先看下實(shí)現(xiàn)的效果如下:

ListContainer 是用來實(shí)現(xiàn)列表的

學(xué)習(xí)ListContainer 這個(gè)屬性看實(shí)現(xiàn)的源碼是少不了的,

在里面看到setItemProvider 應(yīng)該是用來記載item的

它里面是 BaseItemProvider 在跳進(jìn)去看看

這個(gè)里面有獲取item ,以及布局,刷新等,(不過我看的第一次看到getCount,getItem,getItemId,還以為是andriod的viewpage呢,開個(gè)玩笑,這里大致能想到,繼承這個(gè)抽象類的時(shí)候,會(huì)生成四個(gè)方法,getComponent 是加載list的item布局的,getItem是用來獲取item內(nèi)容的,)

看到這,我們要想使用setItemProvider 就要?jiǎng)?chuàng)建一個(gè)類來繼承這個(gè)抽象的BaseItemProvider

明白了大致的思路下面開始,

首先在主界面的xml中寫一個(gè)ListContainer? 具體如下:

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayoutxmlns:ohos="http://schemas.huawei.com/res/ohos"ohos:height="match_parent"ohos:width="match_parent"ohos:orientation="vertical"><ListContainerohos:id="$+id:list"ohos:height="match_parent"ohos:width="match_parent"/></DirectionalLayout>

我這里創(chuàng)建了一個(gè) BaseProvider 來繼承?BaseItemProvider

生成之后就是往里面添加內(nèi)容了,具體的如下,

package com.example.myapplication.slice;import com.example.myapplication.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.agp.components.BaseItemProvider;
import ohos.agp.components.Component;
import ohos.agp.components.ComponentContainer;
import ohos.agp.components.LayoutScatter;import java.util.List;public class BaseProvider extends BaseItemProvider {// 定義一個(gè)listprivate List<String> list;// 定義一個(gè)上下文private AbilitySlice content;public BaseProvider(List<String> list,AbilitySlice content) {super();this.list = list;this.content = content;}@Overridepublic int getCount() {return list == null ? 0 : list.size();}@Overridepublic Object getItem(int i) {return list.get(i);}@Overridepublic long getItemId(int i) {return i;}@Overridepublic Component getComponent(int i, Component component, ComponentContainer componentContainer) {component = LayoutScatter.getInstance(content).parse(ResourceTable.Layout_item_sample, null, false);return component;}
}

這里插入的一個(gè)item的如下

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayoutxmlns:ohos="http://schemas.huawei.com/res/ohos"ohos:height="match_content"ohos:width="match_parent"ohos:orientation="vertical"><Textohos:id="$+id:item"ohos:height="60fp"ohos:width="match_content"ohos:text="HarmonyOS"ohos:layout_alignment="center"ohos:text_size="20fp"/><Textohos:height="1fp"ohos:width="match_parent"ohos:background_element="#00d8a0"/>
</DirectionalLayout>

?寫好之后就去java里面去試試

下面先寫100個(gè)數(shù)據(jù)看看

package com.example.myapplication.slice;import com.example.myapplication.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Component;
import ohos.agp.components.ListContainer;
import ohos.agp.window.dialog.ToastDialog;import java.util.ArrayList;
import java.util.List;public class MainAbilitySlice extends AbilitySlice {private ListContainer listContainer;@Overridepublic void onStart(Intent intent) {super.onStart(intent);super.setUIContent(ResourceTable.Layout_main_layout);listContainer = (ListContainer) findComponentById(ResourceTable.Id_list);List<String> list = new ArrayList<>();for (int i = 0; i < 100; i++) {list.add("");}BaseProvider baseProvider = new BaseProvider(list, this);listContainer.setItemProvider(baseProvider);listContainer.setItemClickedListener(new ListContainer.ItemClickedListener() {@Overridepublic void onItemClicked(ListContainer listContainer, Component component, int i, long l) {new ToastDialog(getContext()).setText("點(diǎn)擊了第" + i  + "個(gè)").show();}});}@Overridepublic void onActive() {super.onActive();}@Overridepublic void onForeground(Intent intent) {super.onForeground(intent);}
}

今天寫實(shí)現(xiàn)一個(gè)簡單的list ,list里面的要學(xué)習(xí)的內(nèi)容挺多的,后續(xù)在更新一些,添加item 和刪除item

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