wifi 信号强度问题

Question

我查了文档，
好象应该在 WifiManager 中使用 EXTRA_NEW_RSSI
可是我不知道该怎样使用，请高手指教

Answer 1

监听Wifi状态发生改变的广播，通过Intent的方法getExtra(WifiManager.EXTRA_NEW_RSSI
)或者getXxxExtra()获取相应的值

Answer 2

能给写点代码吗？
我现在还不会用 Intent 和广播
非常感谢

Answer 3

public class WifisignalActivity extends Activity {
        TextView mainText;
        WifiManager mainWifi;
        WifiReceiver receiverWifi;
        List<ScanResult> wifiList;
        StringBuilder sb = new StringBuilder();        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);
                setTitle("eoe教程: Wifi Test.  -by:IceskYsl");
                mainText = (TextView) findViewById(R.id.wifi);
                mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);                receiverWifi = new WifiReceiver();
                registerReceiver(receiverWifi, new IntentFilter(
                                WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
                mainWifi.startScan();
                mainText.setText("\nStarting Scan...\n");
        }        public boolean onCreateOptionsMenu(Menu menu) {
                menu.add(0, 0, 0, "Refresh");
                return super.onCreateOptionsMenu(menu);
        }        public boolean onMenuItemSelected(int featureId, MenuItem item) {
                mainWifi.startScan();
                mainText.setText("Starting Scan");
                return super.onMenuItemSelected(featureId, item);
        }        protected void onPause() {
                unregisterReceiver(receiverWifi);
                super.onPause();
        }        protected void onResume() {
                registerReceiver(receiverWifi, new IntentFilter(
                                WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
                super.onResume();
        }        class WifiReceiver extends BroadcastReceiver 
        {
                public void onReceive(Context c, Intent intent) 
                {
                 //Bundle bd = intent.getExtras();
                 //if (bd != null)
                 //{
                 // int nrssi = bd.getInt(WifiManager.EXTRA_NEW_RSSI);
                 //}
                        sb = new StringBuilder();
                        wifiList = mainWifi.getScanResults();
                        //bd = intent.getExtras();
                        for (int i = 0; i < wifiList.size(); i++) 
                        {
                                sb.append(new Integer(i + 1).toString() + ".");
                                sb.append((wifiList.get(i)).toString());
                                sb.append("\n\n");
                        }
                        mainText.setText(sb);
                }
        }
这是我在网上找的代码，运行后信号强度一直显示 -1，而且除了程序启动时能进入到 WifiReceiver 中，运行期间都没有进入过该函数，我有三个WIFI信号源
注释的几行是我写的 INTENT，取到的 bundle 是 null 
请大家指点下该怎样做，哪怕是个提示也行啊

Answer 4

不明白，我看到的 ScanResult 里的 level 都是 -1

Answer 5

using System;
using System.Diagnostics;namespace WifiTest
{
    class Program
    {
        static void Main(string[] args)
        {
            Process proc = new Process();
            proc.StartInfo.CreateNoWindow = true;
            proc.StartInfo.FileName = "netsh";
            proc.StartInfo.Arguments = "wlan show networks mode=bssid";
            proc.StartInfo.RedirectStandardOutput = true;
            proc.StartInfo.UseShellExecute = false;
            proc.Start();
            string output = proc.StandardOutput.ReadToEnd();
            proc.WaitForExit();            Console.WriteLine(output);
            Console.Read();
        }
    }
}