在哪里保存 Android GPS(纬度，经度)点? [英] Where to save Android GPS (Latitude , Longitude) points?

问题描述

On onLocationChanged event I want to save my GPS route (Latitude , Longitude). Later I want to load this data and draw the route.

Who is the best way to do this, by using some array type (and save or load by using database) or XML files or something else?

Thanks.

解决方案

The best way of storing double values in SharedPreferences without losing precision is:

• Transform to bit representation to store it as long:

  prefsEditor.putLong("Latitude", Double.doubleToLongBits(location.getLatitude()));
  

• To retrieve, transfrom from bit representation to double:

  double latitude = Double.longBitsToDouble(prefs.getLong("Latitude", 0);
  

However, I think that if you want to store a big amount of points is better using a SQLite database than saving each coordinate in a Key-Value pair in SharedPreferences or serialize the array in XML and write it to a file or to SharedPreferences. The database offers you the advantage of loading in memory only the points within the area you are displaying in the map, so you can save memory.

这篇关于在哪里保存 Android GPS(纬度，经度)点?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！