This android video tutorial explains how to create memory cache for android. Using this method will have a dramatic effect on performance for android applications. Implementation Create LruCache final int maxMemorySize = (int) Runtime.getRuntime().maxMemory() / 1024; final int cacheSize = maxMemorySize / 10; mMemoryCache = new LruCache<String, Bitmap>(cacheSize) { @Override protected int sizeOf(String key, Bitmap […]

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This tutorial is about resolving concurrency issues that happen when issuing AsyncTasks when using RecyclerViews in android applications. Get Code You can download the code from github here https://github.com/mobapptuts/recyclerview_image_gallery.git Tag concurrency Or else run this command git clone –branch concurrency https://github.com/mobapptuts/recyclerview_image_gallery.git Create a class derived from BitmapDrawable public static class AsyncDrawable extends BitmapDrawable { final WeakReference<BitmapWorkerTask> taskReference; […]

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In this performance tutorial we use the BitmapFactory.Options inSampleSize for loading smaller images with subsampling therefore saving memory & cpu resources, resulting in more responsiveness especially in scrolling. Method Create a scale factor algorithm private int calculateInSampleSize(BitmapFactory.Options bmOptions) { final int photoWidth = bmOptions.outWidth; final int photoHeight = bmOptions.outHeight; int scaleFactor = 1; if(photoWidth > TARGET_IMAGE_VIEW_WIDTH […]

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Part 2 – Addresses the issue with the bitmaps being loaded from the filesystem in the UI thread by creating asynctask in android which in effect creates a background thread to do the file loading. Steps Create the AsyncTask Class public class BitmapWorkerTask extends AsyncTask<File, Void, Bitmap> { WeakReference<ImageView> imageViewReferences; public BitmapWorkerTask(ImageView imageView) { imageViewReferences […]

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This is part 1 of the android tutorial performance series. We look for a quick and fast solution with testing Picasso image library. It’s mainly a convenience library for downloading images from the internet but also has caching support which we will be looking to use to improve the performance of the recyclerview image gallery […]

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  Create android video app is a short video tutorial describing how to create an android video application. The concepts are based on the how to create an android camera app using intents, so if you are brand new to android programming I recommend you view that series first. For I will be skipping the fundamentals […]

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