Camera2 API surface preview sizes

| Camera2 API, tutorials | 0 Comments
15 Aug

Part 2 of the camera2 API tutorial series which describes how to setup the camera2 API surface preview sizes. It is important that the supported preview sizes from the camera device closely match the desired preview size of the applications preview display. GitHub You can clone the code from github and then Tag “camera2-surface-preview-sizes” or else run this […]

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Android performance with inBitmap

| Performance, tutorials | 0 Comments
05 Aug

In the Android performance with inBitmap tutorial we add the BitmapFactory.Option’s inBitmap flag which can be used for bitmaps that have been evicted from the memory cache but not yet deallocated. This is only supported for android versions Honeycomb or later. Implementation Create a Set of SoftReferenced Bitmaps CamaraIntentActivity private static Set<SoftReference<Bitmap>> mReuseableBitmap; Initialise the […]

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Create memory cache for android

| Performance, tutorials | 0 Comments
30 Jul

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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Resolving concurrency issues

| Performance, tutorials | 0 Comments
22 Jul

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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Loading smaller images with subsampling

| Performance, tutorials | 0 Comments
19 Jul

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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Testing picasso image library

| Performance, tutorials | 0 Comments
13 Jul

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

| tutorials, video app | 0 Comments
12 Jul

  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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