从AppCompatPreferenceActivity扩展的类中的DialogFragment

我的问题是,我的偏好活动从 AppCompatPreferenceActivity 我需要展示一个 DialogFragment

DialogFragmente dialogFragment= new MyDialogFragmentClass()
DialogFragment.show(getSupportFragmentManager(),"My Dialog")

由于无法使用 getSupportFragmentManager() 方法所以我的问题是,如果我的类从AppCompatipPreferenceActivity扩展而来,我该如何使用该方法。

我试过使用 getFragmentManager() 相反,但它也不起作用。

这是我的课程:

public class Settings_acticity extends AppCompatPreferenceActivity {
    private SwitchPreference banner_switch;
    private SharedPreferences sharedPreferences;
    private ListPreference interstial_ad;

    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.preferences);
        DialogFragment dialogFragment = new MyDialog();
        dialogFragment.show(getSupportFragmentManager(), "My dialog");
    }
 }

和DialogFragment类:

public class MyDialog extends DialogFragment {


    public MyDialog(){
        // Required empty public constructor
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        View vista=getActivity().getLayoutInflater().inflate(R.layout.fragment_MyDialog,null);
        setCancelable(false);

        builder.setView(vista).setPositiveButton(R.string.aceptar, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                //Yes Code
            }
        }).setNegativeButton(R.string.cancelar, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
            //No code
            }
        });
        return builder.create();
    }

}

谢谢你的帮助!