android wifi信號強度不能正常傳送

Question

我在wpa_supplicant中使用下面的代碼來獲取Android中的wifi信號強度。雖然路由器距離1米，但我能夠獲得鏈接速度，但信號強度總是顯示-110dB。

代碼：

if ((os_strcasecmp(cmd, "rssi") == 0) || (os_strcasecmp(cmd, "rssi-approx") == 0)) { 
     struct iwreq wrq; 
     struct iw_statistics stats; 
     signed int rssi; 
     wpa_printf(MSG_DEBUG, ">>>. DRIVER AWEXT RSSI "); 
     wrq.u.data.pointer = (caddr_t) &stats; 
     wrq.u.data.length = sizeof(stats); 
     wrq.u.data.flags = 1; /* Clear updated flag */ 
     os_strncpy(wrq.ifr_name, drv->wext->ifname, IFNAMSIZ); 

     if (ioctl(drv->wext->ioctl_sock, SIOCGIWSTATS, &wrq) < 0) { 
      perror("ioctl[SIOCGIWSTATS]"); 
      ret = -1; 
     } else { 
      if (stats.qual.updated & IW_QUAL_DBM) { 
       /* Values in dBm, stored in u8 with range 63 : -192 */ 
       rssi = (wrq.u.qual.level > 63) ? 
        wrq.u.qual.level - 0x100 : 
        wrq.u.qual.level; 
      } else { 
       rssi = wrq.u.qual.level; 
      } 

      if (drv->ssid_len != 0 && drv->ssid_len < buf_len) { 
       os_memcpy((void *) buf, (void *) (drv->ssid), 
         drv->ssid_len); 
       ret = drv->ssid_len; 
       ret += snprintf(&buf[ret], buf_len-ret, 
         " rssi %d\n", rssi); 
       if (ret < (int)buf_len) { 
        return(ret); 
       } 
       ret = -1; 
      } 
     } 
    } 

Answer 1

下面的代碼將提供wifi的強度RSSI值...

希望這將有助於你.....

public class Wifi2 extends Activity{ 

    Context context; 

    @Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 


    context=this; 
} 

    @Override 
    public void onResume() { 
     super.onResume(); 
     //Note: Not using RSSI_CHANGED_ACTION because it never calls me back. 
     IntentFilter rssiFilter = new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION); 
     this.registerReceiver(myRssiChangeReceiver, rssiFilter); 

     WifiManager wifiMan=(WifiManager)context.getSystemService(Context.WIFI_SERVICE); 
     wifiMan.startScan(); 
    } 


     @Override 
    public void onPause() { 
     super.onPause(); 
     this.unregisterReceiver(myRssiChangeReceiver); 

    } 
    /** 
    * Broadcast receiver to update 
    * s 
    */ 
    private BroadcastReceiver myRssiChangeReceiver 
      = new BroadcastReceiver(){ 
     @Override 
     public void onReceive(Context arg0, Intent arg1) { 
      WifiManager wifiMan=(WifiManager)context.getSystemService(Context.WIFI_SERVICE); 
      wifiMan.startScan(); 
      int newRssi = wifiMan.getConnectionInfo().getRssi(); 
      Toast.makeText(context, ""+newRssi, Toast.LENGTH_SHORT).show(); 

    }}; 

}