Make sure you have an app/src/androidTest/java folder. The default setting (the Android perspective) hides certain folders: This will show us a full view of everything contained in the project. There are several steps needed to setup Espresso with Android Studio:įirst, let's change to the Project perspective in the Project Window. In many circles Espresso is considered to be a full replacement for Robotium (see this stack overflow post that compares Robotium to Espresso). if a particular view is off screen, the test won't be able to interact with it).Įspresso's simple and extensible API, automatic synchronization of test actions with the UI of the app under test, and rich failure information make it a great choice for UI testing. Espresso tests run on actual device or emulator (they are instrumentation based tests) and behave as if an actual user is using the app (i.e. Complete SourceĪnd, of course, all of this might not make sense without a working code, which you can access on GitHub in my gallery-in-listview repository.Espresso is a UI test framework (part of the Android Testing Support Library) that allows you to create automated UI tests for your Android app. Prior to launching new ImageLoaderTask(.) in List Adapter loadBitmap(.) method.
We would check the current count against arbitrary maximum Our AsyncTask class could then increment the count in the AsyncTask constructor and decrement in onPostExecute() method. import import 4.util.LruCache public class BitmapCache Thus, we can create a fairly simple class for our LRUCache. LRUCache that helps us cache our bitmaps. It doesn’t make sense for us to keep default ListView behavior which continuously frees up and loads our bitmaps when our users scroll back and forth through the list.Ĭaching allows us to store bitmaps in memory and quickly retrieve them on consecutive views while scrolling. Thus, to display pictures in ListView is not straightforward and requires several performance considerations. Just think about user quickly scrolling through a list of hundreds of photos each the size of 3-10 megabytes. Worse yet, the application might run out of memory and crash while loading bitmaps. A simple task such as displaying your gallery photos in a ListView component can lead to a significant loss of performance in your Android application, to the point where it would render the application
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