Screen animation problem

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There is a problem that the previous screen is erased to white when switching screens.

What MCU/Processor/Board and compiler are you using?

Visual studio 2017 simulation

What LVGL version are you using?


What do you want to achieve?

I hope it looks like the link below.

What have you tried so far?

I looked at the docs but couldn’t find a solution.

Code to reproduce

Add a code snippet which can run in the simulator. It should contain only the relevant code that compiles without errors when separated from your main code base.

The code block(s) should be formatted like:

lv_obj_t* btn1;
lv_obj_t* btn2;
    if ((obj == btn1) && (e == LV_EVENT_CLICKED))
        printf("forward btn clicked\n\r");
        lv_scr_load_anim(screen2, LV_SCR_LOAD_ANIM_MOVE_RIGHT, 500, 200, false);
      //  lv_scr_load(screen2);
    else if ((obj == btn2) && (e == LV_EVENT_CLICKED))
        printf("back btn clicked\n\r");
        lv_scr_load_anim(screen1, LV_SCR_LOAD_ANIM_MOVE_RIGHT, 500, 200, false);
    //    lv_scr_load(screen1);

void button_demo_main_window_create(lv_obj_t * p)
    LV_THEME_DEFAULT_INIT(lv_theme_get_color_primary(), lv_theme_get_color_secondary(),
        lv_theme_get_font_small(), lv_theme_get_font_small(), lv_theme_get_font_normal(), lv_theme_get_font_normal());
    _lv_obj_set_style_local_color(lv_scr_act(), LV_BTN_PART_MAIN, LV_STYLE_BG_COLOR, LV_COLOR_BLACK);
    screen1 = lv_scr_act(); //lv_obj_create(NULL, NULL);
    screen2 = lv_obj_create(NULL, NULL);

    _lv_obj_set_style_local_color(screen1, LV_BTN_PART_MAIN, LV_STYLE_BG_COLOR, LV_COLOR_YELLOW);
    _lv_obj_set_style_local_color(screen2, LV_BTN_PART_MAIN, LV_STYLE_BG_COLOR, LV_COLOR_BLUE);

   // button_demo_main_window_create(lv_scr_act());
    // lv_disp_set_default(screen1);

void scr1_create(void)

    lv_obj_t* la;
    btn1 = lv_btn_create(screen1, NULL);
    lv_obj_align(btn1, screen1, LV_ALIGN_CENTER, 0, 0);
    lv_obj_set_event_cb(btn1, button_event_cb);
    la = lv_label_create(btn1, NULL);
    lv_label_set_text(la, "SCREEN2");
    lv_obj_align(la, btn1, LV_ALIGN_CENTER, 0, 0);


void scr2_create(void)

    lv_obj_t* la;
    btn2 = lv_btn_create(screen2, NULL);
    lv_obj_align(btn2, screen2, LV_ALIGN_CENTER, 0, 0);
    lv_obj_set_event_cb(btn2, button_event_cb);
    la = lv_label_create(btn2, NULL);
    lv_label_set_text(la, "SCREEN1");
    lv_obj_align(la, btn2, LV_ALIGN_CENTER, 0, 0);

Screenshot and/or video

If possible, add screenshots and/or videos about the current state.

I think it’s because you are immediately calling lv_scr_load afterward; I could be wrong, but I think this is not necessary. Try just calling lv_scr_load_anim.

Thanks. embedded. It works fine.