Derek Gebhard, Solutions Architect for Amazon, is our guest blogger for this post.
One of the things you will spend time on when building a
Kindle Fire app is testing and debugging. Using a Kindle Fire emulator is the
recommended way to test and debug your mobile apps if you do not have the
device available. This post will cover tips on increasing the performance of
the Kindle
Fire emulators, including the newly released Kindle
Fire HD 8.9” emulator, but will also apply to most other Android emulators.
For Ice Cream Sandwich-based Kindle Fire emulators
(Android SDK 4.0.3, API level 15) you can enable
GPU emulation to significantly improve the performance. One thing to be
aware of: GPU emulation is currently an experimental feature in the Android
tools suite, and may not work on all host hardware configuations or operating
systems. If you experience issues, you may need to disable this functionality.
To enable GPU
emulation, launch the Android Virtual Device Manager. This can be done by
running “android avd” or clicking the Android Virtual Device Manager icon in
Eclipse.
For existing
emulators:
- Select the emulator for which to enable GPU
emulation
- Click “Edit…”
- Check “Use Host GPU” under the Emulation Options
section.
- Click “OK” to save your configuration changes.
When creating a new
emulator:
- Click the “New…”
button
- Add the Kindle Fire details according to our configuration
guide.
- Check “Use Host GPU” under the Emulation Options
section.
- Click “OK” to create your emulator.
Image 1:
Changing the GPU emulation property
To showcase the effect of GPU emulation property, there are
two screenshots below. These GPU measurements were taken on a Windows desktop,
using the Kindle Fire HD 7” emulator. This test included starting the emulator,
running SDK Tester, and accessing the Kindle Fire settings. As you can see, GPU
emulation must be enabled in order for the emulator to leverage the GPU’s
dedicated memory.
Image 2:
GPU emulation set to “no”
Image 3:
GPU emulation set to “yes”
There are also a few other things that can help when running
apps on the Kindle Fire emulators. Below is a list of the other ways we can
increase performance and save time:
- Close any non-essential processes and programs
as the emulator uses a large amount of CPU time and memory when emulating the
device.
- Make the SD card as small as possible, as large
card sizes increase the start-up time
- Enable snapshots to save and restore state to a
‘Snapshot’ file in each AVD, so you can avoid booting when you start the
emulator. Note: This feature is
alpha-quality feature so the emulator window will freeze while its saving the
state after you close the emulator.
Also, GPU emulation and Snapshot cannot be used together.
- Lower the screen size if your app does not
depend upon screen size.
- Restart the adb server if you experience an
increase in the time it takes to install applications on the emulator. This can
occur over time and is solved by running adb kill-server followed by adb
start-server.
