问题
As in Android Q, several WiFi APIs are restricted. I am trying to use alternate APIs to connect to different Wifi AP for internet.
Below is my code :
WifiNetworkSpecifier.Builder builder = new WifiNetworkSpecifier.Builder();
builder.setSsid("wifi-ap-ssid");
builder.setWpa2Passphrase("wifi-ap-password");
WifiNetworkSpecifier wifiNetworkSpecifier = builder.build();
NetworkRequest.Builder networkRequestBuilder1 = new NetworkRequest.Builder();
networkRequestBuilder1.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
networkRequestBuilder1.setNetworkSpecifier(wifiNetworkSpecifier);
NetworkRequest nr = networkRequestBuilder1.build();
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
cm.requestNetwork(nr, callback);
This allows me to connect but Internet is disabled. This is working as defined in Android docs.
Alternate way i tried is below :
WifiNetworkSuggestion.Builder wifiNetworkSuggestionBuilder1 = new WifiNetworkSuggestion.Builder();
wifiNetworkSuggestionBuilder1.setSsid("wifi-ap-ssid");
wifiNetworkSuggestionBuilder1.setWpa2Passphrase("wifi-ap-password");
WifiNetworkSuggestion wifiNetworkSuggestion = wifiNetworkSuggestionBuilder1.build();
List<WifiNetworkSuggestion> list = new ArrayList<>();
list.add(wifiNetworkSuggestion);
wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
wifiManager.removeNetworkSuggestions(new ArrayList<WifiNetworkSuggestion>());
wifiManager.addNetworkSuggestions(list);
declared permission in Manifest :
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
Using this didn't change anything in behavior.
Please let know sequence of APIs to connect successfully to different Wifi AP with internet capability.
回答1:
WifiNetworkSuggestion API is used to suggest the user about joining an AP(System will post a notification for user to join)
Use WifiNetworkSpecifier to send your requests. Use the network object provided in onAvailable().
WifiNetworkSpecifier.Builder builder = new WifiNetworkSpecifier.Builder();
builder.setSsid("wifi-ap-ssid");
builder.setWpa2Passphrase("wifi-ap-password");
WifiNetworkSpecifier wifiNetworkSpecifier = builder.build();
NetworkRequest.Builder networkRequestBuilder = new NetworkRequest.Builder();
networkRequestBuilder1.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
networkRequestBuilder1.setNetworkSpecifier(wifiNetworkSpecifier);
NetworkRequest networkRequest = networkRequestBuilder.build();
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
cm.requestNetwork(networkRequest, networkCallback);
networkCallback = new ConnectivityManager.NetworkCallback() {
@Override
public void onAvailable(@NonNull Network network) {
//Use this network object to Send request.
//eg - Using OkHttp library to create a service request
//Service is an OkHttp interface where we define docs. Please read OkHttp docs
Service service = null;
OkHttpClient.Builder okHttpBuilder = new OkHttpClient.Builder();
okHttpBuilder.socketFactory(network.getSocketFactory());
service = new Retrofit.Builder() .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.addConverterFactory(GsonConverterFactory.create(gson))
.client(okHttpBuilder.build())
.build()
.create(Service.class);
Observable<Object> observable = null;
try {
if (service != null) {
observable = service.yourRestCall();
}
Subscriber<Object> sub = new Subscriber< Object >() {
@Override
public void onError(Throwable e) {
//Do on error
}
@Override
public void onNext(Object logs) {
//Do on next
}
};
if(observable != null) {
observable.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread()).subscribe(sub);
}
super.onAvailable(network);
}
};
After you are done using the Wifi access point do
connectivityManager.unregisterNetworkCallback(networkCallback);
From Google's Issue tracker by Google's Engineer:
The network suggestions API flow requires the user to approve the app (platform posts a notification to ask user for approval). Once the app is approved, the platform will consider all networks from the app in future auto-connection attempts. But, this API does not give you guarantees on when the device will connect to your AP for provisioning. So, WifiNetworkSuggestion is not the right API surface for the provided use-case (peer to peer instant connectivity).
Using WifiNetworkSpecifier establishes a local connection to the wifi access point as mentioned above. The default network will still be cellular in this case (we don't disrupt other app's internet connectivity). The app making the request should use the multi-network API's to route their traffic over the established connection. The |Network| object provided in the onAvailable() callback for the request is the handle that app needs to use for opening sockets over that local network (Look at https://developer.android.com/reference/android/net/Network.html#bindSocket(java.net.DatagramSocket) and other such API's available in the |Network| object surface.
Hope this helps.
回答2:
Try calling bindProcessToNetwork() in onAvailable() callback to regain network connectivity, it works fine for me.
Connect to network:
WifiNetworkSpecifier.Builder builder = new WifiNetworkSpecifier.Builder();
builder.setSsid("wifi-ap-ssid");
builder.setWpa2Passphrase("wifi-ap-password");
WifiNetworkSpecifier wifiNetworkSpecifier = builder.build();
NetworkRequest.Builder networkRequestBuilder1 = new NetworkRequest.Builder();
networkRequestBuilder1.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
networkRequestBuilder1.setNetworkSpecifier(wifiNetworkSpecifier);
NetworkRequest nr = networkRequestBuilder1.build();
ConnectivityManager cm = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
ConnectivityManager.NetworkCallback networkCallback = new
ConnectivityManager.NetworkCallback() {
@Override
public void onAvailable(Network network) {
super.onAvailable(network);
Log.d(TAG, "onAvailable:" + network);
cm.bindProcessToNetwork(network);
}
});
cm.requestNetwork(nr, networkCallback);
Disconnect from the bound network:
cm.unregisterNetworkCallback(networkCallback);
回答3:
You should use Wi-Fi network suggestion API in Q
final WifiNetworkSuggestion suggestion1 =
new WifiNetworkSuggestion.Builder()
.setSsid("test111111")
.setIsAppInteractionRequired() // Optional (Needs location permission)
.build()
final WifiNetworkSuggestion suggestion2 =
new WifiNetworkSuggestion.Builder()
.setSsid("test222222")
.setWpa2Passphrase("test123456")
.setIsAppInteractionRequired() // Optional (Needs location permission)
.build()
final WifiNetworkSuggestion suggestion3 =
new WifiNetworkSuggestion.Builder()
.setSsid("test333333")
.setWpa3Passphrase("test6789")
.setIsAppInteractionRequired() // Optional (Needs location permission)
.build()
final List<WifiNetworkSuggestion> suggestionsList =
new ArrayList<WifiNetworkSuggestion> {{
add(suggestion1);
add(suggestion2);
add(suggestion3);
}};
final WifiManager wifiManager =
(WifiManager) context.getSystemService(Context.WIFI_SERVICE);
final int status = wifiManager.addNetworkSuggestions(suggestionsList);
if (status != WifiManager.STATUS_NETWORK_SUGGESTIONS_SUCCESS) {
// do error handling here…
}
// Optional (Wait for post connection broadcast to one of your suggestions)
final IntentFilter intentFilter =
new IntentFilter(WifiManager.ACTION_WIFI_NETWORK_SUGGESTION_POST_CONNECTION);
final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (!intent.getAction().equals(
WifiManager.ACTION_WIFI_NETWORK_SUGGESTION_POST_CONNECTION)) {
return;
}
// do post connect processing here..
}
};
context.registerReceiver(broadcastReceiver, intentFilter);
来源：https://stackoverflow.com/questions/56831023/android-q-programmatically-connect-to-different-wifi-ap-for-internet