wifidiscover

public class MainActivity extends Activity {

	private TextView tvStatus;
	private WifiManager wifiManager;

	private BroadcastReceiver wifibr = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			for(ScanResult r : wifiManager.getScanResults()) {
				tvStatus.append("\n" + r.SSID + "\t" + r.level + "\n");
			}
		}
	};

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tvStatus = (TextView) findViewById(R.id.tvStatus);
        wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);

        Button btnGetWifi = (Button)findViewById(R.id.btnGetWifi);
        btnGetWifi.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				wifiManager.startScan();
			}
		});

        registerReceiver(wifibr,
    		new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
    }

    @Override
    protected void onStop() {
    	super.onStop();

    	unregisterReceiver(wifibr);
    }
}