android 相机报错 setParameters failed

List<Camera.Size> sizeList = parameters.getSupportedPreviewSizes();
int PreviewWidth = 640;
int PreviewHeight = 480;
Boolean findSize = false;
				 
				if (sizeList.size() > 1) {
					Iterator<Camera.Size> itor = sizeList.iterator();
					while (itor.hasNext()) {
						Camera.Size cur = itor.next();
						if (cur.width >= PreviewWidth
								&& cur.height >= PreviewHeight) {
							findSize = true;
							PreviewWidth = cur.width;
							PreviewHeight = cur.height;
							break;
						}
					}
				}
				if (!findSize) {
					PreviewWidth = sizeList.get(0).width;
					PreviewHeight = sizeList.get(0).height;
				}
				parameters.setPreviewSize(PreviewWidth, PreviewHeight);