
                        
                        break;
                case TorServiceConstants.DISABLE_TOR_MSG:
                        
                        updateStatus((String)msg.getData().getString(HANDLER_TOR_MSG));
                        
                        break;
                                
                default:
                    super.handleMessage(msg);
            }
        }
        
        
        
    };

    
    /**
     * Class for interacting with the main interface of the service.
     */
     // this is the connection that gets called back when a successfull bind occurs
     // we should use this to activity monitor unbind so that we don't have to call
     // bindService() a million times
     
    private ServiceConnection mConnection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className,
                IBinder service) {
            // This is called when the connection with the service has been
            // established, giving us the service object we can use to
            // interact with the service.  We are communicating with our
            // service through an IDL interface, so get a client-side
            // representation of that from the raw service object.
            mService = ITorService.Stub.asInterface(service);
       
            // We want to monitor the service for as long as we are
            // connected to it.
            try {
                mService.registerCallback(mCallback);
           
                //again with the update status?!? :P
                updateStatus("");
                
                if (autoStartOnBind)
                {
                        autoStartOnBind = false;
                        
                        startTor();
                        
                }
            
            } catch (RemoteException e) {
                // In this case the service has crashed before we could even
                // do anything with it; we can count on soon being
                // disconnected (and then reconnected if it can be restarted)
                // so there is no need to do anything here.
                    Log.d(TAG,"error registering callback to service",e);
            }
            


           
       
          
        }

        public void onServiceDisconnected(ComponentName className) {
            // This is called when the connection with the service has been
            // unexpectedly disconnected -- that is, its process crashed.
            mService = null;
          
        }
    };
    
    //should move this up with all the other class variables
    boolean mIsBound = false;
    
    //this is where we bind! 
    private void bindService ()
    {
         //since its auto create, we prob don't ever need to call startService
         //also we should again be consistent with using either iTorService.class.getName()
         //or the variable constant       
             bindService(new Intent(ITorService.class.getName()),
                 mConnection, Context.BIND_AUTO_CREATE);
             
             mIsBound = true;
    
    }
    
    //unbind removes the callback, and unbinds the service
    private void unbindService ()
    {
            if (mIsBound) {
            // If we have received the service, and hence registered with
            // it, then now is the time to unregister.
            if (mService != null) {
                try {
                    mService.unregisterCallback(mCallback);
                    
                } catch (RemoteException e) {
                    // There is nothing special we need to do if the service
                    // has crashed.
                }
        }
            
            //maybe needs this?
            mService = null; 
            
            // Detach our existing connection.
            unbindService(mConnection);
            mIsBound = false;
            
        }
    }
        
    private void createProgressDialog (String msg)
    {
            if (progressDialog != null && progressDialog.isShowing())
                    return;
            
            progressDialog = ProgressDialog.show(Orbot.this, "", msg);        
                progressDialog.setCancelable(true);

    }
    
    private void hideProgressDialog ()
    {

                if (progressDialog != null && progressDialog.isShowing())
                {
                        progressDialog.dismiss();

                }
                
                
    }
}