package com.zxing.scanner.decode;
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import android.graphics.Bitmap;
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import android.graphics.BitmapFactory;
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import com.google.zxing.BarcodeFormat;
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import com.google.zxing.BinaryBitmap;
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import com.google.zxing.ChecksumException;
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import com.google.zxing.DecodeHintType;
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import com.google.zxing.FormatException;
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import com.google.zxing.NotFoundException;
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import com.google.zxing.RGBLuminanceSource;
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import com.google.zxing.Result;
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import com.google.zxing.common.GlobalHistogramBinarizer;
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import com.google.zxing.qrcode.QRCodeReader;
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import com.zxing.scanner.OnScannerCompletionListener;
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import com.zxing.scanner.camera.CameraManager;
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import java.io.FileNotFoundException;
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import java.util.ArrayList;
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import java.util.EnumMap;
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import java.util.List;
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import java.util.Map;
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/**
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* Created by hupei on 2016/7/7.
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*/
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public final class QRDecode {
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public static final Map<DecodeHintType, Object> HINTS = new EnumMap<>(DecodeHintType.class);
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static {
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List<BarcodeFormat> formats = new ArrayList<BarcodeFormat>();
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formats.add(BarcodeFormat.QR_CODE);
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HINTS.put(DecodeHintType.POSSIBLE_FORMATS, formats);
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HINTS.put(DecodeHintType.CHARACTER_SET, "utf-8");
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}
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private QRDecode() {
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}
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/**
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* 解析二维码图片
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* @param picturePath
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* @param listener
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* @return
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*/
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public static void decodeQR(String picturePath, OnScannerCompletionListener listener) {
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try {
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decodeQR(loadBitmap(picturePath), listener);
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} catch (FileNotFoundException e) {
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e.printStackTrace();
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}
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}
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/**
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* 解析二维码图片
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*
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* @param srcBitmap
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* @param listener
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* @return
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*/
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public static void decodeQR(Bitmap srcBitmap, final OnScannerCompletionListener listener) {
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Result result = null;
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if (srcBitmap != null) {
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int width = srcBitmap.getWidth();
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int height = srcBitmap.getHeight();
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int[] pixels = new int[width * height];
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srcBitmap.getPixels(pixels, 0, width, 0, 0, width, height);
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//新建一个RGBLuminanceSource对象
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RGBLuminanceSource source = new RGBLuminanceSource(width, height, pixels);
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//将图片转换成二进制图片
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BinaryBitmap binaryBitmap = new BinaryBitmap(new GlobalHistogramBinarizer(source));
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QRCodeReader reader = new QRCodeReader();//初始化解析对象
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try {
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result = reader.decode(binaryBitmap, HINTS);//开始解析
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} catch (NotFoundException e) {
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e.printStackTrace();
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} catch (ChecksumException e) {
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e.printStackTrace();
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} catch (FormatException e) {
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e.printStackTrace();
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}
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}
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if (listener != null) {
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listener.onScannerCompletion(result, srcBitmap);
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}
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}
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private static Bitmap loadBitmap(String picturePath) throws FileNotFoundException {
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BitmapFactory.Options opt = new BitmapFactory.Options();
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opt.inJustDecodeBounds = true;
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Bitmap bitmap = BitmapFactory.decodeFile(picturePath, opt);
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// 获取到这个图片的原始宽度和高度
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int picWidth = opt.outWidth;
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int picHeight = opt.outHeight;
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// 获取画布中间方框的宽度和高度
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int screenWidth = CameraManager.MAX_FRAME_WIDTH;
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int screenHeight = CameraManager.MAX_FRAME_HEIGHT;
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// isSampleSize是表示对图片的缩放程度，比如值为2图片的宽度和高度都变为以前的1/2
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opt.inSampleSize = 1;
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// 根据屏的大小和图片大小计算出缩放比例
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if (picWidth > picHeight) {
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if (picWidth > screenWidth)
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opt.inSampleSize = picWidth / screenWidth;
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} else {
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if (picHeight > screenHeight)
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opt.inSampleSize = picHeight / screenHeight;
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}
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// 生成有像素经过缩放了的bitmap
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opt.inJustDecodeBounds = false;
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bitmap = BitmapFactory.decodeFile(picturePath, opt);
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if (bitmap == null) {
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throw new FileNotFoundException("Couldn't open " + picturePath);
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}
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return bitmap;
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}
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}
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