Android Picture Viewer?

You can proceed as follows: gallery. SetOnItemClickListener(new OnItemClickListener() { ImageView iv = (ImageView)findViewById(R.id. ImageView1); public void onItemClick(AdapterView parent, View v, int position, long id) { final String fileName = "drawablename_" + position; final int resId = getResources().

GetIdentifier(fileName, "drawable", "your.package. Name"); iv. SetImageResource(resId); } }) This way this is just a matter of drawable naming convention: you call your drawables "drawablename_1", "drawablename_2", etc... and getIdentifier() retrieves their R ids for you.

You can proceed as follows: gallery. SetOnItemClickListener(new OnItemClickListener() { ImageView iv = (ImageView)findViewById(R.id. ImageView1); public void onItemClick(AdapterView parent, View v, int position, long id) { final String fileName = "drawablename_" + position; final int resId = getResources().

GetIdentifier(fileName, "drawable", "your.package. Name"); iv. SetImageResource(resId); } }); This way this is just a matter of drawable naming convention: you call your drawables "drawablename_1", "drawablename_2", etc... and getIdentifier() retrieves their R ids for you.

1 Be mindful that this sort of "lookup by name" is slow, but it may still be your best option if loading resources from the drawable folder. – jrobinson3k1 Jul 26 at 15:04 Perfect. Thanks a lot, great answer.

– Edd Jul 26 at 15:05 @jrobinson3k1 Yes, that's true (+1). It's only when you cannot determine your R identifier any other way than dynamically. - Edd, you are welcome!

– Shlublu Jul 26 at 15:08 It does say using getIdentifier is discouraged because it is so slow, although for this purpose I feel it will do just fine. Surely this is faster than using a 1000(0)+ entry switch statement anyway? – Edd Jul 26 at 15:17 Here, this will be calculated for only one image per user click, and a user clisk is really slow compared to the machine's performances.So this is OK.

But filling a complete array for all the images in a row using this method would probably take time, yes. And using a big switch() with all the R.Id would be way faster, but I definitely don't suggest going that way. Give a try first and see whether it actually needs optimization (I don't think it does in this specific use case).

– Shlublu Jul 26 at 15:20.

I would move your images you will be using to your Assets folder. You can load files from your asset folder as if they were just a plain ole directory, including pictures. Then when you need to show a picture, your OnClickListener would look like this: gallery.

SetOnItemClickListener(new OnItemClickListener() { ImageView iv = (ImageView)findViewById(R.id. ImageView1); public void onItemClick(AdapterView parent, View v, int position, long id) { String fileName = "sample_" + (position + 1); InputStream in = getAssets(). Open(fileName); Bitmap bm = BitmapFactory.

DecodeStream(in); iv. SetImageBitmap(bm); } }); Note that loading the picture is an O(1) operation.

Yes, that's a good idea. This is the way I would do too I think. – Shlublu Jul 26 at 15:39 Please explain why I would use this method as opposed to the one above, Thanks – Edd Jul 26 at 16:08 As I said at the end of my response, this is an O(1) operation, whereas the "lookup by name" method is most likely O(n).

If you're unfamiliar with O-notation, then to put it simply, it's faster :) – jrobinson3k1 Jul 26 at 16:10 I'll explain a little better. The "lookup by name" method has to potentially check every drawable in your folder before it finds the one you want because you're using a String reference to locate the file. Well, files in your resource directories are referenced by identifiers, not their actually names.So when you attempt to load by name, it has to check all your drawables until it finds a match, then give you the identifier associated with it so you can load it.

This method will go directly to the file where the image is stored and load it. – jrobinson3k1 Jul 26 at 16:19 I would add that this is also a question of design: if we don't intend to access the resources by their R identifiers but as files, it's better to use the Asset folder which is here for that purpose. And its true it is also faster as no "scan" is needed.

I don't know how getIdentifier() works internally, but it has to do things to retrieve the resources by their name and that are not needed here. – Shlublu Jul 26 at 16:29.

Keep an array of the IDs that is in the same order as the views in the gallery int picIDs = new int10; picIDs0 = R.drawable. Sample_1; picIDs1 = R.drawable. Sample_2; picIDs2 = R.drawable.

Sample_3; etc... Then in your click listener do something like this: public void onItemClick(AdapterView parent, View v, int position, long id) { iv. SetImageResource(picIDsposition); }.

Still requires a large block of code if I had thousands of photos... and requires the extra memory indexing them. – Edd Jul 26 at 15:05.

An easier way to create your int picIds array is: int picIds=new int{R.drawable. Sample_1,R.drawable. Sample_2,R.drawable.

Sample_3}.

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