1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.os.health;
import android.content.Context;
import android.os.BatteryStats;
import android.os.Process;
import android.os.RemoteException;
import android.os.ServiceManager;
import com.android.internal.app.IBatteryStats;
/**
* Provides access to data about how various system resources are used by applications.
* @more
* <p>
* If you are going to be using this class to log your application's resource usage,
* please consider the amount of resources (battery, network, etc) that will be used
* by the logging itself. It can be substantial.
* <p>
* <b>Battery Usage</b><br>
* The statistics related to power (battery) usage are recorded since the device
* was last unplugged. It is expected that applications schedule more work to do
* while the device is plugged in (e.g. using {@link android.app.job.JobScheduler
* JobScheduler}), and while that can affect charging rates, it is still preferable
* to actually draining the battery.
*/
public class SystemHealthManager {
private final IBatteryStats mBatteryStats;
/**
* Construct a new SystemHealthManager object.
* @hide
*/
public SystemHealthManager() {
mBatteryStats = IBatteryStats.Stub.asInterface(
ServiceManager.getService(BatteryStats.SERVICE_NAME));
}
/**
* Obtain a SystemHealthManager object for the supplied context.
*
* @hide
*/
public static SystemHealthManager from(Context context) {
return (SystemHealthManager)context.getSystemService(Context.SYSTEM_HEALTH_SERVICE);
}
/**
* Return a {@link HealthStats} object containing a snapshot of system health
* metrics for the given uid (user-id, which in usually corresponds to application).
* @more
*
* An application must hold the {@link android.Manifest.permission#BATTERY_STATS
* android.permission.BATTERY_STATS} permission in order to retrieve any HealthStats
* other than its own.
*
* @param uid User ID for a given application.
* @return A {@link HealthStats} object containing the metrics for the requested
* application. The keys for this HealthStats object will be from the {@link UidHealthStats}
* class.
* @see Process#myUid() Process.myUid()
*/
public HealthStats takeUidSnapshot(int uid) {
try {
final HealthStatsParceler parceler = mBatteryStats.takeUidSnapshot(uid);
return parceler.getHealthStats();
} catch (RemoteException ex) {
throw new RuntimeException(ex);
}
}
/**
* Return a {@link HealthStats} object containing a snapshot of system health
* metrics for the application calling this API. This method is the same as calling
* {@code takeUidSnapshot(Process.myUid())}.
*
* @return A {@link HealthStats} object containing the metrics for this application. The keys
* for this HealthStats object will be from the {@link UidHealthStats} class.
*/
public HealthStats takeMyUidSnapshot() {
return takeUidSnapshot(Process.myUid());
}
/**
* Return a {@link HealthStats} object containing a snapshot of system health
* metrics for the given uids (user-id, which in usually corresponds to application).
* @more
*
* An application must hold the {@link android.Manifest.permission#BATTERY_STATS
* android.permission.BATTERY_STATS} permission in order to retrieve any HealthStats
* other than its own.
*
* @param uids An array of User IDs to retrieve.
* @return An array of {@link HealthStats} objects containing the metrics for each of
* the requested uids. The keys for this HealthStats object will be from the
* {@link UidHealthStats} class.
*/
public HealthStats[] takeUidSnapshots(int[] uids) {
try {
final HealthStatsParceler[] parcelers = mBatteryStats.takeUidSnapshots(uids);
final HealthStats[] results = new HealthStats[uids.length];
final int N = uids.length;
for (int i=0; i<N; i++) {
results[i] = parcelers[i].getHealthStats();
}
return results;
} catch (RemoteException ex) {
throw new RuntimeException(ex);
}
}
}
|
