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      1 /*
      2  * Copyright (C) 2015 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.server.telecom;
     18 
     19 import android.app.UiModeManager;
     20 import android.content.BroadcastReceiver;
     21 import android.content.Context;
     22 import android.content.Intent;
     23 import android.content.IntentFilter;
     24 import android.content.res.Configuration;
     25 import android.telecom.Log;
     26 
     27 import java.util.Set;
     28 import java.util.concurrent.CopyOnWriteArraySet;
     29 
     30 /**
     31  * Provides various system states to the rest of the telecom codebase. So far, that's only car-mode.
     32  */
     33 public class SystemStateProvider {
     34 
     35     public static interface SystemStateListener {
     36         public void onCarModeChanged(boolean isCarMode);
     37     }
     38 
     39     private final Context mContext;
     40     private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
     41         @Override
     42         public void onReceive(Context context, Intent intent) {
     43             Log.startSession("SSP.oR");
     44             try {
     45                 String action = intent.getAction();
     46                 if (UiModeManager.ACTION_ENTER_CAR_MODE.equals(action)) {
     47                     onEnterCarMode();
     48                 } else if (UiModeManager.ACTION_EXIT_CAR_MODE.equals(action)) {
     49                     onExitCarMode();
     50                 } else {
     51                     Log.w(this, "Unexpected intent received: %s", intent.getAction());
     52                 }
     53             } finally {
     54                 Log.endSession();
     55             }
     56         }
     57     };
     58 
     59     private Set<SystemStateListener> mListeners = new CopyOnWriteArraySet<>();
     60     private boolean mIsCarMode;
     61 
     62     public SystemStateProvider(Context context) {
     63         mContext = context;
     64 
     65         IntentFilter intentFilter = new IntentFilter(UiModeManager.ACTION_ENTER_CAR_MODE);
     66         intentFilter.addAction(UiModeManager.ACTION_EXIT_CAR_MODE);
     67         mContext.registerReceiver(mBroadcastReceiver, intentFilter);
     68         Log.i(this, "Registering car mode receiver: %s", intentFilter);
     69 
     70         mIsCarMode = getSystemCarMode();
     71     }
     72 
     73     public void addListener(SystemStateListener listener) {
     74         if (listener != null) {
     75             mListeners.add(listener);
     76         }
     77     }
     78 
     79     public boolean removeListener(SystemStateListener listener) {
     80         return mListeners.remove(listener);
     81     }
     82 
     83     public boolean isCarMode() {
     84         return mIsCarMode;
     85     }
     86 
     87     private void onEnterCarMode() {
     88         if (!mIsCarMode) {
     89             Log.i(this, "Entering carmode");
     90             mIsCarMode = true;
     91             notifyCarMode();
     92         }
     93     }
     94 
     95     private void onExitCarMode() {
     96         if (mIsCarMode) {
     97             Log.i(this, "Exiting carmode");
     98             mIsCarMode = false;
     99             notifyCarMode();
    100         }
    101     }
    102 
    103     private void notifyCarMode() {
    104         for (SystemStateListener listener : mListeners) {
    105             listener.onCarModeChanged(mIsCarMode);
    106         }
    107     }
    108 
    109     /**
    110      * Checks the system for the current car mode.
    111      *
    112      * @return True if in car mode, false otherwise.
    113      */
    114     private boolean getSystemCarMode() {
    115         UiModeManager uiModeManager =
    116                 (UiModeManager) mContext.getSystemService(Context.UI_MODE_SERVICE);
    117 
    118         if (uiModeManager != null) {
    119             return uiModeManager.getCurrentModeType() == Configuration.UI_MODE_TYPE_CAR;
    120         }
    121 
    122         return false;
    123     }
    124 }
    125