android自定义相机黑屏问题

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对于一些手机，像HTC，当自定义Camera时，调用Camera.Parameters的parameters.setPreviewSize(width,height)方法时，如果width和height为奇数情况下，则会出现黑屏现象，解决办法可参考SDK提供的ApiDemos中关于Camera的例子：

List<Size> sizes =parameters.getSupportedPreviewSizes();

Size optimalSize = getOptimalPreviewSize(sizes, w,h);
parameters.setPreviewSize(optimalSize.width, optimalSize.height);

同时，在HTC手机中，设置parameters.setPictureSize(width,height)属性，也会导致黑屏，而在三星手机上则没有问题。还有如果设置setPreviewSize属性的宽高错误的话，拍出的照片也会存在失真等Bug，所以遇到适配问题时，最好的办法就是不设置PreviewSize和PictureSize属性。

getOptimalPreviewSize方法

private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {  final double ASPECT_TOLERANCE = 0.05;  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; }