使用距用户位置的距离排序

Question

我有一个像城市目录一样的Android应用程序，显示排序为Last Updated First的结果..我想将其更改为按用户位置的距离排序。 新的，需要帮助指向正确的方向...

Answer 1

请在用户模型类

上使用波纹管分类机制

Collections.sort（cityList，new Comparator（）{

public int compare(City obj1, City obj2) {

    // cityList --> ArrayList<City>
    // obj1, obj2 are City objects and having location 
    // mLocation is user location 

    Location patent1 = new Location("hardcoded position");
    patent1.setLatitude(obj1.getLatitude());
    patent1.setLongitude(obj1.getLongitude());

    Location patent2 = new Location("hardcoded position");
    patent2.setLatitude(obj2.getLatitude());
    patent2.setLongitude(obj2.getLongitude());

    return mLocation.distanceTo(patent1) > mLocation.distanceTo(patent2) ? 1
            : mLocation.distanceTo(patent1) < mLocation.distanceTo(patent2) ? -1
            : 0;

}

}）;