Я ищу для сканирования доступных сетей Wi-Fi, но метод getScanResults () возвращает нулевой список.
Я включил все необходимые разрешения:
android.permission.ACCESS_COARSE_LOCATION
android.permission.CHANGE_WIFI_STATE
android.permission.ACCESS_FINE_LOCATION
android.permission.ACCESS_WIFI_STATE
Основной класс деятельности:
public class Home extends Activity {`
Context context;
WifiManager wifiManager = null;
WiFiReceiver wifiReceiver = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.home);
context = this;
wifiManager = (WifiManager)
context.getSystemService(Context.WIFI_SERVICE);
wifiReceiver = new WiFiReceiver(wifiManager);
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
registerReceiver(wifiReceiver, intentFilter);
wifiManager.startScan();
List<ScanResult> results = wifiReceiver.results;
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(wifiReceiver);
}
}
Приемник вещания:
public class WiFiReceiver extends BroadcastReceiver {`
public List<ScanResult> results;
private WifiManager wifiManager;
public WiFiReceiver(WifiManager wifiManager) {
this.wifiManager = wifiManager;
}
@Override
public void onReceive(Context context, Intent intent) {
boolean success = intent.getBooleanExtra(WifiManager.EXTRA_RESULTS_UPDATED, false);
if (success) {
results = wifiManager.getScanResults();
Log.e("wiFi Manager", "Done");
} else {
Log.e("wiFi Manager", "Scan failure");
}
}
}