我正在开发一个应用程序，我以纵向拍摄照片，问题是当我稍后检索图像时，它是横向的（图片已逆时针旋转90度）。我已经使用了下面的类，但是这里的方向每次都给0（零）。所以，我无法弄清楚如何解决它。
public Bitmap rotateBitmapOrientation(String photoFilePath) {
// Create and configure BitmapFactory
BitmapFactory.Options bounds = new BitmapFactory.Options();
bounds.inJustDecodeBounds = true;
BitmapFactory.decodeFile(file, bounds);
BitmapFactory.Options opts = new BitmapFactory.Options();
Bitmap bm = BitmapFactory.decodeFile(file, opts);
// Read EXIF Data
ExifInterface exif = new ExifInterface(file);
String orientString = exif.getAttribute(ExifInterface.TAG_ORIENTATION);
int orientation = orientString != null ? Integer.parseInt(orientString) : ExifInterface.ORIENTATION_NORMAL;
int rotationAngle = 0;
if (orientation == ExifInterface.ORIENTATION_ROTATE_90) rotationAngle = 90;
if (orientation == ExifInterface.ORIENTATION_ROTATE_180) rotationAngle = 180;
if (orientation == ExifInterface.ORIENTATION_ROTATE_270) rotationAngle = 270;
// Rotate Bitmap
Matrix matrix = new Matrix();
matrix.setRotate(rotationAngle, (float) bm.getWidth() / 2, (float) bm.getHeight() / 2);
Bitmap rotatedBitmap = Bitmap.createBitmap(bm, 0, 0, bounds.outWidth, bounds.outHeight, matrix, true);
// Return result
return rotatedBitmap;
}
答案 0 :(得分：1)
stackoverflow上有几种方法可用，但是我使用它们的混合方式，如果你想让图像处于捕获的方向，你可以使用以下指令和类来做到这一点
你的onActivityResult
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case SELECT_IMAGE_FROM_CAMERA:
if (requestCode == SELECT_IMAGE_FROM_CAMERA
&& resultCode == RESULT_OK) {
int targetW = reviewImageView.getWidth();
int targetH = reviewImageView.getHeight();
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(mCurrentPhotoPath, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int scaleFactor = Math.min(photoW / targetW, photoH / targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inPurgeable = true;
Bitmap rotatedBitmap = decodeFile(new File(mCurrentPhotoPath),
photoW, photoH, getImageOrientation(mCurrentPhotoPath));
reviewImageView.setImageBitmap(rotatedBitmap);
uploadMessage.setVisibility(View.INVISIBLE);
UploadSuccess.setVisibility(View.INVISIBLE);
} else if (requestCode == SELECT_IMAGE_FROM_CAMERA
&& resultCode == RESULT_CANCELED) {
mCurrentPhotoPath = null;
photo = null;
}
}
super.onActivityResult(requestCode, resultCode, data);
}
助手方法＆amp;类
public static int getImageOrientation(String imagePath) {
int rotate = 0;
try {
File imageFile = new File(imagePath);
ExifInterface exif = new ExifInterface(imageFile.getAbsolutePath());
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_270:
rotate = 270;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
rotate = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_90:
rotate = 90;
break;
}
} catch (IOException e) {
e.printStackTrace();
}
return rotate;
}
public static Bitmap decodeFile(File f, double REQUIRED_WIDTH,
double REQUIRED_HEIGHT, int rotation) {
try {
if (REQUIRED_WIDTH == 0 || REQUIRED_HEIGHT == 0) {
return BitmapFactory.decodeFile(f.getAbsolutePath());
} else {
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeFile(f.getAbsolutePath(), o);
o.inSampleSize = calculateInSampleSize(o, REQUIRED_WIDTH,
REQUIRED_HEIGHT);
o.inJustDecodeBounds = false;
o.inPurgeable = true;
Bitmap b = BitmapFactory.decodeFile(f.getAbsolutePath(), o);
if (rotation != 0)
b = rotate(b, rotation);
if (b.getWidth() > REQUIRED_WIDTH
|| b.getHeight() > REQUIRED_HEIGHT) {
double ratio = Math.max((double) b.getWidth(),
(double) b.getHeight())
/ (double) Math
.min(REQUIRED_WIDTH, REQUIRED_HEIGHT);
return Bitmap.createScaledBitmap(b,
(int) (b.getWidth() / ratio),
(int) (b.getHeight() / ratio), true);
} else
return b;
}
} catch (Throwable ex) {
ex.printStackTrace();
}
return null;
}
public static int calculateInSampleSize(BitmapFactory.Options options,
double reqWidth, double reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate the largest inSampleSize value that is a power of 2 and
// keeps both
// height and width larger than the requested height and width.
while ((height / inSampleSize) > reqHeight
|| (width / inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
inSampleSize = Math.max(1, inSampleSize / 2);
return inSampleSize;
}
public static Bitmap rotate(Bitmap b, int degrees) {
if (degrees != 0 && b != null) {
Matrix m = new Matrix();
m.setRotate(degrees, (float) b.getWidth() / 2,
(float) b.getHeight() / 2);
try {
Bitmap b2 = Bitmap.createBitmap(b, 0, 0, b.getWidth(),
b.getHeight(), m, true);
if (b != b2) {
b.recycle();
b = b2;
}
} catch (OutOfMemoryError ex) {
// We have no memory to rotate. Return the original bitmap.
}
}
return b;
}
您可以根据自己的需要自定义每种方法，我的代码遵循android指南，所以它非常冗长
答案 1 :(得分：0)
使用以下代码来解决您的问题 -
int rotate;
String URI = getImageURI();
try {
File file = new File(URI);
ExifInterface exif = new ExifInterface(
file.getAbsolutePath());
int orientation = exif.getAttributeInt(
ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_NORMAL);
Log.v("my", "Exif orientation: " + orientation);
switch (orientation) {
case ExifInterface.ORIENTATION_ROTATE_270:
Log.v("", "rotated " +270);
rotate = 270;
Log.e("rotate", ""+rotate);
ImageOrientation(file,rotate);
break;
case ExifInterface.ORIENTATION_ROTATE_180:
Log.v("", "rotated " +180);
rotate = 180;
Log.e("rotate", ""+rotate);
ImageOrientation(file,rotate);
break;
case ExifInterface.ORIENTATION_ROTATE_90:
Log.v("", "rotated " +90);
rotate = 90;
ImageOrientation(file,rotate);
break;
case 1:
Log.v("", "rotated1-" +90);
rotate = 90;
ImageOrientation(file,rotate);
break;
case 2:
Log.v("", "rotated1-" +0);
rotate = 0;
ImageOrientation(file,rotate);
break;
case 4:
Log.v("", "rotated1-" +180);
rotate = 180;
ImageOrientation(file,rotate);
break;
case 0:
Log.v("", "rotated 0-" +90);
rotate = 90;
ImageOrientation(file,rotate);
break;
}
filePath = file.getAbsolutePath();
} catch (Exception e) {
e.printStackTrace();
}
private void ImageOrientation(File file,int rotate){
try {
FileInputStream fis = new FileInputStream(file);
filePath = file.getAbsolutePath();
Bitmap photo = BitmapFactory.decodeStream(fis);
Matrix matrix = new Matrix();
matrix.preRotate(rotate); // clockwise by 90 degrees
photo = Bitmap.createBitmap(photo , 0, 0, photo.getWidth(), photo.getHeight(), matrix, true);
customerImageView.setImageBitmap(photo);
imageBitmap = photo;
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
希望它会对你有所帮助。