从 MediaStore.Images.Media.DATA 获取图像的方向 [英] get orientation of image from MediaStore.Images.Media.DATA

问题描述

我有用于图像的 MediaStore.Images.Media.DATA uri 如何使用该 uri 获取 MediaStore.Images.ImageColumns.ORIENTATION ?我收到 NullPointerException 异常.

i have MediaStore.Images.Media.DATA uri for an image how I can get MediaStore.Images.ImageColumns.ORIENTATION using that uri ? I am getting a NullPointerException.

以下是我的代码，

private  int getOrientation(Context context, Uri photoUri) {

Log.v("orientatioon", "not crashed01");
Cursor cursor = context.getContentResolver().query(photoUri,
        new String[] { MediaStore.Images.ImageColumns._ID,MediaStore.Images.ImageColumns.ORIENTATION }, null, null, null);
Log.v("orientatioon", "not crashed02");


cursor.moveToFirst();
Log.v("orientatioon", "not crashed 03");
int i=cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Images.ImageColumns.ORIENTATION));
Log.v("orientatioon", ""+i);
cursor.close();
return i;
}

我在 cursor.moveToFirst() 代码行收到 NullPointerException.

I am getting a NullPointerException at cursor.moveToFirst() line of code.

推荐答案

使用这个method获得Orientation

public static int getExifOrientation(String filepath) {// YOUR MEDIA PATH AS STRING
        int degree = 0;
        ExifInterface exif = null;
        try {
            exif = new ExifInterface(filepath);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        if (exif != null) {
            int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, -1);
            if (orientation != -1) {
                switch (orientation) {
                case ExifInterface.ORIENTATION_ROTATE_90:
                    degree = 90;
                    break;
                case ExifInterface.ORIENTATION_ROTATE_180:
                    degree = 180;
                    break;
                case ExifInterface.ORIENTATION_ROTATE_270:
                    degree = 270;
                    break;
                }

            }
        }
        return degree;
    }

这篇关于从 MediaStore.Images.Media.DATA 获取图像的方向的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！