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鸿蒙 Picker日期选择器实现教程

2022-06-09 15:14:00 【华为云】

前言：

各位同学大家好，有段时间没有给大家更新文章了，具体多久呢我也记不清楚了。最近又去鸿蒙开发社区看了一看有get一些新知识点我觉得有必要给大家分享下今天就给大家分享一个Picker 配合CommonDialog 实现的日期选择器

效果图

具体实现

package com.example.picker.dialog;import com.example.picker.ResourceTable;import com.example.picker.listener.PickerdialogListener;import ohos.aafwk.ability.Ability;import ohos.agp.components.Button;import ohos.agp.components.Component;import ohos.agp.components.LayoutScatter;import ohos.agp.components.Picker;import ohos.agp.window.dialog.CommonDialog;import ohos.app.Context;/*** * 创建人： xuqing * 创建时间：2021年3月19日15:18:33 * 类说明：底部选择器弹窗 * */public class PickerDialog extends CommonDialog implements Component.ClickedListener {    private Ability context;    private PickerdialogListener  listener;    private Picker picker ;    private Button cancelbtn,affirmbtn;    private String getdata;    private  String[]getStr={"星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期天"};    Component layout;    public PickerDialog(Ability context, PickerdialogListener listener) {        super(context);        this.context=context;        this.listener=listener;    }    @Override    protected void onCreate() {        super.onCreate();        layout = LayoutScatter.getInstance(context).                parse(ResourceTable.Layout_common_dialog, null, true);      setTransparent(true);       setContentCustomComponent(layout);       initview();    }    private void initview() {         picker= (Picker)layout.findComponentById(ResourceTable.Id_test_picker);        cancelbtn= (Button) layout.findComponentById(ResourceTable.Id_cancel_btn);        affirmbtn= (Button) layout.findComponentById(ResourceTable.Id_affirm_btn);        cancelbtn.setClickedListener(this);        affirmbtn.setClickedListener(this);        picker.setDisplayedData(getStr);        picker.setValueChangedListener(new Picker.ValueChangedListener() {            @Override            public void onValueChanged(Picker picker, int i, int i1) {                System.out.println("i -- > "+i+" i1 --- > "+ i1);                System.out.println(getStr[i1]);            }        });        picker.setValueChangedListener((picker1, oldVal, newVal) -> {            // oldVal:上一次选择的值； newVal：最新选择的值            System.out.println("oldVal "+oldVal +"newVal --- > "+newVal);            System.out.println("getstr --- > "+getStr[newVal]);            getdata=getStr[newVal];        });        picker.setFormatter(i -> {            String value;            switch (i) {                case 0:                    value = "Mon";                    break;                case 1:                    value = "Tue";                    break;                case 2:                    value = "Wed";                    break;                case 3:                    value = "Thu";                    break;                case 4:                    value = "Fri";                    break;                case 5:                    value = "Sat";                    break;                case 6:                    value = "Sun";                    break;                default:                    value = "" + i;            }            return value;        });    }    @Override    public void onClick(Component component) {        switch (component.getId()){            case ResourceTable.Id_affirm_btn:                PickerDialog.this.hide();                listener.getPickerStrSuccess(getdata);                break;            case ResourceTable.Id_cancel_btn:               PickerDialog.this.hide();                listener.getPickerStrerror();                break;            default:                break;        }    }}

PickerDialog 继承sdk的 CommonDialog 并重写 oncreate 方法和自己的构造方法然后我们加载了PickerDialog 的布局文件

<?xml version="1.0" encoding="utf-8"?>    <DirectionalLayout        xmlns:ohos="http://schemas.huawei.com/res/ohos"        ohos:height="300vp"        ohos:width="match_parent"        ohos:horizontal_center="true"        ohos:vertical_center="true"        ohos:orientation="vertical"        >      <DirectionalLayout          ohos:height="50vp"          ohos:width="match_parent"          ohos:orientation="horizontal"          >          <Button          ohos:id="$+id:cancel_btn"          ohos:height="match_parent"          ohos:width="0vp"          ohos:weight="1"          ohos:text="取消"          ohos:text_size="20vp"          ohos:text_color="#FF171818"          >      </Button>          <Button              ohos:id="$+id:affirm_btn"              ohos:height="match_parent"              ohos:width="0vp"              ohos:weight="1"              ohos:text="确定"               ohos:text_size="20vp"              ohos:text_color="#FF171818"              >          </Button>      </DirectionalLayout>      <Picker        ohos:id="$+id:test_picker"        ohos:height="match_parent"        ohos:width="match_parent"        ohos:background_element="#E1FFFF"        ohos:vertical_center="true"        ohos:horizontal_center="true"        ohos:normal_text_size="16fp"        ohos:selected_text_size="16fp"/>    </DirectionalLayout>

这边我们写了2个button 和一个picker 选择器组件我们在PickerDialog 中填充我们的布局文件然后初始化我们的控件

加载布局

    @Override    protected void onCreate() {        super.onCreate();        layout = LayoutScatter.getInstance(context).                parse(ResourceTable.Layout_common_dialog, null, true);      setTransparent(true);       setContentCustomComponent(layout);       initview();    }

初始化控件

  picker= (Picker)layout.findComponentById(ResourceTable.Id_test_picker); cancelbtn= (Button) layout.findComponentById(ResourceTable.Id_cancel_btn);  affirmbtn= (Button) layout.findComponentById(ResourceTable.Id_affirm_btn); cancelbtn.setClickedListener(this);  affirmbtn.setClickedListener(this);

选择器添加数据

private  String[]getStr={"星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期天"}; picker.setDisplayedData(getStr);

响应选择器变化

    picker.setValueChangedListener((picker1, oldVal, newVal) -> {            // oldVal:上一次选择的值； newVal：最新选择的值            System.out.println("oldVal "+oldVal +"newVal --- > "+newVal);            System.out.println("getstr --- > "+getStr[newVal]);            getdata=getStr[newVal];        });

格式化Picker的显示通过Picker的setFormatter(Formatter formatter)方法，用户可以将Picker选项中显示的字符串修改为特定的格式。

  picker.setFormatter(i -> {            String value;            switch (i) {                case 0:                    value = "Mon";                    break;                case 1:                    value = "Tue";                    break;                case 2:                    value = "Wed";                    break;                case 3:                    value = "Thu";                    break;                case 4:                    value = "Fri";                    break;                case 5:                    value = "Sat";                    break;                case 6:                    value = "Sun";                    break;                default:                    value = "" + i;            }            return value;        });

在MainAbility 中显示

package com.example.picker;import com.example.picker.dialog.PickerDialog;import com.example.picker.listener.PickerdialogListener;import com.example.picker.slice.MainAbilitySlice;import ohos.aafwk.ability.Ability;import ohos.aafwk.content.Intent;import ohos.agp.components.Button;import ohos.agp.components.Component;import ohos.agp.components.TableLayout;import ohos.agp.components.Text;import static ohos.agp.utils.LayoutAlignment.BOTTOM;public class MainAbility extends Ability {    private Button button;    private Text text;    @Override    public void onStart(Intent intent) {        super.onStart(intent);        super.setUIContent(ResourceTable.Layout_ability_main);        initview();    }    private void initview() {        button= (Button) findComponentById(ResourceTable.Id_mainbtn);        text= (Text) findComponentById(ResourceTable.Id_miantext);        if(button!=null){            button.setClickedListener(new Component.ClickedListener() {                @Override                public void onClick(Component component) {                    PickerDialog dialog=new PickerDialog(MainAbility.this, new PickerdialogListener() {                        @Override                        public void getPickerStrSuccess(String str) {                            text.setText(str);                        }                        @Override                        public void getPickerStrerror() {                        }                    });                    dialog.setAlignment(BOTTOM);                    dialog.show();                }            });        }    }}

MainAbility 布局文件

<?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">    <Button        ohos:id="$+id:mainbtn"        ohos:height="match_content"        ohos:width="match_content"        ohos:layout_alignment="center"        ohos:text="点击打开弹窗"        ohos:text_size="15fp"        ohos:top_margin="20vp"        ohos:background_element="$graphic:background_ability_main"        >    </Button>    <Text        ohos:id="$+id:miantext"        ohos:height="match_content"        ohos:width="match_content"        ohos:layout_alignment="center"        ohos:top_margin="20vp"        ohos:text="哈哈哈"        ohos:text_size="15fp"        >    </Text></DirectionalLayout>

到此鸿蒙 Picker日期选择器实现教程就讲完了。

最后总结

鸿蒙里面提供了picker选择器控件给我们用所以我们配合sdk提供的 CommonDialog 弹窗控件就很容易实现比较简单的底部的日期选择器。整个功能实现比较接近原生安卓但是又比安卓更进一步所以实现起来不难有兴趣的同学还可以尝试实现更为复杂多样的选择这边就不展开讲了。最后希望我的文章能帮助到各位解决问题，以后我还会贡献更多有用的代码分享给大家。各位同学如果觉得文章还不错，麻烦给关注和star，小弟在这里谢过啦!