我有Google Mobile Vision的开源代码 - CameraSource,这是我调用点击照片的方法:cameraSource.takePicture();
在开源版本的CameraSource.java中,确定屏幕方向的方法是库存方法:
private void setRotation(Camera camera, Camera.Parameters parameters, int cameraId) {
WindowManager windowManager =
(WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
int degrees = 0;
int rotation = windowManager.getDefaultDisplay().getRotation();
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;
default:
Log.e(TAG, "Bad rotation value: " + rotation);
}
CameraInfo cameraInfo = new CameraInfo();
Camera.getCameraInfo(cameraId, cameraInfo);
int angle;
int displayAngle;
if (cameraInfo.facing == CameraInfo.CAMERA_FACING_FRONT) {
angle = (cameraInfo.orientation + degrees) % 360;
displayAngle = (360 - angle) % 360; // compensate for it being mirrored
} else { // back-facing
angle = (cameraInfo.orientation - degrees + 360) % 360;
displayAngle = angle;
}
// This corresponds to the rotation constants in {@link Frame}.
mRotation = angle / 90;
camera.setDisplayOrientation(displayAngle);
parameters.setRotation(angle);
}
此处,三星,联想和Yuntab H8的displayAngle和角度相同。但是为backCamera返回的位图在每个设备中的旋转方式都不同。我必须手动旋转每个设备的位图(三星:90,联想:0和Yuntab:180)
我的要求是onPictureTaken应该返回一个与当前显示方向匹配的位图。我正在研究这个问题,因为很长一段时间但仍需要找到解决方案的方法。下面是我的onPicturetaken()(拍照后调用):
@Override
public void onPictureTaken(byte[] bytes) {
try {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2;
bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length, currentCameraId == 0 ? options : null);
}catch (Exception ex){
ex.printStackTrace();
Log.e("PictureTaken",ex.toString());
}
};
答案 0 :(得分:2)
当图像已保存在设备中时,您应旋转图像。
然后你可以旋转它以匹配照片拍摄时的位置。
示例代码(可能需要一些清理和改进,但它可以运行 ...):
方法确实计算图像的旋转:
private static int rotationNeeded(String path) {
try {
File file = new File(path);
if (!file.getName().contains(".jpg")) {
return 0;
}
ExifInterface exif = new ExifInterface(file.getAbsolutePath());
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
if (orientation == ExifInterface.ORIENTATION_ROTATE_270) {
return 270;
}
if (orientation == ExifInterface.ORIENTATION_ROTATE_180) {
return 180;
}
if (orientation == ExifInterface.ORIENTATION_ROTATE_90) {
return 90;
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return 0;
}
应用图片所需的旋转:
public static void rotateImage(String filePath) {
try {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2;
Bitmap bitmap = BitmapFactory.decodeFile(filePath, options);
//check image rotation
int rotate = rotationNeeded(filePath);
if (rotate != 0) {
//rotate image if needed
Matrix matrix = new Matrix();
matrix.postRotate(rotate);
Bitmap rotatedImage = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),
bitmap.getHeight(), matrix, true);
bitmap.recycle();
bitmap = rotatedImage;
//save image
byte[] dataPicture = bao.toByteArray();
FileOutputStream fos = new FileOutputStream(filePath);
fos.write(dataPicture);
fos.flush();
fos.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}