Hello everyone. I am quite new in the Apps development. I have been reading so many Q&A, forums, and post from so many people around. I have a question, and I hope someone of you could kindly give me support to clarify my doubts. I would like to enable a local hotspot on a tablet (Huawei Mediapad T5 with Android 8 - Oreo). I am developing an App with different functionalities, but I realized I need to switch between my Wireless connection and to enable my Local Hotspot (One it is already saved and configured on my tablet). And I have managed to do the switch in between the networks. The big problem comes with the SSID. If I enable manually my Local Hotspot, it connects automatically with my other device (Arduino MKR 1010), but if I do it programmatically, the Hotspot that I enable, changes every single time the SSID. Is there any way set a fixed SSID with this methodology? I read in some posts that this is already hardcoded and it is not possible to do as I wish. I hope you can help me to understand it better, clarify or to find a solution. Thank you so much in advance. I post my activity code, and the Logcat with two attempts. 
The Logcat looks as next:
D/WifiManager: LocalOnlyHotspotCallbackProxy: handle message what: 0 msg: { when=-2ms what=0 obj=* ID: -2 SSID: AndroidShare_6018 PROVIDER-NAME: null BSSID: null FQDN: null PRIO: 0 HIDDEN: false
NetworkSelectionStatus NETWORK_SELECTION_ENABLED
hasEverConnected: false
KeyMgmt: WPA2_PSK Protocols:
AuthAlgorithms:
PairwiseCiphers:
GroupCiphers:
PSK: *
Enterprise config:
IP config:
IP assignment: UNASSIGNED
Proxy settings: UNASSIGNED
cuid=-1 luid=-1 lcuid=0 userApproved=USER_UNSPECIFIED noInternetAccessExpected=false roamingFailureBlackListTimeMilli: 1000
target=android.net.wifi.WifiManager$LocalOnlyHotspotCallbackProxy$1 }
================
OR
================
D/WifiManager: LocalOnlyHotspotCallbackProxy: handle message what: 0 msg: { when=0 what=0 obj=* ID: -2 SSID: AndroidShare_6787 PROVIDER-NAME: null BSSID: null FQDN: null PRIO: 0 HIDDEN: false
NetworkSelectionStatus NETWORK_SELECTION_ENABLED
hasEverConnected: false
KeyMgmt: WPA2_PSK Protocols:
AuthAlgorithms:
PairwiseCiphers:
GroupCiphers:
PSK: *
Enterprise config:
IP config:
IP assignment: UNASSIGNED
Proxy settings: UNASSIGNED
cuid=-1 luid=-1 lcuid=0 userApproved=USER_UNSPECIFIED noInternetAccessExpected=false roamingFailureBlackListTimeMilli: 1000
target=android.net.wifi.WifiManager$LocalOnlyHotspotCallbackProxy$1 }
Java:
public class WiFi extends AppCompatActivity {
private Button on_off_wifi;
private Button discover_wifi;
public TextView connectionState_tv;
private ListView peerListView;
WifiManager myWifiManager;
private WifiManager.LocalOnlyHotspotReservation mReservation;
private boolean isHotspotEnabled = false;
private final int REQUEST_ENABLE_LOCATION_SYSTEM_SETTINGS = 101;
public WifiP2pManager myWifiP2PManager;
public Context context;
WifiP2pManager.Channel myChannel;
BroadcastReceiver myReceiver;
IntentFilter myIntentFilter;
List<WifiP2pDevice> peers = new ArrayList<WifiP2pDevice>();
String[] deviceNameArray;
WifiP2pDevice[] deviceArray;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wifi);
initialize();
on_off_wifi.setOnClickListener(new View.OnClickListener() {
@RequiresApi(api = Build.VERSION_CODES.O)
@Override
public void onClick(View v) {
if(myWifiManager.isWifiEnabled()){
myWifiManager.setWifiEnabled(false);
on_off_wifi. setText("WiFi ON");
enableLocationSettings();
}else {
turnOffHotspot();
myWifiManager.setWifiEnabled(true);
on_off_wifi.setText("WiFi OFF");
}
}
});
}
@RequiresApi(api = Build.VERSION_CODES.O)
private void enableLocationSettings() {
LocationRequest mLocationRequest = new LocationRequest();
/*mLocationRequest.setInterval(10);
mLocationRequest.setSmallestDisplacement(10);
mLocationRequest.setFastestInterval(10);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);*/
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();
builder.addLocationRequest(mLocationRequest)
.setAlwaysShow(false); // Show dialog
Task<LocationSettingsResponse> task= LocationServices.getSettingsClient(this).checkLocationSettings(builder.build());
task.addOnCompleteListener(task1 -> {
try {
LocationSettingsResponse response = task1.getResult(ApiException.class);
// All location settings are satisfied. The client can initialize location
// requests here.
toggleHotspot();
} catch (ApiException exception) {
switch (exception.getStatusCode()) {
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
// Location settings are not satisfied. But could be fixed by showing the
// user a dialog.
try {
// Cast to a resolvable exception.
ResolvableApiException resolvable = (ResolvableApiException) exception;
// Show the dialog by calling startResolutionForResult(),
// and check the result in onActivityResult().
resolvable.startResolutionForResult(WiFi.this, REQUEST_ENABLE_LOCATION_SYSTEM_SETTINGS);
} catch (IntentSender.SendIntentException e) {
// Ignore the error.
} catch (ClassCastException e) {
// Ignore, should be an impossible error.
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
// Location settings are not satisfied. However, we have no way to fix the
// settings so we won't show the dialog.
break;
}
}
});
}
@RequiresApi(api = Build.VERSION_CODES.O)
private void toggleHotspot() {
if(!isHotspotEnabled){
turnOnHotspot();
}else {
turnOffHotspot();
}
}
private boolean isLocationPermissionEnable() {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.ACCESS_COARSE_LOCATION}, 2);
return false;
}
return true;
}
@RequiresApi(api = Build.VERSION_CODES.O)
private void turnOnHotspot() {
if (!isLocationPermissionEnable()) {
return;
}
WifiManager manager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
if (manager != null) {
// Don't start when it started (existed)
manager.startLocalOnlyHotspot(new WifiManager.LocalOnlyHotspotCallback() {
@Override
public void onStarted(WifiManager.LocalOnlyHotspotReservation reservation) {
super.onStarted(reservation);
System.out.println(reservation.getWifiConfiguration() + "*****************************************************");
//Log.d(TAG, "Wifi Hotspot is on now");
mReservation = reservation;
isHotspotEnabled = true;
}
@Override
public void onStopped() {
super.onStopped();
//Log.d(TAG, "onStopped: ");
isHotspotEnabled = false;
}
@Override
public void onFailed(int reason) {
super.onFailed(reason);
//Log.d(TAG, "onFailed: ");
isHotspotEnabled = false;
}
}, new Handler());
}
}
@RequiresApi(api = Build.VERSION_CODES.O)
private void turnOffHotspot() {
if (!isLocationPermissionEnable()) {
return;
}
if (mReservation != null) {
mReservation.close();
isHotspotEnabled = false;
}
}
@RequiresApi(api = Build.VERSION_CODES.O)
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
final LocationSettingsStates states = LocationSettingsStates.fromIntent(data);
switch (requestCode) {
case REQUEST_ENABLE_LOCATION_SYSTEM_SETTINGS:
switch (resultCode) {
case Activity.RESULT_OK:
// All required changes were successfully made
toggleHotspot();
Toast.makeText(WiFi.this, states.isLocationPresent() + "", Toast.LENGTH_SHORT).show();
break;
case Activity.RESULT_CANCELED:
// The user was asked to change settings, but chose not to
Toast.makeText(WiFi.this, "Canceled", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
break;
}
}
private void mylistener() {
on_off_wifi.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(myWifiManager.isWifiEnabled()){
myWifiManager.setWifiEnabled(false);
on_off_wifi. setText("WiFi ON");
}else {
myWifiManager.setWifiEnabled(true);
on_off_wifi.setText("WiFi OFF");
}
}
});
discover_wifi.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
myWifiP2PManager.discoverPeers(myChannel, new WifiP2pManager.ActionListener() {
@Override
public void onSuccess() {
connectionState_tv.setText("Discovery started");
}
@Override
public void onFailure(int reason) {
connectionState_tv.setText("Discovery starting failed");
}
});
}
});
peerListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
final WifiP2pDevice device = deviceArray[position];
WifiP2pConfig config = new WifiP2pConfig();
config.deviceAddress = device.deviceAddress;
myWifiP2PManager.connect(myChannel, config, new WifiP2pManager.ActionListener() {
@Override
public void onSuccess() {
Toast.makeText(getApplicationContext(),"Connectect to "+device.deviceName,Toast.LENGTH_SHORT).show();
}
@Override
public void onFailure(int reason) {
Toast.makeText(getApplicationContext(),"Not connectected ",Toast.LENGTH_SHORT).show();
}
});
}
});
}
private void initialize() {
on_off_wifi = (Button) findViewById(R.id.on_off);
discover_wifi = (Button) findViewById(R.id.discover);
connectionState_tv = (TextView) findViewById(R.id.connectionState);
peerListView = (ListView) findViewById(R.id.peerListView);
myWifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
myWifiP2PManager = (WifiP2pManager) getSystemService(Context.WIFI_P2P_SERVICE);
myChannel = myWifiP2PManager.initialize(this,getMainLooper(),null);
myReceiver = new recovics.htwk.recovics_exo_hand.WifiDirectBroadcastReceiver(myWifiP2PManager,myChannel, WiFi.this);
myIntentFilter = new IntentFilter();
myIntentFilter.addAction(WifiP2pManager.WIFI_P2P_STATE_CHANGED_ACTION);
myIntentFilter.addAction(WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION);
myIntentFilter.addAction(WifiP2pManager.WIFI_P2P_CONNECTION_CHANGED_ACTION);
myIntentFilter.addAction(WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);
}
WifiP2pManager.PeerListListener peerListListener = new WifiP2pManager.PeerListListener() {
@Override
public void onPeersAvailable(WifiP2pDeviceList peerlist) {
if(!peerlist.getDeviceList().equals(peers)) {
peers.clear();
peers.addAll(peerlist.getDeviceList());
deviceNameArray = new String[peerlist.getDeviceList().size()];
deviceArray = new WifiP2pDevice[peerlist.getDeviceList().size()];
int index = 0;
for (WifiP2pDevice device : peerlist.getDeviceList()){
deviceNameArray[index]=device.deviceName;
deviceArray[index]=device;
index++;
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(),android.R.layout.simple_list_item_1,deviceNameArray);
peerListView.setAdapter(adapter);
if(peers.size()==0){
Toast.makeText(getApplicationContext(),"No Devices found",Toast.LENGTH_SHORT).show();
return;
}
}
}
};
WifiP2pManager.ConnectionInfoListener connectionInfoListener = new WifiP2pManager.ConnectionInfoListener() {
@Override
public void onConnectionInfoAvailable(WifiP2pInfo info) {
final InetAddress groupOwnerAddress = info.groupOwnerAddress;
if(info.groupFormed && info.isGroupOwner){
connectionState_tv.setText("host");
}else if(info.groupFormed){
connectionState_tv.setText("Client");
}
}
};
@Override
protected void onResume() {
super.onResume();
registerReceiver(myReceiver,myIntentFilter);
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(myReceiver);
}
}The Logcat looks as next:
D/WifiManager: LocalOnlyHotspotCallbackProxy: handle message what: 0 msg: { when=-2ms what=0 obj=* ID: -2 SSID: AndroidShare_6018 PROVIDER-NAME: null BSSID: null FQDN: null PRIO: 0 HIDDEN: false
NetworkSelectionStatus NETWORK_SELECTION_ENABLED
hasEverConnected: false
KeyMgmt: WPA2_PSK Protocols:
AuthAlgorithms:
PairwiseCiphers:
GroupCiphers:
PSK: *
Enterprise config:
IP config:
IP assignment: UNASSIGNED
Proxy settings: UNASSIGNED
cuid=-1 luid=-1 lcuid=0 userApproved=USER_UNSPECIFIED noInternetAccessExpected=false roamingFailureBlackListTimeMilli: 1000
target=android.net.wifi.WifiManager$LocalOnlyHotspotCallbackProxy$1 }
================
OR
================
D/WifiManager: LocalOnlyHotspotCallbackProxy: handle message what: 0 msg: { when=0 what=0 obj=* ID: -2 SSID: AndroidShare_6787 PROVIDER-NAME: null BSSID: null FQDN: null PRIO: 0 HIDDEN: false
NetworkSelectionStatus NETWORK_SELECTION_ENABLED
hasEverConnected: false
KeyMgmt: WPA2_PSK Protocols:
AuthAlgorithms:
PairwiseCiphers:
GroupCiphers:
PSK: *
Enterprise config:
IP config:
IP assignment: UNASSIGNED
Proxy settings: UNASSIGNED
cuid=-1 luid=-1 lcuid=0 userApproved=USER_UNSPECIFIED noInternetAccessExpected=false roamingFailureBlackListTimeMilli: 1000
target=android.net.wifi.WifiManager$LocalOnlyHotspotCallbackProxy$1 }
