blob: b63f15d53ff7f4a0c7b70a8332399f75bde9a3ba (
plain)
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
|
/*
* Copyright (C) 2015 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 com.android.incallui.answer.impl.classifier;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.view.MotionEvent;
import java.util.concurrent.TimeUnit;
/**
* A classifier which looks at the proximity sensor during the gesture. It calculates the percentage
* the proximity sensor showing the near state during the whole gesture
*/
class ProximityClassifier extends GestureClassifier {
private long gestureStartTimeNano;
private long nearStartTimeNano;
private long nearDuration;
private boolean near;
private float averageNear;
public ProximityClassifier(ClassifierData classifierData) {}
@Override
public String getTag() {
return "PROX";
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_PROXIMITY) {
update(event.values[0] < event.sensor.getMaximumRange(), event.timestamp);
}
}
@Override
public void onTouchEvent(MotionEvent event) {
int action = event.getActionMasked();
if (action == MotionEvent.ACTION_DOWN) {
gestureStartTimeNano = TimeUnit.MILLISECONDS.toNanos(event.getEventTime());
nearStartTimeNano = TimeUnit.MILLISECONDS.toNanos(event.getEventTime());
nearDuration = 0;
}
if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
update(near, TimeUnit.MILLISECONDS.toNanos(event.getEventTime()));
long duration = TimeUnit.MILLISECONDS.toNanos(event.getEventTime()) - gestureStartTimeNano;
if (duration == 0) {
averageNear = near ? 1.0f : 0.0f;
} else {
averageNear = (float) nearDuration / (float) duration;
}
}
}
/**
* @param near is the sensor showing the near state right now
* @param timestampNano time of this event in nanoseconds
*/
private void update(boolean near, long timestampNano) {
// This if is necessary because MotionEvents and SensorEvents do not come in
// chronological order
if (timestampNano > nearStartTimeNano) {
// if the state before was near then add the difference of the current time and
// mNearStartTimeNano to mNearDuration.
if (this.near) {
nearDuration += timestampNano - nearStartTimeNano;
}
// if the new state is near, set mNearStartTimeNano equal to this moment.
if (near) {
nearStartTimeNano = timestampNano;
}
}
this.near = near;
}
@Override
public float getFalseTouchEvaluation() {
return ProximityEvaluator.evaluate(averageNear);
}
}
|
