[英]Android camera/picture orientation issues with Samsung Galaxy S3, S4, S5
我正在為Android API 16到21開發相機應用程序,其主要目的是拍攝肖像照片。 我可以用幾個設備(Nexus 4,Nexus 5,HTC ......)拍照並正確定位(意味着我的預覽等於拍攝的照片尺寸和方向)。
但是我已經在其他幾個設備上測試了我的應用程序,其中一些設備給我帶來了很多麻煩:三星Galaxy S3 / S4 / S5。
在這三個設備上,正確顯示預覽,但是由onPictureTaken(final byte[] jpeg, Camera camera)
返回的圖片始終是側面的。
這是從byte[] jpeg
創建的Bitmap,在將其保存到磁盤之前在ImageView中顯示給我的用戶:
這是保存在磁盤上的圖像:
正如您所看到的,圖像在預覽中完全拉伸,並且一旦保存在磁盤上就會錯誤地旋轉。
這是我的CameraPreview類(我混淆了其他方法,因為它們與相機參數無關):
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback
{
private SurfaceHolder surfaceHolder;
private Camera camera;
// Removed unnecessary code
public void surfaceCreated(SurfaceHolder holder)
{
camera.setPreviewDisplay(holder);
setCameraParameters();
camera.startPreview();
}
private void setCameraParameters()
{
Camera.Parameters parameters = camera.getParameters();
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(Camera.CameraInfo.CAMERA_FACING_BACK, info);
DisplayMetrics metrics = new DisplayMetrics();
WindowManager windowManager = (WindowManager)getContext().getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getMetrics(metrics);
int rotation = windowManager.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 rotate = (info.orientation - degrees + 360) % 360;
parameters.setRotation(rotate);
// Save Parameters
camera.setDisplayOrientation(90);
camera.setParameters(parameters);
}
}
為什么這條准確的代碼適用於除三星以外的其他設備?
我試圖在以下SO帖子上找到答案,但到目前為止沒有什么可以幫助我: 這一個和另一個 。
編輯
實施Joey Chong的答案並沒有改變任何事情:
public void onPictureTaken(final byte[] data, Camera camera)
{
try
{
File pictureFile = new File(...);
Bitmap realImage = BitmapFactory.decodeByteArray(data, 0, data.length);
FileOutputStream fos = new FileOutputStream(pictureFile);
realImage.compress(Bitmap.CompressFormat.JPEG, 100, fos);
int orientation = -1;
ExifInterface exif = new ExifInterface(pictureFile.toString());
int exifOrientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
switch (exifOrientation)
{
case ExifInterface.ORIENTATION_ROTATE_270:
orientation = 270;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
orientation = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_90:
orientation = 90;
break;
case ExifInterface.ORIENTATION_NORMAL:
orientation = 0;
break;
default:
break;
}
fos.close();
}
以下是我為工作設備獲得的EXIF結果:
這里是S4的結果:
這是因為手機仍然保存在風景中並將元數據設置為90度。 您可以嘗試檢查exif,在放入圖像視圖之前旋轉位圖。 要檢查exif,請使用以下內容:
int orientation = -1;
ExifInterface exif = new ExifInterface(imagePath);
int exifOrientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
switch (exifOrientation) {
case ExifInterface.ORIENTATION_ROTATE_270:
orientation = 270;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
orientation = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_90:
orientation = 90;
break;
case ExifInterface.ORIENTATION_NORMAL:
orientation = 0;
break;
default:
break;
}
我對保存的圖像有類似的問題。
我使用類似於這里描述的內容https://github.com/googlesamples/android-vision/issues/124由用戶kinghsumit(2016年9月15日的評論)。
我會在這里復制它,以防萬一。
private CameraSource.PictureCallback mPicture = new CameraSource.PictureCallback() {
@Override
public void onPictureTaken(byte[] bytes) {
int orientation = Exif.getOrientation(bytes);
Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
switch(orientation) {
case 90:
bitmapPicture= rotateImage(bitmap, 90);
break;
case 180:
bitmapPicture= rotateImage(bitmap, 180);
break;
case 270:
bitmapPicture= rotateImage(bitmap, 270);
break;
case 0:
// if orientation is zero we don't need to rotate this
default:
break;
}
//write your code here to save bitmap
}
}
public static Bitmap rotateImage(Bitmap source, float angle) {
Matrix matrix = new Matrix();
matrix.postRotate(angle);
return Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);
}
下面的類用於從byte []數據獲取方向。
public class Exif {
private static final String TAG = "CameraExif";
// Returns the degrees in clockwise. Values are 0, 90, 180, or 270.
public static int getOrientation(byte[] jpeg) {
if (jpeg == null) {
return 0;
}
int offset = 0;
int length = 0;
// ISO/IEC 10918-1:1993(E)
while (offset + 3 < jpeg.length && (jpeg[offset++] & 0xFF) == 0xFF) {
int marker = jpeg[offset] & 0xFF;
// Check if the marker is a padding.
if (marker == 0xFF) {
continue;
}
offset++;
// Check if the marker is SOI or TEM.
if (marker == 0xD8 || marker == 0x01) {
continue;
}
// Check if the marker is EOI or SOS.
if (marker == 0xD9 || marker == 0xDA) {
break;
}
// Get the length and check if it is reasonable.
length = pack(jpeg, offset, 2, false);
if (length < 2 || offset + length > jpeg.length) {
Log.e(TAG, "Invalid length");
return 0;
}
// Break if the marker is EXIF in APP1.
if (marker == 0xE1 && length >= 8 &&
pack(jpeg, offset + 2, 4, false) == 0x45786966 &&
pack(jpeg, offset + 6, 2, false) == 0) {
offset += 8;
length -= 8;
break;
}
// Skip other markers.
offset += length;
length = 0;
}
// JEITA CP-3451 Exif Version 2.2
if (length > 8) {
// Identify the byte order.
int tag = pack(jpeg, offset, 4, false);
if (tag != 0x49492A00 && tag != 0x4D4D002A) {
Log.e(TAG, "Invalid byte order");
return 0;
}
boolean littleEndian = (tag == 0x49492A00);
// Get the offset and check if it is reasonable.
int count = pack(jpeg, offset + 4, 4, littleEndian) + 2;
if (count < 10 || count > length) {
Log.e(TAG, "Invalid offset");
return 0;
}
offset += count;
length -= count;
// Get the count and go through all the elements.
count = pack(jpeg, offset - 2, 2, littleEndian);
while (count-- > 0 && length >= 12) {
// Get the tag and check if it is orientation.
tag = pack(jpeg, offset, 2, littleEndian);
if (tag == 0x0112) {
// We do not really care about type and count, do we?
int orientation = pack(jpeg, offset + 8, 2, littleEndian);
switch (orientation) {
case 1:
return 0;
case 3:
return 180;
case 6:
return 90;
case 8:
return 270;
}
Log.i(TAG, "Unsupported orientation");
return 0;
}
offset += 12;
length -= 12;
}
}
Log.i(TAG, "Orientation not found");
return 0;
}
private static int pack(byte[] bytes, int offset, int length, boolean littleEndian) {
int step = 1;
if (littleEndian) {
offset += length - 1;
step = -1;
}
int value = 0;
while (length-- > 0) {
value = (value << 8) | (bytes[offset] & 0xFF);
offset += step;
}
return value;
}
}
除了Nexus 5x之外,它對我有用,但這是因為該設備由於其構造而具有特殊問題。
我希望這可以幫助你!
我用過這個AndroidCameraUtil 。 它在這個問題上給了我很多幫助。
您可以嘗試使用Camera參數來修復旋轉問題。
Camera.Parameters parameters = camera.getParameters();
parameters.set("orientation", "portrait");
parameters.setRotation(90);
camera.setParameters(parameters);
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