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copied!<p><a href="http://developer.android.com/training/displaying-bitmaps/load-bitmap.html" rel="nofollow">http://developer.android.com/training/displaying-bitmaps/load-bitmap.html</a></p> <p>The link guides you on how to load bitmaps efficiently especialcy the topic under <strong>Load a Scaled Down Version into Memory</strong></p> <p>You should recycle bitmaps when not in use.</p> <pre><code> bitmaps.recycle(); </code></pre> <p>Bitmaps are also stored on heap starting from honeycomb.So recycle bitmaps when not in use.</p> <p><a href="http://www.youtube.com/watch?v=_CruQY55HOk" rel="nofollow">http://www.youtube.com/watch?v=_CruQY55HOk</a>. If you run into memory leaks use a MAT Analyzer to find and fix it. The video has a talk on the topic. It also explains how to manage memory.</p> <p>If you want to display large number of bitmaps use a Universal Image Loader. Use a listview or grdiview to display images.</p> <p><a href="https://github.com/nostra13/Android-Universal-Image-Loader" rel="nofollow">https://github.com/nostra13/Android-Universal-Image-Loader</a>.</p> <p>It is based on Lazy List(works on same principle). But it has lot of other configurations. I would prefer to use <em>Universal Image Loader</em> coz it gives you more configuration options. You can display a error image if downlaod failed. Can display images with rounded corners. Can cache on disc or memory. Can compress image.</p> <p>In your custom adapter constructor</p> <pre><code> File cacheDir = StorageUtils.getOwnCacheDirectory(a, "your folder"); // Get singletone instance of ImageLoader imageLoader = ImageLoader.getInstance(); // Create configuration for ImageLoader (all options are optional) ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(a) // You can pass your own memory cache implementation .discCache(new UnlimitedDiscCache(cacheDir)) // You can pass your own disc cache implementation .discCacheFileNameGenerator(new HashCodeFileNameGenerator()) .enableLogging() .build(); // Initialize ImageLoader with created configuration. Do it once. imageLoader.init(config); options = new DisplayImageOptions.Builder() .showStubImage(R.drawable.stub_id)//display stub image .cacheInMemory() .cacheOnDisc() .displayer(new RoundedBitmapDisplayer(20)) .build(); </code></pre> <p>In your getView()</p> <pre><code> ImageView image=(ImageView)vi.findViewById(R.id.imageview); imageLoader.displayImage(imageurl, image,options);//provide imageurl, imageview and options. </code></pre> <p>You can configure with other options to suit your needs.</p> <p>Along with lazy loading/Universal Image Loader you can view holder for smooth scrolling and performance. <a href="http://developer.android.com/training/improving-layouts/smooth-scrolling.html" rel="nofollow">http://developer.android.com/training/improving-layouts/smooth-scrolling.html</a>.</p>

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