You need basic trigonometry: http://en.wikipedia.org/wiki/Trigonometry
if x and y denote the magnetic field strength in microtesla, then you get the angle through the arc tangent function: phi = Math.atan(y/x); or phi = Math.atan2(y,x); phi is then the angle in radians. Note that you may want to convert phi from radians to degree (using phideg = Math.toDegree(phi);) Note that this only works if your phone lies flat on the desk. In arbitrary orientation, you need more sophisticated conversion that includes x, y, and z and the accelerometer values. Peli www.openintents.org http://www.openintents.org/en/node/6 On 13 Dez., 03:32, Jeffrey <jeffisagen...@gmail.com> wrote: > Okay, so I got a little further, I'm now stuck at the point where I > can pull values, but they are the micro-tesla measurements. How do I > get degrees from this? > > On Dec 12, 8:13 pm, Jeffrey <jeffisagen...@gmail.com> wrote: > > > > > I'm working on an application that will randomly point an arrow in a > > direction, and have that arrow maintain it's direction if the device > > is moved. All I want to do it get the magnetic field readings as > > degrees and I can do it from there. The problem I'm having is getting > > the magnetic field readings. I can't find any tutorials on it and the > > API demo on google's dev site uses deprecated code (figures, google's > > sample code is never n00b friendly). > > > At this point I've got this together but I don't know what I'm > > missing, all the examples I can find are using SensorListener which > > has onSensorChanged(int sensor, float[] values) but > > SensorEventListener does not support "float[] values" > > > What am I missing here? -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
