blocks|key|657074|text|在属性中使用Image.network构建|type|unstyled|depth|inlineStyleRanges|entityRanges|data|657075|++++Image.network(
++++++"https://www.kindpng.com/imgv/ioJmwwJ_dummy-profile-image-jpg-hd-png-download/",
++++++loadingBuilder:+(BuildContext+context,+Widget+child,+ImageChunkEvent+loadingProgress)+{
++++++++if+(loadingProgress+==+null)+return+child;
++++++++++return+Center(
++++++++++++child:+CircularProgressIndicator(
++++++++++++++value:+loadingProgress.expectedTotalBytes+!=+null
++++++++++++++++?+loadingProgress.cumulativeBytesLoaded+/+loadingProgress.expectedTotalBytes
++++++++++++++++:+null,
+++++++++++),
+++++++++);
+++++++},
+++++),|code-block|syntax|javascript|657076|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Use Image.network build in property
<pre><code> Image.network(
 &quot;https://www.kindpng.com/imgv/ioJmwwJ_dummy-profile-image-jpg-hd-png-download/&quot;,
 loadingBuilder: (BuildContext context, Widget child, ImageChunkEvent loadingProgress) {
 if (loadingProgress == null) return child;
 return Center(
 child: CircularProgressIndicator(
 value: loadingProgress.expectedTotalBytes != null
 ? loadingProgress.cumulativeBytesLoaded / loadingProgress.expectedTotalBytes
 : null,
 ),
 );
 },
 ),
</code></pre>

blocks|key|539017|text|尝试使用FadeInImage()，它具有placeHolder和errorPlaceHolder的属性|type|unstyled|depth|inlineStyleRanges|entityRanges|data|539018|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Try using FadeInImage(), it has properties of placeHolder and errorPlaceHolder

blocks|key|656993|text|您可以使用图像包。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|656994|CachedNetworkImage(
++++++++placeholder:+(context,+url)+=>+Container(color+:+Colors.red),+//+Add+whatever+you+want+to+display.
++++++++imageUrl:+url,
++++++)|code-block|syntax|javascript|656995|entityMap|0|LINK|mutability|MUTABLE|url|https://pub.dev/packages/cached_network_image^0|5|2|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You can use <a href="https://pub.dev/packages/cached_network_image" rel="nofollow noreferrer">cached_network_image</a> package.
<pre><code>CachedNetworkImage(
 placeholder: (context, url) =&gt; Container(color : Colors.red), // Add whatever you want to display.
 imageUrl: url,
 )
</code></pre>

blocks|key|657051|text|class+CachedImage+extends+StatelessWidget+{
final+String+image;
final+double+radius;
final+double+imageWidth;
final+double+imageHeight;
final+double+imageArea;
final+BoxFit+fit;
final+Color+color;
final+String+placeHolder;
final+double+width;
CachedImage({
this.color+=+colorPrimary,
this.image+=+'',
this.radius+=+30,
this.imageHeight+=+70,
this.imageWidth+=+70,
this.imageArea+=+30,
this.fit+=+BoxFit.cover,
this.placeHolder+=+IMG_PLACEHOLDER,
this.width+=+1.0,
});

@override
Widget+build(BuildContext+context)+{
return+Container(
++width:+imageWidth,
++height:+imageHeight,
++decoration:+BoxDecoration(
++++border:+Border.all(
++++++color:+color,
++++++width:+width,
++++),
++++borderRadius:+BorderRadius.circular(radius),
++),
++child:+ClipRRect(
++++borderRadius:+BorderRadius.circular(radius),
++++child:+CachedNetworkImage(
++++++++placeholder:+(context,+url)+=>+Container(
++++++++++++++child:+Center(
++++++++++++++++child:+CircularProgressIndicator(
++++++++++++++++++valueColor:+new+AlwaysStoppedAnimation<Color>+
+++++++++(colorWhite),
++++++++++++++++),
++++++++++++++),
++++++++++++++height:+imageArea,
++++++++++++++decoration:+BoxDecoration(
++++++++++++++++++borderRadius:+BorderRadius.all(Radius.circular(10.0))),
++++++++++++),
++++++++errorWidget:+(context,+url,+error)+=>+Material(
++++++++++++++child:+Image.asset(
++++++++++++++++placeHolder,
++++++++++++++++width:+imageWidth,
++++++++++++++++height:+imageHeight,
++++++++++++++++fit:+BoxFit.fill,
++++++++++++++),
++++++++++++++borderRadius:+BorderRadius.all(Radius.circular(20.0)),
++++++++++++++clipBehavior:+Clip.hardEdge,
++++++++++++),
++++++++imageUrl:+image,
++++++++width:+imageWidth,
++++++++height:+imageHeight,
++++++++fit:+fit),
+++),
++);
+}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|657052|您可以使用使用CachedNetworkImage包创建的自定义小部件。在这种情况下，如果映像不是从网络加载的，我们使用的是CircularProgressBarIndicator，而如果出现错误，则没有加载网络映像，我们可以使用error小部件并从资产传递另一个映像。|unstyled|offset|length|style|BOLD|657053|entityMap^0|0|7|I|1Q|S|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]|$G|Q|H|R|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|S|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>class CachedImage extends StatelessWidget {
final String image;
final double radius;
final double imageWidth;
final double imageHeight;
final double imageArea;
final BoxFit fit;
final Color color;
final String placeHolder;
final double width;
CachedImage({
this.color = colorPrimary,
this.image = '',
this.radius = 30,
this.imageHeight = 70,
this.imageWidth = 70,
this.imageArea = 30,
this.fit = BoxFit.cover,
this.placeHolder = IMG_PLACEHOLDER,
this.width = 1.0,
});

@override
Widget build(BuildContext context) {
return Container(
 width: imageWidth,
 height: imageHeight,
 decoration: BoxDecoration(
 border: Border.all(
 color: color,
 width: width,
 ),
 borderRadius: BorderRadius.circular(radius),
 ),
 child: ClipRRect(
 borderRadius: BorderRadius.circular(radius),
 child: CachedNetworkImage(
 placeholder: (context, url) =&gt; Container(
 child: Center(
 child: CircularProgressIndicator(
 valueColor: new AlwaysStoppedAnimation&lt;Color&gt; 
 (colorWhite),
 ),
 ),
 height: imageArea,
 decoration: BoxDecoration(
 borderRadius: BorderRadius.all(Radius.circular(10.0))),
 ),
 errorWidget: (context, url, error) =&gt; Material(
 child: Image.asset(
 placeHolder,
 width: imageWidth,
 height: imageHeight,
 fit: BoxFit.fill,
 ),
 borderRadius: BorderRadius.all(Radius.circular(20.0)),
 clipBehavior: Clip.hardEdge,
 ),
 imageUrl: image,
 width: imageWidth,
 height: imageHeight,
 fit: fit),
 ),
 );
 }
}
</code></pre>
You can use this custom widget created using CachedNetworkImage package. In which in case the image is not loaded from network we are using CircularProgressBarIndicator while in case of error that the network image is not loaded we can use error widget and can pass an alternative image from assets.

blocks|key|539092|text|使用此包图像|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|539093|Widget+getNetworkImage({
++double?+height+=+45.0,
++double?+width+=+45.0,
++double?+borderRadius+=+10.0,
++bool?+showCircularProgressIndicator,+//<==+this+is+for+loader
++required+String+url,
})+{
++return+ClipRRect(
++++borderRadius:+BorderRadius.circular(borderRadius+??+0.0),
++++child:+SizedBox(
++++++height:+height,
++++++width:+width,
++++++child:+CachedNetworkImage(
++++++++fit:+BoxFit.fill,
++++++++imageUrl:+url,
++++++++placeholder:+(context,+url)+{
++++++++++showCircularProgressIndicator+??=+true;
++++++++++if+(showCircularProgressIndicator+==+true)+{
++++++++++++return+Center(
++++++++++++++++child:+Container(
++++++++++++++padding:+const+EdgeInsets.all(7),
++++++++++++++decoration:+BoxDecoration(color:+const+Color(0xff0C59EA).withOpacity(0.35),+borderRadius:+BorderRadius.circular(10)),
++++++++++++));
++++++++++}+else+{
++++++++++++return+const+Center(child:+SizedBox());
++++++++++}
++++++++},
++++++++errorWidget:+(context,+url,+error)+{+//<==+if+you+get+error+in+image
++++++++++return+Image.asset(((height+??+45)+>=+100+%7C%7C+(width+??+45.0)+>=+100)+?+Assets.imagesCommonPlaceholder+:+Assets.imagesLogoPlaceholder,+fit:+BoxFit.cover);//<==+use+your+app+placeholder+or+logo+for+better+UX.
++++++++},
++++++),
++++),
++);
}|code-block|syntax|javascript|539094|试着用这种方式。|539095|+getNetworkImage(
++++++url:+"your-image-url-here",
++++++borderRadius:+15,+//<==+if+you+like+to+give+border+radius
++++++height:+60,+//<==+if+you+like+to+give+height
+++++width:+60,+//<==+if+you+like+to+give+width
+++)|539096|entityMap|0|LINK|mutability|MUTABLE|url|https://pub.dev/packages/cached_network_image^0|4|2|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

use this package <a href="https://pub.dev/packages/cached_network_image" rel="nofollow noreferrer">https://pub.dev/packages/cached_network_image</a>
<pre><code>Widget getNetworkImage({
 double? height = 45.0,
 double? width = 45.0,
 double? borderRadius = 10.0,
 bool? showCircularProgressIndicator, //&lt;== this is for loader
 required String url,
}) {
 return ClipRRect(
 borderRadius: BorderRadius.circular(borderRadius ?? 0.0),
 child: SizedBox(
 height: height,
 width: width,
 child: CachedNetworkImage(
 fit: BoxFit.fill,
 imageUrl: url,
 placeholder: (context, url) {
 showCircularProgressIndicator ??= true;
 if (showCircularProgressIndicator == true) {
 return Center(
 child: Container(
 padding: const EdgeInsets.all(7),
 decoration: BoxDecoration(color: const Color(0xff0C59EA).withOpacity(0.35), borderRadius: BorderRadius.circular(10)),
 ));
 } else {
 return const Center(child: SizedBox());
 }
 },
 errorWidget: (context, url, error) { //&lt;== if you get error in image
 return Image.asset(((height ?? 45) &gt;= 100 || (width ?? 45.0) &gt;= 100) ? Assets.imagesCommonPlaceholder : Assets.imagesLogoPlaceholder, fit: BoxFit.cover);//&lt;== use your app placeholder or logo for better UX.
 },
 ),
 ),
 );
}
</code></pre>
try using this way.
<pre><code> getNetworkImage(
 url: &quot;your-image-url-here&quot;,
 borderRadius: 15, //&lt;== if you like to give border radius
 height: 60, //&lt;== if you like to give height
 width: 60, //&lt;== if you like to give width
 )
</code></pre>

<h3>I have many network images that are being displayed in my app.</h3>
When these images are being loaded... Nothing shows on the screen (the screen remains blank for about 3-5 seconds, time for the image to be displayed)
<h3>How to show something like a loader or animation while the image is being loaded?</h3>

Add placeholder to a network image in flutter

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有许多网络图像正在我的应用程序中显示。当这些图像被装载时..。屏幕上没有显示任何内容(屏幕保持空白约3-5秒，显示图像的时间)。如何在加载图像时显示类似于加载程序或动画的内容？

问将占位符添加到网络图像中。
EN

回答 5

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问将占位符添加到网络图像中。EN

回答 5

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问将占位符添加到网络图像中。
EN