Android :: Google Skymap Reversed Compass?
Nov 2, 2009
I just installed google sky map and started it up all excited and I just don't get it. I have searched this forum and done google searches and no-one seems to have my issue so I think its something I am not getting but I cant see what it is. I fire up the app and it looks good.. but... the map on the screen goes in the opposite direction. As I rotate left the stars on the screen move left and as I rotate right the move right. up and down movements are fine.
When I point north or south it is correct but as I rotate the horizon says east when I point it west and west when I point it east.? I have recalibrated my compass.. When I run the compass app it works correctly.. even google maps in street view works correctly. It is only google sky map that seems to have reversed east and west. Has anyone else seen this? Is it just me being dumb?
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Aug 22, 2010
First day or two Google Sky worked fine, but I realized yesterday Google Sky didn't want to move left/right from holding the phone sideways but would move up/down. I found if I gave is a good shake left/right it would work right as far as I could tell. I checked around for what it might be and saw it could be a problem with the magnetic sensor. I tried the compass app and I get a "abnormal magnetic field detected" message right away. Should I return this or maybe reset some sort of setting or is there another way to calibrate?
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May 31, 2010
I just tried an iPhone and I saw that it has a handy compass mode in Google Maps which rotates the map to the direction you are looking to. If you don't know what I mean here is a video showing it: YouTube - iPhone 3G S; Google Maps + Compass
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Oct 4, 2009
Is it not possible to view Googlemaps in compass mode, I mean in map view, not streetview. Like on the IPhone?
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Nov 22, 2010
Is it possible to make the google maps work with the compass and spin the map around according to where you are pointing.I notice the iphone4 does this.Have 2.1
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Oct 12, 2009
How to play video in a time reversed direction? The requirement is to loop playing forward and backward repeatedly.
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Oct 7, 2010
Does anyone know how to make a View reversed, I have a horizontal ProgressBar and I want it to right to left instead of left to right
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Dec 5, 2009
When importing my contacts from the sim card, they all now appear on the phone back to front i.e: natwest bank now appears as bank; natwest and its a major ache. Can anyone shed some light on this?
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Aug 10, 2010
I got an automatic update for 2.1 on my HTC Legend last week, it is now reversing the whole of each thread for text messages. that is it shows the oldest messages first, and i have to scroll through all the messages on that thread to read the new one i have just received. some of these threads are 100's of messages. and i need to keep some of the info on them etc so don't want to delete whole threads. Before the update it showed the newest message first and was great. can't find anyway to change a setting for this.
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Nov 10, 2009
I discovered an option in street view that is called "Compass View". Not sure what use it is but I thought it was cool. You have to hold the phone in portrait as opposed to landscape for the compass to work...check it out.
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May 18, 2010
Has anyone noticed that when you hold the power button, the Silent Mode will be listed as ON when the volume is on? Isn't this backwords? Then to silent the phone, I tap the Silent mode, and it switches to OFF and then the phone is silent (with the (/) through a music note in the taskbar)
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Jan 7, 2010
I have the HTC hero right now with the Android 1.5 and was wondering if there is a compass app that i can download which is similar to the iPhone 3GS?
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Aug 12, 2009
I've modified the code a bit since the last time, and now it crashes at runtime. I've got the log-cat and code below. how to go about debugging.
CODE:..................
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Aug 21, 2009
I'm trying to make a map with showing my location with an arrow that point to the way we are facing. the arraw image is something like this:
^ 0
Always pointing north, so i rotate it with sensor orientation event ( image.rotate(values[0]) )
I would like to ask if google map's north is always on 12 o'clock? because i try sometimes the arrow point to wrong direction. how to accurately make this thing works?
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Sep 13, 2010
I have a marker on the map using an Overlay. I also have access to the compass sensor which I'm able to show a textView with the orientation values (0 to 359). How can I apply this values to the marker? (which is a drawable). I already have a MAtrix created but when I insert the orientation value gives me an error, here it is:
GeoPoint geopoint = new GeoPoint((int) (newLocation.getLatitude() * 1E6),
(int) (newLocation.getLongitude() * 1E6)); Paint paint = new Paint();
Point pt = new Point(); mapView.getProjection().toPixels(geopoint, pt);
Bitmap bmp = BitmapFactory.decodeResource(getResources(),R.drawable.user2);
Matrix matrix = new Matrix(); matrix.postTranslate(-25, -25);
matrix.postRotate(direction); matrix.postTranslate(pt.x, pt.y);
paint.setAntiAlias(true); paint.setFilterBitmap(true);
int width = bmp.getWidth(); int height = bmp.getHeight();
Bitmap changedBitmap = Bitmap.createBitmap(bmp, 0, 0, width, height, matrix, true);
BitmapDrawable icon = new BitmapDrawable(changedBitmap);
icon.setBounds(0, 0, icon.getIntrinsicWidth(), icon.getIntrinsicHeight());
userOverlay useroverlay = new userOverlay(icon); useroverlay.addItem(item);
mapView.getOverlays().add(useroverlay);
I used the value retrieved from the sensor on "direction" but it doesn't work.
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Jul 22, 2009
Am researching a problem with compass and sensor values returned by the phone. I found this thread: http://groups.google.com/group/android-developers/browse_thread/threa. Which seems related, but it's old so I'm starting a new one. I'm getting stuck values from both the compass and orientation sensors. It was fine yesterday, but today, I'm only getting values in a limited range (e.g. compass headings from 240 - 290), no matter how I orient the device. What's even more odd is that the radians returned from the call to Sensor Manager.get Orientation(), which returns radians, is giving consistently out of range values. Anyone see this same behavior, and if so, any fixes? Here's some sample sensor data. Format is heading, pitch, roll. The first set contains raw values, the second set contains values after I've applied the orientation matrix generated by the Sensor Manager. The third set contains values after I've smoothed the data with my own algorithm.
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Mar 4, 2010
I want to test a compass app on the emulator. Is this possible or do i have to use a real device. Also I do not want to use gps.
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Oct 31, 2010
I want to create a non-generic compass that uses rotating directions instead of a rotating needle as in the conventional compass. The drawing is like the illustration below..................
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Jun 5, 2009
How can I implement the Compass function having 2 geopoints (start and destination)?
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Jun 4, 2010
I can't find much information out there on Android's hardware compass. I keep trying to setup my criteria to force Android to use the hardware compass. Basically my problem is I want the bearing to update even while the device is stationary. From my understanding the GPS will only update your bearing when your moving. I'd like bearing to update regardless if your moving or not. I've tried tricking the device in to thinking it's moving by setting the speed at a constant 10 but the bearing returns 0.0 always. My device for testing (currently) is a HTC tattoo. It has a compass so that's not the problem. So my question is, is there a way to get the bearing to update using hardware compass or not? regardless if your moving or not?
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Jan 11, 2010
I need to know if there is an interface to access the direction in which the phone is pointing.
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Sep 16, 2010
I'm trying to implement something that I don't even know if it's possible. So I have this class which implements a SensorEventListener like this:
private SensorEventListener mySensorEventListener = new SensorEventListener(){
@Override public void onAccuracyChanged(Sensor sensor, int accuracy) {
} @Override public void onSensorChanged(SensorEvent event) {
myCompass.updateDirection((float)event.values[0]); } };
And a class that handles the way the compass looks like this:
public static class compassLook extends View {
private Paint paintPointer = new Paint(Paint.ANTI_ALIAS_FLAG);
private Paint paintCircle = new Paint(Paint.ANTI_ALIAS_FLAG);
private Paint paintLeters = new Paint(Paint.ANTI_ALIAS_FLAG);
private boolean firstDraw; private float direction = 0 ;
public compassLook(Context context) { super(context); init();
} public compassLook(Context context, AttributeSet attrs) { super(context, attrs); init();
} public compassLook(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle); init(); } private void init(){
paintPointer.setStyle(Paint.Style.STROKE); paintPointer.setStrokeWidth(3);
paintPointer.setColor(Color.argb(255, 209, 114, 2)); paintCircle.setStyle(Paint.Style.STROKE);
paintCircle.setStrokeWidth(2); paintCircle.setColor(Color.argb(150, 255, 255, 255));
paintLeters.setStyle(Paint.Style.STROKE); paintLeters.setStrokeWidth(1);
paintLeters.setColor(Color.argb(230, 255, 255, 255)); paintLeters.setTextSize(12);
firstDraw = true; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),
MeasureSpec.getSize(heightMeasureSpec)); } @Override protected void onDraw(Canvas canvas) {
int cxCompass = (getMeasuredWidth()/2); int cyCompass = (getMeasuredHeight()/2);
float radiusCompass; if(cxCompass > cyCompass){ radiusCompass = (float) (cyCompass * 0.9);
} else{ radiusCompass = (float) (cxCompass * 0.9);}
canvas.drawCircle(cxCompass-50, cyCompass, radiusCompass, paintCircle);
if(!firstDraw){ // Desenho da linha que aponta canvas.drawLine(cxCompass-50, cyCompass,
(float)(cxCompass-50 + radiusCompass * Math.sin((double)(- direction) * 3.14/180)),
(float)(cyCompass - radiusCompass * Math.cos((double)(-direction) * 3.14/180)),
paintPointer); double mLatitude = (mLocation.getLatitude() / 1E6);
// I get this value from a LM request double mLongitude = (mLocation.getLongitude() / 1E6);
// I get this value from a LM request double picLatitude= Double.parseDouble(picLatitudeString);
// I get this value from a bundle double picLongitude = Double.parseDouble(picLongitudeString);
// I get this value from a bundle float direction = (float)
Math.toDegrees(Math.atan2(picLongitude- mLongitude, picLatitude-mLatitude));
float distancia = (float) (Math.sqrt(Math.pow(mLatitude- picLatitude,
2) + Math.pow(mLongitude-picLongitude,2)))/2;
//Desenho do texto que indica a distancia
canvas.drawText(String.valueOf(distancia) + "Km", cxCompass-30,
cyCompass+20, paintLeters); } } public void updateDirection(float dir)
{ firstDraw = false; direction = dir; invalidate(); } }
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May 4, 2010
I need to build compass for my application.
From reading the documentation it seems there are two reasonable ways of doing this:
Sensor.TYPE_ORIENTATION method: This is the easy way of doing it. The problem with this is it is not accurate. When I compare my reading with Snaptic Compass it is about 10-15 degress off which for my purposes is unacceptable.
Sensor.TYPE_ACCELEROMETER, Sensor.TYPE_MAGNETIC_FIELD and getRotationMatrix() in conjunction with remapCoordinateSystem() and getOrientation() method: The documentation says this "is usually more accurate". The problem is regardless of the delay I register with listener the compass goes crazy even when the device is stationary on flat surface.
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Mar 19, 2009
I am now beginning an app which will use the compass and tilt sensors to determine a persons heading and line of sight. Can I assume the sensors on devices such as the G1 are fairly accurate or can I expect to run into problems such as the compass being 5-10 degress off etc?
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Sep 4, 2010
I just read the developer blog post about non-phone Android devices such as tablets and GoogleTV - http://android-developers.blogspot.com/2010/09/brace-for-future.html.
I'm writing an accelerometer-based game and would like to filter for devices that have an accelerometer (or orientation sensor). Is there a way to do that? It would also be useful to filter for devices with a compass or GPS receiver.
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Dec 26, 2009
I've noticed that I get a slightly different reading from the compass depending on how I hold the phone. If I hold it vertically, its different than when I hold it horizontal (ie parallel to a table or floor). Does anyone know the most accurate way to hold the phone for the compass?
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Nov 18, 2009
I cannot find any tutorial on the web. How can I do it in a simple way?
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Aug 18, 2010
Now that SENSOR_ORIENTATION is deprecated, what's the best practice for obtaining compass reading? The old way was so simple.
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Jul 25, 2012
I have seen applications like gpsstatus which have compass and determines whether the device is heading north south etc. How can i determine the heading of my device?
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Nov 11, 2009
I was just curious as to whether theres an application for a compass for the HTC Hero, similar to the one on the iPhone?
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