Android之擷取wifi訊號強度

1.Android擷取wifi訊號品質：

int strength = WifiManager.calculateSignalLevel(info.getRssi(), 5);即訊號強度。

擷取方法：

private String obtainWifiInfo() {        // Wifi的連線速度及訊號強度：        WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);        // WifiInfo wifiInfo = wifiManager.getConnectionInfo();        WifiInfo info = wifiManager.getConnectionInfo();        if (info.getBSSID() != null) {            // 連結訊號強度            int strength = WifiManager.calculateSignalLevel(info.getRssi(), 5);            // 連結速度            int speed = info.getLinkSpeed();            // 連結速度單位            String units = WifiInfo.LINK_SPEED_UNITS;            // Wifi源名稱            String ssid = info.getSSID();        }        return info.toString();   }

2.註冊 receiver監聽wifi 訊號變化：

public BroadcastReceiver rssiReceiver = new BroadcastReceiver() {        @Override        public void onReceive(Context context, Intent intent) {        }    };    @Override    public void onResume() {        super.onResume();        registerReceiver(rssiReceiver, new IntentFilter(WifiManager.RSSI_CHANGED_ACTION));                Log.d("way", "Registered");    }    @Override    public void onPause() {        super.onPause();                unregisterReceiver(rssiReceiver);        Log.d("way", "Unregistered");    }