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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
/*
* Copyright (C) 2009 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.phone;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
/**
* This class is used to listen to the accelerometer to monitor the
* orientation of the phone. The client of this class is notified when
* the orientation changes between horizontal and vertical.
*/
public final class AccelerometerListener {
private static final String TAG = "AccelerometerListener";
private static final boolean DEBUG = true;
private static final boolean VDEBUG = false;
private SensorManager mSensorManager;
private Sensor mSensor;
// mOrientation is the orientation value most recently reported to the client.
private int mOrientation;
// mPendingOrientation is the latest orientation computed based on the sensor value.
// This is sent to the client after a rebounce delay, at which point it is copied to
// mOrientation.
private int mPendingOrientation;
private OrientationListener mListener;
// Device orientation
public static final int ORIENTATION_UNKNOWN = 0;
public static final int ORIENTATION_VERTICAL = 1;
public static final int ORIENTATION_HORIZONTAL = 2;
private static final int ORIENTATION_CHANGED = 1234;
private static final int VERTICAL_DEBOUNCE = 100;
private static final int HORIZONTAL_DEBOUNCE = 500;
private static final double VERTICAL_ANGLE = 50.0;
public interface OrientationListener {
public void orientationChanged(int orientation);
}
public AccelerometerListener(Context context, OrientationListener listener) {
mListener = listener;
mSensorManager = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
}
public void enable(boolean enable) {
if (DEBUG) Log.d(TAG, "enable(" + enable + ")");
synchronized (this) {
if (enable) {
mOrientation = ORIENTATION_UNKNOWN;
mPendingOrientation = ORIENTATION_UNKNOWN;
mSensorManager.registerListener(mSensorListener, mSensor,
SensorManager.SENSOR_DELAY_NORMAL);
} else {
mSensorManager.unregisterListener(mSensorListener);
mHandler.removeMessages(ORIENTATION_CHANGED);
}
}
}
private void setOrientation(int orientation) {
synchronized (this) {
if (mPendingOrientation == orientation) {
// Pending orientation has not changed, so do nothing.
return;
}
// Cancel any pending messages.
// We will either start a new timer or cancel alltogether
// if the orientation has not changed.
mHandler.removeMessages(ORIENTATION_CHANGED);
if (mOrientation != orientation) {
// Set timer to send an event if the orientation has changed since its
// previously reported value.
mPendingOrientation = orientation;
Message m = mHandler.obtainMessage(ORIENTATION_CHANGED);
// set delay to our debounce timeout
int delay = (orientation == ORIENTATION_VERTICAL ? VERTICAL_DEBOUNCE
: HORIZONTAL_DEBOUNCE);
mHandler.sendMessageDelayed(m, delay);
} else {
// no message is pending
mPendingOrientation = ORIENTATION_UNKNOWN;
}
}
}
private void onSensorEvent(double x, double y, double z) {
if (VDEBUG) Log.d(TAG, "onSensorEvent(" + x + ", " + y + ", " + z + ")");
// If some values are exactly zero, then likely the sensor is not powered up yet.
// ignore these events to avoid false horizontal positives.
if (x == 0.0 || y == 0.0 || z == 0.0) return;
// magnitude of the acceleration vector projected onto XY plane
double xy = Math.sqrt(x*x + y*y);
// compute the vertical angle
double angle = Math.atan2(xy, z);
// convert to degrees
angle = angle * 180.0 / Math.PI;
int orientation = (angle > VERTICAL_ANGLE ? ORIENTATION_VERTICAL : ORIENTATION_HORIZONTAL);
if (VDEBUG) Log.d(TAG, "angle: " + angle + " orientation: " + orientation);
setOrientation(orientation);
}
SensorEventListener mSensorListener = new SensorEventListener() {
public void onSensorChanged(SensorEvent event) {
onSensorEvent(event.values[0], event.values[1], event.values[2]);
}
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// ignore
}
};
Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case ORIENTATION_CHANGED:
synchronized (this) {
mOrientation = mPendingOrientation;
if (DEBUG) {
Log.d(TAG, "orientation: " +
(mOrientation == ORIENTATION_HORIZONTAL ? "horizontal"
: (mOrientation == ORIENTATION_VERTICAL ? "vertical"
: "unknown")));
}
mListener.orientationChanged(mOrientation);
}
break;
}
}
};
}
|
