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      1 /*
      2  * Copyright (C) 2010 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.os;
     18 
     19 import com.android.layoutlib.bridge.impl.DelegateManager;
     20 import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
     21 
     22 /**
     23  * Delegate implementing the native methods of android.os.SystemClock
     24  *
     25  * Through the layoutlib_create tool, the original native methods of SystemClock have been replaced
     26  * by calls to methods of the same name in this delegate class.
     27  *
     28  * Because it's a stateless class to start with, there's no need to keep a {@link DelegateManager}
     29  * around to map int to instance of the delegate.
     30  *
     31  */
     32 public class SystemClock_Delegate {
     33     private static long sBootTime = System.currentTimeMillis();
     34     private static long sBootTimeNano = System.nanoTime();
     35 
     36     @LayoutlibDelegate
     37     /*package*/ static boolean setCurrentTimeMillis(long millis) {
     38         return true;
     39     }
     40 
     41     /**
     42      * Returns milliseconds since boot, not counting time spent in deep sleep.
     43      * <b>Note:</b> This value may get reset occasionally (before it would
     44      * otherwise wrap around).
     45      *
     46      * @return milliseconds of non-sleep uptime since boot.
     47      */
     48     @LayoutlibDelegate
     49     /*package*/ static long uptimeMillis() {
     50         return System.currentTimeMillis() - sBootTime;
     51     }
     52 
     53     /**
     54      * Returns milliseconds since boot, including time spent in sleep.
     55      *
     56      * @return elapsed milliseconds since boot.
     57      */
     58     @LayoutlibDelegate
     59     /*package*/ static long elapsedRealtime() {
     60         return System.currentTimeMillis() - sBootTime;
     61     }
     62 
     63     /**
     64      * Returns nanoseconds since boot, including time spent in sleep.
     65      *
     66      * @return elapsed nanoseconds since boot.
     67      */
     68     @LayoutlibDelegate
     69     /*package*/ static long elapsedRealtimeNanos() {
     70         return System.nanoTime() - sBootTimeNano;
     71     }
     72 
     73     /**
     74      * Returns milliseconds running in the current thread.
     75      *
     76      * @return elapsed milliseconds in the thread
     77      */
     78     @LayoutlibDelegate
     79     /*package*/ static long currentThreadTimeMillis() {
     80         return System.currentTimeMillis();
     81     }
     82 
     83     /**
     84      * Returns microseconds running in the current thread.
     85      *
     86      * @return elapsed microseconds in the thread
     87      *
     88      * @hide
     89      */
     90     @LayoutlibDelegate
     91     /*package*/ static long currentThreadTimeMicro() {
     92         return System.currentTimeMillis() * 1000;
     93     }
     94 
     95     /**
     96      * Returns current wall time in  microseconds.
     97      *
     98      * @return elapsed microseconds in wall time
     99      *
    100      * @hide
    101      */
    102     @LayoutlibDelegate
    103     /*package*/ static long currentTimeMicro() {
    104         return elapsedRealtime() * 1000;
    105     }
    106 }
    107