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The source code is released under:
GNU General Public License
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/* * Copyright (C) 2012 ZXing authors/*w w w . ja v a 2 s . c om*/ * * 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.camera.exposure; import android.annotation.TargetApi; import android.hardware.Camera; import android.util.Log; @TargetApi(8) public final class FroyoExposureInterface implements ExposureInterface { private static final String TAG = FroyoExposureInterface.class.getSimpleName(); private static final float MAX_EXPOSURE_COMPENSATION = 1.5f; private static final float MIN_EXPOSURE_COMPENSATION = 0.0f; @Override public void setExposure(Camera.Parameters parameters, boolean lightOn) { int minExposure = parameters.getMinExposureCompensation(); int maxExposure = parameters.getMaxExposureCompensation(); if (minExposure != 0 || maxExposure != 0) { float step = parameters.getExposureCompensationStep(); int desiredCompensation; if (lightOn) { // Light on; set low exposue compensation desiredCompensation = Math.max((int) (MIN_EXPOSURE_COMPENSATION / step), minExposure); } else { // Light off; set high compensation desiredCompensation = Math.min((int) (MAX_EXPOSURE_COMPENSATION / step), maxExposure); } Log.i(TAG, "Setting exposure compensation to " + desiredCompensation + " / " + (step * desiredCompensation)); parameters.setExposureCompensation(desiredCompensation); } else { Log.i(TAG, "Camera does not support exposure compensation"); } } }