从图像文件扫描二维码

Question

尝试使用 ZXing、ZBar 及其分支等几个库，但没有找到不是从相机而是从文件中扫描条形码的方法。

有人能指出我正确的方向吗？最好我正在研究 ZXing: how to scan image from file (not from camera).

请。

Answer 1

最后我找到了解决方案。代码是（源自here）：

import com.google.zxing.*;

public static String scanQRImage(Bitmap bMap) {
    String contents = null;

    int[] intArray = new int[bMap.getWidth()*bMap.getHeight()];
    //copy pixel data from the Bitmap into the 'intArray' array
    bMap.getPixels(intArray, 0, bMap.getWidth(), 0, 0, bMap.getWidth(), bMap.getHeight());

    LuminanceSource source = new RGBLuminanceSource(bMap.getWidth(), bMap.getHeight(), intArray);
    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

    Reader reader = new MultiFormatReader();
    try {
        Result result = reader.decode(bitmap);
        contents = result.getText();
    }
    catch (Exception e) {
        Log.e("QrTest", "Error decoding barcode", e);
    }
    return contents;
}

Gradle 引用为：

dependencies {
    compile 'com.google.zxing:core:3.2.1'
}

用法：

InputStream is = new BufferedInputStream(new FileInputStream(file));
Bitmap bitmap = BitmapFactory.decodeStream(is);
String decoded=scanQRImage(bitmap);
Log.i("QrTest", "Decoded string="+decoded);