Android - wifi 扫描

主要流程：
通过广播中获取信息

初始化、发起扫描：

mainWifi = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
receiverWifi = new WifiReceiver();
registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
mainWifi.startScan();

在广播中接收信息：

@SuppressWarnings("all")
class WifiReceiver extends BroadcastReceiver {
    public void onReceive(Context c, Intent intent) {
        sb = new StringBuilder();
        wifiList = mainWifi.getScanResults();
        for (int i = 0; i < wifiList.size(); i++) {
            sb.append(new Integer(i + 1).toString() + ".");
            ScanResult scanResult = wifiList.get(i);
            sb.append("" + scanResult.SSID);
            sb.append("\n\n");
        }
        Log.d("xiaocai", "onReceive sb:" + sb.toString());
        mainText.setText(sb);
    }
}

注销广播：

protected void onPause() {
    super.onPause();
    unregisterReceiver(receiverWifi);
}
protected void onResume() {
    super.onResume();
    registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
}

需要的权限：

log 显示：

onReceive sb:1.my3579

2.PandoraBox-5G-3D73AE

...

15.my3579

16.

17.ChinaNet-nKSm

18.FKET

19.boardroom

​
备注： 有些wifi是没有名称的（名称为空）