title: Not finish the activity use theme dialog
body: <p>here is my code</p>
  
  <pre><code>@Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          AlertOn();
      }
  
      private void AlertOn() {    
           alertbox = new AlertDialog.Builder(this).create();
          alertbox.setIcon(R.drawable.icon);
          alertbox.setTitle(getIntent().getStringExtra("Title"));
          alertbox.setMessage(getIntent().getStringExtra("Message"));
          alertbox.setButton("Ok", new DialogInterface.OnClickListener() {
              public void onClick(final DialogInterface dialog, int arg1) {               
                  dialog.dismiss();
                  Intent startActivity = new Intent(); 
                  startActivity.setClass(getApplicationContext(), moontech.fax.mFax.class); 
                  startActivity.setAction(NotificationAlert.class.getName()); 
                  startActivity.setFlags( 
                          Intent.FLAG_ACTIVITY_NEW_TASK 
                          | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);      
                   startActivity(startActivity);
                   finish();
              }
          });
  
          alertbox.show();        
      }
  </code></pre>
  
  <p>and in manifeast file declare</p>
  
  <pre><code>&lt;activity android:name="com.demo.notificationalert"
              android:theme="@android:style/Theme.Dialog" 
              android:screenOrientation="portrait" /&gt;
  </code></pre>
  
  <p>but when display dialog and without press ok i use back from device then that activity not finished.</p>