title: Use of getActivity
body: <p>First of all sorry if this post may seem a duplicate but I am very new to Android programming and posting this question only when I am still not able to get a satisfactory answer for use of getActivity.</p>
  
  <p>Theoretically I understand the use of getActivity() from the several posts here but I am confused how it is working in my code.</p>
  
  <p>I have a class MainActivity from which I am creating a dialog onclick of a checkbox.
  I have another class TaxDialog where the dialog is implemented. On click of Yes/No buttons I am calling methods define in MainActivity class.
   Below are the codes:</p>
  
  <p><strong>MainActivty</strong></p>
  
  <pre><code>    import android.annotation.SuppressLint;
  import android.os.Bundle;
  import android.support.v4.app.DialogFragment;
  import android.support.v7.app.ActionBarActivity;
  import android.util.Log;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.View;
  import android.widget.Button;
  import android.widget.CheckBox;
  import android.widget.EditText;
  import android.widget.TextView;
  import android.widget.Toast;
  
  
  
  public class MainActivity extends ActionBarActivity implements View.OnClickListener, View.OnFocusChangeListener {
  
  // onCheck of checkbox showNoticeDialog is called
  
      public void showNoticeDialog() {
          // Create an instance of the dialog fragment and show it
          Log.i("MyActivity", "Inside showNoticeDialog");
          DialogFragment dialog = new TaxDialog();
          Bundle args = new Bundle();
          args.putString("title", "Test");
          args.putString("message", "Test Message");
          dialog.setArguments(args);
  
          dialog.show(getSupportFragmentManager(), "dialog");
  
  
      }
     public void doPositiveClick(){
         Log.i("MyActivity", "Inside +ve");
     }
      public void doNegativeClick(){
          Log.i("MyActivity", "Inside -ve");
      }
  
  }
  </code></pre>
  
  <p><strong>TaxDialog</strong></p>
  
  <pre><code>import android.app.Activity;
  import android.app.AlertDialog;
  import android.app.Dialog;
  import android.content.DialogInterface;
  import android.os.Bundle;
  import android.support.v4.app.DialogFragment;
  import android.util.Log;
  
  public class TaxDialog extends DialogFragment {
  
      @Override
      public Dialog onCreateDialog(Bundle savedInstanceState) {
          Bundle args = getArguments();
  
          String title = args.getString("title");
  
          String message = args.getString("message");
          AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
          builder.setTitle(title);
  
          builder.setMessage(message);
          builder.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int which) {
                  //getTargetFragment().onActivityResult(getTargetRequestCode(), Activity.RESULT_OK, null);
                  Log.i("MyActivity", "Expected fault area.");
                  ((MainActivity) getActivity()).doPositiveClick();
              }
          });
          builder.setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int which) {
                  ((MainActivity) getActivity()).doNegativeClick();
              }
          });
          builder.create();
  
          return builder.create();
      }
  
  }
  </code></pre>
  
  <p>Here I want to understand how below line works</p>
  
  <pre><code>((MainActivity) getActivity()).doPositiveClick();
  </code></pre>
  
  <p>and also please make me aware of other ways of doing the same thing (something like MainActivity.this.getActivity() or something else).</p>
  
  <p>Thanks a lot.</p>
  
  <p><strong>EDIT</strong></p>
  
  <p>Thanks everyone. Probably I framed the question incorrectly. My only doubt was how getActivity() returns the Activity reference. Now I understand.</p>