java - 如何将整数值分配给 String 元素的 ArrayList？

Question

我有一个ArrayList用户在 MainActivity 中输入的字符串元素的数量我的应用程序(Android Studio)的。它被称为ArrayList<String> serviceNames 。服务名称可以是 Facebook、健身应用程序、时钟应用程序等任何名称。我想为每个服务的用户输入分配一个整数值，因为我正在开发与群体粒子算法相关的健身函数。

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)加上用户在主要 Activity 中输入的服务数量。因此，如果他们输入 4 个服务，则总共 6 个维度。然后我想为这些服务分配一个“int”值，如下所示...

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

完成后，我想将其传递到 getGoodness()函数会将这些值作为维度中的位，因此 Facebook 将是维度中的第三位。任何帮助或建议都会很棒，我是一名大学生，将这个项目作为一个项目进行。

编辑:我现在已经在 getGoodness() 函数中实现了 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，分配给它们的整数值从 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 UI Activity 的数组列表，它从每个服务的 0 到 100 之间获取实用程序(优先级)成本。这称为 costUtilities，我希望包含 80.0-100.0( double )效用的位在未打开时返回 -2000 的值。如果您能对此提供帮助，那就太好了，如果不能，感谢您迄今为止所提供的帮助，并祝我在 PSO 的最后一年个人项目中好运:)

Answer 1

正如我在评论中所说，您可以使用 java.util.hashmap为此。

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

或者，如果您已将服务作为数组列表serviceNames，那么您可以将其放在后面:

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); 
}