android - Android Oreo如何从uri获得真正的路径？

我用这段代码从一个uri获取真实的路径。它在工作
棉花糖但不在奥利奥：

private String getPathNew(Activity activity, Uri uri) {
    if (isDownloadsDocument(uri)) {
        final String id = DocumentsContract.getDocumentId(uri);
        final Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
        return getDataColumn(activity, contentUri, null, null);
    }
    return null;
}

public static String getDataColumn(Context context, Uri uri, String
selection, String[] selectionArgs) {
    Cursor cursor = null;
    final String column = "_data";
    final String[] projection = {column};
    try {
        cursor = context.getContentResolver().query(uri, projection, selection,
selectionArgs, null);
        if (cursor != null && cursor.moveToFirst()) {
            final int column_index = cursor.getColumnIndexOrThrow(column);
            return cursor.getString(column_index);
        }
    } finally {
        if (cursor != null)
            cursor.close();
    }
    return null;
}

我做错什么了？

最佳答案

 public static String getRealPathFromURI(Context context, Uri contentUri) {
    String[] proj = {MediaStore.Images.Media.DATA};
    Cursor cursor = context.getContentResolver().query(contentUri, proj, null, null,
                                                                               null);
    if (cursor != null) {
        int column_index =
        cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }
    return null;
}