Android检测WIFI连接、提示框延时消失

Android检测系统WIFI是否连接？如没有连接，显示提示框，提示进行设置，当点击设置进入系统WIFI界面后1秒钟，提示框自动消失。

代码：

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public boolean isWifiConnected(Context context) {         ConnectivityManager connectivityManager = (ConnectivityManager) context                 .getSystemService(Context.CONNECTIVITY_SERVICE);         NetworkInfo wifiNetworkInfo = connectivityManager                 .getNetworkInfo(ConnectivityManager.TYPE_WIFI);         if (wifiNetworkInfo.isConnected()) {             return true;         } else {             builder.setMessage("请检查WIFI是否连接成功！");             builder.setTitle("提示信息");             builder.setPositiveButton("设置",                     new DialogInterface.OnClickListener() {                         public void onClick(final DialogInterface dialog,                                 int which) {                             Intent intent = new Intent(                                     Settings.ACTION_WIFI_SETTINGS);                             startActivity(intent);                             //点击设置1秒后消失                             new Handler().postDelayed(new Runnable() {                                 @Override                                 public void run() {                                     dialog.dismiss();                                 }                             }, 1000);                         }                     });               builder.setNegativeButton("取消",                     new android.content.DialogInterface.OnClickListener() {                         public void onClick(DialogInterface dialog, int which) {                             dialog.dismiss();                         }                     });             dialog = builder.create();             dialog.show();             return false;         }     }

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