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Can I set ssid of WiFi?

I can use the following code to get the name of Wifi, I hope to select WiFi programatically, how can I do?
It seems that wifiInfo.ssid is val , and it can't be assigned!
I set the required permission as
<!-- in AndroidManifest.xml -->
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
Then in the code
<!-- in Activity class -->
var wifiManager = mContext.applicationContext.getSystemService(WIFI_SERVICE) as WifiManager
var wifiInfo = wifiManager.connectionInfo
var name=wifiInfo.ssid
var isEnabled=wifiManager.isWifiEnabled
wifiInfo.ssid="MyNewWifi" //It cause error
BTW,
I have read the artical
How do I connect to a specific Wi-Fi network in Android programmatically?
It seems that I need to provide passsword in the above code when I reconnect the WIFI again.
In my mind, the password will be saved to configuration if I have connected to the wifi successfully, I hope that I needn't provide password in my code if I want to reconnect the WiFi again, how can I do?

You need to create a Wifi configuration like this.
String networkSSID = "testwifi";
String networkPass = "password";
WifiConfiguration conf = new WifiConfiguration();
conf.SSID = "\"" + networkSSID + "\"";
conf.preSharedKey = "\""+ networkPass +"\"";
WifiManager wifiManager =
(WifiManager)context.getSystemService(Context.WIFI_SERVICE);
wifiManager.addNetwork(conf);
List<WifiConfiguration> list = wifiManager.getConfiguredNetworks();
for( WifiConfiguration i : list ) {
if(i.SSID != null && i.SSID.equals("\"" + networkSSID + "\"")) {
wifiManager.disconnect();
wifiManager.enableNetwork(i.networkId, true);
wifiManager.reconnect();
break;
}
}
This code should work for WPA security settings.
Reference:
Another similar question link

Android, automatically connecting to wifi networks that have no internet access

I'm calling the function WifiManager.addNetwork(WifiConfiguration) to try and add an adhoc wifi network to the device's wifi configurations. But on Android M this function returns -1, I'm assuming because it doesn't have internet access. It works fine on most other devices. Below is code snippet I'm using.
WifiConfiguration wifiConfiguration = new WifiConfiguration();
wifiConfiguration.SSID = '\"' + ssid + '\"';
wifiConfiguration.hiddenSSID = false;
wifiConfiguration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
wifiManager.addNetwork(wifiConfiguration);
Any way to get around the internet connectivity check and force the network to be added?

You need to enable the network after that :
List<WifiConfiguration> list = wifiManager.getConfiguredNetworks();
for( WifiConfiguration i : list ) {
if(i.SSID != null && i.SSID.equals("\"" + ssid + "\"")) {
wifiManager.disconnect();
wifiManager.enableNetwork(i.networkId, true);
wifiManager.reconnect();
enter code here
break;
}
}

How to scan Wi-fi networks continuously until find specific one?

I just started an app that must connect automatically to an open access point called "DEVICE AP".
I'm already getting a list with wifi networks, but I don't get "DEVICE AP" until I try the scan for three times (more or less).
So, my questions is: How can I scan continuously until I find "DEVICE AP"?
And other one, is it correct to connect to my open network by this way:
private void connectDeviceAccessPoint() {
String networkSSID = "DEVICE AP";
WifiConfiguration wifiConfig = new WifiConfiguration();
wifiConfig.SSID = "\"" + networkSSID + "\"";
wifiConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
wifiManager.addNetwork(wifiConfig);
List<WifiConfiguration> list = wifiManager.getConfiguredNetworks();
for( WifiConfiguration i : list ) {
if(i.SSID != null && i.SSID.equals("\"" + networkSSID + "\"")) {
wifiManager.disconnect();
wifiManager.enableNetwork(i.networkId, true);
wifiManager.reconnect();
//Start service to send messages to device.
startService(new Intent(WifiActivity.this, SocketService.class));
doBindService();
break;
}
}
}
Thanks in advance!

Android change wifi network not working

I am trying to connect to a specific wifi network, as described here. However, while sometimes it works, most of the times it doesn't. I do not really understand why if I run the app, let's say 10 times, the device connects to my network 2 times, and the other 8 it doesn't.
In the following is the code I use in a Fragment.
WifiConfiguration wificonfiguration = new WifiConfiguration();
wificonfiguration.SSID = "\"" + networkSSID + "\"";
wificonfiguration.priority = 40;
wificonfiguration.status = WifiConfiguration.Status.ENABLED;
// WPA management
wificonfiguration.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
wificonfiguration.allowedProtocols.set(WifiConfiguration.Protocol.WPA);
wificonfiguration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
wificonfiguration.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
wificonfiguration.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
wificonfiguration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
wificonfiguration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104);
wificonfiguration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP);
wificonfiguration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
wificonfiguration.preSharedKey = "\"" + networkPass + "\"";
WifiManager wifiManager = (WifiManager) getActivity().getSystemService(Context.WIFI_SERVICE);
int networkId = wifiManager.addNetwork(wificonfiguration);
if (networkId > -1) {
boolean status = wifiManager.enableNetwork(networkId, true);
}
The network configuration is actually added to the manager and status value is true. I have run it on several devices running Lollipop. Also, the network I want to connect to does not provide internet access, so I also thought that may be a problem for what stated in the note here. Can anybody tell me if the code is ok?
Solved
The problem was solved by adding wifiManager.disconnect(); before adding the new network configuration.

You could disable all the network via below described method before adding the network. This would disable all the configured networks to auto-connect.
for (WifiConfiguration wifiConfiguration_ : wifiManager.getConfiguredNetworks()) {
wifiConfiguration_.status = WifiConfiguration.Status.DISABLED;
int returnNetworkId_ = wifiManager.updateNetwork(wifiConfiguration_);
}

How to check if password for WiFi network is correct in Android?

In my application I ask user to select WiFi network and to enter password (if needed). How can I check if password is correct?
Here is my code for connecting to WPA networks
conf = new WifiConfiguration();
conf.SSID = "\"" + networkSSID + "\"";
networkPass = input.getText().toString();
conf.preSharedKey = "\""+ networkPass +"\"";
WifiManager wifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE);
wifiManager.addNetwork(conf);
List<WifiConfiguration> list = wifiManager.getConfiguredNetworks();
if (list.size()>0)
{
for (WifiConfiguration i : list ) {
if(i.SSID != null && i.SSID.equals("\"" + networkSSID + "\"")) {
wifiManager.disconnect();
wifiManager.enableNetwork(i.networkId, true);
wifiManager.reconnect();
break;
}
}
}

two option:
1) Use BroadcastReceiver like this.You receive an intent after your success connected. But you will not get one if the password is incorrect. So my suggestion is :
2) check it out later(like after 2s) use the Handler. Because associating and connecting to a WiFi network takes time and the actual task of connecting or associating with the network is done asynchronously in the background. So just check it out later( 1s is too short and 2 second is work for me. You might try other number).