使用ZXing扫描图像(而不是摄像头)中的二维码

我正在使用ZXing库进行条形码扫描。

我要使用此库从图像(例如，SD卡上)而不是从相机扫描条形码。

如何使用ZXing库执行此操作？

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解决方案

我想在发布之前测试一下，所以花了一些时间，我现在也在使用ZXing，所以这个对我来说也很方便：

当然，首先，阅读图库中的图像(这可以在您的活动中)：

        Intent pickIntent = new Intent(Intent.ACTION_PICK);
        pickIntent.setDataAndType( android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");

        startActivityForResult(pickIntent, 111);

之后，只需获取活动结果上的图像uri，ZXing就会施展魔力：

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        switch (requestCode) {
            //the case is because you might be handling multiple request codes here
            case 111:
                if(data == null || data.getData()==null) {
                    Log.e("TAG", "The uri is null, probably the user cancelled the image selection process using the back button.");
                    return;
                }
                Uri uri = data.getData();
                try
                {
                    InputStream inputStream = getContentResolver().openInputStream(uri);
                    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                    if (bitmap == null)
                    {
                        Log.e("TAG", "uri is not a bitmap," + uri.toString());
                        return;
                    }
                    int width = bitmap.getWidth(), height = bitmap.getHeight();
                    int[] pixels = new int[width * height];
                    bitmap.getPixels(pixels, 0, width, 0, 0, width, height);
                    bitmap.recycle();
                    bitmap = null;
                    RGBLuminanceSource source = new RGBLuminanceSource(width, height, pixels);
                    BinaryBitmap bBitmap = new BinaryBitmap(new HybridBinarizer(source));
                    MultiFormatReader reader = new MultiFormatReader();
                    try
                    {
                        Result result = reader.decode(bBitmap);
                        Toast.makeText(this, "The content of the QR image is: " + result.getText(), Toast.LENGTH_SHORT).show();
                    }
                    catch (NotFoundException e)
                    {
                        Log.e("TAG", "decode exception", e);
                    }
                }
                catch (FileNotFoundException e)
                {
                    Log.e("TAG", "can not open file" + uri.toString(), e);
                }
                break;
        }
    }

我测试了一下，它起作用了，干杯。