android调用摄像头变形,Android学习【1】解决android摄像头预览的变形问题

今天开始弄安卓摄像头开发，开始比较顺利，成功实现了摄像头预览拍照的问题，发现预览时SurfaceView 出现了变形的问题，拍照保存图像后也有相应的问题，于是各种网上查找以及分析api。

最终发现api中使用getOptimalPreviewSize这个函数解决了变形的问题。

private Size getOptimalPreviewSize(List 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;

}

通过这个函数自动获取最适宜的长宽比例，然后通过setPreviewSize将获取到的size进行设置就解决啦~~~

核心代码如下：

List sizes = myParameters.getSupportedPreviewSizes(); //获取系统的size集合

Camera.Size optimalSize = getOptimalPreviewSize(sizes, mySurfaceView.getHeight(), mySurfaceView.getWidth());

//根据surfaceview控件的比例选择size

myParameters.setPreviewSize(optimalSize.width, optimalSize.height); //进行size设置

第一次发帖~~如有不足欢迎各位大神指导~~~