相机预览的时候变形。

dai_jiawei 2015-06-13 11:22:17

因为我的相机预览界面并不是全屏显示的，仅仅是在我指定大小的surfaceView中显示，所以导致了相机预览界面变形，请问要怎么改？

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cdsm石 2015-08-21

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请问下楼主最后是怎么解决这个问题的啊，我也遇到了这个问题，不知道咋解决了

只为搞笑 2015-07-03

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其实在ZXing的demo里已经给出了这样一个寻找最优尺寸的方法，楼主拿去改一下就能满足自己的需求的

只为搞笑 2015-07-03

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private Point findBestPreviewSizeValue(Camera.Parameters parameters, Point screenResolution) { List<Camera.Size> rawSupportedSizes = parameters.getSupportedPreviewSizes(); if (rawSupportedSizes == null) { Log.w(TAG, "Device returned no supported preview sizes; using default"); Camera.Size defaultSize = parameters.getPreviewSize(); return new Point(defaultSize.width, defaultSize.height); } // Sort by size, descending List<Camera.Size> supportedPreviewSizes = new ArrayList<>(rawSupportedSizes); Collections.sort(supportedPreviewSizes, new Comparator<Camera.Size>() { @Override public int compare(Camera.Size a, Camera.Size b) { int aPixels = a.height * a.width; int bPixels = b.height * b.width; if (bPixels < aPixels) { return -1; } if (bPixels > aPixels) { return 1; } return 0; } }); if (Log.isLoggable(TAG, Log.INFO)) { StringBuilder previewSizesString = new StringBuilder(); for (Camera.Size supportedPreviewSize : supportedPreviewSizes) { previewSizesString.append(supportedPreviewSize.width).append('x') .append(supportedPreviewSize.height).append(' '); } Log.i(TAG, "Supported preview sizes: " + previewSizesString); } double screenAspectRatio = (double) screenResolution.x / (double) screenResolution.y; // Remove sizes that are unsuitable Iterator<Camera.Size> it = supportedPreviewSizes.iterator(); while (it.hasNext()) { Camera.Size supportedPreviewSize = it.next(); int realWidth = supportedPreviewSize.width; int realHeight = supportedPreviewSize.height; if (realWidth * realHeight < MIN_PREVIEW_PIXELS) { it.remove(); continue; } boolean isCandidatePortrait = realWidth < realHeight; int maybeFlippedWidth = isCandidatePortrait ? realHeight : realWidth; int maybeFlippedHeight = isCandidatePortrait ? realWidth : realHeight; double aspectRatio = (double) maybeFlippedWidth / (double) maybeFlippedHeight; double distortion = Math.abs(aspectRatio - screenAspectRatio); if (distortion > MAX_ASPECT_DISTORTION) { it.remove(); continue; } if (maybeFlippedWidth == screenResolution.x && maybeFlippedHeight == screenResolution.y) { Point exactPoint = new Point(realWidth, realHeight); Log.i(TAG, "Found preview size exactly matching screen size: " + exactPoint); return exactPoint; } } // If no exact match, use largest preview size. This was not a great idea on older devices because // of the additional computation needed. We're likely to get here on newer Android 4+ devices, where // the CPU is much more powerful. if (!supportedPreviewSizes.isEmpty()) { Camera.Size largestPreview = supportedPreviewSizes.get(0); Point largestSize = new Point(largestPreview.width, largestPreview.height); Log.i(TAG, "Using largest suitable preview size: " + largestSize); return largestSize; } // If there is nothing at all suitable, return current preview size Camera.Size defaultPreview = parameters.getPreviewSize(); Point defaultSize = new Point(defaultPreview.width, defaultPreview.height); Log.i(TAG, "No suitable preview sizes, using default: " + defaultSize); return defaultSize; }

dai_jiawei 2015-07-02

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引用 8 楼 x13945 的回复:

一般摄像头支持的分辨率只有固定的几种。所以，针对你这种情况，SurfaceView的宽高可以看作已经固定，只能使用Matrix对预览画面进行裁剪，达到不变形到目的

你好。能简单给出几句代码吗？实在是不懂。走投无路了。

dai_jiawei 2015-06-18

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引用 5 楼 dalor 的回复:

[quote=引用 4 楼 dai_jiawei 的回复:] [quote=引用 3 楼 dalor 的回复:] 获得相机预览时的图片比例，再对surfaceView中的预览进行等比例显示。初始化camera的时候给其设置好相同比例的预览图尺寸和实际图的尺寸，并且设置你的SurfaceView的尺寸比例相同就行了。

我SurfaceView的高是设定死的。205dp.然后宽是取屏幕宽，但是我如果用parameter.setPreviewSize(screenWidth,205);的话。程序会报错。网上查了下好像setPreviewSize()里面是需要填入固定的值。[/quote] 你这里的screenWidth是计算后的值，不也是个固定值吗？觉得还应该是你代码设置的问题。[/quote] 啊。。我没表述清楚。不是说里面的值不能写死。是说填入的宽高比是有几组固定值的。比如我填入800，480这样就行。