Android使用Zxing解析二維碼圖片

這里省去導入相應的Zxing 的jar包，直接上一個類和調用示例

除了jar包，這里還要用到一個類就是

/*
 * Copyright 2009 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 ;

import java.io.FileNotFoundException;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import com.google.zxing.LuminanceSource;

/**
 * This class is used to help decode images from files which arrive as RGB data
 * from Android bitmaps. It does not support cropping or rotation.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class RGBLuminanceSource extends LuminanceSource {
    private final byte[] luminances;

    public RGBLuminanceSource(String path) throws FileNotFoundException {
        this(loadBitmap(path));
    }

    public RGBLuminanceSource(Bitmap bitmap) {
        super(bitmap.getWidth(), bitmap.getHeight());
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        int[] pixels = new int[width * height];
        bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
        // In order to measure pure decoding speed, we convert the entire image
        // to a greyscale array
        // up front, which is the same as the Y channel of the
        // YUVLuminanceSource in the real app.
        luminances = new byte[width * height];
        for (int y = 0; y < height; y++) {
            int offset = y * width;
            for (int x = 0; x < width; x++) {
                int pixel = pixels[offset + x];
                int r = (pixel >> 16) & 0xff;
                int g = (pixel >> 8) & 0xff;
                int b = pixel & 0xff;
                if (r == g && g == b) {
                    // Image is already greyscale, so pick any channel.
                    luminances[offset + x] = (byte) r;
                } else {
                    // Calculate luminance cheaply, favoring green.
                    luminances[offset + x] = (byte) ((r + g + g + b) >> 2);
                }
            }
        }
    }

    @Override
    public byte[] getRow(int y, byte[] row) {
        if (y < 0 || y >= getHeight()) {
            throw new IllegalArgumentException(
                    "Requested row is outside the image: " + y);
        }
        int width = getWidth();
        if (row == null || row.length < width) {
            row = new byte[width];
        }
        System.arraycopy(luminances, y * width, row, 0, width);
        return row;
    }

    // Since this class does not support cropping, the underlying byte array
    // already contains
    // exactly what the caller is asking for, so give it to them without a copy.
    @Override
    public byte[] getMatrix() {
        return luminances;
    }

    private static Bitmap loadBitmap(String path) throws FileNotFoundException {
        Bitmap bitmap = BitmapFactory.decodeFile(path);
        if (bitmap == null) {
            throw new FileNotFoundException("Couldn't open " + path);
        }
        return bitmap;
    }
}

調用示例

public void handleQRCodeFormPhoto(Bitmap bitmap) {
                // TODO Auto-generated method stub

                Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
                hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
                Bitmap bitmap = ((BitmapDrawable)imgView.getDrawable()).getBitmap();
                RGBLuminanceSource source = new RGBLuminanceSource(bitmap);
                    BinaryBitmap bitmap1 = new BinaryBitmap(new HybridBinarizer(source));  
                     QRCodeReader reader2= new QRCodeReader();
                     Result result = null;
                   try {
                     try {
                        result = reader2.decode(bitmap1,hints);
                    } catch (ChecksumException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (FormatException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                     System.out.println("res"+result.getText());
                     TextView text  = (TextView)findViewById(R.id.text);
                    text.setText(result.getText());
                    } catch (NotFoundException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } 
            }

但是可能由于版本問題，QRCodeReader.decode()方法的參數有點變化，可以參考

http://blog.csdn.net/cgwcgw_/article/details/10817121

Map<DecodeHintType, String> map = new HashMap<DecodeHintType, String>();  
        map.put(DecodeHintType.CHARACTER_SET, "utf-8");

HashMap<DecodeHintType, String> hints = new HashMap<DecodeHintType, String>();  
hints.put(DecodeHintType.CHARACTER_SET, "utf-8");

Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");