this works on linux but not android.

gistfile1.txt

def change_image(instance, photo):
    """open selected image, resize and blit into texture"""
    global currentTexture
    ##try:
    img = PILImage.open(instance.selection[0])
    ##print img
    currentTexture = Texture.create(size= (180,240))
    img2 = img.resize((180,240), PILImage.BICUBIC)
    buf = img2.tostring()
    currentTexture.blit_buffer(buf, colorfmt='rgb', bufferfmt='ubyte')
    currentTexture.flip_vertical()
    texture1 = currentTexture.get_region(0,0,180,180)
    photo.texture = texture1
    #except: pass
    return True