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WiFi

 

WiFi:
To work with WiFi, we have a class called WifiManager, which is responsible for doing all WiFi operations.

Steps:
1) Get WifiManager object
WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
2) Turn on WiFi by checking if it is not enabled
if(wifiManager.isWifiEnabled()==false){
wifiManager.setWifiEnabled(true);
}else{
Toast.makeText(this, “Already turned on”, Toast.LENGTH_SHORT).show();
}

3) To find available networks, we need to create a local BroadcastReceiver and register it in Activity. So that, whenever a network is identified, the receiver will be automatically notified.
class WifiReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
List<ScanResult> scanResults = wifiManager.getScanResults();

String availableNetworks = “”;

for (ScanResult sr : scanResults) {
availableNetworks = availableNetworks + sr.SSID + “\n”;
}

textView.setText(availableNetworks);
}
}

To register that receiver,

WifiReceiver wifiReceiver = new WifiReceiver();

IntentFilter i = new IntentFilter();
i.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);

registerReceiver(wifiReceiver, i);

Then, we start discovering networks

wifiManager.startScan();

4) To turn Wifi Off,
if (wifiManager.isWifiEnabled()) {
wifiManager.setWifiEnabled(false);
}

 

Note:
To work with WiFi, the following permissions must be declared in manifest

<uses-permission android:name=”android.permission.ACCESS_WIFI_STATE”/>
<uses-permission android:name=”android.permission.CHANGE_WIFI_STATE”/>
<uses-permission android:name=”android.permission.ACCESS_COARSE_LOCATION”/>

 

Create an Android application to work with Wi-Fi

 

Related topics:

  1. Broad cast Receiver
  2. Bluetooth
  3. AlarmManager
  4. 2.4 vs 5ghz WiFi 802.11 bgn vs ac (dual band , gigabyte wifi routers)
  5. windows 10 wifi hotspot & wifi problems

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