android 获取wifi信号质量强度及监控

获取方法：

private String obtainWifiInfo() {

// Wifi的连接速度及信号强度：

WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);

// WifiInfo wifiInfo = wifiManager.getConnectionInfo();

WifiInfo info = wifiManager.getConnectionInfo();

if (info.getBSSID() != null) {

// 链接信号强度

int strength = WifiManager.calculateSignalLevel(info.getRssi(), 5);

// 链接速度

int speed = info.getLinkSpeed();

// 链接速度单位

String units = WifiInfo.LINK_SPEED_UNITS;

// Wifi源名称

String ssid = info.getSSID();

}

return info.toString();

}

//////////////////////////// wifi 信号变化 ：

注册 receiver,

public BroadcastReceiver rssiReceiver = new BroadcastReceiver() {

        @Override

        public void onReceive(Context context, Intent intent) {

            // TODO Auto-generated method stub

                Log.d("Rssi", "RSSI changed");

               // wifiInfo.setText(obtainWifiInfo());

        }

    };

    @Override

    public void onResume() {

        super.onResume();

        registerReceiver(rssiReceiver, new IntentFilter(WifiManager.RSSI_CHANGED_ACTION));

        

        Log.d("Rssi", "Registered");

    }

    @Override

    public void onPause() {

        super.onPause();

        

        unregisterReceiver(rssiReceiver);

        Log.d("Rssi", "Unregistered");

    }