android - 从画廊方向选择的 Android 图像始终为 0：Exif TAG

Question

当我从图库中选择图像以将其设置在 android 应用程序的 imageview 上时，我看到它反转了 180 或 270 或 90 度。
因此，为了检查/解决这个问题，我使用EXIF了方向，但它总是给我“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。也不matrix.postROTATE旋转位图。我不知道为什么。

谢谢

score 28 · Accepted Answer

获得所选图像的 Uri 后，使用此方法调用以下函数，
像这样，

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

要包含在您的活动中的两个功能是，

 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，请使用以下命令：

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;
            }
        }
    }

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 60、100X100 然后 100 @Dhrupal

score 2 · Accepted Answer

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查询MediaStore.Images.ImageColumns.DATA哪个值是图像的实际路径。

实际上，如果您只想获取方向，则不必从 Exif 中获取，只需查询的值MediaStore.Images.ImageColumns.ORIENTATION即可。

score 2 · Accepted Answer

已经很久没有提问了。但我反驳了同样的问题，并解决了这个问题。当您将文件路径放入 exifInterface 的构造函数时，请使用真实路径，例如“/storage/sdcard0/DCIM/Camera/blahbalh.jpg”，而不是使用 /content:/media/external/images/media/blah 之类的东西，这会给出总是 0 信息。希望有人会得到帮助。研究生。

哎呀。下面一个是相同的方法。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);
}

score 1 · Accepted Answer

您应该使用 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;
}

score 1 · Accepted Answer

试试下面的代码： -

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;
}

score 0 · Accepted Answer

我无法让光标或 Exif 接口方法为我工作。我无法获得三星前后摄像头的可靠旋转数。

对于那些寻找适用于三星和其他主要制造商的前置和后置摄像头解决方案的人来说，nvhausid 的这个答案很棒：

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

对于那些不想点击的人来说，相关的魔法是使用 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。

score -1 · Accepted Answer

捕获图像时，它将 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;

score -2 · Accepted Answer

您是否已经检查过您是否在清单中设置了写入和读取权限？因为如果您没有设置它们，您将无法访问位图的 exif 数据，我说的是 android M。这是基于其 exif 数据旋转位图的片段。

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;
    }


}

android - 从画廊方向选择的 Android 图像始终为 0：Exif TAG

8 回答 8

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