Question

当我从图库中选择一个图像以在Android应用程序中的我的imageview上设置它时，我发现它被反转180或270或90度。所以检查/解决我使用EXIF方向，但总是给我“0”。

我无法解决问题所在。

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。此外matrix.postROTATE不会旋转位图。我不知道为什么。

由于

Answer 1

获得所选图像的Uri后，使用此方法调用以下功能，
像这样，

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

您的活动中包含的两个功能是，

 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：

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;
            }
        }
    }

Q值。你能告诉我什么是“MAX_IMAGE_DIMENSION”吗？ - Dhrupal 2013年3月13日 A.它基于你想要显示的图像视图大小或图像大小..无论是60X60然后60,100X100然后100 @Dhrupal

Answer 2

我猜你不应该使用“selectedImageUri.getPath()”来获取路径，因为它并没有真正返回图像文件路径。相反，您应该使用ContentResolver来查询MediaStore.Images.ImageColumns.DATA的值，这是图像的实际路径。

实际上，如果您只想获得方向，则无需从Exif获取该方向，只需查询MediaStore.Images.ImageColumns.ORIENTATION的值就可以为您提供。

Answer 3

自提问以来已经很久了。但我反击同样的问题，并解决了这个问题。当你把文件路径放到exifInterface的构造函数中时，使用真实的路径，比如“/storage/sdcard0/DCIM/Camera/blahbalh.jpg”，而不是像/ content：/ media / external / images / media / blah这样的东西。总是0信息。希望有人会得到帮助。 regrads。

糟糕。下面是一个相同的方法。而且还有更多。用这个。

/**
 * @ref http://stackoverflow.com/questions/3401579/get-filename-and-path-from-uri-from-mediastore
 * @param contentUri
 * @return
 */
public String getRealPathFromURI(Uri contentUri) {
    String[] proj = { MediaStore.Images.Media.DATA };
    Cursor cursor = getContentResolver().query(contentUri, proj, null, null, null);
    int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
    cursor.moveToFirst();
    return cursor.getString(column_index);
}

Answer 4

尝试以下代码： -

ExifInterface exif = new ExifInterface(filename);  
int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED);  
Bitmap bmRotated = rotateBitmap(bitmap, orientation);

调用以下方法： -

public static Bitmap rotateBitmap(Bitmap bitmap, int orientation) {

    try{
        Matrix matrix = new Matrix();
        switch (orientation) {
            case ExifInterface.ORIENTATION_NORMAL:
                return bitmap;
            case ExifInterface.ORIENTATION_FLIP_HORIZONTAL:
                matrix.setScale(-1, 1);
                break;
            case ExifInterface.ORIENTATION_ROTATE_180:
                matrix.setRotate(180);
                break;
            case ExifInterface.ORIENTATION_FLIP_VERTICAL:
                matrix.setRotate(180);
                matrix.postScale(-1, 1);
                break;
            case ExifInterface.ORIENTATION_TRANSPOSE:
                matrix.setRotate(90);
                matrix.postScale(-1, 1);
                break;
           case ExifInterface.ORIENTATION_ROTATE_90:
               matrix.setRotate(90);
               break;
           case ExifInterface.ORIENTATION_TRANSVERSE:
               matrix.setRotate(-90);
               matrix.postScale(-1, 1);
               break;
           case ExifInterface.ORIENTATION_ROTATE_270:
               matrix.setRotate(-90);
               break;
           default:
               return bitmap;
        }
        try {
            Bitmap bmRotated = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            bitmap.recycle();
            return bmRotated;
        }
        catch (OutOfMemoryError e) {
            e.printStackTrace();
            return null;
        }
    }
    catch (IOException e) {
        e.printStackTrace();
        return null;
    }
    return bitmap;
}

Answer 5

你应该使用getRealPathFromURI函数：

public static String getRealPathFromURI(Context context, Uri uri,
            String data) {

    String[] largeFileProjection = { MediaStore.Images.ImageColumns._ID,
            MediaStore.Images.ImageColumns.DATA };

    String largeFileSort = MediaStore.Images.ImageColumns._ID + " DESC";
    Cursor myCursor = context.getContentResolver().query(
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            largeFileProjection, null, null, largeFileSort);
    String largeImagePath = "";
    try {
        myCursor.moveToFirst();
        largeImagePath = myCursor
                .getString(myCursor
                        .getColumnIndexOrThrow(MediaStore.Images.ImageColumns.DATA));
    } finally {
        myCursor.close();
    }

    return largeImagePath;
}

Answer 6

我无法使用光标或Exif界面方法为我工作。我无法为三星的前后摄像头获得可靠的旋转数字。

对于寻求适用于三星和其他主要制造商的前后摄像头解决方案的人来说，nvhausid的答案非常棒：

https://stackoverflow.com/a/18915443/6080472

对于那些不想点击的人，相关的魔力是使用CameraInfo，而不是依赖EXIF。

Bitmap realImage = BitmapFactory.decodeByteArray(data, 0, data.length);
android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(mCurrentCameraId, info);
Bitmap bitmap = rotate(realImage, info.orientation);

链接中的完整代码。

Answer 7

捕获图像时，它会将exif数据存储为有关旋转类型（纵向 - 横向）的信息。因此，您唯一需要检查的是exif数据：

ExifInterface exifData = new ExifInterface(uri);
        int orientation = exifData.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
        Matrix matrix;
        switch (orientation) {
        case 6:
             matrix = new Matrix();
            matrix.postRotate(90);
            bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            break;
        case 3:
             matrix = new Matrix();
            matrix.postRotate(180);
            bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            break;
        case 8:
            matrix = new Matrix();
            matrix.postRotate(270);
            bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            break;
        default:
            break;

Answer 8

您是否已检查过清单中是否设置了“写入”和“读取”权限？因为如果你没有设置它们你就无法访问你位图的exif数据，我说的是android M. 这是根据其exif dada旋转位图的片段。

public static Bitmap rotateBitmap(String filePath, Bitmap bitmap) {
    ExifInterface exif;
    try {
        exif = new ExifInterface(filePath);

        int orientation = exif.getAttributeInt(
                ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
        Log.d("EXIF", "Exif: " + orientation);
        Matrix matrix = new Matrix();
        if (orientation == 6) {
            matrix.postRotate(90);
            Log.d("EXIF", "Exif: " + orientation);
        } else if (orientation == 3) {
            matrix.postRotate(180);
            Log.d("EXIF", "Exif: " + orientation);
        } else if (orientation == 8) {
            matrix.postRotate(270);
            Log.d("EXIF", "Exif: " + orientation);
        }
        return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }


}

从图库Orientation中选择的Android图像始终为0：Exif TAG

8 个答案: