Android将Activity添加到有意图的对话框

public class MyDialogFragment extends DialogFragment {
    public static MyDialogFragment newInstance() {
        MyDialogFragment fragment = new MyDialogFragment();
        return fragment;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle("提示")
                .setMessage("这是一个对话框")
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        // 用户点击确定按钮的处理逻辑
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        // 用户点击取消按钮的处理逻辑
                    }
                });
        return builder.create();
    }
}

MyDialogFragment dialogFragment = MyDialogFragment.newInstance();
dialogFragment.show(getSupportFragmentManager(), "dialog");