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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 android.app;
     18 
     19 import android.annotation.NonNull;
     20 import android.content.ComponentName;
     21 
     22 /**
     23  * Activity manager local system service interface.
     24  *
     25  * @hide Only for use within the system server.
     26  */
     27 public abstract class ActivityManagerInternal {
     28     // Called by the power manager.
     29     public abstract void onWakefulnessChanged(int wakefulness);
     30 
     31     public abstract int startIsolatedProcess(String entryPoint, String[] mainArgs,
     32             String processName, String abiOverride, int uid, Runnable crashHandler);
     33 
     34     /**
     35      * Acquires a sleep token with the specified tag.
     36      *
     37      * @param tag A string identifying the purpose of the token (eg. "Dream").
     38      */
     39     public abstract SleepToken acquireSleepToken(@NonNull String tag);
     40 
     41     /**
     42      * Sleep tokens cause the activity manager to put the top activity to sleep.
     43      * They are used by components such as dreams that may hide and block interaction
     44      * with underlying activities.
     45      */
     46     public static abstract class SleepToken {
     47         /**
     48          * Releases the sleep token.
     49          */
     50         public abstract void release();
     51     }
     52 
     53     /**
     54      * Returns home activity for the specified user.
     55      * @param userId ID of the user or {@link android.os.UserHandle#USER_ALL}
     56      */
     57     public abstract ComponentName getHomeActivityForUser(int userId);
     58 }
     59