Qibla compass in Android

Question

I have try much but can not make Qibla compass for my application. I can't understand what I do. I need Qibla compass that works perfectly.

Are you trying to program one? What are you having trouble with? What have you tried? — CaseyB, Jun 04 '12 at 20:00

score 10 · Accepted Answer · edited Aug 05 '18 at 19:37

10

You know the location of Mecca and you know the users current location (if you have GPS or some other location provider). The bearing is given by this formula, latitudes and longitudes should be in radians.

float lonDelta = (lon2 - lon1);
float y = Math.sin(lonDelta) * Math.cos(lat2);
float x = Math.cos(lat1) * Math.sin(lat2) - Math.sin(lat1) * Math.cos(lat2) * Math.cos(lonDelta);
float brng = Math.atan2(y, x).toDeg();

brng is the direction in degrees.

You could also explore the Location.bearingTo() method, see here.

edited Aug 05 '18 at 19:37

halfer

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answered Jun 04 '12 at 20:21

Simon

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I am getting erro: `Cannot invoke toDeg() on the primitive type double` – MaxEcho May 26 '14 at 11:47
2

Solved it `float brng = (float) Math.toDegrees(Math.atan2(y, x));` – MaxEcho May 26 '14 at 12:03

Qibla compass in Android

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