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<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;
}

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：<span style="white-space:pre"> </span>List<Camera.Size> 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~~~