HarmonyOS AI基础技术赋能之关键字获取 原创 精华

引言 

      在实际应用开发中，时不时的会遇到AI领域相关的一些技术，本节旨在详细讲述关键字获取技术，关键字获取涉及各个领域中，如：游记摘要、新闻标签、杂志文刊等。所以对于HarmonyOS开发者而言，了解和掌握HarmonyOS AI领域相关技术是至关重要的，也是每一个HarmonyOS开发者的一项必不可少的专业技能。

功能介绍

      关键字提取主要用于从新闻和邮件里提取出关键字，便于用户快速获取新闻和邮件的主题。关键字可以为有意义的实体，比如，人名、电影，也可以为非实体的关键词汇，如，上课、考研。

开发指南

1、使用NluClient静态类进行初始化，通过异步方式获取服务的连接 

  NluClient.getInstance().init(context, new OnResultListener<Integer>(){
        @Override
        public void onResult(Integer result){
         // 初始化成功回调，在服务初始化成功调用该函数
        }
    }, true);

2、调用获取关键词提取方法得到分析结果，同一个接口提供了同步和异步两个方法

同步：

String requestData= "{number:2,body:'今天我们一起去上课吧',title:'一起去上课'}";
ResponseResult respResult = NluClient.getInstance().getKeywords(requestData, NluRequestType.REQUEST_TYPE_LOCAL);
if (null != respResult){
     // 获取接口返回结果，参考接口文档返回使用
     String result = respResult.getResponseResult();
}

异步：

// 待分析文本
String requestData= "{number:2,body:'今天我们一起去上课吧',title:'一起去上课'}";
// 调用接口
NluClient.getInstance().getKeywords(requestData, NluRequestType.REQUEST_TYPE_LOCAL,new OnResultListener<ResponseResult>(){
    @Override
    public void onResult(ResponseResult respResult)
    {
    // 异步返回
    if(null != respResult && NluError.SUCCESS_RESULT == respResult.getCode())
        {
        // 获取接口返回结果，参考接口文档返回使用
        String result = respResult.getResponseResult();
        }
    }
});

3、使用结束调用destroy()方法释放进程资源

  NluClient.getInstance().destroy(this);

示例代码

1、xml布局

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
  xmlns:ohos="http://schemas.huawei.com/res/ohos"
  ohos:height="match_parent"
  ohos:orientation="vertical"
  ohos:width="match_parent">
  <Text
    ohos:background_element="$graphic:background_ability_main"
    ohos:height="match_content"
    ohos:layout_alignment="horizontal_center"
    ohos:multiple_lines="true"
    ohos:text="$string:title"
    ohos:top_margin="50vp"
    ohos:text_size="50"
    ohos:width="match_content"
    />
  <Text
    ohos:background_element="$graphic:background_ability_main"
    ohos:height="match_content"
    ohos:layout_alignment="horizontal_center"
    ohos:multiple_lines="true"
    ohos:left_margin="10vp"
    ohos:right_margin="10vp"
    ohos:text="body:'同步-今天我们一起去上课吧',title:'同步-一起去上课'-body:'异步-今天我们一起去上班吧',title:'异步-我们去上班'"
    ohos:top_margin="50vp"
    ohos:text_size="50"
    ohos:width="match_content"
    />
  <Text
    ohos:background_element="$graphic:background_ability_main"
    ohos:height="match_content"
    ohos:id="$+id:text_content"
    ohos:layout_alignment="horizontal_center"
    ohos:multiple_lines="true"
    ohos:top_margin="50vp"
    ohos:left_margin="10vp"
    ohos:right_margin="10vp"
    ohos:text_size="50"
    ohos:width="match_content"
    />
  <Text
    ohos:background_element="$graphic:background_ability_main"
    ohos:height="match_content"
    ohos:id="$+id:text_asynchronous"
    ohos:layout_alignment="horizontal_center"
    ohos:text="$string:asynchronous"
    ohos:top_margin="50vp"
    ohos:text_size="50"
    ohos:width="match_content"
    />
  <Text
    ohos:background_element="$graphic:background_ability_main"
    ohos:height="match_content"
    ohos:id="$+id:text_synchronization"
    ohos:layout_alignment="horizontal_center"
    ohos:text="$string:synchronization"
    ohos:top_margin="50vp"
    ohos:text_size="50"
    ohos:width="match_content"
    />
</DirectionalLayout>

2、案例代码

package com.example.keywords.slice;

import com.example.keywords.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Component;
import ohos.agp.components.Component.ClickedListener;
import ohos.agp.components.Text;
import ohos.ai.nlu.NluClient;
import ohos.ai.nlu.NluRequestType;
import ohos.ai.nlu.ResponseResult;
import ohos.ai.nlu.util.NluError;

public class MainAbilitySlice extends AbilitySlice implements ClickedListener {

  private Text text_content;

  @Override
  public void onStart(Intent intent) {
    super.onStart(intent);
    super.setUIContent(ResourceTable.Layout_ability_main);
    text_content = (Text) findComponentById(ResourceTable.Id_text_content);
    Text text_synchronization = (Text) findComponentById(ResourceTable.Id_text_synchronization);
    Text text_asynchronous = (Text) findComponentById(ResourceTable.Id_text_asynchronous);
    text_synchronization.setClickedListener(this);
    text_asynchronous.setClickedListener(this);
    // 使用NluClient静态类初始化，通过异步方式获取服务连接
    NluClient.getInstance().init(this, null, true);
  }

  @Override
  public void onClick(Component component) {
    switch (component.getId()) {
      case ResourceTable.Id_text_synchronization:
        String requestData = "{number:3,body:'同步-今天我们一起去上课吧',title:'同步-一起去上课'}";
        ResponseResult responseResult = NluClient.getInstance()
            .getKeywords(requestData, NluRequestType.REQUEST_TYPE_LOCAL);
        if (responseResult != null) {
          text_content.setText(responseResult.getResponseResult());
        }
        break;
      case ResourceTable.Id_text_asynchronous:
        String rData = "{number:3,body:'异步-今天我们一起去上班吧',title:'异步-我们去上班'}";
        NluClient.getInstance().getKeywords(rData, NluRequestType.REQUEST_TYPE_LOCAL,
                responseResult1 -> {
                  if (responseResult1 != null && NluError.SUCCESS_RESULT == responseResult1.getCode()) {
                    getAbility().getUITaskDispatcher().syncDispatch(() -> text_content.setText(responseResult1.getResponseResult()));
                  }
                });
        break;
      default:
        break;
    }
  }

  @Override
  protected void onBackground() {
    super.onBackground();
    NluClient.getInstance().destroy(this);
  }
}

实现效果

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