在DialogFragment ()之前获取show子类中的父活动

public interface OnParentActivityListener {
    void onParentActivityReady(Activity activity);
}

private OnParentActivityListener mListener;

@Override
public void onAttach(@NonNull Context context) {
    super.onAttach(context);
    if (context instanceof OnParentActivityListener) {
        mListener = (OnParentActivityListener) context;
    } else {
        throw new RuntimeException(context.toString()
                + " must implement OnParentActivityListener");
    }
}

@Override
public void onDetach() {
    super.onDetach();
    mListener = null;
}

if (mListener != null) {
    mListener.onParentActivityReady(getActivity());
}

public class MainActivity extends AppCompatActivity implements OnParentActivityListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 创建并显示DialogFragment
        MyDialogFragment dialogFragment = new MyDialogFragment();
        dialogFragment.show(getSupportFragmentManager(), "dialog");
    }

    @Override
    public void onParentActivityReady(Activity activity) {
        // 在这里获取父活动的引用
        // 可以进行相关操作，如调用父活动的方法或访问父活动的成员变量
    }
}