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      1 /*
      2  * Copyright (C) 2014 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.systemui.statusbar.policy;
     18 
     19 import android.content.BroadcastReceiver;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.IntentFilter;
     23 import android.net.wifi.WifiManager;
     24 import android.os.UserHandle;
     25 import android.util.Log;
     26 
     27 import com.android.settingslib.TetherUtil;
     28 
     29 import java.io.FileDescriptor;
     30 import java.io.PrintWriter;
     31 import java.util.ArrayList;
     32 
     33 public class HotspotControllerImpl implements HotspotController {
     34 
     35     private static final String TAG = "HotspotController";
     36     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
     37     private static final Intent TETHER_SERVICE_INTENT = new Intent()
     38             .putExtra(TetherUtil.EXTRA_ADD_TETHER_TYPE, TetherUtil.TETHERING_WIFI)
     39             .putExtra(TetherUtil.EXTRA_SET_ALARM, true)
     40             .putExtra(TetherUtil.EXTRA_RUN_PROVISION, true)
     41             .putExtra(TetherUtil.EXTRA_ENABLE_WIFI_TETHER, true)
     42             .setComponent(TetherUtil.TETHER_SERVICE);
     43 
     44     private final ArrayList<Callback> mCallbacks = new ArrayList<Callback>();
     45     private final Receiver mReceiver = new Receiver();
     46     private final Context mContext;
     47 
     48     private int mHotspotState;
     49 
     50     public HotspotControllerImpl(Context context) {
     51         mContext = context;
     52     }
     53 
     54     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
     55         pw.println("HotspotController state:");
     56         pw.print("  mHotspotEnabled="); pw.println(stateToString(mHotspotState));
     57     }
     58 
     59     private static String stateToString(int hotspotState) {
     60         switch (hotspotState) {
     61             case WifiManager.WIFI_AP_STATE_DISABLED:
     62                 return "DISABLED";
     63             case WifiManager.WIFI_AP_STATE_DISABLING:
     64                 return "DISABLING";
     65             case WifiManager.WIFI_AP_STATE_ENABLED:
     66                 return "ENABLED";
     67             case WifiManager.WIFI_AP_STATE_ENABLING:
     68                 return "ENABLING";
     69             case WifiManager.WIFI_AP_STATE_FAILED:
     70                 return "FAILED";
     71         }
     72         return null;
     73     }
     74 
     75     public void addCallback(Callback callback) {
     76         if (callback == null || mCallbacks.contains(callback)) return;
     77         if (DEBUG) Log.d(TAG, "addCallback " + callback);
     78         mCallbacks.add(callback);
     79         mReceiver.setListening(!mCallbacks.isEmpty());
     80     }
     81 
     82     public void removeCallback(Callback callback) {
     83         if (callback == null) return;
     84         if (DEBUG) Log.d(TAG, "removeCallback " + callback);
     85         mCallbacks.remove(callback);
     86         mReceiver.setListening(!mCallbacks.isEmpty());
     87     }
     88 
     89     @Override
     90     public boolean isHotspotEnabled() {
     91         return mHotspotState == WifiManager.WIFI_AP_STATE_ENABLED;
     92     }
     93 
     94     @Override
     95     public boolean isHotspotSupported() {
     96         return TetherUtil.isTetheringSupported(mContext);
     97     }
     98 
     99     @Override
    100     public void setHotspotEnabled(boolean enabled) {
    101         // Call provisioning app which is called when enabling Tethering from Settings
    102         if (enabled && TetherUtil.isProvisioningNeeded(mContext)) {
    103             mContext.startServiceAsUser(TETHER_SERVICE_INTENT, UserHandle.CURRENT);
    104         } else {
    105             TetherUtil.setWifiTethering(enabled, mContext);
    106         }
    107     }
    108 
    109     private void fireCallback(boolean isEnabled) {
    110         for (Callback callback : mCallbacks) {
    111             callback.onHotspotChanged(isEnabled);
    112         }
    113     }
    114 
    115     private final class Receiver extends BroadcastReceiver {
    116         private boolean mRegistered;
    117 
    118         public void setListening(boolean listening) {
    119             if (listening && !mRegistered) {
    120                 if (DEBUG) Log.d(TAG, "Registering receiver");
    121                 final IntentFilter filter = new IntentFilter();
    122                 filter.addAction(WifiManager.WIFI_AP_STATE_CHANGED_ACTION);
    123                 mContext.registerReceiver(this, filter);
    124                 mRegistered = true;
    125             } else if (!listening && mRegistered) {
    126                 if (DEBUG) Log.d(TAG, "Unregistering receiver");
    127                 mContext.unregisterReceiver(this);
    128                 mRegistered = false;
    129             }
    130         }
    131 
    132         @Override
    133         public void onReceive(Context context, Intent intent) {
    134             if (DEBUG) Log.d(TAG, "onReceive " + intent.getAction());
    135             int state = intent.getIntExtra(
    136                     WifiManager.EXTRA_WIFI_AP_STATE, WifiManager.WIFI_AP_STATE_FAILED);
    137             mHotspotState = state;
    138             fireCallback(mHotspotState == WifiManager.WIFI_AP_STATE_ENABLED);
    139         }
    140     }
    141 }
    142