1.引入：

implementation 'io.openharmony.tpc.thirdlib:glide:1.0.3'
implementation 'io.openharmony.tpc.thirdlib:subsampling-scale-image-view:1.0.4'//加载长图

2.xml

 <com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
        ohos:id="$+id:longImg"
        ohos:image_src="$media:test2"
        ohos:height="match_content"
        ohos:layout_alignment="center"
        ohos:width="match_content"/>

3.java 代码

private void initView() {

        GlideUrl glideUrl = new GlideUrl(url, new LazyHeaders.Builder()
                .build());

        Glide.with(context)
                .asBitmap()
                .load(glideUrl)
                .apply(new RequestOptions()
                        .placeholder(ResourceTable.Media_boy)
                        .error(ResourceTable.Media_boy)
                        .skipMemoryCache(true) // 不使用内存缓存
                        .diskCacheStrategy(DiskCacheStrategy.NONE) // 不使用磁盘缓存
                )
                .into(new SimpleTarget<PixelMap>() {
                    public void onResourceReady(PixelMap pixelMap, Transition<? super PixelMap> transition) {
                        longImg.setPixelMap(pixelMap);
                        int phoneWidth = DisplayUtils.getDisplayWidthInPx(context);
                        int phoneHeight = DisplayUtils.getDisplayHeightInPx(context);
                        Log.d("屏幕-宽度", phoneWidth + "");
                        Log.d("屏幕-高度", phoneHeight + "");
                        int picWidth = pixelMap.getImageInfo().size.width;
                        int picHeight = pixelMap.getImageInfo().size.height;
                        Log.d("图片-宽度", picWidth + "");
                        Log.d("图片-高度", picHeight + "");
                        float scaleNum = ((float) phoneWidth / (float) picWidth);
                        Log.d("放大比率-宽度", scaleNum + "");
                        //如果 图片的高度度 大于 屏幕的宽度 就把原始图片放大到屏幕的宽度 放大的比率是 手机屏幕的宽度除以图片的宽度
                        if (picHeight >= phoneHeight) {
                            Log.d("设置最小放大比率", "小====");
                            longImg.setMinScale(scaleNum);
                        }
                    }
                });
    }