google提供的zxing二维码识别demo在有些机型上拉伸非常严重，，可以通过设置SurfaceView全屏，并设置图片宽高比，预览宽高比与屏幕宽高比一致来解决，具体代码如下
只修改了CameraConfigurationManager中getCameraResolution(Camera.Parameters parameters, Point screenResolution)方法和setDesiredCameraParameters(Camera camera)
/* * Copyright (C) 2010 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 * * * * 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.yagou.yggx.android.qrcode;import android.content.Context;import android.graphics.Point;import android.hardware.Camera;import android.hardware.Camera.Size;import android.os.Build;import android.util.Log;import android.view.Display;import android.view.WindowManager;import java.lang.reflect.Method;import java.util.Collections;import java.util.Comparator;import java.util.List;import java.util.regex.Pattern;import com.baidu.platform.comapi.map.s;import com.yagou.yggx.android.utils.Toast;final class CameraConfigurationManager { private static final String TAG = CameraConfigurationManager.class.getSimpleName(); private static final int TEN_DESIRED_ZOOM = 27; private static final int DESIRED_SHARPNESS = 30; private static final Pattern COMMA_PATTERN = Pattern.compile(","); private final Context context; private Point screenResolution; private Point cameraResolution; private int previewFormat; private String previewFormatString; CameraConfigurationManager(Context context) {this.context = context; } /** * Reads, one time, values from the camera that are needed by the app. */ void initFromCameraParameters(Camera camera) {Camera.Parameters parameters = camera.getParameters();previewFormat = parameters.getPreviewFormat();previewFormatString = parameters.get("preview-format");Log.d(TAG, "Default preview format: " + previewFormat + '/' + previewFormatString);WindowManager manager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);Display display = manager.getDefaultDisplay();screenResolution = new Point(display.getWidth(), display.getHeight());Log.d(TAG, "Screen resolution: " + screenResolution);cameraResolution = getCameraResolution(parameters, screenResolution);Log.d(TAG, "Camera resolution: " + screenResolution); } /** * Sets the camera up to take preview images which are used for both preview and decoding. * We detect the preview format here so that buildLuminanceSource() can build an appropriate * LuminanceSource subclass. In the future we may want to force YUV420SP as it's the smallest, * and the planar Y can be used for barcode scanning without a copy in some cases. */ void setDesiredCameraParameters(Camera camera) {Camera.Parameters parameters = camera.getParameters();Log.d(TAG, "Setting preview size: " + cameraResolution);parameters.setPreviewSize(cameraResolution.x, cameraResolution.y);setFlash(parameters);setZoom(parameters);//setSharpness(parameters);//modify here// camera.setDisplayOrientation(90);//2.1setDisplayOrientation(camera, 90);camera.setParameters(parameters);Size pic=getPicSize(parameters.getSupportedPictureSizes(),1.0*cameraResolution.x/cameraResolution.y);parameters.setPictureSize(pic.width, pic.height);pic=parameters.getPictureSize();Size pre=parameters.getPreviewSize();Toast.showText(context, "pic "+pic.width+" "+pic.height+"\n pre "+pre.width+" "+pre.height, 1); }private Size getPicSize(List<Size> list, double d) {// TODO Auto-generated method stubCollections.sort(list, new Comparator<Size>() {@Overridepublic int compare(Size lhs, Size rhs) {// TODO Auto-generated method stubif (lhs.width-rhs.width==0) {return lhs.height-rhs.height;}return lhs.width-rhs.width;}}); for (Size size : list) {if (Math.abs(size.width*1.0/size.height-d)<0.03) {return size;}}return list.get(0);}Point getCameraResolution() {return cameraResolution; } Point getScreenResolution() {return screenResolution; } int getPreviewFormat() {return previewFormat; } String getPreviewFormatString() {return previewFormatString; } private static Point getCameraResolution(Camera.Parameters parameters, Point screenResolution) {System.out.println("pingmu "+screenResolution.x+" "+screenResolution.y); List<Size>list= parameters.getSupportedPreviewSizes(); Collections.sort(list, new Comparator<Size>() {@Overridepublic int compare(Size lhs, Size rhs) {// TODO Auto-generated method stubif (lhs.width-rhs.width==0) {return lhs.height-rhs.height;}return lhs.width-rhs.width;}}); for (Size size : list) {System.out.println(size.width+" "+size.height);if (Math.abs( size.width*1.0/size.height – 1.0*screenResolution.y/screenResolution.x )<0.1) {return new Point(size.width, size.height);} } return new Point(list.get(0).width, list.get(0).height);// String previewSizeValueString = parameters.get("preview-size-values");// // saw this on Xperia// if (previewSizeValueString == null) {//previewSizeValueString = parameters.get("preview-size-value");// }//// Point cameraResolution = null;//// if (previewSizeValueString != null) {//Log.d(TAG, "preview-size-values parameter: " + previewSizeValueString);//cameraResolution = findBestPreviewSizeValue(previewSizeValueString, screenResolution);// }//// if (cameraResolution == null) {//// Ensure that the camera resolution is a multiple of 8, as the screen may not be.//cameraResolution = new Point(//(screenResolution.x >> 3) << 3,//(screenResolution.y >> 3) << 3);// }//// return cameraResolution; } private static Point findBestPreviewSizeValue(CharSequence previewSizeValueString, Point screenResolution) {int bestX = 0;int bestY = 0;int diff = Integer.MAX_VALUE;for (String previewSize : COMMA_PATTERN.split(previewSizeValueString)) {previewSize = previewSize.trim();int dimPosition = previewSize.indexOf('x');if (dimPosition < 0) {Log.w(TAG, "Bad preview-size: " + previewSize);continue;}int newX;int newY;try {newX = Integer.parseInt(previewSize.substring(0, dimPosition));newY = Integer.parseInt(previewSize.substring(dimPosition + 1));} catch (NumberFormatException nfe) {Log.w(TAG, "Bad preview-size: " + previewSize);continue;}int newDiff = Math.abs(newX – screenResolution.x) + Math.abs(newY – screenResolution.y);if (newDiff == 0) {bestX = newX;bestY = newY;break;} else if (newDiff < diff) {bestX = newX;bestY = newY;diff = newDiff;}}if (bestX > 0 && bestY > 0) {return new Point(bestX, bestY);}return null; } private static int findBestMotZoomValue(CharSequence stringValues, int tenDesiredZoom) {int tenBestValue = 0;for (String stringValue : COMMA_PATTERN.split(stringValues)) {stringValue = stringValue.trim();double value;try {value = Double.parseDouble(stringValue);} catch (NumberFormatException nfe) {return tenDesiredZoom;}int tenValue = (int) (10.0 * value);if (Math.abs(tenDesiredZoom – value) < Math.abs(tenDesiredZoom – tenBestValue)) {tenBestValue = tenValue;}}return tenBestValue; } private void setFlash(Camera.Parameters parameters) {// FIXME: This is a hack to turn the flash off on the Samsung Galaxy.// And this is a hack-hack to work around a different value on the Behold II// Restrict Behold II check to Cupcake, per Samsung's advice//if (Build.MODEL.contains("Behold II") &&// CameraManager.SDK_INT == Build.VERSION_CODES.CUPCAKE) {if (Build.MODEL.contains("Behold II") && CameraManager.SDK_INT == 3) { // 3 = Cupcakeparameters.set("flash-value", 1);} else {parameters.set("flash-value", 2);}// This is the standard setting to turn the flash off that all devices should honor.parameters.set("flash-mode", "off"); } private void setZoom(Camera.Parameters parameters) {String zoomSupportedString = parameters.get("zoom-supported");if (zoomSupportedString != null && !Boolean.parseBoolean(zoomSupportedString)) {return;}int tenDesiredZoom = TEN_DESIRED_ZOOM;String maxZoomString = parameters.get("max-zoom");if (maxZoomString != null) {try {int tenMaxZoom = (int) (10.0 * Double.parseDouble(maxZoomString));if (tenDesiredZoom > tenMaxZoom) {tenDesiredZoom = tenMaxZoom;}} catch (NumberFormatException nfe) {Log.w(TAG, "Bad max-zoom: " + maxZoomString);}}String takingPictureZoomMaxString = parameters.get("taking-picture-zoom-max");if (takingPictureZoomMaxString != null) {try {int tenMaxZoom = Integer.parseInt(takingPictureZoomMaxString);if (tenDesiredZoom > tenMaxZoom) {tenDesiredZoom = tenMaxZoom;}} catch (NumberFormatException nfe) {Log.w(TAG, "Bad taking-picture-zoom-max: " + takingPictureZoomMaxString);}}String motZoomValuesString = parameters.get("mot-zoom-values");if (motZoomValuesString != null) {tenDesiredZoom = findBestMotZoomValue(motZoomValuesString, tenDesiredZoom);}String motZoomStepString = parameters.get("mot-zoom-step");if (motZoomStepString != null) {try {double motZoomStep = Double.parseDouble(motZoomStepString.trim());int tenZoomStep = (int) (10.0 * motZoomStep);if (tenZoomStep > 1) {tenDesiredZoom -= tenDesiredZoom % tenZoomStep;}} catch (NumberFormatException nfe) {// continue}}// Set zoom. This helps encourage the user to pull back.// Some devices like the Behold have a zoom parameterif (maxZoomString != null || motZoomValuesString != null) {parameters.set("zoom", String.valueOf(tenDesiredZoom / 10.0));}// Most devices, like the Hero, appear to expose this zoom parameter.// It takes on values like "27" which appears to mean 2.7x zoomif (takingPictureZoomMaxString != null) {parameters.set("taking-picture-zoom", tenDesiredZoom);} }public static int getDesiredSharpness() {return DESIRED_SHARPNESS;}/** * compatible 1.6 * @param camera * @param angle */protected void setDisplayOrientation(Camera camera, int angle){Method downPolymorphic;try{downPolymorphic = camera.getClass().getMethod("setDisplayOrientation", new Class[] { int.class });if (downPolymorphic != null)downPolymorphic.invoke(camera, new Object[] { angle });}catch (Exception e1){}} }
版权声明：本文为博主原创文章，未经博主允许不得转载。
醒来第一眼看见的是他，然后倒头继续睡。这就是我想要的幸福。
