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1 /*
2  * Copyright (C) 2008 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.settings;
18 
19 import static android.net.ConnectivityManager.TETHERING_BLUETOOTH;
20 import static android.net.ConnectivityManager.TETHERING_USB;
21 import static android.net.TetheringManager.TETHERING_ETHERNET;
22 
23 import android.app.Activity;
24 import android.app.settings.SettingsEnums;
25 import android.bluetooth.BluetoothAdapter;
26 import android.bluetooth.BluetoothPan;
27 import android.bluetooth.BluetoothProfile;
28 import android.content.BroadcastReceiver;
29 import android.content.Context;
30 import android.content.Intent;
31 import android.content.IntentFilter;
32 import android.hardware.usb.UsbManager;
33 import android.net.ConnectivityManager;
34 import android.net.EthernetManager;
35 import android.net.TetheringManager;
36 import android.net.wifi.WifiManager;
37 import android.os.Bundle;
38 import android.os.Environment;
39 import android.os.Handler;
40 import android.os.HandlerExecutor;
41 import android.os.UserManager;
42 import android.provider.SearchIndexableResource;
43 import android.text.TextUtils;
44 import android.util.FeatureFlagUtils;
45 
46 import androidx.annotation.VisibleForTesting;
47 import androidx.preference.Preference;
48 import androidx.preference.SwitchPreference;
49 
50 import com.android.settings.core.FeatureFlags;
51 import com.android.settings.datausage.DataSaverBackend;
52 import com.android.settings.search.BaseSearchIndexProvider;
53 import com.android.settings.wifi.tether.WifiTetherPreferenceController;
54 import com.android.settingslib.TetherUtil;
55 import com.android.settingslib.search.SearchIndexable;
56 
57 import java.lang.ref.WeakReference;
58 import java.util.ArrayList;
59 import java.util.Arrays;
60 import java.util.List;
61 import java.util.concurrent.atomic.AtomicReference;
62 
63 /*
64  * Displays preferences for Tethering.
65  */
66 @SearchIndexable
67 public class TetherSettings extends RestrictedSettingsFragment
68         implements DataSaverBackend.Listener {
69 
70     @VisibleForTesting
71     static final String KEY_TETHER_PREFS_SCREEN = "tether_prefs_screen";
72     @VisibleForTesting
73     static final String KEY_WIFI_TETHER = "wifi_tether";
74     @VisibleForTesting
75     static final String KEY_USB_TETHER_SETTINGS = "usb_tether_settings";
76     @VisibleForTesting
77     static final String KEY_ENABLE_BLUETOOTH_TETHERING = "enable_bluetooth_tethering";
78     private static final String KEY_ENABLE_ETHERNET_TETHERING = "enable_ethernet_tethering";
79     private static final String KEY_DATA_SAVER_FOOTER = "disabled_on_data_saver";
80     @VisibleForTesting
81     static final String KEY_TETHER_PREFS_FOOTER = "tether_prefs_footer";
82 
83     @VisibleForTesting
84     static final String BLUETOOTH_TETHERING_STATE_CHANGED =
85             "android.bluetooth.pan.profile.action.TETHERING_STATE_CHANGED";
86 
87     private static final String TAG = "TetheringSettings";
88 
89     private SwitchPreference mUsbTether;
90 
91     private SwitchPreference mBluetoothTether;
92 
93     private SwitchPreference mEthernetTether;
94 
95     private BroadcastReceiver mTetherChangeReceiver;
96 
97     private String[] mUsbRegexs;
98     private String[] mBluetoothRegexs;
99     private String mEthernetRegex;
100     private AtomicReference<BluetoothPan> mBluetoothPan = new AtomicReference<>();
101 
102     private Handler mHandler = new Handler();
103     private OnStartTetheringCallback mStartTetheringCallback;
104     private ConnectivityManager mCm;
105     private EthernetManager mEm;
106     private TetheringManager mTm;
107     private TetheringEventCallback mTetheringEventCallback;
108     private EthernetListener mEthernetListener;
109 
110     private WifiTetherPreferenceController mWifiTetherPreferenceController;
111 
112     private boolean mUsbConnected;
113     private boolean mMassStorageActive;
114 
115     private boolean mBluetoothEnableForTether;
116     private boolean mUnavailable;
117 
118     private DataSaverBackend mDataSaverBackend;
119     private boolean mDataSaverEnabled;
120     private Preference mDataSaverFooter;
121 
122     @Override
getMetricsCategory()123     public int getMetricsCategory() {
124         return SettingsEnums.TETHER;
125     }
126 
TetherSettings()127     public TetherSettings() {
128         super(UserManager.DISALLOW_CONFIG_TETHERING);
129     }
130 
131     @Override
onAttach(Context context)132     public void onAttach(Context context) {
133         super.onAttach(context);
134         mWifiTetherPreferenceController =
135                 new WifiTetherPreferenceController(context, getSettingsLifecycle());
136     }
137 
138     @Override
onCreate(Bundle icicle)139     public void onCreate(Bundle icicle) {
140         super.onCreate(icicle);
141 
142         addPreferencesFromResource(R.xml.tether_prefs);
143         mDataSaverBackend = new DataSaverBackend(getContext());
144         mDataSaverEnabled = mDataSaverBackend.isDataSaverEnabled();
145         mDataSaverFooter = findPreference(KEY_DATA_SAVER_FOOTER);
146 
147         setIfOnlyAvailableForAdmins(true);
148         if (isUiRestricted()) {
149             mUnavailable = true;
150             getPreferenceScreen().removeAll();
151             return;
152         }
153 
154         final Activity activity = getActivity();
155         BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
156         if (adapter != null) {
157             adapter.getProfileProxy(activity.getApplicationContext(), mProfileServiceListener,
158                     BluetoothProfile.PAN);
159         }
160 
161         setupTetherPreference();
162         setFooterPreferenceTitle();
163 
164         mDataSaverBackend.addListener(this);
165 
166         mCm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
167         mEm = (EthernetManager) getSystemService(Context.ETHERNET_SERVICE);
168         mTm = (TetheringManager) getSystemService(Context.TETHERING_SERVICE);
169 
170         mUsbRegexs = mCm.getTetherableUsbRegexs();
171         mBluetoothRegexs = mCm.getTetherableBluetoothRegexs();
172         mEthernetRegex = getContext().getResources().getString(
173                 com.android.internal.R.string.config_ethernet_iface_regex);
174 
175         final boolean usbAvailable = mUsbRegexs.length != 0;
176         final boolean bluetoothAvailable = adapter != null && mBluetoothRegexs.length != 0;
177         final boolean ethernetAvailable = !TextUtils.isEmpty(mEthernetRegex);
178 
179         if (!usbAvailable || Utils.isMonkeyRunning()) {
180             getPreferenceScreen().removePreference(mUsbTether);
181         }
182 
183         mWifiTetherPreferenceController.displayPreference(getPreferenceScreen());
184 
185         if (!bluetoothAvailable) {
186             getPreferenceScreen().removePreference(mBluetoothTether);
187         } else {
188             BluetoothPan pan = mBluetoothPan.get();
189             if (pan != null && pan.isTetheringOn()) {
190                 mBluetoothTether.setChecked(true);
191             } else {
192                 mBluetoothTether.setChecked(false);
193             }
194         }
195         if (!ethernetAvailable) getPreferenceScreen().removePreference(mEthernetTether);
196         // Set initial state based on Data Saver mode.
197         onDataSaverChanged(mDataSaverBackend.isDataSaverEnabled());
198     }
199 
200     @Override
onDestroy()201     public void onDestroy() {
202         mDataSaverBackend.remListener(this);
203 
204         BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
205         BluetoothProfile profile = mBluetoothPan.getAndSet(null);
206         if (profile != null && adapter != null) {
207             adapter.closeProfileProxy(BluetoothProfile.PAN, profile);
208         }
209 
210         super.onDestroy();
211     }
212 
213     @VisibleForTesting
setupTetherPreference()214     void setupTetherPreference() {
215         mUsbTether = (SwitchPreference) findPreference(KEY_USB_TETHER_SETTINGS);
216         mBluetoothTether = (SwitchPreference) findPreference(KEY_ENABLE_BLUETOOTH_TETHERING);
217         mEthernetTether = (SwitchPreference) findPreference(KEY_ENABLE_ETHERNET_TETHERING);
218     }
219 
220     @Override
onDataSaverChanged(boolean isDataSaving)221     public void onDataSaverChanged(boolean isDataSaving) {
222         mDataSaverEnabled = isDataSaving;
223         mUsbTether.setEnabled(!mDataSaverEnabled);
224         mBluetoothTether.setEnabled(!mDataSaverEnabled);
225         mEthernetTether.setEnabled(!mDataSaverEnabled);
226         mDataSaverFooter.setVisible(mDataSaverEnabled);
227     }
228 
229     @Override
onWhitelistStatusChanged(int uid, boolean isWhitelisted)230     public void onWhitelistStatusChanged(int uid, boolean isWhitelisted) {
231     }
232 
233     @Override
onBlacklistStatusChanged(int uid, boolean isBlacklisted)234     public void onBlacklistStatusChanged(int uid, boolean isBlacklisted)  {
235     }
236 
237     @VisibleForTesting
setFooterPreferenceTitle()238     void setFooterPreferenceTitle() {
239         final Preference footerPreference = findPreference(KEY_TETHER_PREFS_FOOTER);
240         final WifiManager wifiManager =
241                 (WifiManager) getContext().getSystemService(Context.WIFI_SERVICE);
242         if (wifiManager.isStaApConcurrencySupported()) {
243             footerPreference.setTitle(R.string.tethering_footer_info_sta_ap_concurrency);
244         } else {
245             footerPreference.setTitle(R.string.tethering_footer_info);
246         }
247     }
248 
249     private class TetherChangeReceiver extends BroadcastReceiver {
250         @Override
onReceive(Context content, Intent intent)251         public void onReceive(Context content, Intent intent) {
252             String action = intent.getAction();
253             // TODO: stop using ACTION_TETHER_STATE_CHANGED and use mTetheringEventCallback instead.
254             if (action.equals(ConnectivityManager.ACTION_TETHER_STATE_CHANGED)) {
255                 // TODO - this should understand the interface types
256                 ArrayList<String> available = intent.getStringArrayListExtra(
257                         ConnectivityManager.EXTRA_AVAILABLE_TETHER);
258                 ArrayList<String> active = intent.getStringArrayListExtra(
259                         ConnectivityManager.EXTRA_ACTIVE_TETHER);
260                 ArrayList<String> errored = intent.getStringArrayListExtra(
261                         ConnectivityManager.EXTRA_ERRORED_TETHER);
262                 updateState(available.toArray(new String[available.size()]),
263                         active.toArray(new String[active.size()]),
264                         errored.toArray(new String[errored.size()]));
265             } else if (action.equals(Intent.ACTION_MEDIA_SHARED)) {
266                 mMassStorageActive = true;
267                 updateState();
268             } else if (action.equals(Intent.ACTION_MEDIA_UNSHARED)) {
269                 mMassStorageActive = false;
270                 updateState();
271             } else if (action.equals(UsbManager.ACTION_USB_STATE)) {
272                 mUsbConnected = intent.getBooleanExtra(UsbManager.USB_CONNECTED, false);
273                 updateState();
274             } else if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
275                 if (mBluetoothEnableForTether) {
276                     switch (intent
277                             .getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR)) {
278                         case BluetoothAdapter.STATE_ON:
279                             startTethering(TETHERING_BLUETOOTH);
280                             mBluetoothEnableForTether = false;
281                             break;
282 
283                         case BluetoothAdapter.STATE_OFF:
284                         case BluetoothAdapter.ERROR:
285                             mBluetoothEnableForTether = false;
286                             break;
287 
288                         default:
289                             // ignore transition states
290                     }
291                 }
292                 updateState();
293             } else if (action.equals(BLUETOOTH_TETHERING_STATE_CHANGED)) {
294                 updateState();
295             }
296         }
297     }
298 
299     @Override
onStart()300     public void onStart() {
301         super.onStart();
302 
303         if (mUnavailable) {
304             if (!isUiRestrictedByOnlyAdmin()) {
305                 getEmptyTextView().setText(R.string.tethering_settings_not_available);
306             }
307             getPreferenceScreen().removeAll();
308             return;
309         }
310 
311 
312         mStartTetheringCallback = new OnStartTetheringCallback(this);
313         mTetheringEventCallback = new TetheringEventCallback();
314         mTm.registerTetheringEventCallback(new HandlerExecutor(mHandler), mTetheringEventCallback);
315 
316         mMassStorageActive = Environment.MEDIA_SHARED.equals(Environment.getExternalStorageState());
317         registerReceiver();
318 
319         mEthernetListener = new EthernetListener();
320         if (mEm != null)
321             mEm.addListener(mEthernetListener);
322 
323         updateState();
324     }
325 
326     @Override
onStop()327     public void onStop() {
328         super.onStop();
329 
330         if (mUnavailable) {
331             return;
332         }
333         getActivity().unregisterReceiver(mTetherChangeReceiver);
334         mTm.unregisterTetheringEventCallback(mTetheringEventCallback);
335         if (mEm != null)
336             mEm.removeListener(mEthernetListener);
337         mTetherChangeReceiver = null;
338         mStartTetheringCallback = null;
339         mTetheringEventCallback = null;
340         mEthernetListener = null;
341     }
342 
343     @VisibleForTesting
registerReceiver()344     void registerReceiver() {
345         final Activity activity = getActivity();
346 
347         mTetherChangeReceiver = new TetherChangeReceiver();
348         IntentFilter filter = new IntentFilter(ConnectivityManager.ACTION_TETHER_STATE_CHANGED);
349         final Intent intent = activity.registerReceiver(mTetherChangeReceiver, filter);
350 
351         filter = new IntentFilter();
352         filter.addAction(UsbManager.ACTION_USB_STATE);
353         activity.registerReceiver(mTetherChangeReceiver, filter);
354 
355         filter = new IntentFilter();
356         filter.addAction(Intent.ACTION_MEDIA_SHARED);
357         filter.addAction(Intent.ACTION_MEDIA_UNSHARED);
358         filter.addDataScheme("file");
359         activity.registerReceiver(mTetherChangeReceiver, filter);
360 
361         filter = new IntentFilter();
362         filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
363         filter.addAction(BLUETOOTH_TETHERING_STATE_CHANGED);
364         activity.registerReceiver(mTetherChangeReceiver, filter);
365 
366         if (intent != null) mTetherChangeReceiver.onReceive(activity, intent);
367     }
368 
updateState()369     private void updateState() {
370         final ConnectivityManager cm =
371                 (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
372         final String[] available = cm.getTetherableIfaces();
373         final String[] tethered = cm.getTetheredIfaces();
374         final String[] errored = cm.getTetheringErroredIfaces();
375         updateState(available, tethered, errored);
376     }
377 
updateState(String[] available, String[] tethered, String[] errored)378     private void updateState(String[] available, String[] tethered,
379             String[] errored) {
380         updateUsbState(available, tethered, errored);
381         updateBluetoothState();
382         updateEthernetState(available, tethered);
383     }
384 
385     @VisibleForTesting
updateUsbState(String[] available, String[] tethered, String[] errored)386     void updateUsbState(String[] available, String[] tethered,
387             String[] errored) {
388         boolean usbAvailable = mUsbConnected && !mMassStorageActive;
389         int usbError = ConnectivityManager.TETHER_ERROR_NO_ERROR;
390         for (String s : available) {
391             for (String regex : mUsbRegexs) {
392                 if (s.matches(regex)) {
393                     if (usbError == ConnectivityManager.TETHER_ERROR_NO_ERROR) {
394                         usbError = mCm.getLastTetherError(s);
395                     }
396                 }
397             }
398         }
399         boolean usbTethered = false;
400         for (String s : tethered) {
401             for (String regex : mUsbRegexs) {
402                 if (s.matches(regex)) usbTethered = true;
403             }
404         }
405         boolean usbErrored = false;
406         for (String s: errored) {
407             for (String regex : mUsbRegexs) {
408                 if (s.matches(regex)) usbErrored = true;
409             }
410         }
411 
412         if (usbTethered) {
413             mUsbTether.setEnabled(!mDataSaverEnabled);
414             mUsbTether.setChecked(true);
415         } else if (usbAvailable) {
416             mUsbTether.setEnabled(!mDataSaverEnabled);
417             mUsbTether.setChecked(false);
418         } else {
419             mUsbTether.setEnabled(false);
420             mUsbTether.setChecked(false);
421         }
422     }
423 
424     @VisibleForTesting
getBluetoothState()425     int getBluetoothState() {
426         BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
427         if (adapter == null) {
428             return BluetoothAdapter.ERROR;
429         }
430         return adapter.getState();
431     }
432 
433     @VisibleForTesting
isBluetoothTetheringOn()434     boolean isBluetoothTetheringOn() {
435         final BluetoothPan bluetoothPan = mBluetoothPan.get();
436         return bluetoothPan != null && bluetoothPan.isTetheringOn();
437     }
438 
updateBluetoothState()439     private void updateBluetoothState() {
440         final int btState = getBluetoothState();
441         if (btState == BluetoothAdapter.ERROR) {
442             return;
443         }
444 
445         if (btState == BluetoothAdapter.STATE_TURNING_OFF) {
446             mBluetoothTether.setEnabled(false);
447         } else if (btState == BluetoothAdapter.STATE_TURNING_ON) {
448             mBluetoothTether.setEnabled(false);
449         } else {
450             if (btState == BluetoothAdapter.STATE_ON && isBluetoothTetheringOn()) {
451                 mBluetoothTether.setChecked(true);
452                 mBluetoothTether.setEnabled(!mDataSaverEnabled);
453             } else {
454                 mBluetoothTether.setEnabled(!mDataSaverEnabled);
455                 mBluetoothTether.setChecked(false);
456             }
457         }
458     }
459 
460     @VisibleForTesting
updateEthernetState(String[] available, String[] tethered)461     void updateEthernetState(String[] available, String[] tethered) {
462 
463         boolean isAvailable = false;
464         boolean isTethered = false;
465 
466         for (String s : available) {
467             if (s.matches(mEthernetRegex)) isAvailable = true;
468         }
469 
470         for (String s : tethered) {
471             if (s.matches(mEthernetRegex)) isTethered = true;
472         }
473 
474         if (isTethered) {
475             mEthernetTether.setEnabled(!mDataSaverEnabled);
476             mEthernetTether.setChecked(true);
477         } else if (isAvailable || (mEm != null && mEm.isAvailable())) {
478             mEthernetTether.setEnabled(!mDataSaverEnabled);
479             mEthernetTether.setChecked(false);
480         } else {
481             mEthernetTether.setEnabled(false);
482             mEthernetTether.setChecked(false);
483         }
484     }
485 
startTethering(int choice)486     private void startTethering(int choice) {
487         if (choice == TETHERING_BLUETOOTH) {
488             // Turn on Bluetooth first.
489             BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
490             if (adapter.getState() == BluetoothAdapter.STATE_OFF) {
491                 mBluetoothEnableForTether = true;
492                 adapter.enable();
493                 mBluetoothTether.setEnabled(false);
494                 return;
495             }
496         }
497 
498         mCm.startTethering(choice, true, mStartTetheringCallback, mHandler);
499     }
500 
501     @Override
onPreferenceTreeClick(Preference preference)502     public boolean onPreferenceTreeClick(Preference preference) {
503         if (preference == mUsbTether) {
504             if (mUsbTether.isChecked()) {
505                 startTethering(TETHERING_USB);
506             } else {
507                 mCm.stopTethering(TETHERING_USB);
508             }
509         } else if (preference == mBluetoothTether) {
510             if (mBluetoothTether.isChecked()) {
511                 startTethering(TETHERING_BLUETOOTH);
512             } else {
513                 mCm.stopTethering(TETHERING_BLUETOOTH);
514             }
515         } else if (preference == mEthernetTether) {
516             if (mEthernetTether.isChecked()) {
517                 startTethering(TETHERING_ETHERNET);
518             } else {
519                 mCm.stopTethering(TETHERING_ETHERNET);
520             }
521         }
522 
523         return super.onPreferenceTreeClick(preference);
524     }
525 
526     @Override
getHelpResource()527     public int getHelpResource() {
528         return R.string.help_url_tether;
529     }
530 
531     private BluetoothProfile.ServiceListener mProfileServiceListener =
532             new BluetoothProfile.ServiceListener() {
533         public void onServiceConnected(int profile, BluetoothProfile proxy) {
534             mBluetoothPan.set((BluetoothPan) proxy);
535         }
536         public void onServiceDisconnected(int profile) {
537             mBluetoothPan.set(null);
538         }
539     };
540 
541     public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
542             new BaseSearchIndexProvider() {
543                 @Override
544                 public List<SearchIndexableResource> getXmlResourcesToIndex(
545                         Context context, boolean enabled) {
546                     final SearchIndexableResource sir = new SearchIndexableResource(context);
547                     sir.xmlResId = R.xml.tether_prefs;
548                     return Arrays.asList(sir);
549                 }
550 
551                 @Override
552                 protected boolean isPageSearchEnabled(Context context) {
553                     return !FeatureFlagUtils.isEnabled(context, FeatureFlags.TETHER_ALL_IN_ONE);
554                 }
555 
556                 @Override
557                 public List<String> getNonIndexableKeys(Context context) {
558                     final List<String> keys = super.getNonIndexableKeys(context);
559                     final ConnectivityManager cm =
560                             context.getSystemService(ConnectivityManager.class);
561 
562                     if (!TetherUtil.isTetherAvailable(context)) {
563                         keys.add(KEY_TETHER_PREFS_SCREEN);
564                         keys.add(KEY_WIFI_TETHER);
565                     }
566 
567                     final boolean usbAvailable =
568                             cm.getTetherableUsbRegexs().length != 0;
569                     if (!usbAvailable || Utils.isMonkeyRunning()) {
570                         keys.add(KEY_USB_TETHER_SETTINGS);
571                     }
572 
573                     final boolean bluetoothAvailable =
574                             cm.getTetherableBluetoothRegexs().length != 0;
575                     if (!bluetoothAvailable) {
576                         keys.add(KEY_ENABLE_BLUETOOTH_TETHERING);
577                     }
578 
579                     final boolean ethernetAvailable = !TextUtils.isEmpty(
580                             context.getResources().getString(
581                                     com.android.internal.R.string.config_ethernet_iface_regex));
582                     if (!ethernetAvailable) {
583                         keys.add(KEY_ENABLE_ETHERNET_TETHERING);
584                     }
585                     return keys;
586                 }
587     };
588 
589     private static final class OnStartTetheringCallback extends
590             ConnectivityManager.OnStartTetheringCallback {
591         final WeakReference<TetherSettings> mTetherSettings;
592 
OnStartTetheringCallback(TetherSettings settings)593         OnStartTetheringCallback(TetherSettings settings) {
594             mTetherSettings = new WeakReference<>(settings);
595         }
596 
597         @Override
onTetheringStarted()598         public void onTetheringStarted() {
599             update();
600         }
601 
602         @Override
onTetheringFailed()603         public void onTetheringFailed() {
604             update();
605         }
606 
update()607         private void update() {
608             TetherSettings settings = mTetherSettings.get();
609             if (settings != null) {
610                 settings.updateState();
611             }
612         }
613     }
614 
615     private final class TetheringEventCallback implements TetheringManager.TetheringEventCallback {
616         @Override
onTetheredInterfacesChanged(List<String> interfaces)617         public void onTetheredInterfacesChanged(List<String> interfaces) {
618             updateState();
619         }
620     }
621 
622     private final class EthernetListener implements EthernetManager.Listener {
onAvailabilityChanged(String iface, boolean isAvailable)623         public void onAvailabilityChanged(String iface, boolean isAvailable) {
624             mHandler.post(TetherSettings.this::updateState);
625         }
626     }
627 }
628