To deep copy an array, you can use System.arraycopy(..) http://developer.android.com/reference/java/lang/System.html#arraycopy%28java.lang.Object,%20int,%20java.lang.Object,%20int,%20int%29
System.arraycopy(b, 0, a, 0, 3); but for a float array of length 3, you can simply write a[0]=b[0]; a[1]=b[1]; a[2]=b[2]; or for (i=0; i<3; i++) a[i] = b[i]; I've never tried to profile which of the 3 ways is actually the fastest on a real Android device. If someone has the time, please try all 3 in a tight loop and report back :-) (there is also for(i=3; i-->0;) a[i] = b[i]; which may be even faster?) Note: all assume that you have initialized a already beforehand, a = new float[3]; Peli On Aug 25, 8:24 am, Rud <[email protected]> wrote: > Hi, > > The code is originally from my Blog. The reason for the clone is > explained there. > > I admit to not having worked with Java enough to have the deep > understanding of how containers deal with objects. In my application I > ran into a problem trying to make a copy of an array and had to write > my own copy. > > I had a set of data that gets consumed while the app runs. I wanted to > reset that data at times. I put the data in an array and then cloned > it to the working array. I was surprised when the original data got > changed when the cloned data was changed. I also realized that the > sensor code wasn't doing what I thought it was but haven't taken the > time to adjust it. > > How in Java do you actually make a deep copy of an array? > > Rudhttp://mysticlakesoftware.blogspot.com/ > > On Aug 21, 7:07 am, Peli <[email protected]> wrote: > > > > .... = event.values.clone(); > > > Note that this creates new objects constantly that have to be garbage > > collected later. Depending on the kind of application, it may be > > better to just copy the values into a persisting array. > > > Peliwww.openintents.org > > > On Aug 21, 4:06 am, mscwd01 <[email protected]> wrote: > > > > Heres my code, which works: > > > > public void onSensorChanged(SensorEvent event) { > > > > Sensor sensor = event.sensor; > > > int type = sensor.getType(); > > > switch (type) { > > > case Sensor.TYPE_MAGNETIC_FIELD: > > > mags = event.values.clone(); > > > isReady = true; > > > break; > > > case Sensor.TYPE_ACCELEROMETER: > > > accels = event.values.clone(); > > > break; > > > case Sensor.TYPE_ORIENTATION: > > > orients = event.values.clone(); > > > break; > > > } > > > > if (mags != null && accels != null && isReady) { > > > isReady = false; > > > > SensorManager.getRotationMatrix(R, I, accels, mags); > > > SensorManager.remapCoordinateSystem(R, > > > SensorManager.AXIS_Y, SensorManager.AXIS_MINUS_X, outR); > > > SensorManager.getOrientation(outR, values); > > > > azimuth = > > > getAzimuth(-convert.radToDeg(values[0])); > > > pitch= convert.radToDeg(values[1]); > > > roll = -convert.radToDeg(values[2]); > > > > } > > > > } > > > > On Aug 21, 2:39 am, Mike Collins <[email protected]> wrote: > > > > > I have a sensor event handler that gets fired and I have no problem > > > > getting and processing acceleration readings. However this code > > > > always fails. > > > > > if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) > > > > { > > > > float[] geomagnetic = new float[3]; > > > > geomagnetic[0] = geomagnetic[1] = > > > > geomagnetic[2] = 0; > > > > > float[] r = new float[9]; > > > > float[] I = new float[9]; > > > > boolean b = SensorManager.getRotationMatrix(r, > > > > I, event.values.clone > > > > (), event.values.clone()); > > > > if ( ! b) > > > > { > > > > Log.e(LOG_TAG, "getRotationMatrix > > > > failed"); > > > > return; > > > > } > > > > ... > > > > > tia, > > > > mike- Hide quoted text - > > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
