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Is it possible to use the asset picker within a scene.Scene (the thing that opens from the editor when you tap the '+' button)? Or do I need to create my own as a ui.View?

Edit:
Autocompletion errors.

There is no Python API for showing the asset picker, I'm afraid.

In that case, I guess I'll write my own. Is there a way of getting all the assets' names in a list or something?

try:
json.load(open(os.path.abspath(os.path.join(os.file,'../../Media/Collections.json'))))['collections']

which is a list of dicts. The path key is relative to the Media folder above.

I forgot to post a reply on this thread. Here's my take on an AssetPicker using the UI module. Hope someone can test it to make sure it works on other people's devices.
PS: I know the code looks horrible 😝

# coding: utf-8

import os
import json

import ui
import scene
import Image

def get_asset_folder():
    return os.path.dirname(scene.get_image_path('emj:Airplane'))[:-10]

def get_collection_info(asset_type=''):
    folder = get_asset_folder()
    with open(folder+os.listdir(folder)[0], 'r') as f:
        return [asset for asset in json.load(f)['collections'] if asset['type'] == asset_type]


class AssetPicker (ui.View):
    def __init__(self, source, name='', dark_cells=False, object_type='none', parent=None):
        w, h = ui.get_screen_size()
        self.frame = (0, 0, w, h)
        self.name = name
        self.source = source
        self.dark_cells = dark_cells
        self.parent = parent
        self.object_type = object_type
        self.picked_asset = None
        self.load_button_items()
        self.create_table_view()

    def is_main(self):
        return all([1 if isinstance(i, dict) else 0 for i in self.source])

    def load_button_items(self):
        if self.is_main():
            self.left_button_items = [ui.ButtonItem('Cancel', action=lambda s: self.navigation_view.close())]
        else:
            self.right_button_items = [ui.ButtonItem('Done', action=lambda s: self.navigation_view.close())]

    def create_table_view(self):
        table_view = ui.TableView()
        table_view.name = 'tableview'
        table_view.flex = 'WH'
        table_view.width = self.width
        table_view.height = self.height
        table_view.delegate = self
        table_view.data_source = self
        self.add_subview(table_view)

    def tableview_number_of_rows(self, tableview, section):
        return len(self.source)

    def tableview_cell_for_row(self, tableview, section, row):
        cell = ui.TableViewCell('subtitle')
        cell.accessory_type = 'disclosure_indicator'
        if self.is_main():
            text = self.source[row]['title']
            cell.text_label.text = text
            if 'copyright' in self.source[row]:
                cell.detail_text_label.text = self.source[row]['copyright']
        else:
            cell.text_label.text = self.source[row]
            tableview.row_height = 48
            cell.image_view.image = ui.Image.named(self.source[row])
            if self.dark_cells:
                cell.image_view.background_color = 'black'
        return cell

    def tableview_did_select(self, tableview, section, row):
        if not self.is_main():
            if self.parent:
                pass
                # do something with asset
            # example:
            Image.open(self.source[row]).show()
            self.navigation_view.close()
            return

        path = os.path.join(get_asset_folder(), self.source[row]['path'])
        if not os.path.isdir(path):
            with open(path, 'r') as f:
                source = eval(f.read())
        else:
            source = sorted(list(set([path.split('/')[-1]+':'+(i.split('@')[0] if '@' in i else i.split('.')[0]) for i in os.listdir(path)])))
        dark_cells = 1 if 'darkBackground' in self.source[row] else 0
        self.navigation_view.push_view(AssetPicker(source, name=self.source[row]['title'], dark_cells=dark_cells, object_type=self.object_type, parent=self.parent))


def present(parent=None, object_type='none', *args, **kwargs):
    source = get_collection_info(asset_type='image')
    main_view = AssetPicker(source, name='Assets', object_type=object_type, parent=parent)
    nav_view = ui.NavigationView(main_view)
    nav_view.present(*args, **kwargs)

if __name__ == '__main__':
    present(hide_title_bar=True)

@Sebastian it looks good on my iPhone 6Plus are you happy for me to use this code in a project I'm working on? Is this code on GitHub or just posted to the forum?

@shaun-h Go ahead and use it! I just posted it here in case any of you guys needed it 😄 I use it for my own project as well!
Now I'm curious! What kind of project are you working on? If you don't mind me asking 😋

Not at all, I put a post up a few days ago about it here
it is basically a workflow application for pythonista, you can have a read about it on the GitHub page
I am still adding lots of elements to it and the structure of those might change soon when I actually implement parameters, but just so you are aware I was thinking about using it to pick the icon on the creation of an element when I get around to creating the proper ui to create them.

Oh cool! I guess this can be used for a lot of different things. I use it in a level editor for a platformer game I'm developing. 😋