@Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_wifi_anlayzer);

    initView();

    mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
    mWifiReciever = new WifiScanReceiver();
    startScan();
  }
 protected void onResume() {
   registerReceiver(mWifiReciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
   startScan();
   super.onResume();
 }
 protected void onPause() {
   mHandler.removeMessages(MSG_SCAN);
   unregisterReceiver(mWifiReciever);
   super.onPause();
 }
 @Override
 protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
 }