自学鸿蒙应用开发（8）- DatePicker组件

<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_content"        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"        />        <TextField            ohos:id="$+id:text_field"            ohos:width="match_parent"            ohos:height="30vp"            ohos:text_size="20fp"            ohos:text_alignment="center"            ohos:hint="Please input text and press [Click me!] button."            ohos:background_element="$graphic:background_text_field"        />        <Button            ohos:id="$+id:hello_button"            ohos:width="match_content"            ohos:height="match_content"            ohos:text_size="27fp"            ohos:text="Click me!"            ohos:layout_alignment="center"            ohos:background_element="$graphic:background_button"            ohos:margin="15vp"            ohos:right_padding="8vp"            ohos:left_padding="8vp"            />        <DatePicker            ohos:id="$+id:date_pick"            ohos:height="match_content"            ohos:width="300vp"            ohos:text_size="20fp"            ohos:selected_text_size="40fp">        DatePicker>    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.Button;import ohos.agp.components.Component;import ohos.agp.components.DatePicker;import ohos.agp.components.TextField;import ohos.agp.window.dialog.ToastDialog;import java.time.LocalDate;
public class ComponentAbilitySlice extends AbilitySlice {    @Override    public void onStart(Intent intent) {        super.onStart(intent);        super.setUIContent(ResourceTable.Layout_ability_component);        //获取textfield输入组件        TextField tf = (TextField) findComponentById(ResourceTable.Id_text_field);        //获取button组件        Button button = (Button) findComponentById(ResourceTable.Id_hello_button);        //获取datepicker组件        DatePicker picker = (DatePicker) findComponentById(ResourceTable.Id_date_pick);        // 为按钮设置点击事件回调        button.setClickedListener(new Component.ClickedListener() {            public void onClick(Component v) {                LocalDate rightNow = LocalDate.now();                LocalDate pickDate = LocalDate.of(picker.getYear(), picker.getMonth(), picker.getDayOfMonth());                String msg;                if(pickDate.isBefore(rightNow))                    msg = "所选日期比今天早" + pickDate.until(LocalDate.now()).getDays() + "天";                else if(pickDate.isAfter(rightNow))                    msg = "所选日期比今天晚" + LocalDate.now().until(pickDate).getDays() + "天";                else                    msg = "所选日期和今天是同一天";
                new ToastDialog(getContext())                        .setText(msg)                        .show();            }        });        //设定事件响应        picker.setValueChangedListener(            new DatePicker.ValueChangedListener() {                @Override                public void onValueChanged(DatePicker datePicker, int year, int monthOfYear, int dayOfMonth) {                    tf.setText(year+"/"+monthOfYear+"/"+dayOfMonth);                }            }        );    }    @Override    public void onActive() {        super.onActive();    }    @Override    public void onForeground(Intent intent) {        super.onForeground(intent);    }}