Android Camera遇到的坑

拍照后onPictureTaken()不能回调

在小米手机3上发现正常运行的程序拍照无法正常回调，且点击拍照按钮后会停留在最后拍照的界面，且日志里不会有任何报错信息。经排查发现是初始化相机的时候设置了setPictureSize()导致的。

奇怪的是系统相机一切正常，且可以用硬件最大分辨率，可是我的代码里只能支持最高为2688x1520的pictureSize，否则均无法收到onPictureTaken回调。

后来发现我的previewSize设置的是系统最高分辨率3840x2160,后来把分辨率改为系统屏幕近似分辨率后，pictureSize可以设置最高分辨率了。

下面给出代码：

/** 预览界面分辨率 */
    public static void setPreviewSize(Camera.Parameters parametes) {
        List<Camera.Size> localSizes = parametes.getSupportedPreviewSizes();
        Camera.Size biggestSize = null;
        Camera.Size fitSize = null;// 优先选屏幕分辨率
        Camera.Size targetSize = null;// 没有屏幕分辨率就取跟屏幕分辨率相近(大)的size
        Camera.Size targetSiz2 = null;// 没有屏幕分辨率就取跟屏幕分辨率相近(小)的size
        if(localSizes != null) {
            int cameraSizeLength = localSizes.size();
            for (int n = 0; n < cameraSizeLength; n++) {
                Camera.Size size = localSizes.get(n);
                if(biggestSize == null ||
                        (size.width >= biggestSize.width && size.height >= biggestSize.height)) {
                    biggestSize = size;
                }

                if(size.width == DeviceUtils.screenHPixels
                        && size.height == DeviceUtils.screenWPixels) {
                    fitSize = size;
                } else if (size.width == DeviceUtils.screenHPixels
                        || size.height == DeviceUtils.screenWPixels) {
                    if(targetSize == null) {
                        targetSize = size;
                    } else if (size.width < DeviceUtils.screenHPixels
                            || size.height < DeviceUtils.screenWPixels) {
                        targetSiz2 = size;
                    }
                }
            }

            if(fitSize == null) {
                fitSize = targetSize;
            }

            if(fitSize == null) {
                fitSize = targetSiz2;
            }

            if(fitSize == null) {
                fitSize = biggestSize;
            }
            parametes.setPreviewSize(fitSize.width, fitSize.height);
        }

    }

    /** 输出的照片为最高像素 */
    public static void setPictureSize(Camera.Parameters parametes) {
        List<Camera.Size> localSizes = parametes.getSupportedPictureSizes();
        Camera.Size biggestSize = null;
        Camera.Size fitSize = null;// 优先选预览界面的尺寸
        Camera.Size previewSize = parametes.getPreviewSize();
        float previewSizeScale = 0;
        if(previewSize != null) {
            previewSizeScale = previewSize.width / (float) previewSize.height;
        }

        if(localSizes != null) {
            int cameraSizeLength = localSizes.size();
            for (int n = 0; n < cameraSizeLength; n++) {
                Camera.Size size = localSizes.get(n);
                if(biggestSize == null) {
                    biggestSize = size;
                } else if(size.width >= biggestSize.width && size.height >= biggestSize.height) {
                    biggestSize = size;
                }

                // 选出与预览界面等比的最高分辨率
                if(previewSizeScale > 0
                        && size.width >= previewSize.width && size.height >= previewSize.height) {
                    float sizeScale = size.width / (float) size.height;
                    if(sizeScale == previewSizeScale) {
                        if(fitSize == null) {
                            fitSize = size;
                        } else if(size.width >= fitSize.width && size.height >= fitSize.height) {
                            fitSize = size;
                        }
                    }
                }
            }

            // 如果没有选出fitSize, 那么最大的Size就是FitSize
            if(fitSize == null) {
                fitSize = biggestSize;
            }

            parametes.setPictureSize(fitSize.width, fitSize.height);
        }
    }

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