Wifi情報取得：SSID,IP Adrress,MAC Address,RSSI

package com.xxx;

import android.app.Activity;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class WifiTestActivity extends Activity {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  WifiManager manager = (WifiManager) getSystemService(WIFI_SERVICE);
  WifiInfo info = manager.getConnectionInfo();
  String[] apInfo = new String[4];
  // SSIDを取得
  apInfo[0] = String.format("SSID : %s", info.getSSID());
  // IPアドレスを取得
  int ipAdr = info.getIpAddress();
  apInfo[1] = String.format("IP Adrress : %02d.%02d.%02d.%02d",
    (ipAdr >> 0) & 0xff, (ipAdr >> 8) & 0xff, (ipAdr >> 16) & 0xff,
    (ipAdr >> 24) & 0xff);
  // MACアドレスを取得
  apInfo[2] = String.format("MAC Address : %s", info.getMacAddress());
  // 受信信号強度&信号レベルを取得
  int rssi = info.getRssi();
  int level = WifiManager.calculateSignalLevel(rssi, 5);
  apInfo[3] = String.format("RSSI : %d / Level : %d/4", rssi, level);

  ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, apInfo);

  ListView listView = (ListView) findViewById(R.id.listView1);

  listView.setAdapter(adapter);

 }
}

マニフェストファイルに追加
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>