从图像文件扫描QR码

最后，我找到了解决方案。代码是（源自此处）：

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.depre(bitmap);        contents = result.getText();    }    catch (Exception e) {        Log.e("QrTest", "Error decoding barpre", 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.depreStream(is);String depred=scanQRImage(bitmap);Log.i("QrTest", "Depred string="+depred);