I want to connect to a SSID wifi network in app.
Code:
WifiConfiguration conf = new WifiConfiguration();
conf.SSID = "\"" + networkSSID + "\"";
But the problem is that I don't know the network SSID. How to get SSID of a WiFi Network without connecting to it?
If you want to get all available wifi :
List<ScanResult> mScanResults = mWifiManager.getScanResults();
If you want to connected wifi ssid :
WifiManager wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
Log.d("wifiInfo", wifiInfo.toString());
Log.d("SSID",wifiInfo.getSSID());
If you want to add new wifi settings i have written demo app below :
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
connectToAP("12345", "12345");
WifiConfiguration wifiConf = null;
WifiManager wifiManager = (WifiManager) getSystemService(MainActivity.WIFI_SERVICE);
WifiInfo connectionInfo = wifiManager.getConnectionInfo();
List<WifiConfiguration> configuredNetworks = wifiManager
.getConfiguredNetworks();
for (WifiConfiguration conf : configuredNetworks) {
if (conf.networkId == 13) {
wifiConf = conf;
try {
setIpAssignment("STATIC", wifiConf); // or "DHCP" for
// dynamic setting
setIpAddress(InetAddress.getByName("192.168.0.100"), 24,
wifiConf);
setGateway(InetAddress.getByName("4.4.4.4"), wifiConf);
setDNS(InetAddress.getByName("4.4.4.4"), wifiConf);
wifiManager.updateNetwork(wifiConf); // apply the setting
wifiManager.saveConfiguration(); // Save it
} catch (Exception e) {
e.printStackTrace();
}
break;
}
}
}
public static void setIpAssignment(String assign, WifiConfiguration wifiConf)
throws SecurityException, IllegalArgumentException,
NoSuchFieldException, IllegalAccessException {
setEnumField(wifiConf, assign, "ipAssignment");
}
public static void setEnumField(Object obj, String value, String name)
throws SecurityException, NoSuchFieldException,
IllegalArgumentException, IllegalAccessException {
Field f = obj.getClass().getField(name);
f.set(obj, Enum.valueOf((Class<Enum>) f.getType(), value));
}
public static void setIpAddress(InetAddress addr, int prefixLength,
WifiConfiguration wifiConf) throws SecurityException,
IllegalArgumentException, NoSuchFieldException,
IllegalAccessException, NoSuchMethodException,
ClassNotFoundException, InstantiationException,
InvocationTargetException {
Object linkProperties = getField(wifiConf, "linkProperties");
if (linkProperties == null)
return;
Class laClass = Class.forName("android.net.LinkAddress");
Constructor laConstructor = laClass.getConstructor(new Class[] {
InetAddress.class, int.class });
Object linkAddress = laConstructor.newInstance(addr, prefixLength);
ArrayList mLinkAddresses = (ArrayList) getDeclaredField(linkProperties,
"mLinkAddresses");
mLinkAddresses.clear();
mLinkAddresses.add(linkAddress);
}
public static void setGateway(InetAddress gateway,
WifiConfiguration wifiConf) throws SecurityException,
IllegalArgumentException, NoSuchFieldException,
IllegalAccessException, ClassNotFoundException,
NoSuchMethodException, InstantiationException,
InvocationTargetException {
Object linkProperties = getField(wifiConf, "linkProperties");
if (linkProperties == null)
return;
Class routeInfoClass = Class.forName("android.net.RouteInfo");
Constructor routeInfoConstructor = routeInfoClass
.getConstructor(new Class[] { InetAddress.class });
Object routeInfo = routeInfoConstructor.newInstance(gateway);
ArrayList mRoutes = (ArrayList) getDeclaredField(linkProperties,
"mRoutes");
mRoutes.clear();
mRoutes.add(routeInfo);
}
public static void setDNS(InetAddress dns, WifiConfiguration wifiConf)
throws SecurityException, IllegalArgumentException,
NoSuchFieldException, IllegalAccessException {
Object linkProperties = getField(wifiConf, "linkProperties");
if (linkProperties == null)
return;
ArrayList<InetAddress> mDnses = (ArrayList<InetAddress>) getDeclaredField(
linkProperties, "mDnses");
mDnses.clear(); // or add a new dns address , here I just want to
// replace DNS1
mDnses.add(dns);
}
public static Object getField(Object obj, String name)
throws SecurityException, NoSuchFieldException,
IllegalArgumentException, IllegalAccessException {
Field f = obj.getClass().getField(name);
Object out = f.get(obj);
return out;
}
public static Object getDeclaredField(Object obj, String name)
throws SecurityException, NoSuchFieldException,
IllegalArgumentException, IllegalAccessException {
Field f = obj.getClass().getDeclaredField(name);
f.setAccessible(true);
Object out = f.get(obj);
return out;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
String TAG = "wifi";
WifiManager wifiManager;
public void connectToAP(String ssid, String passkey) {
Log.i(TAG, "* connectToAP");
wifiManager = (WifiManager) getSystemService(WIFI_SERVICE);
WifiConfiguration wifiConfiguration = new WifiConfiguration();
String networkSSID = ssid;
String networkPass = passkey;
Log.d(TAG, "# password " + networkPass);
// for (ScanResult result : scanResultList) {
// if (result.SSID.equals(networkSSID)) {
if (true) {
// String securityMode = getScanResultSecurity(result);
String securityMode = "WEP";
if (securityMode.equalsIgnoreCase("OPEN")) {
wifiConfiguration.SSID = "\"" + networkSSID + "\"";
wifiConfiguration.allowedKeyManagement
.set(WifiConfiguration.KeyMgmt.NONE);
int res = wifiManager.addNetwork(wifiConfiguration);
Log.d(TAG, "# add Network returned " + res);
boolean b = wifiManager.enableNetwork(res, true);
Log.d(TAG, "# enableNetwork returned " + b);
wifiManager.setWifiEnabled(true);
} else if (securityMode.equalsIgnoreCase("WEP")) {
wifiConfiguration.SSID = "\"" + networkSSID + "\"";
wifiConfiguration.wepKeys[0] = "\"" + networkPass + "\"";
wifiConfiguration.wepTxKeyIndex = 0;
wifiConfiguration.allowedKeyManagement
.set(WifiConfiguration.KeyMgmt.NONE);
wifiConfiguration.allowedGroupCiphers
.set(WifiConfiguration.GroupCipher.WEP40);
int res = wifiManager.addNetwork(wifiConfiguration);
Log.d(TAG, "### 1 ### add Network returned " + res);
boolean b = wifiManager.enableNetwork(res, true);
Log.d(TAG, "# enableNetwork returned " + b);
wifiManager.setWifiEnabled(true);
}
wifiConfiguration.SSID = "\"" + networkSSID + "\"";
wifiConfiguration.preSharedKey = "\"" + networkPass + "\"";
wifiConfiguration.hiddenSSID = true;
wifiConfiguration.status = WifiConfiguration.Status.ENABLED;
wifiConfiguration.allowedGroupCiphers
.set(WifiConfiguration.GroupCipher.TKIP);
wifiConfiguration.allowedGroupCiphers
.set(WifiConfiguration.GroupCipher.CCMP);
wifiConfiguration.allowedKeyManagement
.set(WifiConfiguration.KeyMgmt.WPA_PSK);
wifiConfiguration.allowedPairwiseCiphers
.set(WifiConfiguration.PairwiseCipher.TKIP);
wifiConfiguration.allowedPairwiseCiphers
.set(WifiConfiguration.PairwiseCipher.CCMP);
wifiConfiguration.allowedProtocols
.set(WifiConfiguration.Protocol.RSN);
wifiConfiguration.allowedProtocols
.set(WifiConfiguration.Protocol.WPA);
int res = wifiManager.addNetwork(wifiConfiguration);
Log.d(TAG, "### 2 ### add Network returned " + res);
wifiManager.enableNetwork(res, true);
boolean changeHappen = wifiManager.saveConfiguration();
if (res != -1 && changeHappen) {
Log.d(TAG, "### Change happen");
// AppStaticVar.connectedSsidName = networkSSID;
} else {
Log.d(TAG, "*** Change NOT happen");
}
wifiManager.setWifiEnabled(true);
}
// }
}
public String getScanResultSecurity(ScanResult scanResult) {
Log.i(TAG, "* getScanResultSecurity");
final String cap = scanResult.capabilities;
final String[] securityModes = { "WEP", "PSK", "EAP" };
for (int i = securityModes.length - 1; i >= 0; i--) {
if (cap.contains(securityModes[i])) {
return securityModes[i];
}
}
return "OPEN";
}
}
Use WifiManager#getScanResults(). This gets you a list of ScanResult objects each of which provides an SSID property.
来源：https://stackoverflow.com/questions/25286604/get-wifis-ssid-without-connecting-to-it