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
image.png
image.png
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>
image.png
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!
