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我有一个使用 swarm 粒子算法优化移动资源的 Android Studio 项目。我的健身功能不断出现此错误，因此我的主要活动从未运行或向我显示结果。这是我的课，我一直遇到问题...

public class CustomService implements Goodness {


public static int numOfServices = MainActivity.servicenames.size();
public static final int NUM_DIMENSIONS = 1 + numOfServices;
public static HashMap<String, Integer> serviceMap = new HashMap<String, Integer>(); //hashmap to store values
ArrayList<String> serviceNames = MainActivity.servicenames;
ArrayList<Double> costData = MainActivity.costDATA;
ArrayList<Double> costWlan = MainActivity.costWLAN;
ArrayList<Double> costUtilities = MainActivity.costUTILITY;
double batteryCost;

public void setBatteryCost(double batteryCost) {
    this.batteryCost = batteryCost;
}

public CustomService(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;
}


public double getGoodness(boolean[] bits) {
    double utility = 0.0;
    double rcost = 0.0;
    ArrayList<Double> resourceCost = new ArrayList<Double>();
    Collections.sort(costUtilities);
    double maxValue = Collections.max(costUtilities);
    int NumOfDimensions = serviceMap.size();
    serviceMap.put("DATA", 0);
    serviceMap.put("WLAN", 1);
    int data = serviceMap.get("DATA");
    int wlan = serviceMap.get("WLAN");
    for (int i = 2; i <= NumOfDimensions; i++) { //hashmap that stores the service names with a bit value i
        for (int k = 0; k < numOfServices; k++) {
            serviceMap.put(serviceNames.get(k), i); //if i = 2, k = 1, put(2, Facebook), put(3, Twitter)
        }

        if (bits[data] && bits[wlan]) {
            return -500;
        }
        if (!bits[data] || bits[wlan]) {
            return -1000; //particle goodness always returns this??
        }
        if (bits[data]) {
            resourceCost = costData;
        } else if (bits[wlan]) {
            resourceCost = costWlan;
        }


        for (int n = 2; n <= numOfServices; n++) {
            if (bits[serviceMap.get(n)]) {
                utility += costUtilities.get(n - 1);
                rcost += resourceCost.get(n - 1);
            }
        }
        if (rcost < batteryCost) {
            return utility;
        }
    }
        return utility * 0.50;
    }

}

基本上，我实现了一个 hashmap，它从主要活动中获取用户输入，并为这些输入分配一个 int 值，该值用作 bits[] 数组中的位。这些是我的错误...

Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
                  at test_classes.CustomService.getGoodness(CustomService.java:60)
                  at bpso.BinaryPso.optimize(BinaryPso.java:45)
                  at android_tests.CustomUseCase.test(CustomUseCase.java:56)
                  at ai69.psoui.ParticleActivity.runTest(ParticleActivity.java:108)
                  at ai69.psoui.ParticleActivity$runTests.doInBackground(ParticleActivity.java:59)
                  at ai69.psoui.ParticleActivity$runTests.doInBackground(ParticleActivity.java:56)
                  at android.os.AsyncTask$2.call(AsyncTask.java:295)
                  at java.util.concurrent.FutureTask.run(FutureTask.java:237)
                  at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
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1 回答 1

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在我看来，您想将bits数组用作输入/输出参数。但是，您不能在创建后更改数组的大小。所以你有几个选择：

1）确保数组的大小与serviceNames传入时的大小相同。

2）使用可以调整大小的对象（如 aBitSet或List<Boolean>）而不是数组。

3) 在内部创建数组getGoodness并返回一个复合值，其中double和创建的bits数组作为 的返回值getGoodness。

于 2017-04-10T11:01:56.040 回答