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/*
* 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.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Handler;
import com.journeyapps.barcodescanner.camera.CameraManager;
import com.journeyapps.barcodescanner.camera.CameraSettings;
/**
* Detects ambient light and switches on the front light when very dark, and off again when sufficiently light.
*
* @author Sean Owen
* @author Nikolaus Huber
*/
public final class AmbientLightManager implements SensorEventListener {
private static final float TOO_DARK_LUX = 45.0f;
private static final float BRIGHT_ENOUGH_LUX = 450.0f;
private CameraManager cameraManager;
private CameraSettings cameraSettings;
private Sensor lightSensor;
private Context context;
private Handler handler;
public AmbientLightManager(Context context, CameraManager cameraManager, CameraSettings settings) {
this.context = context;
this.cameraManager = cameraManager;
this.cameraSettings = settings;
this.handler = new Handler();
}
public void start() {
if (cameraSettings.isAutoTorchEnabled()) {
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);
}
}
}
public void stop() {
if (lightSensor != null) {
SensorManager sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
sensorManager.unregisterListener(this);
lightSensor = null;
}
}
private void setTorch(final boolean on) {
handler.post(() -> cameraManager.setTorch(on));
}
@Override
public void onSensorChanged(SensorEvent sensorEvent) {
float ambientLightLux = sensorEvent.values[0];
if (cameraManager != null) {
if (ambientLightLux <= TOO_DARK_LUX) {
setTorch(true);
} else if (ambientLightLux >= BRIGHT_ENOUGH_LUX) {
setTorch(false);
}
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// do nothing
}
}
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