Nexus 手机 原生Android系统 Android 8.0
问题
测试发现在Nexus手机，android8.0手机上发现，扫码的时候显示的拍照预览方向不正，有180度的旋转并且变形。 但是在其他手机及系统上测试是没有问题的。
解决
还是依旧Stack Overflow啊。 亲测完美解决此问题。
private void surfaceIsChanged() { if (mHolder.getSurface() == null) { System.out.println("getSurface,nullnull"); return; } try { mCamera.stopPreview(); } catch (Exception e) { } try { Camera.Size previewSize = mCamera.getParameters().getPreviewSize(); int dataBufferSize = (int) (previewSize.height * previewSize.width * (ImageFormat.getBitsPerPixel(mCamera.getParameters() .getPreviewFormat()) / 8.0)); mCamera.addCallbackBuffer(new byte[dataBufferSize]); mCamera.setPreviewDisplay(mHolder); mCamera.setPreviewCallbackWithBuffer(previewCallback); mCamera.startPreview(); mCamera.autoFocus(autoFocusCallback); Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); int camIdx = 0; // DO your logic to get front or back camera...or loop through all avaialable. Camera.getCameraInfo(camIdx, cameraInfo); try { // If using back camera then simply rotate what CameraInfo tells you. if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) mCamera.setDisplayOrientation(cameraInfo.orientation); else // If using front camera note that image might be flipped to give users the impresion the are looking at a mirror. mCamera.setDisplayOrientation( (360 - cameraInfo.orientation) % 360); } catch (Exception e) { e.printStackTrace(); } // Toast.makeText(QRZbarActivity.this, "开始扫描", // Toast.LENGTH_SHORT).show(); autoOpenLight(); } catch (Exception e) { Toast.makeText(BaseScanActivity.this, R.string.account_toast_not_open_camera, Toast.LENGTH_SHORT).show();// showTip("您未允许" + getResources().getString(R.string.app_name) + "访问您的相册\n请在“安全中心 -授权管理”中更改设置"); Log.d("DBG", "Error starting camera preview: " + e.getMessage()); } }复制代码 其中主要生效的代码是：
Camera.CameraInfo cameraInfo = new Camera.CameraInfo(); int camIdx = 0; // DO your logic to get front or back camera...or loop through all avaialable. Camera.getCameraInfo(camIdx, cameraInfo); try { // If using back camera then simply rotate what CameraInfo tells you. if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) mCamera.setDisplayOrientation(cameraInfo.orientation); else // If using front camera note that image might be flipped to give users the impresion the are looking at a mirror. mCamera.setDisplayOrientation( (360 - cameraInfo.orientation) % 360); } catch (Exception e) { e.printStackTrace(); }复制代码 根据照相的内容进行设置显示方向。
参考：
// END 2018年4月19日