Uri.parse("file://" + ???)；访问特定的文件夹 [英] Uri.parse("file://" + ???); to access specific folder

问题描述

我的问题是两部分，我如何获得以下代码来访问此位置: "/storage/emulated/0/Movies/SpecificFolder"

My question is two part, how can I get the following code to access this location: "/storage/emulated/0/Movies/SpecificFolder"

代码:

private Uri getUriFromMediaStore(int position) {
        int dataIndex = mMediaStoreCursor.getColumnIndex(MediaStore.Files.FileColumns.DATA);

        mMediaStoreCursor.moveToPosition(position);

        String dataString = mMediaStoreCursor.getString(dataIndex);
        Uri mediaUri = Uri.parse("file://" + dataString);
        return mediaUri;
    }

，当时间到来时，如何从在线服务器访问视频/文件?

and, when the time comes how can I access videos/files from an online server?

我尝试了以下操作:

mediaCursor = getContentResolver().query( MediaStore.Files.getContentUri("external"), 
                null, 
                MediaStore.Images.Media.DATA + " like ? ", 
                new String[] {"%YOUR_FOLDER_NAME%"}, 
                null);

但是，只有在我的类继承了"Activity"，而我却从以下类继承时，才可以使用getContentResolver():

BUT, getContentResolver() can only be used if my class extends "Activity" which it does not, I am inheriting from:

RecyclerView.Adapter<MediaStoreAdapter.ViewHolder>

并且Java不允许双重继承.

and Java does not allow double inheritance.

推荐答案

我误解了代码的哪一部分需要编辑才能访问特定的文件夹.我正在尝试编辑代码部分，其中光标显示其选择/接收的缩略图，而当要做的是限制光标从哪里使用SQLite获取图像/视频时.

I was mistaken in which section of the code needed editing to access a specific folder. I was trying to edit the section of code where the cursor shows the thumbnails it has chosen/received, when what needs to be done is to limit where the cursor is getting the images/videos from using SQLite.

最初遵循本教程: https://www.youtube.com/watch?v= R23RBPkO8BY& list = PL9jCwTXYWjDJ6o1uabT54z1YmYYBh9US6& index = 6

在Nigel Henshaw对Codementor的帮助下，他能够提供此解决方案，并希望我分享: https://www.codementor.io/mobapptuts

And with Nigel Henshaw's help on Codementors, he was able to provide this solution and wanted me to share: https://www.codementor.io/mobapptuts

在MainActivity中，我们首先设置了游标:

In MainActivity, where we first set up the Cursor:

public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        String[] projection = {
                MediaStore.Files.FileColumns._ID,
                MediaStore.Files.FileColumns.DATE_ADDED,
                MediaStore.Files.FileColumns.DATA,
                MediaStore.Files.FileColumns.MEDIA_TYPE
        };
        String selection = MediaStore.Files.FileColumns.MEDIA_TYPE + "="
                + MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE
                + " OR "
                + MediaStore.Files.FileColumns.MEDIA_TYPE + "="
                + MediaStore.Files.FileColumns.MEDIA_TYPE_VIDEO
                + MediaStore.Video.Media.DATA;
        return new CursorLoader(
                this.getContext(),
                MediaStore.Files.getContentUri("external"),
                projection,
                selection,
                null,
                MediaStore.Files.FileColumns.DATE_ADDED + " DESC"
        );
    }

用于指定单个文件夹的代码:

The code to specify an individual folder:

public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        String[] projection = {
                MediaStore.Files.FileColumns._ID,
                MediaStore.Files.FileColumns.DATE_ADDED,
                MediaStore.Files.FileColumns.DATA,
                MediaStore.Files.FileColumns.MEDIA_TYPE
        };
        String selection = "(" + MediaStore.Files.FileColumns.MEDIA_TYPE + "="
                + MediaStore.Files.FileColumns.MEDIA_TYPE_IMAGE + " AND "
                + MediaStore.Images.Media.DATA + " LIKE ? )"
                + " OR "
                + "(" + MediaStore.Files.FileColumns.MEDIA_TYPE + "="
                + MediaStore.Files.FileColumns.MEDIA_TYPE_VIDEO + " AND "
                + MediaStore.Video.Media.DATA + " LIKE ? )";
        String [] selectionArgs = new String[] {"%SpecificFolder%", "%SpecificFolder%"};
        return new CursorLoader(
                this.getContext(),
                MediaStore.Files.getContentUri("external"),
                projection,
                selection,
                selectionArgs,
                MediaStore.Files.FileColumns.DATE_ADDED + " DESC"
        );
    }

此解决方案可处理您文件夹中的图像和视频.

This solution handles both Images and Videos in your folder.

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