blob: 20742658808f8f33e89c9627f7b18f7ff0ef1dd1 (
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
|
/*
* Copyright (C) 2012 ZXing authors
*
* 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.google.zxing.client.android;
import android.content.Context;
import android.content.SharedPreferences;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.preference.PreferenceManager;
import com.google.zxing.client.android.camera.CameraManager;
import com.google.zxing.client.android.camera.FrontLightMode;
/**
* Detects ambient light and switches on the front light when very dark, and off again when sufficiently light.
*
* @author Sean Owen
* @author Nikolaus Huber
*/
final class AmbientLightManager implements SensorEventListener {
private static final float TOO_DARK_LUX = 45.0f;
private static final float BRIGHT_ENOUGH_LUX = 450.0f;
private final Context context;
private CameraManager cameraManager;
private Sensor lightSensor;
AmbientLightManager(Context context) {
this.context = context;
}
void start(CameraManager cameraManager) {
this.cameraManager = cameraManager;
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
if (FrontLightMode.readPref(sharedPrefs) == FrontLightMode.AUTO) {
SensorManager sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
lightSensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
if (lightSensor != null) {
sensorManager.registerListener(this, lightSensor, SensorManager.SENSOR_DELAY_NORMAL);
}
}
}
void stop() {
if (lightSensor != null) {
SensorManager sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
sensorManager.unregisterListener(this);
cameraManager = null;
lightSensor = null;
}
}
@Override
public void onSensorChanged(SensorEvent sensorEvent) {
float ambientLightLux = sensorEvent.values[0];
if (cameraManager != null) {
if (ambientLightLux <= TOO_DARK_LUX) {
cameraManager.setTorch(true);
} else if (ambientLightLux >= BRIGHT_ENOUGH_LUX) {
cameraManager.setTorch(false);
}
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// do nothing
}
}
|
