图像加载并优化云式和Fresco

写由亚基尔佩林 11点15分2017分 4min读取

身为移动开发商,当谈论图像和视频时,我们关注的主要问题之一是为用户创造平滑和惊人的经验,不管用户使用何种设备或网络连接文章中,我要向大家展示你如何轻而易举地提高经验使用云化并Fresco.

Android使用图像(bitmaps)实为困难,因为应用经常耗尽存储器OOM是Android开发者最大的恶梦

莱斯利Knope

有一些知名开源库可以帮助我们处理Picasa、Glide和Fresco等问题

Fresco(脸书版)是我最喜欢的Fresco写C/C++使用shmem堆取代VM堆中间字节缓冲区还存储在原生堆留下更多内存供应用使用并减少OOMs风险并减少垃圾回收量,另一酷点是Fresco支持多图像(多URI),请求不同的图像属性定位,这有助于我们进一步提高用户连通性差等经验

多图像请求

假设你想向用户显示高分辨率相对慢下加载图像与其让他们盯着占位符或加载旋转器一阵子,不如先快速下载小缩略图Fresco设置两张图像URIs,一张低分辨率图像,一张高分辨率图像

        Uri LowResUri高端ResUrisetLowResimage请求Uri(lowResUri).setimage请求Uri(highResUri).setOldCensemSimpleDraweeView.setController(controller);

可如何生成二图像质量URIs

云化取回功能允许远程图像即时转换并优化通过超快CDN交付允许我们轻而易举地生成不同图像质量版本,而不论图像位置

假设这是我原创图像存储在我的AWSS3桶

甜甜圈 https://s3.amazonaws.com/myappmedia/donut.png

可见图像大小近1MB多图像加载有时会损害用户经验,同时等待图像全加载

云化超易取出图像并生成低高频图像版本

获取带云远程图像

基本URL模板使用云性获取远程图像

https://res.www.agrosoland.com/
         
          /image/fetch/
          
           /

增加动态低分辨率转换

URL添加参数调整质量时长像

https://res.www.agrosoland.com/demo/image/fetch/f_webp,q_auto:low,w_400/https://s3.amazonaws.com/myappmedia/donut.png

变换图像甜甜圈WebP向下标为400像素宽度,并设置自定义质量:low规模权衡比较低质量被视为可接受性)。变换图像大小从近兆字节减到2.37KB

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\"fetch\"})","codeSnippet":"$.cloudinary.image(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\", {quality: \"auto:low\", width: 400, fetch_format: \"auto\", crop: \"scale\", type: \"fetch\"})","status":0,"statusText":"Ok","displayName":"jQuery","packageName":"cloudinary-jquery","packageStatus":"","packageVersion":"2.x"},{"sdkId":"react_native","framework":"react_native","language":"react_native","rawCodeSnippet":"new CloudinaryImage(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\")\n .resize(scale().width(400))\n .delivery(format(auto()))\n .delivery(quality(autoLow()))\n .setDeliveryType(\"fetch\");","codeSnippet":"new CloudinaryImage(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\")\n .resize(scale().width(400))\n .delivery(format(auto()))\n .delivery(quality(autoLow()))\n .setDeliveryType(\"fetch\");","status":0,"statusText":"Ok","displayName":"React Native","packageName":"cloudinary-react-native","packageStatus":"","packageVersion":"0.x"}]" parsed-url="{"url":"https:\/\/res.www.agrosoland.com\/demo\/image\/fetch\/f_auto,q_auto:low,w_400\/https:\/\/s3.amazonaws.com\/myappmedia\/donut.png","cloud_name":"demo","host":"res.www.agrosoland.com","type":"fetch","resource_type":"image","transformation":[{"format":"auto","quality":"auto:low","width":"400"}],"transformation_string":"f_auto,q_auto:low,w_400","url_suffix":"","version":"","secure":true,"public_id":"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png","extension":"png","format":"auto","format_code":true,"signature":"","private_cdn":false,"result_asset_type":"image"}" with-url="true" > 加载代码示例

注意为WebP工作,你唯一需要做的就是添加webp支持库到您的依存性,像描述来.

添加动态转换高解析

需要注意的是,你还可以动态优化高品质1MB图像,以使它更理想 Android设备屏幕尺寸高分辨率版可修改质量参数为Auto:best并保留宽度与低分辨率相同变换产生6.88KB小尺寸图像

https://res.www.agrosoland.com/demo/image/fetch/f_webp,q_auto:best,w_400/https://s3.amazonaws.com/myappmedia/donut.png

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Transformation().Quality(\"auto:best\").Width(400).FetchFormat(\"webp\").Crop(\"scale\")).Action(\"fetch\").BuildImageTag(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\")","codeSnippet":"cloudinary.Api.UrlImgUp.Transform(new Transformation().Quality(\"auto:best\").Width(400).FetchFormat(\"webp\").Crop(\"scale\")).Action(\"fetch\").BuildImageTag(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\")","status":0,"statusText":"Ok","displayName":".NET","packageName":"CloudinaryDotNet","packageStatus":"","packageVersion":"1.x"},{"sdkId":"dart","framework":"dart","language":"dart","rawCodeSnippet":"cloudinary.image('https:\/\/s3.amazonaws.com\/myappmedia\/donut.png').transformation(Transformation()\n\t.resize(Resize.scale().width(400))\n\t.delivery(Delivery.format(\n\tFormat.webp()))\n\t.delivery(Delivery.quality(\n\tQuality.autoBest()))\n\t.setDeliveryType(\"fetch\"));","codeSnippet":"cloudinary.image('https:\/\/s3.amazonaws.com\/myappmedia\/donut.png').transformation(Transformation()\n\t.resize(Resize.scale().width(400))\n\t.delivery(Delivery.format(\n\tFormat.webp()))\n\t.delivery(Delivery.quality(\n\tQuality.autoBest()))\n\t.setDeliveryType(\"fetch\"));","status":0,"statusText":"Ok","displayName":"Dart","packageName":"cloudinary_dart","packageStatus":"","packageVersion":"0.x"},{"sdkId":"swift","framework":"swift","language":"swift","rawCodeSnippet":"imageView.cldSetImage(cloudinary.createUrl().setType( \"fetch\").setTransformation(CLDTransformation().setQuality(\"auto:best\").setWidth(400).setFetchFormat(\"webp\").setCrop(\"scale\")).generate(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\")!, cloudinary: cloudinary)","codeSnippet":"imageView.cldSetImage(cloudinary.createUrl().setType( \"fetch\").setTransformation(CLDTransformation().setQuality(\"auto:best\").setWidth(400).setFetchFormat(\"webp\").setCrop(\"scale\")).generate(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\")!, cloudinary: cloudinary)","status":0,"statusText":"Ok","displayName":"iOS","packageName":"cloudinary","packageStatus":"","packageVersion":"3.x"},{"sdkId":"android","framework":"android","language":"android","rawCodeSnippet":"MediaManager.get().url().transformation(new Transformation().quality(\"auto:best\").width(400).fetchFormat(\"webp\").crop(\"scale\")).type(\"fetch\").generate(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\");","codeSnippet":"MediaManager.get().url().transformation(new Transformation().quality(\"auto:best\").width(400).fetchFormat(\"webp\").crop(\"scale\")).type(\"fetch\").generate(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\");","status":0,"statusText":"Ok","displayName":"Android","packageName":"cloudinary-android","packageStatus":"","packageVersion":"1.x"},{"sdkId":"flutter","framework":"flutter","language":"flutter","rawCodeSnippet":"cloudinary.image('https:\/\/s3.amazonaws.com\/myappmedia\/donut.png').transformation(Transformation()\n\t.resize(Resize.scale().width(400))\n\t.delivery(Delivery.format(\n\tFormat.webp()))\n\t.delivery(Delivery.quality(\n\tQuality.autoBest()))\n\t.setDeliveryType(\"fetch\"));","codeSnippet":"cloudinary.image('https:\/\/s3.amazonaws.com\/myappmedia\/donut.png').transformation(Transformation()\n\t.resize(Resize.scale().width(400))\n\t.delivery(Delivery.format(\n\tFormat.webp()))\n\t.delivery(Delivery.quality(\n\tQuality.autoBest()))\n\t.setDeliveryType(\"fetch\"));","status":0,"statusText":"Ok","displayName":"Flutter","packageName":"cloudinary_flutter","packageStatus":"","packageVersion":"0.x"},{"sdkId":"kotlin","framework":"kotlin","language":"kotlin","rawCodeSnippet":"cloudinary.image {\n\tpublicId(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\")\n\t resize(Resize.scale() { width(400) })\n\t delivery(Delivery.format(\n\tFormat.webp()))\n\t delivery(Delivery.quality(\n\tQuality.autoBest()))\n\t deliveryType(\"fetch\") \n}.generate()","codeSnippet":"cloudinary.image {\n\tpublicId(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\")\n\t resize(Resize.scale() { width(400) })\n\t delivery(Delivery.format(\n\tFormat.webp()))\n\t delivery(Delivery.quality(\n\tQuality.autoBest()))\n\t deliveryType(\"fetch\") \n}.generate()","status":0,"statusText":"Ok","displayName":"Kotlin","packageName":"kotlin-url-gen","packageStatus":"","packageVersion":"1.x"},{"sdkId":"jquery","framework":"jquery","language":"jquery","rawCodeSnippet":"$.cloudinary.image(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\", {quality: \"auto:best\", width: 400, fetch_format: \"webp\", crop: \"scale\", type: \"fetch\"})","codeSnippet":"$.cloudinary.image(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\", {quality: \"auto:best\", width: 400, fetch_format: \"webp\", crop: \"scale\", type: \"fetch\"})","status":0,"statusText":"Ok","displayName":"jQuery","packageName":"cloudinary-jquery","packageStatus":"","packageVersion":"2.x"},{"sdkId":"react_native","framework":"react_native","language":"react_native","rawCodeSnippet":"new CloudinaryImage(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\")\n .resize(scale().width(400))\n .delivery(format(webp()))\n .delivery(quality(autoBest()))\n .setDeliveryType(\"fetch\");","codeSnippet":"new CloudinaryImage(\"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png\")\n .resize(scale().width(400))\n .delivery(format(webp()))\n .delivery(quality(autoBest()))\n .setDeliveryType(\"fetch\");","status":0,"statusText":"Ok","displayName":"React Native","packageName":"cloudinary-react-native","packageStatus":"","packageVersion":"0.x"}]" parsed-url="{"url":"https:\/\/res.www.agrosoland.com\/demo\/image\/fetch\/f_webp,q_auto:best,w_400\/https:\/\/s3.amazonaws.com\/myappmedia\/donut.png","cloud_name":"demo","host":"res.www.agrosoland.com","type":"fetch","resource_type":"image","transformation":[{"format":"webp","quality":"auto:best","width":"400"}],"transformation_string":"f_webp,q_auto:best,w_400","url_suffix":"","version":"","secure":true,"public_id":"https:\/\/s3.amazonaws.com\/myappmedia\/donut.png","extension":"png","format":"webp","format_code":true,"signature":"","private_cdn":false,"result_asset_type":"image"}" with-url="true" > 加载代码示例

使用Fresco完成示例时,只需为低高版本设置URLs

字符串原创imageURL="https://s3.amazonaws.com/myappmedia/donut.png";字符串低ResUri="https://res.www.agrosoland.com/demo/image/fetch/f_webp,q_auto:low,w_400/e_blur:90/"+原创imageURL字符串高ResUri="https://res.www.agrosoland.com/demo/image/fetch/f_webp,q_auto:best,w_400/"+原创imageURLDraweeController controller = Fresco.newDraweeControllerBuilder() .setLowResImageRequest(ImageRequest.fromUri(Uri.parse(low_res_url))) .setImageRequest(ImageRequest.fromUri(Uri.parse(high_res_url))) .setOldController(mSimpleDraweeView.getController()).build()!mSimpleDraweeView.setController(controller);代码语言JavaScript高山市javascript)

很容易吧

图像视频是移动应用核心组件使用云形和Fresco可大幅提高 Android用户经验,

自由评论下方您对此文章或其他媒体优化相关问题有任何问题下一站我们将讨论如何优化 Android应用视频

图像加载并优化云式和Fresco

多图像请求

可如何生成二图像质量URIs

获取带云远程图像

增加动态低分辨率转换

添加动态转换高解析

很容易吧

继续阅读图像优化

币游国际真人娱乐Livering云化与Flask:创建交互式图像平台

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