How to get available wifi networks and display them in a list in android

Question

Friends, I want to find all available WiFi networks and display them in a list I have tried as below. But it's not working. I have edited my code, and now I got the result but with all the result that I don't need. I only need names of wifi network in my list.

public class MainActivity extends Activity {      TextView mainText;     WifiManager mainWifi;     WifiReceiver receiverWifi;     List<ScanResult> wifiList;     StringBuilder sb = new StringBuilder();      @Override     protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          mainText = (TextView) findViewById(R.id.tv1);         mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);          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);          }            receiverWifi = new WifiReceiver();          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);              }         } } 

Answer 1

You need to create a BroadcastReceiver to listen for Wifi scan results:

private final BroadcastReceiver mWifiScanReceiver = new BroadcastReceiver() {     @Override     public void onReceive(Context c, Intent intent) {         if (intent.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {             List<ScanResult> mScanResults = mWifiManager.getScanResults();             // add your logic here         }     } } 

In onCreate() you would assign mWifiManager and initiate a scan:

mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); registerReceiver(mWifiScanReceiver,         new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); mWifiManager.startScan(); 

getScanResults() will return data only if you have appropriate permissions. For this, add one of the following two lines to your AndroidManifest.xml:

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 

Also note that in API 23+, permissions must be requested at runtime. (For a lab environment, you can also grant permissions manually in Settings instead—less coding required, but not recommended for an end-user app.)

Note that the code which handles your scan results would run every time a new scan result is available, updating the result.