在DialogFragment的活动中设置监听器

public interface OnDialogClickListener {
    void onPositiveClick();
    void onNegativeClick();
}

public class CustomDialogFragment extends DialogFragment {
    private OnDialogClickListener mListener;

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        // 设置对话框的标题、内容等
        // ...

        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                // 点击确定按钮时，通知活动执行相应的逻辑
                if (mListener != null) {
                    mListener.onPositiveClick();
                }
            }
        });

        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                // 点击取消按钮时，通知活动执行相应的逻辑
                if (mListener != null) {
                    mListener.onNegativeClick();
                }
            }
        });

        return builder.create();
    }

    public void setOnDialogClickListener(OnDialogClickListener listener) {
        mListener = listener;
    }
}

public class MainActivity extends AppCompatActivity implements OnDialogClickListener {
    // ...

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

        // 创建并显示自定义对话框
        CustomDialogFragment dialogFragment = new CustomDialogFragment();
        dialogFragment.setOnDialogClickListener(this);
        dialogFragment.show(getSupportFragmentManager(), "custom_dialog");
    }

    @Override
    public void onPositiveClick() {
        // 确定按钮点击后的逻辑
        // ...
    }

    @Override
    public void onNegativeClick() {
        // 取消按钮点击后的逻辑
        // ...
    }
}