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package com.king.zxing;
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/*
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* Copyright (C) 2012 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.hardware.Sensor;
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import android.hardware.SensorEvent;
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import android.hardware.SensorEventListener;
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import android.hardware.SensorManager;
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import android.preference.PreferenceManager;
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import com.king.zxing.camera.CameraManager;
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import com.king.zxing.camera.FrontLightMode;
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/**
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* Detects ambient light and switches on the front light when very dark, and off again when sufficiently light.
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*
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* @author Sean Owen
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* @author Nikolaus Huber
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*/
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final class AmbientLightManager implements SensorEventListener {
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protected static final float TOO_DARK_LUX = 45.0f;
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protected static final float BRIGHT_ENOUGH_LUX = 100.0f;
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/**
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* 光线太暗时，默认：照度45 lux
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*/
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private float tooDarkLux = TOO_DARK_LUX;
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/**
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* 光线足够亮时，默认：照度450 lux
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*/
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private float brightEnoughLux = BRIGHT_ENOUGH_LUX;
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private final Context context;
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private CameraManager cameraManager;
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private Sensor lightSensor;
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AmbientLightManager(Context context) {
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this.context = context;
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}
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void start(CameraManager cameraManager) {
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this.cameraManager = cameraManager;
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SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
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if (FrontLightMode.readPref(sharedPrefs) == FrontLightMode.AUTO) {
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SensorManager sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
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lightSensor = sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
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if (lightSensor != null) {
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sensorManager.registerListener(this, lightSensor, SensorManager.SENSOR_DELAY_NORMAL);
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}
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}
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}
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void stop() {
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if (lightSensor != null) {
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SensorManager sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
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sensorManager.unregisterListener(this);
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cameraManager = null;
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lightSensor = null;
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}
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}
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@Override
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public void onSensorChanged(SensorEvent sensorEvent) {
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float ambientLightLux = sensorEvent.values[0];
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if (cameraManager != null) {
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if (ambientLightLux <= tooDarkLux) {
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cameraManager.sensorChanged(true,ambientLightLux);
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} else if (ambientLightLux >= brightEnoughLux) {
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cameraManager.sensorChanged(false,ambientLightLux);
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}
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}
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}
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public void setTooDarkLux(float tooDarkLux){
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this.tooDarkLux = tooDarkLux;
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}
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public void setBrightEnoughLux(float brightEnoughLux){
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this.brightEnoughLux = brightEnoughLux;
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}
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@Override
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public void onAccuracyChanged(Sensor sensor, int accuracy) {
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// do nothing
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}
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} |