我已经设法使用这里的答案将相机预览旋转到人像:http://code.google.com/p/zxing/issues/detail?id=178#c46
然而,预览本身被拉伸/扭曲了-高度似乎被拉伸以填充框(但可能是宽度对屏幕来说太大,并且被挤压无法容纳)
有没有什么方法可以"包装"内容,而不是使其拉伸以适应表面视图?
编辑:我通过更改"CameraConfigurationManager"中的"findBestPreviewSizeValue"方法并反转X点和Y点来对其进行排序(感谢下面的指针!),代码如下:
private static Point findBestPreviewSizeValue(CharSequence previewSizeValueString,
Point screenResolution) {
int bestX = 0;
int bestY = 0;
int diff = Integer.MAX_VALUE;
for (String previewSize : COMMA_PATTERN.split(previewSizeValueString)) {
previewSize = previewSize.trim();
int dimPosition = previewSize.indexOf('x');
if (dimPosition < 0) {
Log.w(TAG, "Bad preview-size: " + previewSize);
continue;
}
int newX;
int newY;
try {
newY = Integer.parseInt(previewSize.substring(0, dimPosition));
newX = Integer.parseInt(previewSize.substring(dimPosition + 1));
//original:
//newX = Integer.parseInt(previewSize.substring(0, dimPosition));
//newY = Integer.parseInt(previewSize.substring(dimPosition + 1));
} catch (NumberFormatException nfe) {
Log.w(TAG, "Bad preview-size: " + previewSize);
continue;
}
int newDiff = Math.abs(newX - screenResolution.x) + Math.abs(newY - screenResolution.y);
if (newDiff == 0) {
bestX = newY;
bestY = newX;
//original:
//bestX = newX;
//bestY = newY;
break;
} else if (newDiff < diff) {
bestX = newY;
bestY = newX;
//original:
//bestX = newX;
//bestY = newY;
diff = newDiff;
}
}
if (bestX > 0 && bestY > 0) {
return new Point(bestX, bestY);
}
return null;
}
要实现这一点,您必须做更多的工作,而不仅仅是将预览设置为纵向模式。例如,您需要选择一个合适的预览大小,因为它是纵向的,而不是横向的。
包裹肯定不可取?不,你不能把它包起来;它总是将整个预览图像投射到SurfaceView
上,如果需要的话进行拉伸。我想你可以重新实现很多代码来做一些不同的事情,但这会很难。
我也遇到了同样的问题,但我可以通过反转findBestPreviewSizeValue中CameraConfigurationManager.java文件上的纵横比来解决这个问题
float screenAspectRatio = (float) screenResolution.x / (float) screenResolution.y;
到这个
float screenAspectRatio = (float) screenResolution.y / (float) screenResolution.x;
我在这里找到了解决方案。
http://bighow.net/4660010-Android_zxing___portrait_camera_preview_surfaceview_is_stretched_warped.html
您可以通过以下函数获取Privview大小:
private List mSupportedPreviewSize=parameters.getSupportedPreviewSize()
if (mSupportedPreviewSizes != null) {
mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
}
private Camera.Size getOptimalPreviewSize(List<Camera.Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.1;
double targetRatio = (double) h / w;
if (sizes == null)
return null;
Camera.Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
for (Camera.Size size : sizes) {
double ratio = (double) size.height / size.width;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Camera.Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
float ratio;
if (mPreviewSize.height >= mPreviewSize.width)
ratio = (float) mPreviewSize.height / (float) mPreviewSize.width;
else
ratio = (float) mPreviewSize.width / (float) mPreviewSize.height;
after getting ratio set your size in
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension((int) (width * ratio), height);
}
我通过更改CameraConfigurationManager.java
:中的以下代码来实现这一点
float screenAspectRatio = (float) screenResolution.x / (float) screenResolution.y;
收件人:
float screenAspectRatio = (float) screenResolution.y / (float) screenResolution.x;
和
float aspectRatio = (float) maybeFlippedWidth / (float) maybeFlippedHeight;
收件人:
float aspectRatio = (float) maybeFlippedHeight / (float) maybeFlippedWidth;
我在这篇文章旁边做了这件事:Zxing相机在Android 上的人像模式
希望这能帮助其他人。
变形的原因可能是相机的预览纵横比与显示器的纵横比不匹配。
手机屏幕的宽高比大多为4:3,如2560x1440、1920x1080等。当您使用参数.setPreviewSize(width,height)设置相机预览尺寸时,如果height:width的值不等于手机屏幕的长宽比,相机的图片将变形以填充屏幕。