Nexus Android8 0系統拍照預覽方向問題解決方法

Nexus 手機 原生Android系統 Android 8.0

問題

測試發如今Nexus手機，android8.0手機上發現，掃碼的時候顯示的拍照預覽方向不正，有180度的旋轉而且變形。 可是在其餘手機及系統上測試是沒有問題的。

解決

仍是依舊Stack Overflow啊。 親測完美解決此問題。

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, "開始掃描",
            // Toast.LENGTH_SHORT).show();
            autoOpenLight();
        } catch (Exception e) {
            Toast.makeText(BaseScanActivity.this, R.string.account_toast_not_open_camera, Toast.LENGTH_SHORT).show();
//			showTip("您未容許" + getResources().getString(R.string.app_name) + "訪問您的相冊\n請在「安全中心 -受權管理」中更改設置");
            Log.d("DBG", "Error starting camera preview: " + e.getMessage());
        }
    }
複製代碼

其中主要生效的代碼是：

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();
            }
複製代碼

根據照相的內容進行設置顯示方向。

參考：解決方法

// END 2018年4月19日