怎么設置預覽界面與實景保持一致的方法，官方給出的文檔：
public static void setCameraDisplayOrientation(Activity activity,int cameraIo, Camera camera){Camera.CameraInfo info=new Camera.CameraInfo();Camera.getCameraInfo(cameraIo,info);int rotation=activity.getWindowManager().getDefaultDisplay().getRotation();int degress=0;switch(rotation){case Surface.ROTATION_0: degress=0; break;case Surface.ROTATION_90: degress=90; break; case Surface.ROTATION_180: degress=180; break;case Surface.ROTATION_270: degress=270; break;}int result;if(info.facing=Camera.CameraInfo.CAMERA_FACING_FRONT){ result = (info.orientation + degrees) % 360; > 就是攝像頭需要順時針轉過多少度才能恢復自然方向 result = (360 - result) % 360; } else { // back-facing result = (info.orientation - degrees + 360) % 360; } camera.setDisplayOrientation(result);switch (result) { case 0: case 180: setCameraSize(camera.getParameters(), getScreenWidth(), getScreenHeight()); break; case 90: case 270: setCameraSize(camera.getParameters(), getScreenHeight(), getScreenWidth()); break;}}public static void setCameraSize(Camera.Parameters parameters, int width, int height) { Map<String, List<Size>> allSizes = new HashMap<>(); String typePReview = "typePreview"; String typePicture = "typePicture"; allSizes.put(typePreview, parameters.getSupportedPreviewSizes()); allSizes.put(typePicture, parameters.getSupportedPictureSizes()); Iterator iterator = allSizes.entrySet().iterator(); while (iterator.hasNext()) { Map.Entry<String, List<Size>> entry = (Map.Entry<String, List<Size>>) iterator.next(); List<Size> sizes = entry.getValue(); if (sizes == null || sizes.isEmpty()) continue; ArrayList<WrapCameraSize> wrapCameraSizes = new ArrayList<>(sizes.size()); for (Size size : sizes) { WrapCameraSize wrapCameraSize = new WrapCameraSize(); wrapCameraSize.setWidth(size.width); wrapCameraSize.setHeight(size.height); wrapCameraSize.setD(Math.abs((size.width - width)) + Math.abs((size.height - height))); if (size.width == width && size.height == height) { if (typePreview.equals(entry.getKey())) { parameters.setPreviewSize(size.width, size.height); } else if (typePicture.equals(entry.getKey())) { parameters.setPictureSize(size.width, size.height); } Log.d(TAG, "best size: width=" + size.width + ";height=" + size.height); break; } wrapCameraSizes.add(wrapCameraSize); } Log.d(TAG, "wrapCameraSizes.size()=" + wrapCameraSizes.size()); Size resultSize = null; if (typePreview.equals(entry.getKey())) { resultSize = parameters.getPreviewSize(); } else if (typePicture.equals(entry.getKey())) { resultSize = parameters.getPictureSize(); } if (resultSize == null || (resultSize.width != width && resultSize.height != height)) { //找到相機Preview Size 和 Picture Size中最適合的大小 if(wrapCameraSizes.isEmpty()) continue; WrapCameraSize minCameraSize = Collections.min(wrapCameraSizes); while (!(minCameraSize.getWidth() >= width && minCameraSize.getHeight() >= height)) { wrapCameraSizes.remove(minCameraSize); if(wrapCameraSizes.isEmpty()) break; minCameraSize = null; minCameraSize = Collections.min(wrapCameraSizes); } Log.d(TAG, "best min size: width=" + minCameraSize.getWidth() + ";height=" + minCameraSize.getHeight()); if (typePreview.equals(entry.getKey())) { parameters.setPreviewSize(minCameraSize.getWidth(), minCameraSize.getHeight()); } else if (typePicture.equals(entry.getKey())) { parameters.setPictureSize(minCameraSize.getWidth(), minCameraSize.getHeight()); } } iterator.remove(); } }先將獲取手機支持預覽的尺寸列表通過parmeters.getSupportPreviewSize返回的是一個集合。進行屏幕方向的判斷，因為預覽的尺寸都是w>h 如果是豎屏，則需要將寬和高進行調(diào)換將預覽尺寸列表的每個元素的寬和高與SurfaceView的寬和高進行比較，如果存在寬和高尺寸SurfaceView的寬和高，相同的size，則將當前的寬高設置為預覽尺寸如果沒有找到該步驟，則將尺寸列表的比例和SUrfaceView的比例做比較，找一個相同或者相近的 。新聞熱點
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