【HarmonyOS 】【JAVA UI】HarmonyOS 加载网络图片

 主要作用

加载网络图片功用于界面显示

参考资料

权限开发指导

线程管理

图像开发概述

代码实现

config.json配置

config.json代码如下

    "reqPermissions": [    {"name": "ohos.permission.INTERNET"}    ],

xml代码实现

java代码实现

package com.harmony.alliance.mydemo.slice;import com.harmony.alliance.mydemo.ResourceTable;import ohos.aafwk.ability.AbilitySlice;import ohos.aafwk.content.Intent;import ohos.agp.components.Component;import ohos.agp.components.ComponentProvider;import ohos.agp.components.Image;import ohos.media.image.ImageSource;import ohos.media.image.PixelMap;import ohos.media.image.common.PixelFormat;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLConnection;public class myImageAbilitySlice  extends AbilitySlice {    private Image myImage;    @Override    protected void onStart(Intent intent) { super.onStart(intent); setUIContent(ResourceTable.Layout_my_image); myImage=findComponentById(ResourceTable.Id_myImage); findComponentById(ResourceTable.Id_LoadImage).setClickedListener(new Component.ClickedListener() {     @Override     public void onClick(Component component) {  new Thread(){      @Override      public void run() {   super.run();   LoadImageData();      }  }.start();     } });    }    public  void  LoadImageData(){ String   urlImage = "https://www.harmonyos.com/resource/image/community/20201009-164134eSpace.jpg"; HttpURLConnection connection = null; try {     URL url = new URL(urlImage);     URLConnection urlConnection =   url.openConnection();     if (urlConnection instanceof   HttpURLConnection) {  connection =   (HttpURLConnection) urlConnection;     }     if (connection != null) {  connection.connect();  // 之后可进行url的其他操作  // 得到服务器返回过来的流对象  InputStream inputStream =   urlConnection.getInputStream();  ImageSource imageSource = ImageSource.create(inputStream,   new ImageSource.SourceOptions());  ImageSource.DecodingOptions   decodingOptions = new ImageSource.DecodingOptions();  decodingOptions.desiredPixelFormat   = PixelFormat.ARGB_8888;  // 普通解码叠加旋转、缩放、裁剪  PixelMap pixelMap = imageSource.createPixelmap(decodingOptions);  // 普通解码  getUITaskDispatcher().syncDispatch(()   -> {      myImage.setPixelMap(pixelMap);      pixelMap.release();  });     } }   catch (Exception e) {     e.printStackTrace(); }    }}

运行效果

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