Images.Media.query：java.lang.SecurityException：Permission Denial：打开提供程序

Question

因此，当我检查图像是否仍然存在时，我似乎收到了权限错误。在我的应用程序中，我将图像（路径（URI），而不是实际图像）添加到数据库记录。他们来自画廊/相机。在我们与服务器同步之前，我们使用以下方法检查图像是否仍然存在。

似乎没有人在Android 6之后找到该文件。我们在 Images.Media.query 上收到权限错误？我花了很多时间来讨论这个问题，但这一切似乎都围绕着意图。

 public boolean doesPhotoExist(final Photo p) {
        // checks Image media store for image existence

        Cursor c = null;
        try {
            Log.d("doesPhotoExist", "Photo " + p.getImageId() + " has imageLocation " + p.getImageLocation());
            if ((p == null) || ToolBelt.isNullorEmpty(p.getImageLocation())) {
                return false;
            }

            String imgLoc = p.getImageLocation();
            File file = new File(imgLoc);

            if (file.exists()) {
                //file exists on the file system - absolute path
                return true;
            }
            if (isGcMediaImage(p)) {
                //should have existed on teh file sytem
                return false;
            } else {
                c = Images.Media.query(mContext.getContentResolver(), Uri.parse(p.getImageLocation()), null);
            }

            if (c == null || c.getCount() == 0) {
                return false;
            }

            if (c.getCount() != 1) {
                throw new AssertionError("More than one object returned from primary key query");
            }

            c.moveToFirst();

            //It looks like for signatures(for Transfer Order questions), the file size is always 0 (even if the file is valid and exists), however,
            //the MediaColumns.DATA column has a positive value.So, if we have come this far in this method and there does
            //exist a record as per query above, it seems safe to return true in this particular case when actual data size is a positive value.
            //Signatures are not displayed in SurveyCheckImage screen.
            if (p.isSignature()) {
                byte[] data = c.getBlob(c.getColumnIndex(MediaColumns.DATA));
                if (data != null && data.length > 0) {
                    return true;
                }
            }

            return c.getInt(c.getColumnIndex(MediaColumns.SIZE)) > 0;

        } catch (SecurityException e) {
            Log.e(tag(), "problem accessing media " + e);
            return false;
        } finally {
            if ((c != null) && !c.isClosed()) {
                c.close();
            }
        }
    }