在Android应用中AlertDialog的点击按钮无法关闭对话框如何解决

private void openDialog() { LinearLayout linearLayout = (LinearLayout) LayoutInflater.from(getContext()).inflate(R.layout.change_password_dialog, null); final EditText originPasswordEt = (EditText) linearLayout.findViewById(R.id.origin_password); TextView forgetPassword = (TextView) linearLayout.findViewById(R.id.forget_password); final AlertDialog dialog = new AlertDialog.Builder(getContext())  .setView(linearLayout)  .setPositiveButton("确定", new DialogInterface.OnClickListener() {   @Override    public void onClick(DialogInterface dialog, int which) {    String originPassword = originPasswordEt.getText().toString().trim();     //传到后台    }  })  .create(); dialog.show();}