не работает getScanResults()

[Dmitriy17]

телефон samsung, версия android 6.0.1
results = wifi.getScanResults();
size = results.size();
size всегда = 0 !?
на телефоне Wifi включен, и есть подключение к роутеру
разрешения добавлены в манифест..
почему то не отрабатывает getScanResults();
где искать? как решить проблемку ?

[Dmitriy17]

import java.util.List;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

TextView mainText;
WifiManager mainWifi;
WifiReceiver receiverWifi;
List<ScanResult> wifiList;
StringBuilder sb = new StringBuilder();

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);
mainText = (TextView) findViewById(R.id.mainText);

// Initiate wifi service manager
mainWifi = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

// Check for wifi is disabled
if (mainWifi.isWifiEnabled() == false)
{
// If wifi disabled then enable it
Toast.makeText(getApplicationContext(), "wifi is disabled..making it enabled",
Toast.LENGTH_LONG).show();

mainWifi.setWifiEnabled(true);
}

// wifi scaned value broadcast receiver
receiverWifi = new WifiReceiver();

// Register broadcast receiver
// Broacast receiver will automatically call when number of wifi connections changed
registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
mainWifi.startScan();
mainText.setText("Starting Scan...");
}

public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, 0, 0, "Refresh");
return super.onCreateOptionsMenu(menu);
}

public boolean onMenuItemSelected(int featureId, MenuItem item) {
mainWifi.startScan();
mainText.setText("Starting Scan");
return super.onMenuItemSelected(featureId, item);
}

protected void onPause() {
unregisterReceiver(receiverWifi);
super.onPause();
}

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

// Broadcast receiver class called its receive method
// when number of wifi connections changed

class WifiReceiver extends BroadcastReceiver {

// This method call when number of wifi connections changed
public void onReceive(Context c, Intent intent) {

sb = new StringBuilder();
wifiList = mainWifi.getScanResults();
sb.append("\n Number Of Wifi connections :"+wifiList.size()+"\n\n");

for(int i = 0; i < wifiList.size(); i++){

sb.append(new Integer(i+1).toString() + ". ");
sb.append((wifiList.get(i)).toString());
sb.append("\n\n");
}

mainText.setText(sb);
}

}
}