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- New Trailer Video for Double Star Game
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- Tutorial: How to Implement In-app Billing in Android - Part 1
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- Multitouch Panning and Zooming Examples for Android
- Horizontal Scrolling Pages of Images in Android
- How To Build A Simple Help Screen in Android
- Moving Views In Android - Part 2, Drag and Drop
- Android Rotate and Scale Bitmap Example
- How To Build A Dashboard User Interface In Android
- Drag-Drop for an Android GridView
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Monthly Archives: August 2011
Over the last couple of weeks, I have been testing my Android app on different devices. That work is going well. In this note, I’d like to share a couple of things that came out as side effects of that work, including:
– How to move Android virtual device (AVD) files from an Android Emulator to another machine.
– A set of AVD definitions that I found useful in checking an app on different screen sizes and screen densities.
Knowing how to move AVD files is important for a couple of reasons: (a) if you ever switch machines or do a complete reinstall of your Android environment, it would be good if you could reuse old device definitions rather than having to recreate them; (b) If you are working on a team, it saves a lot of time if there is a shared set of devices that everyone in the team is testing against.
I prepared a presentation for the local Android Meetup group. In the presentation I explained and elaborated on my March 2011 blog article: “How to Build a Dashboard User Interface in Android”. A link is provided to the full presentation. Continue reading
This is my guide to tuning performance of Java programs. It covers both cpu time and object memory analysis. I have found that this works for Java programs and for many Android applications. In the latter case, it helps if your Android application is structured so you can turn a section of an application into a standalone test case. Since many applications have background tasks, often implemented as subclasses of AsyncTask, this is usually easy to do.
The tool I prefer to use is HPROF. It is a simple profiling tool that is available with the Java SDK. It provides a variety of tools so you can address common performance problems, like the following: (1) you are allocating too many objects, which leads to a slow app because of too much garbage collection; (2) you are allocating objects and not properly releasing them, leading to a memory leak; (3) your computations are taking too long.
The topics I cover in this article include: (a) Getting started with HPROF in Eclipse, (b) HPROF Results (cpu times, object allocation), (c) Performance tuning suggestions, and (d) Other Android performance tuning tools. Continue reading