前言:
各位同学大家好，有点时间没有给大家更新文章了具体多久。我也记不清楚了哈， 最近开发中要做一个类似微信聊天的工单系统客服中心界面（安卓版）所以想着也模仿一个鸿蒙版（基于JAVA UI的,JSUI版本的后期更新哈） 那么废话不多数说我们正式开始
准备工作
华为鸿蒙系统开发初体验 ：[https://www.jianshu.com/p/f94c847c7fdc]
效果图
image.png
具体实现
mainabiilty布局文件
<?xml version="1.0" encoding="utf-8"?>
<DependentLayout
xmlns:ohos="http://schemas.huawei.com/res/ohos"
ohos:height="match_parent"
ohos:width="match_parent"
ohos:alignment="center"
ohos:orientation="vertical">
<DependentLayout
ohos:id="$+id:company_page_dl"
ohos:height="50vp"
ohos:width="match_parent"
ohos:orientation="horizontal"
ohos:align_parent_bottom="true"
>
<Button
ohos:id="$+id:main_my_btn"
ohos:width="match_content"
ohos:height="match_content"
ohos:text="发送"
ohos:text_size="35vp"
ohos:align_parent_right="true"
ohos:background_element="$graphic:background_btn"
>
</Button>
<TextField
ohos:id="$+id:main_textfiled"
ohos:width="match_parent"
ohos:height="match_parent"
ohos:hint="请输入你的消息"
ohos:vertical_center="true"
ohos:text_size="50"
ohos:left_of="$id:main_my_btn"
ohos:layout_alignment="left"
>
</TextField>
</DependentLayout>
<ListContainer
ohos:above="$id:company_page_dl"
ohos:id="$+id:main_list"
ohos:height="match_parent"
ohos:width="match_parent"
>
</ListContainer>
</DependentLayout>
布局预览效果
image.png
我们观察布局文件 我们可以看到我们写了一个列表控件ListContainer 来装载我们发送出去的消息和接收到的消息 然后底部我们写了一个 TextField 控件来处理用户的输入 和一个button来触发发送的动作
逻辑代码
我们初始化对应控件并且listContainer 和适配器绑定到一起
private void initview() {
listContainer= (ListContainer) findComponentById(ResourceTable.Id_main_list);
textField= (TextField) findComponentById(ResourceTable.Id_main_textfiled);
mainbtn= (Button) findComponentById(ResourceTable.Id_main_my_btn);
mainbtn.setClickedListener(this);
myProvider=new MyProvider(data,getAbility());
listContainer.setItemProvider(myProvider);
myProvider.notifyDataChanged();//有新消息时，刷新ListView中的显示
}
-
初始默认假数据
我们方便展示就写了3条假数据仅供展示
private void initMsg() {
Msg msg1 = new Msg("你好",Msg.RECEIVED);
data.add(msg1);
Msg msg2 = new Msg("你好呀",Msg.SENT);
data.add(msg2);
Msg msg3 = new Msg("很高兴认识你",Msg.RECEIVED);
data.add(msg3);
}
-
用户输入逻辑
@Override
public void onClick(Component component) {
content=textField.getText().toString();
switch (component.getId()){
case ResourceTable.Id_main_my_btn:
if(!flag){
Msg msg = new Msg(content, Msg.SENT);
data.add(msg);
flag=true;
}else {
Msg msg = new Msg(content, Msg.RECEIVED);
data.add(msg);
flag=false;
}
myProvider.notifyDataChanged();//有新消息时，刷新ListView中的显示
textField.setText("");//清空输入框的内容
break;
default:
break;
}
}
我们通过一个布尔值flag来做一个开关处理用户输入的 动作轮流来处理是接收到消息还是发送出消息
-
发送消息
Msg msg = new Msg(content, Msg.SENT);
data.add(msg);
-
接收消息
Msg msg = new Msg(content, Msg.RECEIVED);
data.add(msg);
bena类
package com.example.imdemo.bean;
public class Msg{
public static final int RECEIVED = 0;//收到一条消息
public static final int SENT = 1;//发出一条消息
private String content;//消息的内容
private int type;//消息的类型
public Msg(String content,int type){
this.content = content;
this.type = type;
}
public String getContent(){
return content;
}
public int getType(){
return type;
}
}
我们分别定义了2个常量和2个变量 来处理我们的消息逻辑
适配器
-
适配器item.xml布局
<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
xmlns:ohos="http://schemas.huawei.com/res/ohos"
ohos:height="match_content"
ohos:width="match_parent"
ohos:orientation="vertical">
<DirectionalLayout
ohos:id="$+id:left_layout"
ohos:height="match_content"
ohos:width="match_content"
ohos:layout_alignment="left"
ohos:background_element="$graphic:background_blue"
ohos:left_margin="5vp"
ohos:visibility="visible"
ohos:top_margin="10vp"
>
<Text
ohos:id="$+id:left_msg"
ohos:height="match_content"
ohos:width="match_content"
ohos:text="哈哈哈测试"
ohos:text_color="#fff"
ohos:text_size="20vp"
ohos:margin="10vp"
>
</Text>
</DirectionalLayout>
<DirectionalLayout
ohos:id="$+id:right_Layout"
ohos:height="match_content"
ohos:width="match_content"
ohos:layout_alignment="right"
ohos:background_element="$graphic:background_red"
ohos:right_margin="5vp"
ohos:visibility="visible"
>
<Text
ohos:id="$+id:right_msg"
ohos:height="match_content"
ohos:width="match_content"
ohos:text="哈哈哈测试"
ohos:text_color="#fff"
ohos:text_size="20vp"
ohos:margin="10vp"
>
</Text>
</DirectionalLayout>
</DirectionalLayout>
-
item 布局预览效果
image.png
-
适配器逻辑代码
package com.example.imdemo.provider;
import com.example.imdemo.ResourceTable;
import com.example.imdemo.bean.Msg;
import ohos.aafwk.ability.Ability;
import ohos.agp.components.*;
import java.util.List;
public class MyProvider extends BaseItemProvider {
private List<Msg> list;
private Ability ability;
public MyProvider(List<Msg> list, Ability ability) {
this.list = list;
this.ability = ability;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int i) {
return list.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public Component getComponent(int i, Component component, ComponentContainer componentContainer) {
ViewHodler hodler=null;
Msg msg = list.get(i);
if (component== null) {
component = LayoutScatter.getInstance(ability).parse(ResourceTable.Layout_item,null,false);
hodler=new ViewHodler();
hodler.leftLayout = (DirectionalLayout) component.findComponentById(ResourceTable.Id_left_layout);
hodler.rightLayout = (DirectionalLayout) component.findComponentById(ResourceTable.Id_right_Layout);
hodler.leftMsg = (Text) component.findComponentById(ResourceTable.Id_left_msg);
hodler.rightMsg = (Text) component.findComponentById(ResourceTable.Id_right_msg);
component.setTag(hodler);
} else {
hodler= (ViewHodler) component.getTag();
}
System.out.println("type--- > "+msg.getType());
if(msg.getType()==Msg.RECEIVED){
System.out.println("左边消息");
//如果是收到的消息，则显示左边消息布局，将右边消息布局隐藏
hodler.leftLayout.setVisibility(0);
hodler.rightLayout.setVisibility(1);
hodler.leftMsg.setText(msg.getContent());
}else if(msg.getType()==Msg.SENT){
System.out.println("右边消息");
//如果是发出去的消息，显示右边布局的消息布局，将左边的消息布局隐藏
hodler.rightLayout.setVisibility(0);
hodler.leftLayout.setVisibility(1);
hodler.rightMsg.setText(msg.getContent());
}
return component;
}
class ViewHodler{
DirectionalLayout leftLayout;
DirectionalLayout rightLayout;
Text leftMsg;
Text rightMsg;
}
}
我们通过在 getComponent 方法中通过小标i来遍历集合然后拿到里面每一个对应里面的 type属性来判断是显示左边布局还是右边布局 也就是对应的发送消息和接收消息的UI 我们通过简单布局显示影藏来实现消息的左右2边显示效果 到此整个仿微信聊天的布局UI效果就讲完了 。
最后总结
鸿蒙的仿微信聊天UI效果 实现起来相对比较简单 其实还有一种办法那就是 ListContainer的多布局也是通过bean来里面的标识来显示左右不同的布局来实现聊天界面的效果 因为篇幅有限这里就不展开讲了有兴趣的同学可以私下研究 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
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