问题
I need to check the current connected wifi SSID on android. I checked with Nokia 6 and OnePlus 5 with respectively Oreo 8.1.0 and Oreo 8.0. Other phones with different OS version is working fine with this code. Is there anything wrong with my code?
private WifiInfo wifiInfo;
private String ssid = "";
private WifiManager wifiManager;
private boolean getWifiStatus() {
wifiManager= (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
wifiInfo = wifiManager.getConnectionInfo();
ssid = "";
ssid = wifiInfo.getSSID();
ConnectivityManager cm =
(ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean isWiFi = false;
if(activeNetwork != null){
isWiFi = activeNetwork.getType() == ConnectivityManager.TYPE_WIFI;
}
Log.d(TAG, "getWifiStatus: " + ssid);
if(ssid.contains("TripleMZim") && wifiManager.isWifiEnabled() && isWiFi ){
return true;
}
else{
return false;
}
}
permission in Manifest file:
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.INTERNET"/>
回答1:
Oreo 8.1+ devices require the coarse location runtime permission as well as location services to be turned on before being able to retrieve the connected SSID as it can infer the users location.
Further information is available here
Which relates to this
回答2:
There are different approaches how you can get the WIFI information (such as SSID) in android.
Some of them already listed here, for example WifiManager service.
But for OP question:
Is there anything wrong with my code?
No, the problem is not in your code. The main reason for the unexpected behavior, is because of the security patch of the last android releases.
Before the patch (or any device that didn't get an update), the hackers could steal sensitive information that was leaked through the wifi info.
For example the hackers could obtain the device geolocation, that should be accessible only with the Dangerous Permission LOCATION, that should be requested at runtime and can be revoked at any moment. But in the other hand - the WifiInfo is accessible only with the Normal Permission android.permission.ACCESS_WIFI_STATE which is granted at install time and cannot be revoked.
That way, hackers could bypass the permission mechanism and access the data from dangerous permission using only normal permission.
The issue was reported and tracked by CVE-2018-9489, you can read more about it here: Sensitive information expose via WIFI
So the reason why you having those problems is because now android blocks the sensitive wifi info, unless the app holds the ACCESS_COARSE_LOCATION or ACCESS_FINE_LOCATION.
So, if you request those permissions explicitly (and allowed by the user), your code should work fine.
For example:
Manifest
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
Activity
private static final int LOCATION = 1;
protected void onStart() {
super.onStart();
//Assume you want to read the SSID when the activity is started
tryToReadSSID();
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
if(grantResults[0] == PackageManager.PERMISSION_GRANTED && requestCode == LOCATION){
//User allowed the location and you can read it now
tryToReadSSID();
}
}
private void tryToReadSSID() {
//If requested permission isn't Granted yet
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
//Request permission from user
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, LOCATION);
}else{//Permission already granted
WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
if(wifiInfo.getSupplicantState() == SupplicantState.COMPLETED){
String ssid = wifiInfo.getSSID();//Here you can access your SSID
System.out.println(ssid);
}
}
}
回答3:
In Android Oreo you could use ConnectivityManager to know your wifi SSID.
Permission
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
Code to get SSID
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = cm.getActiveNetworkInfo();
if (info != null && info.isConnected()) {
String ssid = info.getExtraInfo();
Log.d(TAG, "WiFi SSID: " + ssid);
}
This is tested in Android Oreo 8.1.0. You will get SSID enclosed with double quotes.
回答4:
You need to request permission in manifest :
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
and request it in your activity :
private void grantPermm()
{
try
{
if (ContextCompat.checkSelfPermission(MainScreenActivity.this,
Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED)
{
}
else
{
ActivityCompat.requestPermissions(MainScreenActivity.this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
101);
}
}
catch (Exception xx){}
}
then use this function :
public static String getWifiName(Context context)
{
String result="";
try {
WifiManager manager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
if (manager.isWifiEnabled())
{
WifiInfo wifiInfo = manager.getConnectionInfo();
if (wifiInfo != null)
{
NetworkInfo.DetailedState state = WifiInfo.getDetailedStateOf(wifiInfo.getSupplicantState());
if (state == NetworkInfo.DetailedState.CONNECTED || state == NetworkInfo.DetailedState.OBTAINING_IPADDR)
{
result = wifiInfo.getSSID();
if(result.equalsIgnoreCase("<unknown ssid>"))
{
Toast.makeText(context,"You are connected to mobile data", Toast.LENGTH_SHORT).show();
result="";
}
return result;
}
else
{
Toast.makeText(context,"WIFI not connected", Toast.LENGTH_SHORT).show();
return "";
}
}
else
{
Toast.makeText(context,"No WIFI Information", Toast.LENGTH_SHORT).show();
return "";
}
}
else
{
Toast.makeText(context,"WIFI not enabled", Toast.LENGTH_SHORT).show();
return "";
}
}
catch (Exception xx)
{
Toast.makeText(context, xx.getMessage().toString(), Toast.LENGTH_SHORT).show();
return "";
}
}
回答5:
If you face issues even after trying the Yaswant Narayan and behelit answers, make sure you have enabled the Location/GPS in the device while trying to get the SSID. Even though, you have acquired the relevant permissions in Android Oreo and above devices, if the Location/GPS is turned off by the user, then you will get the from those devices.
回答6:
You need to ask for runtime permission of read phone state. This is included for better security.
code is as follows:-
TelephonyManager telephonyManager = (TelephonyManager) getContext()
.getSystemService(Context.TELEPHONY_SERVICE);
String IMEI ="";
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(getActivity(),
new String[]{Manifest.permission.READ_PHONE_STATE},
123);
}
int permission = ContextCompat.checkSelfPermission(getContext(),
Manifest.permission.READ_PHONE_STATE);
if(permission == PackageManager.PERMISSION_GRANTED){
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
IMEI = telephonyManager.getImei();
}
else{
IMEI = telephonyManager.getDeviceId();
}
}
回答7:
If you're targeting API 29 (Android 10) then the location permission requested must now be for ACCESS_FINE_LOCATION, not just ACCESS_COARSE_LOCATION. Most of the above sample code is fine, however some answers could be misleading in the text.
https://developer.android.com/about/versions/10/privacy/changes
来源：https://stackoverflow.com/questions/49977395/on-oreo-8-1-0-not-getting-the-correct-wifi-ssid-its-showing-unknown-ssid-t