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      1 /*
      2  * Copyright (C) 2012 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 android.service.dreams;
     18 
     19 import android.content.ComponentName;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.os.PowerManager;
     23 import android.os.RemoteException;
     24 import android.os.ServiceManager;
     25 import android.os.SystemClock;
     26 import android.os.UserHandle;
     27 import android.provider.Settings;
     28 import android.util.Slog;
     29 
     30 /**
     31  * Internal helper for launching dreams to ensure consistency between the
     32  * <code>UiModeManagerService</code> system service and the <code>Somnambulator</code> activity.
     33  *
     34  * @hide
     35  */
     36 public final class Sandman {
     37     private static final String TAG = "Sandman";
     38 
     39     // The component name of a special dock app that merely launches a dream.
     40     // We don't want to launch this app when docked because it causes an unnecessary
     41     // activity transition.  We just want to start the dream.
     42     private static final ComponentName SOMNAMBULATOR_COMPONENT =
     43             new ComponentName("com.android.systemui", "com.android.systemui.Somnambulator");
     44 
     45 
     46     // The sandman is eternal.  No one instantiates him.
     47     private Sandman() {
     48     }
     49 
     50     /**
     51      * Returns true if the specified dock app intent should be started.
     52      * False if we should dream instead, if appropriate.
     53      */
     54     public static boolean shouldStartDockApp(Context context, Intent intent) {
     55         ComponentName name = intent.resolveActivity(context.getPackageManager());
     56         return name != null && !name.equals(SOMNAMBULATOR_COMPONENT);
     57     }
     58 
     59     /**
     60      * Starts a dream manually.
     61      */
     62     public static void startDreamByUserRequest(Context context) {
     63         startDream(context, false);
     64     }
     65 
     66     /**
     67      * Starts a dream when docked if the system has been configured to do so,
     68      * otherwise does nothing.
     69      */
     70     public static void startDreamWhenDockedIfAppropriate(Context context) {
     71         if (!isScreenSaverEnabled(context)
     72                 || !isScreenSaverActivatedOnDock(context)) {
     73             Slog.i(TAG, "Dreams currently disabled for docks.");
     74             return;
     75         }
     76 
     77         startDream(context, true);
     78     }
     79 
     80     private static void startDream(Context context, boolean docked) {
     81         try {
     82             IDreamManager dreamManagerService = IDreamManager.Stub.asInterface(
     83                     ServiceManager.getService(DreamService.DREAM_SERVICE));
     84             if (dreamManagerService != null && !dreamManagerService.isDreaming()) {
     85                 if (docked) {
     86                     Slog.i(TAG, "Activating dream while docked.");
     87 
     88                     // Wake up.
     89                     // The power manager will wake up the system automatically when it starts
     90                     // receiving power from a dock but there is a race between that happening
     91                     // and the UI mode manager starting a dream.  We want the system to already
     92                     // be awake by the time this happens.  Otherwise the dream may not start.
     93                     PowerManager powerManager =
     94                             (PowerManager)context.getSystemService(Context.POWER_SERVICE);
     95                     powerManager.wakeUp(SystemClock.uptimeMillis(),
     96                             "android.service.dreams:DREAM");
     97                 } else {
     98                     Slog.i(TAG, "Activating dream by user request.");
     99                 }
    100 
    101                 // Dream.
    102                 dreamManagerService.dream();
    103             }
    104         } catch (RemoteException ex) {
    105             Slog.e(TAG, "Could not start dream when docked.", ex);
    106         }
    107     }
    108 
    109     private static boolean isScreenSaverEnabled(Context context) {
    110         int def = context.getResources().getBoolean(
    111                 com.android.internal.R.bool.config_dreamsEnabledByDefault) ? 1 : 0;
    112         return Settings.Secure.getIntForUser(context.getContentResolver(),
    113                 Settings.Secure.SCREENSAVER_ENABLED, def,
    114                 UserHandle.USER_CURRENT) != 0;
    115     }
    116 
    117     private static boolean isScreenSaverActivatedOnDock(Context context) {
    118         int def = context.getResources().getBoolean(
    119                 com.android.internal.R.bool.config_dreamsActivatedOnDockByDefault) ? 1 : 0;
    120         return Settings.Secure.getIntForUser(context.getContentResolver(),
    121                 Settings.Secure.SCREENSAVER_ACTIVATE_ON_DOCK, def,
    122                 UserHandle.USER_CURRENT) != 0;
    123     }
    124 }
    125