主要参考系统相机代码实现getDisplayOritation就可以了
//在preview之前调用setDisplayOrientation
int degrees = getDisplayOritation(getDispalyRotation(), cameraId);
mCamera.setDisplayOrientation(degrees);
mCamera.startPreview();
getDisplayOritation函数如下:
private int getDisplayOritation(int degrees, int cameraId) {
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(cameraId, info);
int result;
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation + degrees) % 360;
result = (360 - result) % 360;
} else {
result = (info.orientation - degrees + 360) % 360;
}
return result;
}
private int getDispalyRotation() {
int i = getWindowManager().getDefaultDisplay().getRotation();
switch (i) {
case Surface.ROTATION_0:
return 0;
case Surface.ROTATION_90:
return 90;
case Surface.ROTATION_180:
return 180;
case Surface.ROTATION_270:
return 270;
}
return 0;
}