改编@ToonSuperLove的答案，主要是为了避免NPE。

public class WifiTest extends Activity {

public void loadWifiAvailableList(EditText etWifiList) {

WifiManager wifiManager = (WifiManager)

getSystemService(Context.WIFI_SERVICE);

List results = wifiManager.getScanResults();

String message = "No results. Check wireless is on";

if (results != null) {

final int size = results.size();

if (size == 0) message = "No access points in range";

else {

ScanResult bestSignal = results.get(0);

etWifiList.setText(""); // etWifiList is EditText

int count = 1;

for (ScanResult result : results) {

etWifiList.append(count++ + ". " + result.SSID + " : "

+ result.level + "\n" + resul