Using android glide image library

| Performance, tutorials | 0 Comments
17 Aug

In part 7 of the android performance optimisations for recyclerview image galleries we will be using android glide image library to compare image gallery scrolling performance against the other solutions in this tutorial series. ADD GRADLE DEPENDENCY FOR GLIDE dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.android.support:recyclerview-v7:22.0.+' compile 'com.github.bumptech.glide:glide:3.6.0' compile 'com.squareup.picasso:picasso:2.5.2' } CALL GLIDE […]

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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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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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Creating AsyncTask in Android

| Performance | 0 Comments
14 Jul

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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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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