LVGL8.2 Simple Checkboxes

Event callback function

static void event_handler(lv_event_t* e)
{
    
    lv_event_code_t code = lv_event_get_code(e); //  Get the event code of the response object 
    lv_obj_t* obj = lv_event_get_target(e);  //  Get the object that responds to the event 
    if (code == LV_EVENT_VALUE_CHANGED) {
      // Process value changed event 
        const char* txt = lv_checkbox_get_text(obj);  // Get event object checkbox Text content of 
        const char* state = lv_obj_get_state(obj) & LV_STATE_CHECKED ? "Checked" :"Unchecked"; //  Get whether the event object is selected 
        LV_LOG_USER("%s: %s", txt, state);  //  Print status content 
    }
}

Create multiple checkbox

static void lv_example_checkbox_1(void)
{
    
    lv_obj_set_flex_flow(lv_scr_act(), LV_FLEX_FLOW_COLUMN); //  Current active interface settings LV_FLEX_FLOW_COLUMN Way layout 
    lv_obj_set_flex_align(lv_scr_act(), LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_START, LV_FLEX_ALIGN_CENTER); // main axis alignment LV_FLEX_ALIGN_CENTER,cross axis Placement LV_FLEX_ALIGN_START,cross direction alignment LV_FLEX_ALIGN_CENTER
    lv_obj_t* cb;
    cb = lv_checkbox_create(lv_scr_act());  // establish checkbox object 
    lv_checkbox_set_text(cb, "Apple");  // Set text content Apple
    lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL); // Add all events 
    cb = lv_checkbox_create(lv_scr_act());  // establish checkbox object 
    lv_checkbox_set_text(cb, "Banana"); // Set text content Banana
    lv_obj_add_state(cb, LV_STATE_CHECKED); // Set the selected state 
    lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL); // Add all events 
    cb = lv_checkbox_create(lv_scr_act());  // establish checkbox object 
    lv_checkbox_set_text(cb, "Lemon"); // Set text content Lemon
    lv_obj_add_state(cb, LV_STATE_DISABLED);  // Set up Disabled state 
    lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL); // Add all events 
    cb = lv_checkbox_create(lv_scr_act());  // establish checkbox object 
    lv_obj_add_state(cb, LV_STATE_CHECKED | LV_STATE_DISABLED); // Set up CHECKEDTT and Disabled state 
    lv_checkbox_set_text(cb, "Melon\nand a new line");// Set text content Melon\nand a new line"
    lv_obj_add_event_cb(cb, event_handler, LV_EVENT_ALL, NULL);// Add all events 
    lv_obj_update_layout(cb);  //  to update layout
}

Run the renderings