Question

我有这段代码：

surfaceView = (SurfaceView)findViewById(R.id.camera_view);
textView = (TextView)findViewById(R.id.code_info);

barcodeDetector = new BarcodeDetector.Builder(this).setBarcodeFormats(Barcode.QR_CODE).build();

cameraSource = new CameraSource.Builder(this, barcodeDetector).setRequestedPreviewSize( 800, 1280).build();

我尝试更改“setRequestedPreviewSize”但我不能......，我该怎么做？

抱歉英语不好，我是意大利人

Answer 1

如果您可以提供更多代码，我可以告诉您更多信息，但问题可能是您要设置设备相机不支持的预览尺寸。

您可以通过Google API方法决定预览尺寸，称为getOptimalPreviewSize。 https://android.googlesource.com/platform/development/+/1e7011fcd5eee3190b436881af33cd9715eb8d36/samples/ApiDemos/src/com/example/android/apis/graphics/CameraPreview.java

private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
    final double ASPECT_TOLERANCE = 0.1;
    double targetRatio = (double) w / h;
    if (sizes == null) return null;
    Size optimalSize = null;
    double minDiff = Double.MAX_VALUE;
    int targetHeight = h;
    // Try to find an size match aspect ratio and size
    for (Size size : sizes) {
        double ratio = (double) size.width / size.height;
        if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
        if (Math.abs(size.height - targetHeight) < minDiff) {
            optimalSize = size;
            minDiff = Math.abs(size.height - targetHeight);
        }
    }
    // Cannot find the one match the aspect ratio, ignore the requirement
    if (optimalSize == null) {
        minDiff = Double.MAX_VALUE;
        for (Size size : sizes) {
            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }
    }
    return optimalSize;
}

您可以使用此功能获得支持的预览尺寸 mSupportedPreviewSizes = mCamera.getParameters（）。getSupportedPreviewSizes（）;

然后将此参数以及宽度和高度传递给上面的方法，它将为您提供最佳的预览尺寸，也可以由设备的相机支持。

Android CameraSource调整预览大小

1 个答案: