在Android Oreo 8.x中更改WiFi热点的SSID和密码

Question

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.

Answer 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;
   }