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private void showDialog() {
    LayoutInflater inflater = LayoutInflater.from(getActivity());
    View dlgView = inflater.inflate(R.layout.special_code_input_dlg, null);
    final EditText et = (EditText) dlgView.findViewById(R.id.special_code_input);

    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle(R.string.set_special_code_title)
            .setMessage(R.string.set_special_code_message)
            .setView(dlgView) // 设置view
            .setPositiveButton(R.string.dlg_submit, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    String code = et.getText().toString();
                    Toast.makeText(getActivity(), "获取输入的code=" + code, Toast.LENGTH_LONG).show();
                }
            }).setCancelable(true);
    AlertDialog dlg = builder.create();
    dlg.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); // 弹出系统级别的dlg  需要系统权限
    dlg.show();
}