Change WiFi hotspot's SSID and password in Android Oreo 8.x

问题

In my Android application I'm using the following code snippet:

@RequiresApi(api = Build.VERSION_CODES.O)
private void turnOnHotspot(){
    WifiManager manager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);

    manager.startLocalOnlyHotspot(new WifiManager.LocalOnlyHotspotCallback(){

        @Override
        public void onStarted(WifiManager.LocalOnlyHotspotReservation reservation) {
            super.onStarted(reservation);
            Log.d(TAG, "Wifi Hotspot is on now");
        }

        @Override
        public void onStopped() {
            super.onStopped();
            Log.d(TAG, "onStopped: ");
        }

        @Override
        public void onFailed(int reason) {
            super.onFailed(reason);
            Log.d(TAG, "onFailed: ");
        }
    },new Handler());
}

This piece of code creates a hotspot named something like "AndroidShare_1234". For a project of mine I need to be able to set a password and SSID to this hotspot, however I can't find a way to do this. I would like to create a hotspot with an SSID like MyHotspot and a custom password.

Note that the setWifiApEnabled is not supported anymore in Android O, this is how it's done in older versions of Android. However, I still need to programmatically make a wifi hotspot with a SSID and a password. I can't figure out how to do this. Thanks in advance!

For who cares...:

For a school project I made a locker that unlocks whenever it can connect to a wireless network with certain cridentials, hence the need of setting a hotspot programmatically.

回答1:

I have only a partial solution to the problem. Hopefully, it will be sufficient for the application you are designing.

The SSID and the password are hard-coded by the android system when you start the Hotspot. By looking over at the AOSP code, I see that the same hotspot can be shared by multiple applications. The configuration for this hotspot(class name is WifiConfiguration) is also shared with all the requesting applications. This configuration is passed back to the application in the callback onStarted(LocalOnlyHotspotReservation reservation). You can get the WifiConfiguration by calling reservation.getWifiConfiguration(). You will get all the information you need from the WifiConfiguration object. So you can read the Pre-Shared Key and the access point name. But I don't think you can change them


FYI, The relevant code that sets up the wifi configuration (including the hard-coded SSID and WPA2-PSK key) is done by the following piece of code

  /**
   * Generate a temporary WPA2 based configuration for use by the local only hotspot.
   * This config is not persisted and will not be stored by the WifiApConfigStore.
   */
   public static WifiConfiguration generateLocalOnlyHotspotConfig(Context context) {
       WifiConfiguration config = new WifiConfiguration();
       config.SSID = context.getResources().getString(
              R.string.wifi_localhotspot_configure_ssid_default) + "_"
                      + getRandomIntForDefaultSsid();
       config.allowedKeyManagement.set(KeyMgmt.WPA2_PSK);
       config.networkId = WifiConfiguration.LOCAL_ONLY_NETWORK_ID;
       String randomUUID = UUID.randomUUID().toString();
       // first 12 chars from xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
       config.preSharedKey = randomUUID.substring(0, 8) + randomUUID.substring(9, 13);
       return config;
   }

来源：https://stackoverflow.com/questions/47700717/change-wifi-hotspots-ssid-and-password-in-android-oreo-8-x