//（1）
static lv_anim_t   anim_template;
static lv_anim_t * running_anim;

lv_anim_init(&anim_template);

//（2）必须的设置

/* Set the "animator" function */
lv_anim_set_exec_cb(&anim_template, (lv_anim_exec_xcb_t) lv_obj_set_x);

/* Set target of the Animation */
lv_anim_set_var(&anim_template, widget);

/* Length of the Animation [ms] */
lv_anim_set_duration(&anim_template, duration_in_ms);

/* Set start and end values. E.g. 0, 150 */
lv_anim_set_values(&anim_template, start, end);


//（3）可选的设置

/* Time to wait before starting the Animation [ms] */
lv_anim_set_delay(&anim_template, delay);

/* Set path (curve). Default is linear */
lv_anim_set_path_cb(&anim_template, lv_anim_path_ease_in);

/* Set anim_template callback to indicate when the Animation is completed. */
lv_anim_set_completed_cb(&anim_template, completed_cb);

/* Set anim_template callback to indicate when the Animation is deleted (idle). */
lv_anim_set_deleted_cb(&anim_template, deleted_cb);

/* Set anim_template callback to indicate when the Animation is started (after delay). */
lv_anim_set_start_cb(&anim_template, start_cb);

/* When ready, play the Animation backward with this duration. Default is 0 (disabled) [ms] */
lv_anim_set_reverse_duration(&anim_template, time);

/* Delay before reverse play. Default is 0 (disabled) [ms] */
lv_anim_set_reverse_delay(&anim_template, delay);

/* Number of repetitions. Default is 1. LV_ANIM_REPEAT_INFINITE for infinite repetition */
lv_anim_set_repeat_count(&anim_template, cnt);

/* Delay before repeat. Default is 0 (disabled) [ms] */
lv_anim_set_repeat_delay(&anim_template, delay);

/* true (default): apply the start value immediately, false: apply start value after delay when the Anim. really starts. */
lv_anim_set_early_apply(&anim_template, true/false);


//（4）开启动画