sorry!

hello, Michaelidle!

(wish this chat would beep when people enter...)

how can I help you today?

Hey Mark. Working for the first time with the "gallery". I'm trying to get the users camera photos and then display them in a list. So far, I can grab the photos and then I have a bunch of URI's. (storage/emulated/0/DCIM/Camera/img1.jpg etc). What's the best way to go from URI to ImageView?

ideally, use an image-loading library, like Picasso

as that will handle the background threading and stuff for you

you just hand the library the Uri and the ImageView, and it does the rest

this is particularly important if you are aiming to show more than one, using an AdapterView (e.g., ListView) or RecyclerView

I thought Picasso was for network images, but the fact that it just takes a URI also makes sense. Thanks

most of the image-loading libraries also handle HTTP(S) URLs

What if I wanted to go from URI to Drawable? Without a library. Would you happen to know off the top of your head about that? I forgot that the library I'm using doesn't use ImageViews directly, and I have to instead hand this API a drawable.

well, you could still use the library

but

beyond that, use ContentResolver and openInputStream() to get an InputStream

then, use BitmapFactory.decodeStream() to get a Bitmap

then wrap that in a BitmapDrawable

and, do all of that on a background thread

BitmapDrawable() constructor with a Drawable is deprecated. Should I be using something else?

there is no BitmapDrawable constructor that takes a Drawable

the current constructors take a Resources as the first parameter

it's not entirely clear why, in the case of the BitmapDrawable(Resources, Bitmap) constructor

but, getting a Resources is merely a matter of calling getResources() on your Activity or other Context

so, use that

I'm using "public BitmapDrawable (Bitmap bitmap)" and it says its deprecated.

correct

use public BitmapDrawable(Resources res, Bitmap bitmap)

Gotcha. Getting a java.io.FileNotFoundException: No content provider: /storage/emulated/0/DCIM/Camera/IMG_20160628_104908.jpg currently. So once I figure that out, I'll switch over.

that's not a Uri

a Uri has a scheme

that is a path

specifically, a filesystem path to a location on external storage

Oh hm. So I'm doing something wrong here.

where are you getting that value from?

the query is fine, but don't use DATA

instead, assemble the appropriate Uri

hold on a moment while I track down a code snippet

I knew I answered a question about this today...

in the answer, I point out some code from one of the book's sample apps, where I assemble the Uri to a video that I retrieve from MediaStore

you would do the same thing, except use MediaStore.Images.Media.EXTERNAL_CONTENT_URI instead of MediaStore.Videos.Media.EXTERNAL_CONTENT_URI

the benefit of this is that the Uri will work even for content that you cannot reach, such as images on removable storage

So when requesting the cursor, I'm essentially asking for the wrong thing? Path vs URI?

yes

and the path may not be usable (e.g., removable storage)

so, create the appropriate Uri, so you request the image from MediaStore itself

MediaStore has rights to access the image on the filesystem, even if your app does not

Okay. Let me try to refactor this real quick.

I can save the content uri as a String correct?

um, well, you will eventually need it back as a Uri

if by "save the content uri", you mean to a database or some persistent data store, you cannot count on being able to use it after your process terminates

So just using a List<Uri> would be best instead of making a List<String>

yes

I meant save as in, in memory/variable.

Getting compiler errors, but as I work through them. Does this look more in line of what you're talking about? http://pastebin.com/uN5KKNTm

no

Is it the projection that has to change?

ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, cursor.getInt(cursor.getColumnIndex(MediaStore.Images.Media._ID)));

My query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI uses the URI you were speaking of.

**This uri stuff is hard**

basically, I mean the code that I showed in the Stack Overflow answer that I pointed out (https://stackoverflow.com/a/38075698/115145) with the modification that I pointed out (MediaStore.Images replacing MediaStore.Videos in both locations)

withAppendedId() assembles the Uri from two pieces: the base (which is the Uri you used in your query) and the _ID of the particular entry you want (pulled from the Cursor)

Okay. I'll keep at it. Thanks for the help.

OK

you might want to look at the book sample that I listed in that answer, from the RecyclerView chapter

that's a wrap for today's chat

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have a pleasant day!