Android使用Zxing解析二维码图片

jopen 9年前

这里省去导入相应的Zxing 的jar包,直接上一个类和调用示例

除了jar包,这里还要用到一个类就是


/*   * 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;   }  }


调用示例


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();       }      }


但是可能由于版本问题,QRCodeReader.decode()方法的参数有点变化,可以参考

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");
这三个参数看情况而定吧。