SDL-mirror/android-project
Sam Lantinga e8d2a8b3b8 Fixed bug 2156 - Android: Accelerometer values fed to joystick driver are inverted for the X axis and wrong for Z
Denis Bernard

Background information: http://developer.android.com/reference/android/hardware/SensorEvent.html#values

Steps to reproduce: compile testjoystick.c as an android app (change screen size according to your device). While running the app, also run:

adb logcat -c; adb logcat -s 'SDL:*' 'SDL/APP:*'

When tilting the device left/right, the joystick moves in the opposite direction of what one would expect. Or at least, the behaviour is not consistent with the Y axis.

Also when the device sits on a table (obviously not moving), the Z axis value oscillates between -32000 and +32000 (by overflow):

I/SDL/APP ( 1994): Joystick 0 axis 2 value: 32511
I/SDL/APP ( 1994): Joystick 0 axis 2 value: 32575
I/SDL/APP ( 1994): Joystick 0 axis 2 value: 32383
I/SDL/APP ( 1994): Joystick 0 axis 2 value: -32386
I/SDL/APP ( 1994): Joystick 0 axis 2 value: -32450
I/SDL/APP ( 1994): Joystick 0 axis 2 value: -32578

This is caused by the accelerometer yielding a constant value around 9.81 for Z and feeding something like 0.9 to 1.1 to the joystick driver, resulting in the overflow.

Proposed fix in SDLActivity.java (swap X and subtract G from Z reading)
2013-10-20 23:52:02 -07:00
..
jni Fixed bug 2146 - Enable static linking of libSDL on Android 2013-10-10 21:51:39 -07:00
res Fixed bug 1779 - SDL's Android project template has old default icons from Android. 2013-04-02 07:55:25 -07:00
src/org/libsdl/app Fixed bug 2156 - Android: Accelerometer values fed to joystick driver are inverted for the X axis and wrong for Z 2013-10-20 23:52:02 -07:00
AndroidManifest.xml Updated names of README files in source comments. 2013-06-09 11:58:31 +02:00
ant.properties Updated the Android project template and README.android 2012-11-02 02:37:49 -07:00
build.properties Added the Android project and lots of info to README.android 2011-01-06 17:12:31 -08:00
build.xml Updated the Android project template and README.android 2012-11-02 02:37:49 -07:00
default.properties Updated the Android project template and README.android 2012-11-02 02:37:49 -07:00
proguard-project.txt Updated the Android project template and README.android 2012-11-02 02:37:49 -07:00
project.properties Backed out changeset: 9cef1005df5f 2013-04-01 13:20:22 -03:00