我正在捕捉图像并将其设置为图像视图。
public void captureImage() {
Intent intentCamera = new Intent("android.media.action.IMAGE_CAPTURE");
File filePhoto = new File(Environment.getExternalStorageDirectory(), "Pic.jpg");
imageUri = Uri.fromFile(filePhoto);
MyApplicationGlobal.imageUri = imageUri.getPath();
intentCamera.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
startActivityForResult(intentCamera, TAKE_PICTURE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intentFromCamera) {
super.onActivityResult(requestCode, resultCode, intentFromCamera);
if (resultCode == RESULT_OK && requestCode == TAKE_PICTURE) {
if (intentFromCamera != null) {
Bundle extras = intentFromCamera.getExtras();
if (extras.containsKey("data")) {
bitmap = (Bitmap) extras.get("data");
}
else {
bitmap = getBitmapFromUri();
}
}
else {
bitmap = getBitmapFromUri();
}
// imageView.setImageBitmap(bitmap);
imageView.setImageURI(imageUri);
}
else {
}
}
public Bitmap getBitmapFromUri() {
getContentResolver().notifyChange(imageUri, null);
ContentResolver cr = getContentResolver();
Bitmap bitmap;
try {
bitmap = android.provider.MediaStore.Images.Media.getBitmap(cr, imageUri);
return bitmap;
}
catch (Exception e) {
e.printStackTrace();
return null;
}
}
但问题是，某些设备上的图像每次旋转时。例如，在三星设备上，它工作得很好，但在索尼Xperia上，图像旋转了90度，在东芝Thrive(平板电脑)上旋转了180度。
大多数手机摄像头都是横拍的，也就是说如果你用竖拍，拍出来的照片会旋转90度。在这种情况下，相机软件应该填充Exif数据，以显示照片的方向。
请注意，下面的解决方案取决于填充Exif数据的相机软件/设备制造商，因此它在大多数情况下都可以工作，但它不是100%可靠的解决方案。
ExifInterface ei = new ExifInterface(photoPath);
int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_UNDEFINED);
Bitmap rotatedBitmap = null;
switch(orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
rotatedBitmap = rotateImage(bitmap, 90);
break;
case ExifInterface.ORIENTATION_ROTATE_180:
rotatedBitmap = rotateImage(bitmap, 180);
break;
case ExifInterface.ORIENTATION_ROTATE_270:
rotatedBitmap = rotateImage(bitmap, 270);
break;
case ExifInterface.ORIENTATION_NORMAL:
default:
rotatedBitmap = bitmap;
}
下面是rotateImage方法:
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);
}
下面的代码与我一起工作，它从fileUri获得位图，并在需要时进行旋转固定:
private fun getCapturedImage(selectedPhotoUri: Uri): Bitmap {
val bitmap = when {
Build.VERSION.SDK_INT < 28 -> MediaStore.Images.Media.getBitmap(
this.contentResolver,
selectedPhotoUri
)
else -> {
val source = ImageDecoder.createSource(this.contentResolver, selectedPhotoUri)
ImageDecoder.decodeBitmap(source)
}
}
// If the image is rotated, fix it
return when (ExifInterface(contentResolver.run { openInputStream(selectedPhotoUri) }).getAttributeInt(
ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED)) {
ExifInterface.ORIENTATION_ROTATE_90 ->
Bitmap.createBitmap(bitmap, 0, 0, bitmap.width, bitmap.height, Matrix().apply {
postRotate(90F) }, true)
ExifInterface.ORIENTATION_ROTATE_180 ->
Bitmap.createBitmap(bitmap, 0, 0, bitmap.width, bitmap.height, Matrix().apply {
postRotate(180F) }, true)
ExifInterface.ORIENTATION_ROTATE_270 ->
Bitmap.createBitmap(bitmap, 0, 0, bitmap.width, bitmap.height, Matrix().apply {
postRotate(270F) }, true)
else -> bitmap
}
}
你可以像文档中的谷歌那样读取摄像头传感器的方向:https://developer.android.com/reference/android/hardware/camera2/CameraCharacteristics.html
SENSOR_ORIENTATION
Added in API level 21
Key<Integer> SENSOR_ORIENTATION
Clockwise angle through which the output image needs to be rotated to be upright on the device screen in its native orientation.
Also defines the direction of rolling shutter readout, which is from top to bottom in the sensor's coordinate system.
Units: Degrees of clockwise rotation; always a multiple of 90
Range of valid values:
0, 90, 180, 270
This key is available on all devices.
示例代码:
CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
int orientation = 0;
try {
String cameraId = manager.getCameraIdList()[0];
CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
orientation = characteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
}
catch (Exception e)
{
}
可悲的是，上面的@jason-robinson回答对我没用。
虽然旋转函数工作得很完美:
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);
}
我必须做以下事情来获得方向，因为Exif方向总是0
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode,resultCode,data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && data != null) {
Uri selectedImage = data.getData();
String[] orientationColumn = {MediaStore.Images.Media.ORIENTATION};
Cursor cur = managedQuery(imageUri, orientationColumn, null, null, null);
int orientation = -1;
if (cur != null && cur.moveToFirst()) {
orientation = cur.getInt(cur.getColumnIndex(orientationColumn[0]));
}
InputStream imageStream = getContentResolver().openInputStream(selectedImage);
Bitmap bitmap = BitmapFactory.decodeStream(imageStream);
switch(orientation) {
case 90:
bitmap = rotateImage(chosen_image_bitmap, 90);
break;
case 180:
bitmap = rotateImage(chosen_image_bitmap, 180);
break;
case 270:
bitmap = rotateImage(chosen_image_bitmap, 270);
break;
default:
break;
}
imageView.setImageBitmap(bitmap );
大多数手机摄像头都是横拍的，也就是说如果你用竖拍，拍出来的照片会旋转90度。在这种情况下，相机软件应该填充Exif数据，以显示照片的方向。
请注意，下面的解决方案取决于填充Exif数据的相机软件/设备制造商，因此它在大多数情况下都可以工作，但它不是100%可靠的解决方案。
ExifInterface ei = new ExifInterface(photoPath);
int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION,
ExifInterface.ORIENTATION_UNDEFINED);
Bitmap rotatedBitmap = null;
switch(orientation) {
case ExifInterface.ORIENTATION_ROTATE_90:
rotatedBitmap = rotateImage(bitmap, 90);
break;
case ExifInterface.ORIENTATION_ROTATE_180:
rotatedBitmap = rotateImage(bitmap, 180);
break;
case ExifInterface.ORIENTATION_ROTATE_270:
rotatedBitmap = rotateImage(bitmap, 270);
break;
case ExifInterface.ORIENTATION_NORMAL:
default:
rotatedBitmap = bitmap;
}
下面是rotateImage方法:
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);
}
