Interactive data with native end Android

Recently there is a requirement in the project, which points to the direction of the path.

The main thing is to get the direction of the angle, in the page according to the angle of animation to turn,

Because the angle of the data is the original terminal, Android to calculate some algorithms are finished, the front-end directly accept the angle to do the display.

First on the code

Text Name: javascript<! DOCTYPE html>
Very simple, the function name to Android, so that the front-end can accept the data.
Finally execute a piece of code so that the arrows rotate with the angle is OK.
$ (' Arrow t '). CSS ({' Transform ': ' Rotate (' +rotation+ ' deg) '});
Interactive data with native end Android