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     /**
37      * Returns milliseconds since boot, not counting time spent in deep sleep.
38      * <b>Note:</b> This value may get reset occasionally (before it would
39      * otherwise wrap around).
40      *
41      * @return milliseconds of non-sleep uptime since boot.
42      */
43     @LayoutlibDelegate
uptimeMillis()44     /*package*/ static long uptimeMillis() {
45         return System.currentTimeMillis() - sBootTime;
46     }
47 
48     /**
49      * Returns milliseconds since boot, including time spent in sleep.
50      *
51      * @return elapsed milliseconds since boot.
52      */
53     @LayoutlibDelegate
elapsedRealtime()54     /*package*/ static long elapsedRealtime() {
55         return System.currentTimeMillis() - sBootTime;
56     }
57 
58     /**
59      * Returns nanoseconds since boot, including time spent in sleep.
60      *
61      * @return elapsed nanoseconds since boot.
62      */
63     @LayoutlibDelegate
elapsedRealtimeNanos()64     /*package*/ static long elapsedRealtimeNanos() {
65         return System.nanoTime() - sBootTimeNano;
66     }
67 
68     /**
69      * Returns milliseconds running in the current thread.
70      *
71      * @return elapsed milliseconds in the thread
72      */
73     @LayoutlibDelegate
currentThreadTimeMillis()74     /*package*/ static long currentThreadTimeMillis() {
75         return System.currentTimeMillis();
76     }
77 
78     /**
79      * Returns microseconds running in the current thread.
80      *
81      * @return elapsed microseconds in the thread
82      *
83      * @hide
84      */
85     @LayoutlibDelegate
currentThreadTimeMicro()86     /*package*/ static long currentThreadTimeMicro() {
87         return System.currentTimeMillis() * 1000;
88     }
89 
90     /**
91      * Returns current wall time in  microseconds.
92      *
93      * @return elapsed microseconds in wall time
94      *
95      * @hide
96      */
97     @LayoutlibDelegate
currentTimeMicro()98     /*package*/ static long currentTimeMicro() {
99         return elapsedRealtime() * 1000;
100     }
101 }
102