如何将整数值分配给 String 元素的 ArrayList?

How to assign an integer value to an ArrayList of String elements?

我有一个 ArrayList 字符串元素,用户在我的应用程序 (Android Studio) 的 MainActivity 中输入这些元素。它被称为ArrayList<String>serviceNames。服务名称可以是 Facebook、Fitness App、Clock App 等任何名称。我想为这些服务的每个用户输入分配一个整数值,因为我正在研究与 Swarm Particle 算法相关的健身功能。

public class CustomServiceSelection implements Goodness {

    public static final int numOfServices = MainActivity.servicenames.size();
    public static final int NUM_DIMENSIONS = 2 + numOfServices;
    public static final int DATA = 0;
    public static final int WLAN = 1; //get the names of the services from the arraylist
    //then convert them into an integer for the bits/no_dimensions


    boolean alwaysOn = MainActivity.costUTILITY.contains(100.0);


    ArrayList<String> serviceNames = MainActivity.servicenames;
    ArrayList<Double> costData = MainActivity.costDATA;
    ArrayList<Double> costWlan = MainActivity.costWLAN;
    ArrayList<Double> costUtilities = MainActivity.costUTILITY;
    private double batteryCost;
    //ArrayList<Double> battery = MainActivity.costBattery;

    public CustomServiceSelection(double batteryCost, ArrayList<Double> costData, ArrayList<Double> costWlan,
                                  ArrayList<Double> costUtilities) {
        if (costUtilities == null || costUtilities.size() < 1 || costData.size() < 1 || costWlan.size() < 1) {
            throw new RuntimeException("Please add atleast 1 cost to Data, WLAN and Utility");
        }
        this.batteryCost = batteryCost; //make sure you add battery field to UI, user enters battery level
        this.costData = costData;
        this.costWlan = costWlan;
        this.costUtilities = costUtilities;
        //this.services = services;
    }

    public double getGoodness(boolean[] bits) {
        double utility = 0.0;
        double rcost = 0.0;
        ArrayList<Double> resourceCost = new ArrayList<Double>();

        for(Double i : costData){

        }

        for (int x = 0; x <= NUM_DIMENSIONS; x++) { //for each resource that is a bit
            if (bits[x] == alwaysOn) {  //if a utility cost of a service is 100, return -2000.0
                return -2000;
            }

            if (bits[DATA] && bits[WLAN]) {
                return -500;
            }
            if (!bits[DATA] || bits[WLAN]) {
                return -450; //particle goodness always returns this??
            }
            if (bits[DATA]) {
                resourceCost = costData;
            } else if (bits[WLAN]) {
                resourceCost = costWlan;
            }

            for (int i = 0; i <= NUM_DIMENSIONS; i++) { //for each service the user enters
                if (bits[i]) {
                    utility += costUtilities.get(i);
                    rcost += resourceCost.get(i);
                }
            }
            if (rcost < batteryCost) {
                return utility;
            }


        }
        return utility * 0.50;
    }
    }

我希望 num_dimensions 为 2(WLAN 和数据)加上用户在主 activity 中输入的服务数量。所以如果他们输入 4 个服务,那么 6 个维度 altogether.Then 我想像这样为这些服务分配一个 'int' 值...

   public static final int Facebook = 2;
   public static final int Twitter = 3;
   public static final int ClockApp = 4;

完成后,我想将其传递给 getGoodness() 函数,该函数会将这些值作为维度数中的位,因此 Facebook 将成为维度中的第 3 位。任何帮助或建议都会很棒,我是一名大学生,将此作为一个项目进行。

编辑:我现在已经在 getGoodness() 函数中实现了一个 hashmap。我的代码现在看起来像这样...

    public double getGoodness(boolean[] bits) {
    double utility = 0.0;
    double rcost = 0.0;
    ArrayList<Double> resourceCost = new ArrayList<Double>();

    for(int i = 2; i <= NUM_DIMENSIONS; i++) { //hashmap that stores the   service names with an int value
        for(int k = 0; k <= numOfServices; k++) {
            serviceMap.put(i, serviceNames.get(k));
        }

我需要 NUM_DIMENSIONS 的前 2 位是 WLAN 和 DATA。因此,对于用户输入的每个服务,分配给他们的整数值从 2 开始增加 1。所以...(2,Facebook),(3,Twitter),(4,Uber)等。现在我的下一个问题是,将这些传递给 getGoodness() 函数,我有一个来自主要 UI activity 的数组列表,它从每项服务的 0-100 中获取实用程序(优先级)成本。这称为 costUtilities,我希望包含 80.0-100.0(双)效用的位到 return 如果未打开,我的值为 -2000。如果你能帮助解决这个问题,那就太好了,如果不能,感谢你迄今为止提供的帮助,祝我在最后一年的 PSO 个人项目中好运 :)

正如我在评论中所说,您可以为此使用 java.util.hashmap

HashMap<int,String> serviceMap = new HashMap<int,String>
//for adding values to a hashmap
serviceMap.put(3,"facebook");

或者如果你已经将服务作为数组列表serviceNames那么你可以把它放在后面:

HashMap<int,String> serviceMap = new HashMap<int,String>
for(String serviceName : serviceNames) {
    // you need to replace serviceIntValue with the actual int value of the service
    serviceMap.put(serviceIntValue,serviceName); 
}

拉惹回答正确。您还可以创建一个 JSON 对象,并插入您想要的标签,然后将其包含在 hashMap 中。

JSON 示例:

public static JSONObject constructEHRJSON(int sessionID, String EHR) {
  {
    JSONObject JSONobj = new JSONObject();


    try {

        JSONobj.put("1", sessionID);
        JSONobj.put("2", EHR);
    } catch (JSONException e) {
        /
    }
    return JSONobj;

}