title: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference error
body: <p>I created a DialogFragment.
  The Dialog got a EditText and I call it from the dialog xml.
  But there is the error: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference</p>
  
  <p>New in this code:</p>
  
  <pre><code>    AlertDialog alertDialog;
  AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
  </code></pre>
  
  <p>and</p>
  
  <pre><code>final EditText editText = (EditText) alertDialog.findViewById(R.id.editTextPasswordDeveloper);
  </code></pre>
  
  <p>My Code:</p>
  
  <pre><code>public class DeveloperLoginDialogFragment extends DialogFragment {
  
  EditText editText;
  
  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
  
      final LayoutInflater inflaterDialog = getActivity().getLayoutInflater();
  
      AlertDialog alertDialog;
      AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
  
      alertDialog = builder.create();
  
     // final AlertDialog alertDialog = new AlertDialog.Builder(getActivity());
      builder.setCancelable(false);
      builder.setView(inflaterDialog.inflate(R.layout.alertdialog_developer, null));
      final EditText editText = (EditText) alertDialog.findViewById(R.id.editTextPasswordDeveloper);
      builder.setTitle("Entwickler-Login");
      builder.setMessage("Um dich als Entwickler zu verifizieren, gib den Entwickler-Code bitte unten ein.");
      builder.setPositiveButton("Verifizieren", new DialogInterface.OnClickListener() {
          @Override
          public void onClick(DialogInterface dialog, int which) {
              if(editText.getText().toString().equals("7846")) {
                  dialog.dismiss();
                  Toast.makeText(getActivity().getApplicationContext(),"Erfolgreich verifiziert!", Toast.LENGTH_LONG).show();
              }
          }
      });
      builder.setNegativeButton("Abbrechen", new DialogInterface.OnClickListener() {
          @Override
          public void onClick(DialogInterface dialog, int which) {
              Intent intent = new Intent(getActivity(), MainActivity.class);
              startActivity(intent);
          }
      });
      return builder.create();
  }
  </code></pre>
  
  <p>}</p>