Android 您如何衡量条形图的 4 个类别

我会感谢你的 comments ，但这是最终奏效的方法:

    package com.functionality.mylifehelper.drawerUI.ui.expenditure;

import java.util.ArrayList;
import java.util.List;

public class ExpensesManager {
List<Bill> bills;
Earning obj;

/**
 * Prices
 */
int allPrices;

int pricesForGroceries;
int pricesForLoansEtc;
int pricesForTripsEtc;
int pricesForShopping;

int percentageGroceries;
int percentageLoans;
int percentageTrips;
int percentageShopping;

int total = 100;
List<Bill> TYPE_1, TYPE_2, TYPE_3, TYPE_4;
ExpensesManager(List<Bill> expenses, Earning earning) {
    bills=expenses;
    obj=earning;
    calculateCost();
}

public List<Bill> getBills() {
    return bills;
}

public Earning getObj() {
    return obj;
}

public int getAllPrices() {
    return allPrices;
}

public int getPricesForGroceries() {
    return pricesForGroceries;
}

public int getPricesForLoansEtc() {
    return pricesForLoansEtc;
}

public int getPricesForTripsEtc() {
    return pricesForTripsEtc;
}

public int getPricesForShopping() {
    return pricesForShopping;
}

public int getPercentageGroceries() {
    return percentageGroceries;
}

public int getPercentageLoans() {
    return percentageLoans;
}

public int getPercentageTrips() {
    return percentageTrips;
}

public int getPercentageShopping() {
    return percentageShopping;
}

public int getTotal() {
    return total;
}

public List<Bill> getTYPE_1() {
    return TYPE_1;
}

public List<Bill> getTYPE_2() {
    return TYPE_2;
}

public List<Bill> getTYPE_3() {
    return TYPE_3;
}

public List<Bill> getTYPE_4() {
    return TYPE_4;
}

private void calculateCost() {
    List<Bill> groceries = new ArrayList<>(), loans = new ArrayList<>(), trips
            = new ArrayList<>(), shopping = new ArrayList<>();
    for(Bill bill : bills) {
        if(bill.getType().equals(Bill.food)) {
            groceries.add(bill);
            pricesForGroceries += bill.getAmount();
        } else if(bill.getType().equals(Bill.loans)) {
            pricesForLoansEtc += bill.getAmount();
            loans.add(bill);
        } else if(bill.getType().equals(Bill.shopping)) {
            pricesForShopping += bill.getAmount();
            shopping.add(bill);
        } else {
            pricesForTripsEtc += bill.getAmount();
            trips.add(bill);
        }
    }
    TYPE_1 = groceries;
    TYPE_2 = loans;
    TYPE_3 = trips;
    TYPE_4 = shopping;

    total = bills.size();

    // tasks : 10

    // say there are 90 tasks
    // for e.g only - >
    // NOW, YOU SAY THAT 50 are groceries, 10 loans etc
    //
    // groceries = 90 / 50 = 45.000 something
    try {
        percentageGroceries = total / TYPE_1.size();
    } catch(Exception e) {
        percentageGroceries = 0;
    }
    try {
        percentageLoans = total / TYPE_2.size();
    } catch(Exception e) {
        percentageLoans = 0;
    }
    try {
        percentageShopping = total / TYPE_4.size();
    } catch(Exception e) {
        percentageShopping = 0;
    }
    try {
        percentageTrips = total / TYPE_3.size();
    } catch(Exception e) {
        percentageTrips = 0;
    }
}

public int getAllItemsCost() {
    return pricesForGroceries+pricesForTripsEtc+pricesForShopping+pricesForLoansEtc;
}

}

谢谢你的建议，@TheLibrary，但我在你之前就知道了，:)我要结束了，别忘了为你自己投票并使用它.