1 /*
2  * Copyright (C) 2022 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.network.tether;
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 static com.android.settings.wifi.WifiUtils.canShowWifiHotspot;
24 import static com.android.settingslib.RestrictedLockUtilsInternal.checkIfUsbDataSignalingIsDisabled;
25 
26 import android.app.Activity;
27 import android.app.settings.SettingsEnums;
28 import android.bluetooth.BluetoothAdapter;
29 import android.bluetooth.BluetoothPan;
30 import android.bluetooth.BluetoothProfile;
31 import android.content.BroadcastReceiver;
32 import android.content.Context;
33 import android.content.Intent;
34 import android.content.IntentFilter;
35 import android.hardware.usb.UsbManager;
36 import android.net.ConnectivityManager;
37 import android.net.EthernetManager;
38 import android.net.IpConfiguration;
39 import android.net.TetheringManager;
40 import android.net.wifi.WifiManager;
41 import android.os.Bundle;
42 import android.os.Environment;
43 import android.os.Handler;
44 import android.os.UserHandle;
45 import android.os.UserManager;
46 import android.provider.SearchIndexableResource;
47 import android.text.TextUtils;
48 import android.util.Log;
49 
50 import androidx.annotation.NonNull;
51 import androidx.annotation.VisibleForTesting;
52 import androidx.lifecycle.ViewModelProvider;
53 import androidx.preference.Preference;
54 import androidx.preference.TwoStatePreference;
55 
56 import com.android.settings.R;
57 import com.android.settings.RestrictedSettingsFragment;
58 import com.android.settings.Utils;
59 import com.android.settings.datausage.DataSaverBackend;
60 import com.android.settings.search.BaseSearchIndexProvider;
61 import com.android.settings.wifi.tether.WifiTetherPreferenceController;
62 import com.android.settingslib.RestrictedLockUtils;
63 import com.android.settingslib.RestrictedSwitchPreference;
64 import com.android.settingslib.TetherUtil;
65 import com.android.settingslib.search.SearchIndexable;
66 
67 import java.lang.ref.WeakReference;
68 import java.util.ArrayList;
69 import java.util.Arrays;
70 import java.util.HashSet;
71 import java.util.List;
72 import java.util.concurrent.atomic.AtomicReference;
73 
74 /**
75  * Displays preferences for Tethering.
76  */
77 @SearchIndexable
78 public class TetherSettings extends RestrictedSettingsFragment
79         implements DataSaverBackend.Listener {
80 
81     @VisibleForTesting
82     static final String KEY_TETHER_PREFS_SCREEN = "tether_prefs_screen";
83     @VisibleForTesting
84     static final String KEY_WIFI_TETHER = "wifi_tether";
85     @VisibleForTesting
86     static final String KEY_USB_TETHER_SETTINGS = "usb_tether_settings";
87     @VisibleForTesting
88     static final String KEY_ENABLE_BLUETOOTH_TETHERING = "enable_bluetooth_tethering";
89     private static final String KEY_ENABLE_ETHERNET_TETHERING = "enable_ethernet_tethering";
90     private static final String KEY_DATA_SAVER_FOOTER = "disabled_on_data_saver";
91     @VisibleForTesting
92     static final String KEY_TETHER_PREFS_TOP_INTRO = "tether_prefs_top_intro";
93 
94     private static final String TAG = "TetheringSettings";
95     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
96 
97     @VisibleForTesting
98     RestrictedSwitchPreference mUsbTether;
99     @VisibleForTesting
100     TwoStatePreference mBluetoothTether;
101     @VisibleForTesting
102     TwoStatePreference mEthernetTether;
103 
104     private BroadcastReceiver mTetherChangeReceiver;
105     private BroadcastReceiver mBluetoothStateReceiver;
106 
107     private String[] mBluetoothRegexs;
108     private AtomicReference<BluetoothPan> mBluetoothPan = new AtomicReference<>();
109 
110     private Handler mHandler = new Handler();
111     private OnStartTetheringCallback mStartTetheringCallback;
112     private ConnectivityManager mCm;
113     private EthernetManager mEm;
114     private EthernetListener mEthernetListener;
115     private final HashSet<String> mAvailableInterfaces = new HashSet<>();
116 
117     @VisibleForTesting
118     WifiTetherPreferenceController mWifiTetherPreferenceController;
119 
120     private boolean mUsbConnected;
121     private boolean mMassStorageActive;
122 
123     private boolean mBluetoothEnableForTether;
124 
125     private DataSaverBackend mDataSaverBackend;
126     private boolean mDataSaverEnabled;
127     @VisibleForTesting
128     Preference mDataSaverFooter;
129 
130     @VisibleForTesting
131     String[] mUsbRegexs;
132     @VisibleForTesting
133     Context mContext;
134     @VisibleForTesting
135     TetheringManager mTm;
136 
137     @Override
getMetricsCategory()138     public int getMetricsCategory() {
139         return SettingsEnums.TETHER;
140     }
141 
TetherSettings()142     public TetherSettings() {
143         super(UserManager.DISALLOW_CONFIG_TETHERING);
144     }
145 
146     @Override
onCreate(Bundle icicle)147     public void onCreate(Bundle icicle) {
148         super.onCreate(icicle);
149         // Even when the UI is restricted, addPreferencesFromResource cannot be omitted.
150         addPreferencesFromResource(R.xml.tether_prefs);
151         setIfOnlyAvailableForAdmins(true);
152         if (isUiRestricted()) {
153             return;
154         }
155 
156         mContext = getContext();
157         mDataSaverBackend = new DataSaverBackend(mContext);
158         mDataSaverEnabled = mDataSaverBackend.isDataSaverEnabled();
159         mDataSaverFooter = findPreference(KEY_DATA_SAVER_FOOTER);
160 
161         setupTetherPreference();
162         setupViewModel();
163 
164         final Activity activity = getActivity();
165         BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
166         if (adapter != null) {
167             adapter.getProfileProxy(activity.getApplicationContext(), mProfileServiceListener,
168                     BluetoothProfile.PAN);
169         }
170         if (mBluetoothStateReceiver == null) {
171             mBluetoothStateReceiver = new BluetoothStateReceiver();
172             mContext.registerReceiver(
173                     mBluetoothStateReceiver,
174                     new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));
175         }
176 
177         setTopIntroPreferenceTitle();
178 
179         mDataSaverBackend.addListener(this);
180 
181         mCm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
182         // Some devices do not have available EthernetManager. In that case getSystemService will
183         // return null.
184         mEm = mContext.getSystemService(EthernetManager.class);
185 
186         mUsbRegexs = mTm.getTetherableUsbRegexs();
187         mBluetoothRegexs = mTm.getTetherableBluetoothRegexs();
188 
189         final boolean usbAvailable = mUsbRegexs.length != 0;
190         final boolean bluetoothAvailable = adapter != null && mBluetoothRegexs.length != 0;
191         final boolean ethernetAvailable = (mEm != null);
192 
193         if (!usbAvailable || Utils.isMonkeyRunning()) {
194             getPreferenceScreen().removePreference(mUsbTether);
195         }
196 
197         mWifiTetherPreferenceController.displayPreference(getPreferenceScreen());
198 
199         if (!bluetoothAvailable) {
200             getPreferenceScreen().removePreference(mBluetoothTether);
201         } else {
202             BluetoothPan pan = mBluetoothPan.get();
203             if (pan != null && pan.isTetheringOn()) {
204                 mBluetoothTether.setChecked(true);
205             } else {
206                 mBluetoothTether.setChecked(false);
207             }
208         }
209         if (!ethernetAvailable) getPreferenceScreen().removePreference(mEthernetTether);
210         // Set initial state based on Data Saver mode.
211         onDataSaverChanged(mDataSaverBackend.isDataSaverEnabled());
212     }
213 
214     @VisibleForTesting
setupViewModel()215     void setupViewModel() {
216         TetheringManagerModel model = new ViewModelProvider(this).get(TetheringManagerModel.class);
217         mWifiTetherPreferenceController =
218                 new WifiTetherPreferenceController(getContext(), getSettingsLifecycle(), model);
219         mTm = model.getTetheringManager();
220         model.getTetheredInterfaces().observe(this, this::onTetheredInterfacesChanged);
221     }
222 
223     @Override
onDestroy()224     public void onDestroy() {
225         if (isUiRestricted()) {
226             super.onDestroy();
227             return;
228         }
229 
230         mDataSaverBackend.remListener(this);
231 
232         BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
233         BluetoothProfile profile = mBluetoothPan.getAndSet(null);
234         if (profile != null && adapter != null) {
235             adapter.closeProfileProxy(BluetoothProfile.PAN, profile);
236         }
237         if (mBluetoothStateReceiver != null) {
238             mContext.unregisterReceiver(mBluetoothStateReceiver);
239             mBluetoothStateReceiver = null;
240         }
241 
242         super.onDestroy();
243     }
244 
245     @VisibleForTesting
setupTetherPreference()246     void setupTetherPreference() {
247         mUsbTether = (RestrictedSwitchPreference) findPreference(KEY_USB_TETHER_SETTINGS);
248         mBluetoothTether = (TwoStatePreference) findPreference(KEY_ENABLE_BLUETOOTH_TETHERING);
249         mEthernetTether = (TwoStatePreference) findPreference(KEY_ENABLE_ETHERNET_TETHERING);
250     }
251 
252     @Override
onDataSaverChanged(boolean isDataSaving)253     public void onDataSaverChanged(boolean isDataSaving) {
254         mDataSaverEnabled = isDataSaving;
255         mWifiTetherPreferenceController.setDataSaverEnabled(mDataSaverEnabled);
256         mUsbTether.setEnabled(!mDataSaverEnabled);
257         mBluetoothTether.setEnabled(!mDataSaverEnabled);
258         mEthernetTether.setEnabled(!mDataSaverEnabled);
259         mDataSaverFooter.setVisible(mDataSaverEnabled);
260     }
261 
262     @Override
onAllowlistStatusChanged(int uid, boolean isAllowlisted)263     public void onAllowlistStatusChanged(int uid, boolean isAllowlisted) {
264     }
265 
266     @Override
onDenylistStatusChanged(int uid, boolean isDenylisted)267     public void onDenylistStatusChanged(int uid, boolean isDenylisted)  {
268     }
269 
270     @VisibleForTesting
setTopIntroPreferenceTitle()271     void setTopIntroPreferenceTitle() {
272         final Preference topIntroPreference = findPreference(KEY_TETHER_PREFS_TOP_INTRO);
273         final WifiManager wifiManager = mContext.getSystemService(WifiManager.class);
274         if (wifiManager.isStaApConcurrencySupported()) {
275             topIntroPreference.setTitle(R.string.tethering_footer_info_sta_ap_concurrency);
276         } else {
277             topIntroPreference.setTitle(R.string.tethering_footer_info);
278         }
279     }
280 
281     private class BluetoothStateReceiver extends BroadcastReceiver {
282         @Override
onReceive(Context context, Intent intent)283         public void onReceive(Context context, Intent intent) {
284             final String action = intent.getAction();
285             Log.i(TAG, "onReceive: action: " + action);
286 
287             if (TextUtils.equals(action, BluetoothAdapter.ACTION_STATE_CHANGED)) {
288                 final int state =
289                         intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
290                 Log.i(TAG, "onReceive: state: " + BluetoothAdapter.nameForState(state));
291                 final BluetoothProfile profile = mBluetoothPan.get();
292                 switch(state) {
293                     case BluetoothAdapter.STATE_ON:
294                         BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
295                         if (profile == null && adapter != null) {
296                             adapter.getProfileProxy(mContext, mProfileServiceListener,
297                                     BluetoothProfile.PAN);
298                         }
299                         break;
300                 }
301             }
302         }
303     }
304 
305     private class TetherChangeReceiver extends BroadcastReceiver {
306         @Override
onReceive(Context content, Intent intent)307         public void onReceive(Context content, Intent intent) {
308             String action = intent.getAction();
309             if (DEBUG) {
310                 Log.d(TAG, "onReceive() action : " + action);
311             }
312             // TODO(b/194961339): Stop using ACTION_TETHER_STATE_CHANGED and use
313             //  mTetheringEventCallback instead.
314             if (action.equals(TetheringManager.ACTION_TETHER_STATE_CHANGED)) {
315                 // TODO - this should understand the interface types
316                 ArrayList<String> available = intent.getStringArrayListExtra(
317                         TetheringManager.EXTRA_AVAILABLE_TETHER);
318                 ArrayList<String> active = intent.getStringArrayListExtra(
319                         TetheringManager.EXTRA_ACTIVE_TETHER);
320                 updateBluetoothState();
321                 updateEthernetState(available.toArray(new String[available.size()]),
322                         active.toArray(new String[active.size()]));
323             } else if (action.equals(Intent.ACTION_MEDIA_SHARED)) {
324                 mMassStorageActive = true;
325                 updateBluetoothAndEthernetState();
326                 updateUsbPreference();
327             } else if (action.equals(Intent.ACTION_MEDIA_UNSHARED)) {
328                 mMassStorageActive = false;
329                 updateBluetoothAndEthernetState();
330                 updateUsbPreference();
331             } else if (action.equals(UsbManager.ACTION_USB_STATE)) {
332                 mUsbConnected = intent.getBooleanExtra(UsbManager.USB_CONNECTED, false);
333                 updateBluetoothAndEthernetState();
334                 updateUsbPreference();
335             } else if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
336                 if (mBluetoothEnableForTether) {
337                     switch (intent
338                             .getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR)) {
339                         case BluetoothAdapter.STATE_ON:
340                             startTethering(TETHERING_BLUETOOTH);
341                             mBluetoothEnableForTether = false;
342                             break;
343 
344                         case BluetoothAdapter.STATE_OFF:
345                         case BluetoothAdapter.ERROR:
346                             mBluetoothEnableForTether = false;
347                             break;
348 
349                         default:
350                             // ignore transition states
351                     }
352                 }
353                 updateBluetoothAndEthernetState();
354             } else if (action.equals(BluetoothPan.ACTION_TETHERING_STATE_CHANGED)) {
355                 updateBluetoothAndEthernetState();
356             }
357         }
358     }
359 
360     @Override
onStart()361     public void onStart() {
362         super.onStart();
363 
364         if (isUiRestricted()) {
365             if (!isUiRestrictedByOnlyAdmin()) {
366                 getEmptyTextView().setText(
367                         com.android.settingslib.R.string.tethering_settings_not_available);
368             }
369             getPreferenceScreen().removeAll();
370             return;
371         }
372 
373 
374         mStartTetheringCallback = new OnStartTetheringCallback(this);
375 
376         mMassStorageActive = Environment.MEDIA_SHARED.equals(Environment.getExternalStorageState());
377         registerReceiver();
378 
379         mEthernetListener = new EthernetListener(this);
380         if (mEm != null) {
381             mEm.addInterfaceStateListener(mContext.getApplicationContext().getMainExecutor(),
382                     mEthernetListener);
383         }
384 
385         updateUsbState();
386         updateBluetoothAndEthernetState();
387     }
388 
389     @Override
onStop()390     public void onStop() {
391         super.onStop();
392 
393         if (isUiRestricted()) {
394             return;
395         }
396         getActivity().unregisterReceiver(mTetherChangeReceiver);
397         if (mEm != null) {
398             mEm.removeInterfaceStateListener(mEthernetListener);
399         }
400         mTetherChangeReceiver = null;
401         mStartTetheringCallback = null;
402     }
403 
404     @VisibleForTesting
registerReceiver()405     void registerReceiver() {
406         final Activity activity = getActivity();
407 
408         mTetherChangeReceiver = new TetherChangeReceiver();
409         IntentFilter filter = new IntentFilter(TetheringManager.ACTION_TETHER_STATE_CHANGED);
410         final Intent intent = activity.registerReceiver(mTetherChangeReceiver, filter);
411 
412         filter = new IntentFilter();
413         filter.addAction(UsbManager.ACTION_USB_STATE);
414         activity.registerReceiver(mTetherChangeReceiver, filter);
415 
416         filter = new IntentFilter();
417         filter.addAction(Intent.ACTION_MEDIA_SHARED);
418         filter.addAction(Intent.ACTION_MEDIA_UNSHARED);
419         filter.addDataScheme("file");
420         activity.registerReceiver(mTetherChangeReceiver, filter);
421 
422         filter = new IntentFilter();
423         filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
424         filter.addAction(BluetoothPan.ACTION_TETHERING_STATE_CHANGED);
425         activity.registerReceiver(mTetherChangeReceiver, filter);
426 
427         if (intent != null) mTetherChangeReceiver.onReceive(activity, intent);
428     }
429 
430     // TODO(b/194961339): Separate the updateBluetoothAndEthernetState() to two methods,
431     //  updateBluetoothAndEthernetState() and updateBluetoothAndEthernetPreference().
432     //  Because we should update the state when only receiving tethering
433     //  state changes and update preference when usb or media share changed.
updateBluetoothAndEthernetState()434     private void updateBluetoothAndEthernetState() {
435         String[] tethered = mTm.getTetheredIfaces();
436         updateBluetoothAndEthernetState(tethered);
437     }
438 
updateBluetoothAndEthernetState(String[] tethered)439     private void updateBluetoothAndEthernetState(String[] tethered) {
440         String[] available = mTm.getTetherableIfaces();
441         updateBluetoothState();
442         updateEthernetState(available, tethered);
443     }
444 
updateUsbState()445     private void updateUsbState() {
446         String[] tethered = mTm.getTetheredIfaces();
447         updateUsbState(tethered);
448     }
449 
450     @VisibleForTesting
updateUsbState(String[] tethered)451     void updateUsbState(String[] tethered) {
452         boolean usbTethered = false;
453         for (String s : tethered) {
454             for (String regex : mUsbRegexs) {
455                 if (s.matches(regex)) usbTethered = true;
456             }
457         }
458         if (DEBUG) {
459             Log.d(TAG, "updateUsbState() mUsbConnected : " + mUsbConnected
460                     + ", mMassStorageActive : " + mMassStorageActive
461                     + ", usbTethered : " + usbTethered);
462         }
463         if (usbTethered) {
464             mUsbTether.setEnabled(!mDataSaverEnabled);
465             mUsbTether.setChecked(true);
466             final RestrictedLockUtils.EnforcedAdmin enforcedAdmin =
467                     checkIfUsbDataSignalingIsDisabled(mContext, UserHandle.myUserId());
468             if (enforcedAdmin != null) {
469                 mUsbTether.setDisabledByAdmin(enforcedAdmin);
470             }
471         } else {
472             mUsbTether.setChecked(false);
473             updateUsbPreference();
474         }
475     }
476 
updateUsbPreference()477     private void updateUsbPreference() {
478         boolean usbAvailable = mUsbConnected && !mMassStorageActive;
479         final RestrictedLockUtils.EnforcedAdmin enforcedAdmin =
480                 checkIfUsbDataSignalingIsDisabled(mContext, UserHandle.myUserId());
481 
482         if (enforcedAdmin != null) {
483             mUsbTether.setDisabledByAdmin(enforcedAdmin);
484         } else if (usbAvailable) {
485             mUsbTether.setEnabled(!mDataSaverEnabled);
486         } else {
487             mUsbTether.setEnabled(false);
488         }
489     }
490 
491     @VisibleForTesting
getBluetoothState()492     int getBluetoothState() {
493         BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
494         if (adapter == null) {
495             return BluetoothAdapter.ERROR;
496         }
497         return adapter.getState();
498     }
499 
500     @VisibleForTesting
isBluetoothTetheringOn()501     boolean isBluetoothTetheringOn() {
502         final BluetoothPan bluetoothPan = mBluetoothPan.get();
503         return bluetoothPan != null && bluetoothPan.isTetheringOn();
504     }
505 
updateBluetoothState()506     private void updateBluetoothState() {
507         final int btState = getBluetoothState();
508         if (DEBUG) {
509             Log.d(TAG, "updateBluetoothState() btState : " + btState);
510         }
511         if (btState == BluetoothAdapter.ERROR) {
512             Log.w(TAG, "updateBluetoothState() Bluetooth state is error!");
513             return;
514         }
515 
516         if (btState == BluetoothAdapter.STATE_TURNING_OFF) {
517             mBluetoothTether.setEnabled(false);
518         } else if (btState == BluetoothAdapter.STATE_TURNING_ON) {
519             mBluetoothTether.setEnabled(false);
520         } else {
521             if (btState == BluetoothAdapter.STATE_ON && isBluetoothTetheringOn()) {
522                 mBluetoothTether.setChecked(true);
523                 mBluetoothTether.setEnabled(!mDataSaverEnabled);
524             } else {
525                 mBluetoothTether.setEnabled(!mDataSaverEnabled);
526                 mBluetoothTether.setChecked(false);
527             }
528         }
529     }
530 
531     @VisibleForTesting
updateEthernetState(String[] available, String[] tethered)532     void updateEthernetState(String[] available, String[] tethered) {
533         boolean isAvailable = false;
534         boolean isTethered = false;
535 
536         for (String s : available) {
537             if (mAvailableInterfaces.contains(s)) isAvailable = true;
538         }
539 
540         for (String s : tethered) {
541             if (mAvailableInterfaces.contains(s)) isTethered = true;
542         }
543 
544         if (DEBUG) {
545             Log.d(TAG, "updateEthernetState() isAvailable : " + isAvailable
546                     + ", isTethered : " + isTethered);
547         }
548 
549         if (isTethered) {
550             mEthernetTether.setEnabled(!mDataSaverEnabled);
551             mEthernetTether.setChecked(true);
552         } else if (mAvailableInterfaces.size() > 0) {
553             mEthernetTether.setEnabled(!mDataSaverEnabled);
554             mEthernetTether.setChecked(false);
555         } else {
556             mEthernetTether.setEnabled(false);
557             mEthernetTether.setChecked(false);
558         }
559     }
560 
startTethering(int choice)561     private void startTethering(int choice) {
562         if (choice == TETHERING_BLUETOOTH) {
563             // Turn on Bluetooth first.
564             BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
565             if (adapter.getState() == BluetoothAdapter.STATE_OFF) {
566                 mBluetoothEnableForTether = true;
567                 adapter.enable();
568                 mBluetoothTether.setEnabled(false);
569                 return;
570             }
571         }
572 
573         mCm.startTethering(choice, true, mStartTetheringCallback, mHandler);
574     }
575 
576     @Override
onPreferenceTreeClick(Preference preference)577     public boolean onPreferenceTreeClick(Preference preference) {
578         if (preference == mUsbTether) {
579             if (mUsbTether.isChecked()) {
580                 startTethering(TETHERING_USB);
581             } else {
582                 mCm.stopTethering(TETHERING_USB);
583             }
584         } else if (preference == mBluetoothTether) {
585             if (mBluetoothTether.isChecked()) {
586                 startTethering(TETHERING_BLUETOOTH);
587             } else {
588                 mCm.stopTethering(TETHERING_BLUETOOTH);
589             }
590         } else if (preference == mEthernetTether) {
591             if (mEthernetTether.isChecked()) {
592                 startTethering(TETHERING_ETHERNET);
593             } else {
594                 mCm.stopTethering(TETHERING_ETHERNET);
595             }
596         }
597 
598         return super.onPreferenceTreeClick(preference);
599     }
600 
601     @Override
getHelpResource()602     public int getHelpResource() {
603         return R.string.help_url_tether;
604     }
605 
606     private BluetoothProfile.ServiceListener mProfileServiceListener =
607             new BluetoothProfile.ServiceListener() {
608                 @Override
609                 public void onServiceConnected(int profile, BluetoothProfile proxy) {
610                     if (mBluetoothPan.get() == null) {
611                         mBluetoothPan.set((BluetoothPan) proxy);
612                         updateBluetoothState();
613                     }
614                 }
615 
616                 @Override
617                 public void onServiceDisconnected(int profile) { /* Do nothing */ }
618             };
619 
620     public static final BaseSearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
621             new BaseSearchIndexProvider() {
622                 @Override
623                 public List<SearchIndexableResource> getXmlResourcesToIndex(
624                         Context context, boolean enabled) {
625                     final SearchIndexableResource sir = new SearchIndexableResource(context);
626                     sir.xmlResId = R.xml.tether_prefs;
627                     return Arrays.asList(sir);
628                 }
629 
630                 @Override
631                 public List<String> getNonIndexableKeys(Context context) {
632                     final List<String> keys = super.getNonIndexableKeys(context);
633                     final TetheringManager tm =
634                             context.getSystemService(TetheringManager.class);
635 
636                     if (!TetherUtil.isTetherAvailable(context)) {
637                         keys.add(KEY_TETHER_PREFS_SCREEN);
638                     }
639 
640                     if (!canShowWifiHotspot(context) || !TetherUtil.isTetherAvailable(context)) {
641                         keys.add(KEY_WIFI_TETHER);
642                     }
643 
644                     final boolean usbAvailable =
645                             tm.getTetherableUsbRegexs().length != 0;
646                     if (!usbAvailable || Utils.isMonkeyRunning()) {
647                         keys.add(KEY_USB_TETHER_SETTINGS);
648                     }
649 
650                     final boolean bluetoothAvailable =
651                             tm.getTetherableBluetoothRegexs().length != 0;
652                     if (!bluetoothAvailable) {
653                         keys.add(KEY_ENABLE_BLUETOOTH_TETHERING);
654                     }
655 
656                     final EthernetManager em =
657                             context.getSystemService(EthernetManager.class);
658                     final boolean ethernetAvailable = (em != null);
659                     if (!ethernetAvailable) {
660                         keys.add(KEY_ENABLE_ETHERNET_TETHERING);
661                     }
662                     return keys;
663                 }
664     };
665 
666     private static final class OnStartTetheringCallback extends
667             ConnectivityManager.OnStartTetheringCallback {
668         final WeakReference<TetherSettings> mTetherSettings;
669 
OnStartTetheringCallback(TetherSettings settings)670         OnStartTetheringCallback(TetherSettings settings) {
671             mTetherSettings = new WeakReference<>(settings);
672         }
673 
674         @Override
onTetheringStarted()675         public void onTetheringStarted() {
676             update();
677         }
678 
679         @Override
onTetheringFailed()680         public void onTetheringFailed() {
681             update();
682         }
683 
update()684         private void update() {
685             TetherSettings settings = mTetherSettings.get();
686             if (settings != null) {
687                 settings.updateBluetoothAndEthernetState();
688             }
689         }
690     }
691 
onTetheredInterfacesChanged(List<String> interfaces)692     protected void onTetheredInterfacesChanged(List<String> interfaces) {
693         Log.d(TAG, "onTetheredInterfacesChanged() interfaces : " + interfaces.toString());
694         final String[] tethered = interfaces.toArray(new String[interfaces.size()]);
695         updateUsbState(tethered);
696         updateBluetoothAndEthernetState(tethered);
697     }
698 
699     private static final class EthernetListener implements EthernetManager.InterfaceStateListener {
700         final WeakReference<TetherSettings> mTetherSettings;
701 
EthernetListener(TetherSettings settings)702         EthernetListener(TetherSettings settings) {
703             mTetherSettings = new WeakReference<>(settings);
704         }
705 
706         @Override
onInterfaceStateChanged(@onNull String iface, int state, int role, @NonNull IpConfiguration configuration)707         public void onInterfaceStateChanged(@NonNull String iface, int state, int role,
708                 @NonNull IpConfiguration configuration) {
709             final TetherSettings tetherSettings = mTetherSettings.get();
710             if (tetherSettings == null) {
711                 return;
712             }
713             tetherSettings.onInterfaceStateChanged(iface, state, role, configuration);
714         }
715     }
716 
onInterfaceStateChanged(@onNull String iface, int state, int role, @NonNull IpConfiguration configuration)717     void onInterfaceStateChanged(@NonNull String iface, int state, int role,
718             @NonNull IpConfiguration configuration) {
719         if (state == EthernetManager.STATE_LINK_UP) {
720             mAvailableInterfaces.add(iface);
721         } else {
722             mAvailableInterfaces.remove(iface);
723         }
724         updateBluetoothAndEthernetState();
725     }
726 }
727