final ProgressDialog ps = ProgressDialog.show(MainActivity.this, "搜索网络", "请等待...");                new Thread(){                    @Override                    public void run() {                        try {                            sleep(11000);                        } catch (Exception e) {                            // TODO: handle exception                        }                        finally{                            ps.dismiss();                        }                    }                }.start();                ps.show();