I need to detect when I have network connectivity to a SPECIFIC WIFI network.
For example: As soon as you walk into your house, and your phone picks up your home WiFi network, I would like a notification that says "You are not at your home network, would you like to connect to you Home?" But I would like that to only happen when I am at my specific house.
What should I listen for and what tests should I do to make sure it is my specific home network, and not another network?
You can use BroadcastReceiver to find out that wifi network has changed:
BroadcastReceiver broadcastReceiver = new WifiBroadcastReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
context.registerReceiver(broadcastReceiver, intentFilter);
The BroadcastReceiver may look like this. And to check for specific MAC address see the checkConnectedToDesiredWifi() method bellow.
public class WifiBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (WifiManager.SUPPLICANT_STATE_CHANGED_ACTION .equals(action)) {
SupplicantState state = intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE);
if (SupplicantState.isValidState(state)
&& state == SupplicantState.COMPLETED) {
boolean connected = checkConnectedToDesiredWifi();
}
}
}
/** Detect you are connected to a specific network. */
private boolean checkConnectedToDesiredWifi() {
boolean connected = false;
String desiredMacAddress = "router mac address";
WifiManager wifiManager =
(WifiManager) context.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifi = wifiManager.getConnectionInfo();
if (wifi != null) {
// get current router Mac address
String bssid = wifi.getBSSID();
connected = desiredMacAddress.equals(bssid);
}
return connected;
}
}
As long, as we are nothing like code as you need, for free service, I can only recommend you, to read everything possible about Android and its Network/Wifi possibilities, when creating such app.
http://developer.android.com/reference/android/net/wifi/package-summary.html
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AndroidManifest.xml
<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_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
(the last one, only if you want it to detect your location, to prevent unnecessary calls)
AndroidManifest.xml
<uses-feature android:name="android.hardware.wifi" />
I had exactly the same problem for a project of mine and it took a while to find a solution.
First of all, "connecting to a WiFi" is something very abstract, and it turns out rightly so. In practice, people usually mean all of the following:
All these stages (and several more) are associated with different Andoid events. So, without further ado, here is my (slightly modified) code:
public class MyService extends Activity { // or Service
//... Other stuff
BroadcastReceiver awaitIPAddress = null;
private final BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION)) {
if (intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE) == SupplicantState.COMPLETED) {
//WiFi is associated
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo wi = wifiManager.getConnectionInfo();
if (wi != null) {
// Wifi info available (should be, we are associated)
if (wi.getIpAddress() != 0) {
// Lucky us, we already have an ip address.
// This happens when a connection is complete, e.g. after rekeying
if (wi.getBSSID().equals("c0:ff:ee:c0:ff:ee")) {
// ... Do your stuff here
// ...
// ...
}
} else {
// No ip address yet, we need to wait...
// Battery friendly method, using events
if (awaitIPAddress == null) {
awaitIPAddress = new BroadcastReceiver() {
@Override
public void onReceive(Context ctx, Intent in) {
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo wi = wifiManager.getConnectionInfo();
if (wi != null) {
if (wi.getIpAddress() != 0) {
if (wi.getBSSID().equals("c0:ff:ee:c0:ff:ee")) {
// ... Do your stuff here
// ...
// ...
}
}
} else {
ctx.unregisterReceiver(this);
awaitIPAddress = null;
}
}
};
// We register a new receiver for connectivity events
// (getting a new IP address for example)
context.registerReceiver(awaitIPAddress, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}
}
}
} else {
// wifi connection not complete, release ip address receiver if registered
if (awaitIPAddress != null) {
context.unregisterReceiver(awaitIPAddress);
awaitIPAddress = null;
}
}
}
}
};
//... Other stuff
@Override
public void onCreate() {
super.onCreate();
//... Other stuff
IntentFilter filter = new IntentFilter();
filter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
registerReceiver(receiver, filter);
//... Other stuff
}
//... Other stuff
}
Also, don't neglect the appropriate permissions to the manifest:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
And I strongly suspect you will also need:
<uses-permission android:name="android.permission.INTERNET"/>
Use the standard code to list all available networks:
start the scan
String connectivity_context = Context.WIFI_SERVICE;
final WifiManager wifi = (WifiManager) getSystemService(connectivity_context);
if (wifi.isWifiEnabled()) {
wifi.startScan();
}
register a receiver for the data
IntentFilter i = new IntentFilter();
i.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION);
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent i) {
// TODO Auto-generated method stub
ScanWiFiActivity a = ScanWiFiActivity.instance();
WifiManager w = (WifiManager) context
.getSystemService(Context.WIFI_SERVICE);
List<ScanResult> l = w.getScanResults();
a.Clear();
for (ScanResult r : l) {
//use r.SSID or r.BSSID to identify your home network and take action
a.setText(r.SSID + "" + r.level + "\r\n");
}
}
};
registerReceiver(receiver, i);
In the FOR block work your magic and take action when you identify your network by SSID or BSSID
