Hello,
I made a screen composed of buttons and images. The background image is load and then the button.
Only the button are refresh. Here is the code I use to refresh my image 
if (!image_load(image, image_path)) {
return false;
}
if (obj == NULL) { obj = lv_img_create(parent, NULL); }
lv_obj_add_style(obj, LV_IMG_PART_MAIN, style);
lv_obj_set_pos(obj, px, py);
lv_obj_set_size(obj, width, height);
lv_obj_set_click(obj, true);
background->data = image->data;
lv_img_set_src(obj, background);
lv_img_set_pivot(obj, 0, 0);
lv_img_set_angle(obj, 0);
lv_img_set_src(obj, background);
///////////
// Load focused image
char image_path[512];
strcpy(image_path, folder_image_path);
strcat(image_path, "/image_0.png");
if (!image_load(image_focused, image_path)) {
return false;
}
background_focused->data = image_focused->data;
///////////
// Load defocused image
strcpy(image_path, folder_image_path);
strcat(image_path, "/image2.png");
if (!image_load(image_defocused, image_path)) {
return false;
}
background_defocused->data = image_defocused->data;
LOGI(TAG, "screen_button_load: Create button object00");
if (obj == NULL) {
LOGI(TAG, "screen_button_load: Create button object");
obj = (lv_obj_t*) malloc(sizeof(lv_obj_t));
obj = lv_imgbtn_create(parent, NULL);
lv_obj_add_style(obj, LV_IMGBTN_PART_MAIN, style);
lv_obj_set_pos(obj, px, py);
lv_obj_set_size(obj, width, height);
}
lv_imgbtn_set_src(obj, LV_BTN_STATE_RELEASED, background_defocused);
lv_imgbtn_set_src(
obj, LV_BTN_STATE_CHECKED_RELEASED, background_defocused);
lv_imgbtn_set_src(obj, LV_BTN_STATE_PRESSED, background_focused);
lv_imgbtn_set_src(
obj, LV_BTN_STATE_CHECKED_PRESSED, background_focused);
lv_imgbtn_set_checkable(obj, true);
My problem is my background is not refresh but the foreground buttons are refresh.