Android 獲取WiFi信號

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

獲取方法：
private String obtainWifiInfo() {
// Wifi的連接速度及信號強度：
WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
// WifiInfo wifiInfo = wifiManager.getConnectionInfo();
WifiInfo info = wifiManager.getConnectionInfo();
if (info.getBSSID() != null) {
// 鏈接信號強度
int strength = WifiManager.calculateSignalLevel(info.getRssi(), 5);
// 鏈接速度
int speed = info.getLinkSpeed();
// 鏈接速度單位
String units = WifiInfo.LINK_SPEED_UNITS;
// Wifi源名稱
String ssid = info.getSSID();
}
return info.toString();
}
//////////////////////////// wifi 信號變化 ：
注冊 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");

}</pre><br />