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