title: Change the background color of a pop-up dialog
body: <p>I wrote android code that shows a pop-up dialog but I want to change the background color from black to white , and then the color of the writing.</p>
  
  <p>This is the dialog's code: </p>
  
  <pre><code>mPrefs = PreferenceManager.getDefaultSharedPreferences(this);
  
      Boolean welcomeScreenShown = mPrefs.getBoolean(welcomeScreenShownPref, false);
  
      if (!welcomeScreenShown) {
  
  
          String whatsNewText = getResources().getString(R.string.Text);
          new AlertDialog.Builder(this).setMessage(whatsNewText).setPositiveButton(
                  R.string.ok, new DialogInterface.OnClickListener(){
              public void onClick(DialogInterface dialog, int which) {
                  dialog.dismiss();
              }
          }).show();
          SharedPreferences.Editor editor = mPrefs.edit();
          editor.putBoolean(welcomeScreenShownPref, true);
          editor.commit(); // Very important to save the preference
      }
  </code></pre>