我被困在相机中6天但没有得到任何适当的解决方案。当我通过相机意图捕获图像时，图像正在旋转。我试图修正方向，但有时它没有在onActivityResult（）中给出位图值。当我尝试在ImageView中设置图像时，它显示黑屏。这是我的代码请帮助我 -
//call intent to capture image
captureBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
try {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getActivity().getPackageManager()) != null)
{
startActivityForResult(takePictureIntent,AlletConstants.CAPTURE_RECEIPT_IMAGE);
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case AlletConstants.CAPTURE_RECEIPT_IMAGE:
if(data != null)
{
Uri qrcodeImageUri = data.getData();
bitmapReceiptImage = handleQrBarCodeImage(qrcodeImageUri);
mImageCaptureUri = AlletCommonUtility.bitmapToUri(getActivity(), bitmapReceiptImage);
doCrop();
AlletCommonUtility.showToast(getActivity(),"Uri = "+mImageCaptureUri);
}
break;
case AlletConstants.CROP_RECEIPT_FROM_CAMERA:
if(data != null)
{
Bundle qrcodeextras = data.getExtras();
if (qrcodeextras != null) {
Bitmap cropBitmap = qrcodeextras.getParcelable("data");
receiptImageView.setImageBitmap(cropBitmap);
bitmapReceiptImage = cropBitmap;
}
File qrcodeFile = new File(mImageCaptureUri.getPath());
if (qrcodeFile.exists())
qrcodeFile.delete();
}
break;
default:
break;
}
}
// use to get bitmap from uri
private Bitmap handleReceiptImage(Uri selectedImageUri)
{
String[] filePathColumn = {MediaStore.Images.Media.DATA };
Cursor cursor = getActivity().getContentResolver().query(selectedImageUri, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
picturePath = cursor.getString(columnIndex);
cursor.close();
Bitmap bitmap = setCameraImageRotation(picturePath);
return bitmap;
}
private Bitmap setCameraImageRotation(String picturePath)
{
Bitmap bitmapQrBarImage = null;
try {
File f = new File(picturePath);
ExifInterface exif = new ExifInterface(f.getPath());
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
AlletCommonUtility.showToast(getActivity(), "Orienattion = "+orientation);
Matrix mat = new Matrix();
mat.postRotate(getImageOrientation(orientation));
BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize= 4;
Bitmap bmp = BitmapFactory.decodeStream(new FileInputStream(f), null, options);
bitmapQrBarImage = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), mat, true);
if (bitmapQrBarImage != null) {
AlletCommonUtility.showToast(getActivity(), "CAMERA_PIC_SELECTION = "+bitmapQrBarImage);
}
}
catch (IOException e) {
Log.w("TAG", "-- Error in setting image");
}
catch(OutOfMemoryError oom) {
Log.w("TAG", "-- OOM Error in setting image");
}
return bitmapQrBarImage;
}
// Use to crop image
private void doCrop() {
final ArrayList<CropOption> cropOptions = new ArrayList<CropOption>();
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setType("image/*");
List<ResolveInfo> list = getActivity().getPackageManager().queryIntentActivities( intent, 0 );
int size = list.size();
if (size == 0) {
AlletCommonUtility.showToast(getActivity(), AlletMessage.NOT_CROP_IMAGE);
return;
} else {
intent.setData(mImageCaptureUri);
intent.putExtra("outputX", 200);
intent.putExtra("outputY", 200);
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("scale", true);
intent.putExtra("return-data", true);
if (size == 1) {
Intent i = new Intent(intent);
ResolveInfo res = list.get(0);
i.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
startActivityForResult(i, AlletConstants.CROP_RECEIPT_FROM_CAMERA);
} else {
for (ResolveInfo res : list) {
final CropOption co = new CropOption();
co.title = getActivity().getPackageManager().getApplicationLabel(res.activityInfo.applicationInfo);
co.icon = getActivity().getPackageManager().getApplicationIcon(res.activityInfo.applicationInfo);
co.appIntent= new Intent(intent);
co.appIntent.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
cropOptions.add(co);
}
CropOptionAdapter adapter = new CropOptionAdapter(getActivity(), cropOptions);
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Choose Crop App");
builder.setAdapter( adapter, new DialogInterface.OnClickListener() {
public void onClick( DialogInterface dialog, int item ) {
startActivityForResult( cropOptions.get(item).appIntent, AlletConstants.CROP_RECEIPT_FROM_CAMERA);
}
});
builder.setOnCancelListener( new DialogInterface.OnCancelListener() {
@Override
public void onCancel( DialogInterface dialog ) {
if (mImageCaptureUri != null ) {
getActivity().getContentResolver().delete(mImageCaptureUri, null, null );
mImageCaptureUri = null;
}
}
} );
AlertDialog alert = builder.create();
alert.show();
}
}
}
// use to rotate captured image from device camera
public static int getImageOrientation(int rotation)
{
int angle = 0;
switch (rotation) {
case 0:
angle = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_90:
angle = 90;
break;
case ExifInterface.ORIENTATION_ROTATE_180:
angle = 180;
break;
case ExifInterface.ORIENTATION_ROTATE_270:
angle = 270;
break;
default:
break;
}
return angle;
}
我在横向模式下获取图像，但在potrait模式下没有。拍摄图像后，相机预览会自动旋转90度。
答案 0 :(得分：2)
这是因为图像的EXIF数据。您需要使用旋转方法。
答案 1 :(得分：0)
根据您的内置摄像头方向和设备方向，图片将有不同的旋转。您可以通过ExifInterface检查特定图片的轮播。
/**
* @param filename Path to image file
* @param captureTime Time when image file was created
*/
public static int extractExifOrientationTagFromImageFile(String filename, long creationTime) {
/* The issue is on some devices, there's a bug that makes the picture taken saved in your app folder without proper
exif tags while a properly rotated image is saved in the android default folder (even though it shouldn't be).
Now what we do is recording the time when we're starting the camera app. Then we query
the Media Provider to see if any pictures were saved after this timestamp we've saved. That means most likely Android OS
saved the properly rotated picture in the default folder and of course put an entry in the media store and we can use the
rotation information from this row. */
int imageRotation = -1;
long imageFileSize = new File(filename).length();
Cursor mediaFileCursor = getContext().getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
new String[] { MediaStore.Images.ImageColumns.ORIENTATION, MediaStore.MediaColumns.SIZE },
MediaStore.MediaColumns.DATE_ADDED + " >= ?", new String[] { String.valueOf(creationTime / 1000 - 1) },
MediaStore.MediaColumns.DATE_ADDED + " DESC");
if((mediaFileCursor != null) && (mediaFileCursor.getCount() != 0)) {
while(mediaFileCursor.moveToNext()) {
long mediaFileSize = getLongFromCursor(mediaFileCursor, MediaStore.MediaColumns.SIZE);
// Extra check to make sure that we are getting the orientation from the proper file
if(mediaFileSize == imageFileSize) {
imageRotation = getIntFromCursor(mediaFileCursor, MediaStore.Images.ImageColumns.ORIENTATION);
break;
}
}
}
/* Now if the rotation at this point is still -1, then that means this is one of the devices with proper rotation information. */
if(imageRotation == -1) {
ExifInterface exif = null;
try {
exif = new ExifInterface(filename);
}
catch (IOException e) {
e.printStackTrace();
}
imageRotation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, -1);
}
return imageRotation;
}
private static final int COLUMN_NOT_EXISTS = -1;
public static Long getLongFromCursor(Cursor cursor, String columnName) {
int columnIndex;
if((columnIndex = cursor.getColumnIndex(columnName)) != COLUMN_NOT_EXISTS) {
return cursor.getLong(columnIndex);
}
else {
return null;
}
}
public static Integer getIntFromCursor(Cursor cursor, String columnName) {
int columnIndex;
if((columnIndex = cursor.getColumnIndex(columnName)) != COLUMN_NOT_EXISTS) {
return cursor.getInt(columnIndex);
}
else {
return null;
}
}
现在，当您进行图像旋转时，可以正确旋转它的位图：
int imageRotation = extractExifOrientationTagFromImageFile(lastCapturedMediaUriPath, cameraAppInvokeTime);
Matrix matrix = new Matrix();
switch(imageRotation) {
case ExifInterface.ORIENTATION_ROTATE_90:
matrix.postRotate(90);
break;
case ExifInterface.ORIENTATION_ROTATE_180:
matrix.postRotate(180);
break;
case ExifInterface.ORIENTATION_ROTATE_270:
matrix.postRotate(270);
break;
default:
break;
}
final Bitmap loadedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);