从图库中选择的 Android 图像方向始终为 0:Exif TAG [英] Android image selected from gallery Orientation is always 0 : Exif TAG

问题描述

当我从图库中选择一个图像并将其设置在我的 android 应用程序中的 imageview 上时，我看到 它倒转了 180、270 或 90 度.
所以要检查/解决这个问题我使用了 EXIF 方向，但它总是给我0".

When I pick an image from gallery to set it on my imageview in android application then I see that it comes inverted by 180 or 270 or 90 degress.
So to check/solve this I used EXIF orientations, but it always gives me "0".

我不知道问题出在哪里.

I am not able to get what is the problem.

代码:

Uri selectedImageUri = data.getData();

                    absolutePath = selectedImageUri.getPath();

                    exifMedia = new ExifInterface(absolutePath);
                    String exifOrint = exifMedia.getAttribute(ExifInterface.TAG_ORIENTATION);

                    exifOrientation = Integer.parseInt(exifOrint);

                    System.out.println("Orientation Tag is:"+exifOrientation);

                    /** Convert URI into byte */
                    ContentResolver cr = getBaseContext()
                    .getContentResolver();
                    InputStream inputStream = cr
                    .openInputStream(selectedImageUri);
                    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);

                    rotatedBMP = getResizedBitmapImage(
                            bitmap, 100, 100,exifOrientation);

                    ByteArrayOutputStream stream = new ByteArrayOutputStream();
                    rotatedBMP.compress(Bitmap.CompressFormat.PNG, 100,
                            stream);
                    byteArray = stream.toByteArray();
                    mimProfileImageBrowse.setImageBitmap(rotatedBMP);

方法:

public  Bitmap getResizedBitmapImage(Bitmap bm, int newHeight, int newWidth, int exifOrientation) {
        int width = bm.getWidth();
        int height = bm.getHeight();
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
        /**
         *  create a matrix for the manipulation
         */

        Matrix matrix = new Matrix();
        /**
         *  resize the bit map
         */


        /*

         1 = Horizontal (normal) 
2 = Mirror horizontal 
3 = Rotate 180 
4 = Mirror vertical 
5 = Mirror horizontal and rotate 270 CW 
6 = Rotate 90 CW 
7 = Mirror horizontal and rotate 90 CW 
8 = Rotate 270 CW

         */


        switch (exifOrientation) {
        case ExifInterface.ORIENTATION_ROTATE_270:

            rotate = 270;

            break;


        case ExifInterface.ORIENTATION_ROTATE_180:

            rotate = 180;


            break;

        case ExifInterface.ORIENTATION_ROTATE_90:

            rotate = 90;

            break;

        case ExifInterface.ORIENTATION_TRANSPOSE:

            rotate = 45;

            break;

        default:
            break;
        }


        matrix.postScale(scaleWidth, scaleHeight);
        matrix.postRotate(rotate);

        /**
         * recreate the new Bitmap
         */
        Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
        resizedBitmap = Bitmap.createScaledBitmap(bm, 65, 65, true);

        return resizedBitmap;

    }

请帮忙.另外 matrix.postROTATE 不会旋转位图.我不知道为什么.

Please help. Also matrix.postROTATE is not rotating the bitmaps. I dont know why.

谢谢

推荐答案

在获得所选图像的 Uri 后，使用此方法调用以下函数，
像这样，

After you get Uri of selected Image call the below functions using this methods,
Like this,

Uri selectedImageUri = data.getData();
Bitmap bitmap = scaleImage(this,selectedImageUri);

要包含在您的活动中的两个功能是，

The two functions to include in your activity are,

 public static Bitmap scaleImage(Context context, Uri photoUri) throws IOException {
        InputStream is = context.getContentResolver().openInputStream(photoUri);
        BitmapFactory.Options dbo = new BitmapFactory.Options();
        dbo.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(is, null, dbo);
        is.close();

        int rotatedWidth, rotatedHeight;
        int orientation = getOrientation(context, photoUri);

        if (orientation == 90 || orientation == 270) {
            rotatedWidth = dbo.outHeight;
            rotatedHeight = dbo.outWidth;
        } else {
            rotatedWidth = dbo.outWidth;
            rotatedHeight = dbo.outHeight;
        }

        Bitmap srcBitmap;
        is = context.getContentResolver().openInputStream(photoUri);
        if (rotatedWidth > MAX_IMAGE_DIMENSION || rotatedHeight > MAX_IMAGE_DIMENSION) {
            float widthRatio = ((float) rotatedWidth) / ((float) MAX_IMAGE_DIMENSION);
            float heightRatio = ((float) rotatedHeight) / ((float) MAX_IMAGE_DIMENSION);
            float maxRatio = Math.max(widthRatio, heightRatio);

            // Create the bitmap from file
            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inSampleSize = (int) maxRatio;
            srcBitmap = BitmapFactory.decodeStream(is, null, options);
        } else {
            srcBitmap = BitmapFactory.decodeStream(is);
        }
        is.close();

        /*
         * if the orientation is not 0 (or -1, which means we don't know), we
         * have to do a rotation.
         */
        if (orientation > 0) {
            Matrix matrix = new Matrix();
            matrix.postRotate(orientation);

            srcBitmap = Bitmap.createBitmap(srcBitmap, 0, 0, srcBitmap.getWidth(),
                    srcBitmap.getHeight(), matrix, true);
        }

        String type = context.getContentResolver().getType(photoUri);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        if (type.equals("image/png")) {
            srcBitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
        } else if (type.equals("image/jpg") || type.equals("image/jpeg")) {
            srcBitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        }
        byte[] bMapArray = baos.toByteArray();
        baos.close();
        return BitmapFactory.decodeByteArray(bMapArray, 0, bMapArray.length);
    }

    public static int getOrientation(Context context, Uri photoUri) {
        /* it's on the external media. */
        Cursor cursor = context.getContentResolver().query(photoUri,
                new String[] { MediaStore.Images.ImageColumns.ORIENTATION }, null, null, null);

        if (cursor.getCount() != 1) {
            return -1;
        }

        cursor.moveToFirst();
        return cursor.getInt(0);
    }

要从文件中获取 Uri，请使用:

To get Uri from File use this :

public static Uri getImageContentUri(Context context, File imageFile) {
        String filePath = imageFile.getAbsolutePath();
        Cursor cursor = context.getContentResolver().query(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                new String[] { MediaStore.Images.Media._ID },
                MediaStore.Images.Media.DATA + "=? ",
                new String[] { filePath }, null);
        if (cursor != null && cursor.moveToFirst()) {
            int id = cursor.getInt(cursor
                    .getColumnIndex(MediaStore.MediaColumns._ID));
            Uri baseUri = Uri.parse("content://media/external/images/media");
            return Uri.withAppendedPath(baseUri, "" + id);
        } else {
            if (imageFile.exists()) {
                ContentValues values = new ContentValues();
                values.put(MediaStore.Images.Media.DATA, filePath);
                return context.getContentResolver().insert(
                        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
            } else {
                return null;
            }
        }
    }

<小时>

问.你能告诉我什么是MAX_IMAGE_DIMENSION"吗?– Dhrupal 2013 年 3 月 13 日A. 它基于您的图像视图大小或您想要显示的图像大小.. 无论是 60X60 然后是 60、100X100 然后是 100 @Dhrupal

---

Q. Can you plz tell me what is "MAX_IMAGE_DIMENSION"? – Dhrupal Mar 13 '13 A. its based on your imageview size or the image size what you want to show.. whatever it is 60X60 then 60, 100X100 then 100 @Dhrupal

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