HarmonyOS AI基础技术赋能之生成二维码 原创 精华

<?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">

<Image
  ohos:id="$+id:imgQrCode"
  ohos:height="500vp"
  ohos:width="500vp"
  ohos:layout_alignment="center"/>

</DirectionalLayout>
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MainAbilitySlice.java
package com.isoftstone.qrcode.slice;

import com.isoftstone.qrcode.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Text;

public class MainAbilitySlice extends AbilitySlice {

  @Override
  public void onStart(Intent intent) {
    super.onStart(intent);
    super.setUIContent(ResourceTable.Layout_ability_main);
    Text qrCode = (Text) findComponentById(ResourceTable.Id_qrCode_text);
    qrCode.setClickedListener(component -> present(new QRCodeAbilitySlice(),new Intent()));
  }

  @Override
  public void onActive() {
    super.onActive();
  }

  @Override
  public void onForeground(Intent intent) {
    super.onForeground(intent);
  }
}
QRCodeAbilitySlice.java

package com.isoftstone.qrcode.slice;

import com.isoftstone.qrcode.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Image;
import ohos.ai.cv.common.ConnectionCallback;
import ohos.ai.cv.common.VisionManager;
import ohos.ai.cv.qrcode.IBarcodeDetector;
import ohos.media.image.ImageSource;
import ohos.media.image.PixelMap;
import ohos.media.image.common.PixelFormat;

/**
 * 二维码生成
 */
public class QRCodeAbilitySlice extends AbilitySlice {

    private Image imgQrCode;
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_qrcode);
        imgQrCode=(Image)findComponentById(ResourceTable.Id_imgQrCode);
    }

    @Override
    public void onActive() {
        super.onActive();
        ConnectionCallback connectionCallback = new ConnectionCallback() {
            @Override
            public void onServiceConnect() {
                //需要生成二维码的字符串
                String barText= "www.baidu.com";
                //连接成功生成二维码
                createQRCode(barText);
            }

            @Override
            public void onServiceDisconnect() {
                // Do something when service connects unsuccessfully
            }
        };
        //初始化，建立与能力引擎的连接
        VisionManager.init(this, connectionCallback);
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }

    /**
     * 创建二维码
     * @param barText 需要生成二维码的字符串
     */
    private void createQRCode(String barText){
        //实例化接口，获取二维码侦测器
        IBarcodeDetector barcodeDetector = VisionManager.getBarcodeDetector(QRCodeAbilitySlice.this);
        //定义码生成图像的尺寸
        final int SAMPLE_LENGTH = 500;
        //根据图像的大小，分配字节流数组的空间
        byte[] byteArray = new byte[SAMPLE_LENGTH * SAMPLE_LENGTH * 4];
        //调用IBarcodeDetector的detect()方法，根据输入的字符串信息生成相应的二维码图片字节流
        barcodeDetector.detect(barText, byteArray, SAMPLE_LENGTH, SAMPLE_LENGTH);
        //释放侦测器
        barcodeDetector.release();
        //通过SourceOptions指定数据源的格式信息
        ImageSource.SourceOptions srcOpts = new ImageSource.SourceOptions();
        //定义图片格式
        srcOpts.formatHint = "image/png";
        //创建图片源
        ImageSource imgSource= ImageSource.create(byteArray,srcOpts);
        //创建图像解码选项
        ImageSource.DecodingOptions decodingOpts =new ImageSource.DecodingOptions();
        decodingOpts.desiredPixelFormat= PixelFormat.ARGB_8888;
        //通过图片源创建PixelMap
        PixelMap pMap =imgSource.createPixelmap(decodingOpts);
        //赋值到图片标签
        imgQrCode.setPixelMap(pMap);
        //释放资源
        barcodeDetector.release();
        imgSource.release();
        if(pMap!=null)
        {
            pMap.release();
        }
        //断开与能力引擎的连接
        VisionManager.destroy();
    }
}
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