自学鸿蒙应用开发（13）- ProgressBar

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:orientation="vertical">
    <Component
        ohos:height="0vp"
        ohos:weight="3"
        ohos:width="match_parent"
        />
    <DirectionalLayout
        xmlns:ohos="http://schemas.huawei.com/res/ohos"
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:layout_alignment="center"
        ohos:orientation="vertical">
        <Image
            ohos:id="$+id:image"
            ohos:width="match_content"
            ohos:height="match_content"
            ohos:layout_alignment="center"
            ohos:image_src="$media:DevEco"
        />
        <TimePicker
            ohos:id="$+id:time_picker"
            ohos:24_hour_mode="false"
            ohos:height="match_content"
            ohos:width="match_parent"
            ohos:layout_alignment="horizontal_center"
            ohos:text_am="AM"
            ohos:text_pm="PM"
            ohos:normal_text_size="20fp"
            ohos:selected_text_size="25fp"/>
        <ProgressBar
            ohos:id="$+id:second_progress"
            ohos:progress_width="10vp"
            ohos:height="60vp"
            ohos:width="match_parent"
            ohos:max="100"
            ohos:min="0"
            ohos:progress="60"/>
    </DirectionalLayout>
    <Component
        ohos:height="0vp"
        ohos:weight="5"
        ohos:width="match_parent"
        />
</DirectionalLayout>

package com.example.helloharmony.slice;
import com.example.helloharmony.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.*;
import ohos.agp.window.dialog.ToastDialog;
import java.time.LocalTime;
import java.time.temporal.ChronoUnit;

public class ComponentAbilitySlice extends AbilitySlice {
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_component);
        //获取TimePicker组件
        TimePicker picker = (TimePicker) findComponentById(ResourceTable.Id_time_picker);
        //获取ProgressBar组件
        ProgressBar secondsBar = (ProgressBar)findComponentById(ResourceTable.Id_second_progress);
        updateProgressValue(picker, secondsBar);
        //为TimePicker设定事件响应
        ComponentAbilitySlice this_slice = this;
        picker.setTimeChangedListener(
            new TimePicker.TimeChangedListener() {
                @Override
                public void onTimeChanged(TimePicker timePicker, int hour, int minute, int second) {
                    this_slice.updateProgressValue(timePicker, secondsBar);
                }
            }
        );
    }
    @Override
    public void onActive() {
        super.onActive();
    }
    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }

    private void updateProgressValue(TimePicker time_picker, ProgressBar progress){
        int seconds = (time_picker.getHour() * 60 + time_picker.getMinute()) * 60 + time_picker.getSecond();
        progress.setProgressValue(progress.getMin() + seconds * (progress.getMax() - progress.getMin()) / 86400);
    }
}