Math In Android?

How can I write this in math functi开发者_运维技巧on in Android, im stuck on how to multiply things and use atan2:

Math.atan2(posY, posX) * 180/Math.PI;

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Try this,

((Math.atan2(posY, posX)) * 180)/Math.PI

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You imported java.lang.Math, correct?

http://developer.android.com/reference/java/lang/Math.html

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Atan2 is generally used to find the angle from one point to another. Usually the parameters are the Y-difference between the two points and the X-difference between the two points:

 double deltaX=endX-startX;
 double deltaY=endY-startY;
 double angleInDegrees=Math.atan2(deltaY,deltaX) * 180 / Math.PI;

The conversion to degrees (* 180 / Math.PI) is needed because atan2 returns radians, not degrees.