Android Camera实现旋转角度

public static void setCameraDisplayOrientation(Activity activity, int cameraId, android.hardware.Camera camera) {
    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);
}

private static final SparseIntArray ORIENTATIONS = new SparseIntArray();

// Conversion from screen rotation to JPEG orientation.
static {
    ORIENTATIONS.append(Surface.ROTATION_0, 90);
    ORIENTATIONS.append(Surface.ROTATION_90, 0);
    ORIENTATIONS.append(Surface.ROTATION_180, 270);
    ORIENTATIONS.append(Surface.ROTATION_270, 180);
}

/**
 * Retrieves the JPEG orientation from the specified screen rotation.
 *
 * @param rotation The screen rotation.
 * @return The JPEG orientation (one of 0, 90, 270, and 360)
 */
private int getOrientation(int rotation) {
    // Sensor orientation is 90 for most devices, or 270 for some devices (eg. Nexus 5X)
    // We have to take that into account and rotate JPEG properly.
    // For devices with orientation of 90, we simply return our mapping from ORIENTATIONS.
    // For devices with orientation of 270, we need to rotate the JPEG 180 degrees.
    return (ORIENTATIONS.get(rotation) + mSensorOrientation + 270) % 360;
}

final CaptureRequest.Builder captureBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, getOrientation(rotation));