blocks|key|4326057|text|在Universal+Image+Loader的issue部分已经发布了两个解决方案。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4326058|4326059|您可以使用自定义的displayer：|4326060|new+FadeInBitmapDisplayer(300)+{

++@Override
++++++++++++public+Bitmap+display(Bitmap+bitmap,+ImageView+imageView,+LoadedFrom+loadedFrom)+{
++++++++++++++++if+(loadedFrom+!=+LoadedFrom.MEMORY_CACHE)+{
++++++++++++++++++++return+super.display(bitmap,+imageView,+loadedFrom);
++++++++++++++++}+else+{
++++++++++++++++++++imageView.setImageBitmap(bitmap);
++++++++++++++++++++return+bitmap;
++++++++++++++++}
++++++++++++}

++++++++}|code-block|syntax|javascript|4326061|4326062|+BitmapDisplayer+displayer+=+new+FadeInBitmapDisplayer(500)+{

++++++++@Override
++++++++public+Bitmap+display(Bitmap+bitmap,+ImageView+imageView,
++++++++++++++++LoadedFrom+loadedFrom)+{
++++++++++++if+(loadedFrom+!=+LoadedFrom.MEMORY_CACHE)+{
++++++++++++++++return+super.display(bitmap,+imageView,+loadedFrom);
++++++++++++}+else+{
++++++++++++++++imageView.setImageBitmap(bitmap);
++++++++++++++++return+bitmap;
++++++++++++}
++++++++}

++++};
++++DisplayImageOptions+options+=+new+DisplayImageOptions.Builder()
++++++++++++.cacheInMemory(true).resetViewBeforeLoading(true)
++++++++++++.showImageForEmptyUri(R.drawable.thumbnail_no_image)
++++++++++++.showImageOnFail(R.drawable.thumbnail_no_image)
++++++++++++.displayer(displayer).build();
++++ImageLoaderConfiguration+config+=+new+ImageLoaderConfiguration.Builder(
++++++++++++context).defaultDisplayImageOptions(options)
++++++++++++.memoryCacheSize(2+*+1024+*+1024).build();
++++sLoader.init(config);|4326063|entityMap^0|1|M|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|V|8|@]|D|@]|E|$]]|$1|G|3|H|5|6|7|W|8|@]|D|@]|E|$]]|$1|I|3|J|5|K|7|X|8|@]|D|@]|E|$L|M]]|$1|N|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]|$1|O|3|P|5|K|7|Z|8|@]|D|@]|E|$L|M]]|$1|Q|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|R|$]]

There is two solution already posted in the issue section of <code>Universal Image Loader</code>.

<a href="https://github.com/nostra13/Android-Universal-Image-Loader/issues/395#issuecomment-24389369" rel="nofollow">Solution #1:</a>

You can use custom displayer:

<pre><code>new FadeInBitmapDisplayer(300) {

 @Override
 public Bitmap display(Bitmap bitmap, ImageView imageView, LoadedFrom loadedFrom) {
 if (loadedFrom != LoadedFrom.MEMORY_CACHE) {
 return super.display(bitmap, imageView, loadedFrom);
 } else {
 imageView.setImageBitmap(bitmap);
 return bitmap;
 }
 }

 }
</code></pre>

<a href="https://github.com/nostra13/Android-Universal-Image-Loader/issues/395#issuecomment-25402398" rel="nofollow">Solution #2:</a>

<pre><code> BitmapDisplayer displayer = new FadeInBitmapDisplayer(500) {

 @Override
 public Bitmap display(Bitmap bitmap, ImageView imageView,
 LoadedFrom loadedFrom) {
 if (loadedFrom != LoadedFrom.MEMORY_CACHE) {
 return super.display(bitmap, imageView, loadedFrom);
 } else {
 imageView.setImageBitmap(bitmap);
 return bitmap;
 }
 }

 };
 DisplayImageOptions options = new DisplayImageOptions.Builder()
 .cacheInMemory(true).resetViewBeforeLoading(true)
 .showImageForEmptyUri(R.drawable.thumbnail_no_image)
 .showImageOnFail(R.drawable.thumbnail_no_image)
 .displayer(displayer).build();
 ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
 context).defaultDisplayImageOptions(options)
 .memoryCacheSize(2 * 1024 * 1024).build();
 sLoader.init(config);
</code></pre>

blocks|key|4326094|text|我遇到了同样的问题，并提出了如下解决方案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4326095|在getview方法中，在声明您的imageview之后，尝试将以下行作为第一行|4326096|myImageView.setImageResource(R.drawable.adefaultimage);|code-block|syntax|javascript|4326097|这将首先在imagview中显示默认图像，并将避免重复图像，直到imageloader加载真实图像为止|4326098|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I faced the same problema and went with a solution as follows

Inside the getview method after declaring your imageview try the following line as first line

<pre><code>myImageView.setImageResource(R.drawable.adefaultimage);
</code></pre>

this will first show a defaultimage in the imagview and will avoid duplication of images till imageloader loads the real one

blocks|key|2859183|text|为此，请执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2859184|在list适配器中使用android+Lru缓存。第一次，它看起来非常复杂，但它有更多的好处。|2859185|使用Lru缓存您的图像存储在缓存中，当它将显示，然后检查缓存，如果它将存在，那么它将不会下载，并将从存储的缓存中使用。您还可以为您的应用程序提供缓存大小并清除它。|2859186|下面有一些链接：|2859187|教程：|2859188|2859189|http://developer.android.com/training/displaying-bitmaps/cache-bitmap.html|ordered-list-item|offset|length|2859190|http://developer.android.com/reference/android/util/LruCache.html|2859191|2859192|示例：|2859193|2859194|http://android-er.blogspot.in/2012/07/caching-bitmaps-with-lrucache.html|2859195|http://android-er.blogspot.in/2012/07/apply-lrucache-on-gridview.html|2859196|2859197|entityMap|0|LINK|mutability|MUTABLE|url|1|2|3^0|0|0|0|0|0|0|0|22|0|0|0|1T|1|0|0|0|0|0|20|2|0|0|1X|3|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1B|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1C|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|1D|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1E|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|1G|8|@]|9|@$N|1H|O|1I|1|1J]]|A|$]]|$1|P|3|Q|5|M|7|1K|8|@]|9|@$N|1L|O|1M|1|1N]]|A|$]]|$1|R|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1P|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|V|3|W|5|M|7|1R|8|@]|9|@$N|1S|O|1T|1|1U]]|A|$]]|$1|X|3|Y|5|M|7|1V|8|@]|9|@$N|1W|O|1X|1|1Y]]|A|$]]|$1|Z|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|20|8|@]|9|@]|A|$]]]|11|$12|$5|13|14|15|A|$16|L]]|17|$5|13|14|15|A|$16|Q]]|18|$5|13|14|15|A|$16|W]]|19|$5|13|14|15|A|$16|Y]]]]

To achieve this : 

Use android Lru cache in your list adapter. First time its looking very complex but its have more benifits.

Using Lru cache your image store in cache and when it will display then check from cache if it will exist then it will not down load and it will use from stored cache memory. You can also give cache memory size for your application and clear it.

Below have some links: 

Tutorials: 

<ol>
<li><a href="http://developer.android.com/training/displaying-bitmaps/cache-bitmap.html" rel="nofollow">http://developer.android.com/training/displaying-bitmaps/cache-bitmap.html</a></li>
<li><a href="http://developer.android.com/reference/android/util/LruCache.html" rel="nofollow">http://developer.android.com/reference/android/util/LruCache.html</a></li>
</ol>

Example :

<ol>
<li><a href="http://android-er.blogspot.in/2012/07/caching-bitmaps-with-lrucache.html" rel="nofollow">http://android-er.blogspot.in/2012/07/caching-bitmaps-with-lrucache.html</a></li>
<li><a href="http://android-er.blogspot.in/2012/07/apply-lrucache-on-gridview.html" rel="nofollow">http://android-er.blogspot.in/2012/07/apply-lrucache-on-gridview.html</a></li>
</ol>

blocks|key|872255|text|我尝试了上面的解决方案，但没有找到有用的，最后我解决了我的问题，从url保存图像到设备(作为位图)，然后从那里进入列表视图。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|872256|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|$]]

I tried above solutions but not find usefull, Finally i solved my problem by saving images from url to device(as bitmap) then get in list view from there.

I am using <code>displayImage()</code> method of UniversalImageLoader library in the adapter class, which sets images(from url) in the list items. i want if i reset adapter in my listview, images should not reload if the urls are same as previous urls.

How to prevent reloading of images in listview with custom adapter when refresh listview

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。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我在适配器类中使用UniversalImageLoader库的displayImage()方法，它在列表项中设置图像(来自url)。我希望如果我在列表视图中重置适配器，如果urls与以前的urls相同，则不应重新加载图像。

问如何在刷新listview时防止自定义适配器重新加载listview中的图像
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在刷新listview时防止自定义适配器重新加载listview中的图像EN