Question

我正在尝试获取Wifi的MAC地址，BSSID和LINK_speed。我注意到，即使Wifi关闭，所有三个都显示值。我关闭手机然后再打开但不打开wifi。应用程序崩溃任何审查这三个项目，我无法尝试/捕获错误。如果我打开wifi然后关闭我可以询问项目和应用程序运行正常。它像BSSID和LINKSPEED真的是'LAST'BSSID和'LAST'LINKSPEED。开机后对MAC地址视而不见但是没有正常行为的wifi？有没有办法陷阱错误，以防止强行关闭应用程序？

    WifiManager wifi;
    wifi = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
    WifiInfo wifiInfo = wifi.getConnectionInfo();
    int ipAddress = wifiInfo.getIpAddress();
    ipAddress = wifiInfo.getIpAddress();
    //above work no matter whether wifi on or off before

    String BSSID=wifiInfo.getBSSID();  //<<<<< ERRORS FORCE CLOSE IF NOT EVER CONNECTED
    int WifiLinkSpeed=wifiInfo.getLinkSpeed(); printi("link speed",WifiLinkSpeed);  
    String MacAddress=wifiInfo.getMacAddress(); Log.e("MAC address",MacAddress);
    //All three of these FORCE close if WIFI has never been turn on

Answer 1

试试这个，

WifiManager wifiManager = (WifiManager) Settings.cntxt.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
strMacAddr = wifiInfo.getMacAddress();
if(strMacAddr==null) {
    strMacAddr = "Unknown MAC";
}

Answer 2

虽然你确实说过你尝试过try / catch ...你抓到了哪些错误/异常？显然不是正确的。

自从我做任何Android编程以来已经有一段时间了，但这就是问题的关键......找出尝试这些功能时会触发的异常。

try {
    // don't declare variables inside block, you'll limit scope
    BSSID=wifiInfo.getBSSID();  //<<<<< ERRORS FORCE CLOSE IF NOT EVER CONNECTED
    WifiLinkSpeed=wifiInfo.getLinkSpeed(); printi("link speed",WifiLinkSpeed);  
    MacAddress=wifiInfo.getMacAddress(); Log.e("MAC address",MacAddress);
    //All three of these FORCE close if WIFI has never been turn on
}
catch { /* something bad happened, handle it */ }
// continue on since all is good in the world today...

Android MAC地址上的BUG或正常行为？

2 个答案: