我们在做自定义相机开发的过程中，一般会使用SurfaceView或者GlSurfaceView做预览，预览或拍照的时候经常会碰到镜像的左右颠倒或者上下颠倒？这个该怎么处理，这里给出解决方案。

一、拍照照片镜像左右颠倒，使用Matrix来设置

Matrix m = new Matrix();

m.postScale(-1, 1); // 镜像水平翻转

bmpPreview = Bitmap.createBitmap(bmpPreview, 0, 0, bmpPreview.getWidth(), bmpPreview.getHeight(), m, true);

二、镜像上下颠倒，需要设置相机预览的显示方向

public static void setCameraDisplayOrientation(Activity activity,

int cameraId, android.hardware.Camera camera) {

try {

android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();

android.hardware.Camera.getCameraInfo(cameraId, info);

int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();

int degrees = 0;

switch (rotation) {

case Surface.ROTATION_0:

degrees = 0;

break;

case Surface.ROTATION_90:

degrees = 90;

break;

case Surface.ROTATION_180:

degrees = 180;

break;

case Surface.ROTATION_270:

degrees = 270;

break;

}

int result;

if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {

result = (info.orientation + degrees) % 360;

result = (360 - result) % 360; // compensate the mirror

} else { // back-facing

result = (info.orientation - degrees + 360) % 360;

}

camera.setDisplayOrientation(result);

} catch (Exception e) {

CommonUtil.printStackTrace(e);

}

}

拍完照后还得旋转图片

Matrix matrix = new Matrix();

matrix.postRotate(CamParaUtil.getCameraDisplayOrientation(StickerMakeActivity.this, mCameraId, mCamera));

matrix.postScale(scale, isCameraFront() ? -scale : scale);

Bitmap cropRotateScaled = Bitmap.createBitmap(origin, (int) resultRect.left, (int) resultRect.top, (int) resultRect.width(), (int) resultRect.height(), matrix, true);

public static int getCameraDisplayOrientation(Activity activity,

int cameraId, android.hardware.Camera camera) {

int result = 90;

try {

android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();

android.hardware.Camera.getCameraInfo(cameraId, info);

int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();

int degrees = 0;

switch (rotation) {

case Surface.ROTATION_0:

degrees = 0;

break;

case Surface.ROTATION_90:

degrees = 90;

break;

case Surface.ROTATION_180:

degrees = 180;

break;

case Surface.ROTATION_270:

degrees = 270;

break;

}

if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {

result = (info.orientation + degrees) % 360;

result = (360 - result) % 360; // compensate the mirror

} else { // back-facing

result = (info.orientation - degrees + 360) % 360;

}

} catch (Exception e) {

CommonUtil.printStackTrace(e);

}

return result;

}