Android : file in and out usb/sdcard - android

Can someone please point me in the right direction. I have been googling for ages and I'm not getting great results.
I want my app to allow the user to download a file from the USB/SDcard. Specifically an image, which then later gets used in my app.
I can't seem to find anything, been searching for open file dialogs and nothing..
So:
1) User inserts USB device/SDCard.
2) User gets file browser dialog.
3) User finds image from USB/SDCard
4) App grabs image and stores it for later use.
Thanks :)

I think what you are looking for is how to work with external storage in Android. there is a very good tutorial from android site: http://developer.android.com/guide/topics/data/data-storage.html#filesExternal. hope this helps.

To browse for images on the SDCard this thread is very helpful:
How to pick an image from gallery (SD Card) for my app?
I would suggest using the Android Gallery interface for images as it is much easier for the user than browsing files.

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Currently I want to make a list like pictures and images on the server when I click on it, it will download the images to the memory device. If the image is downloaded, it will not download again and the image that is not there will be downloaded. Then I want to ask for a solution from everyone, how should I handle the download to be clean and good for performance. Or do you have an example for me to refer to? Thank you!
There are some ways to find out if your image already exists in your phone storage but the best way to find it out is by image name, compare image names before downloading.

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When you send/recieve a sticker, it doesnt really send it, just opens the image from the local store from your phone.
What I did on my Android is download a stickers set that I dont like.
Connect the phone to the computer and open the vyber folder, and search for the folder containing the set I downloaded.
Then I uploaded my custom stickers to this folder using the same names to overwrite the files.
Since vyber doesnt send the stickers, when you send the custom sticker people dont see your stikers, they see the original files on their phones. So I repeat the process on the phones of my boyfriend and my sister.
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Imran.
Store the PDF on internal storage. You are presently storing the PDF on external storage.

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Thank you.
Here is a link to get you started.
http://developer.android.com/resources/tutorials/views/hello-gallery.html
and this one will give you a rough idea too. Of course, you will have to improvise later to make it function just the way you want it to.
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