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好的,所以我有一个程序,它采用三位数字并计算每个数字 0-9 在所有输入的数字中出现的次数,并给出每个数字的百分比。出于某种原因,当我输入“111”或“222”之类的数字时,它可以正常工作并将该数字百分比设置为 100%。如果我添加另一个数字,例如“123”,它会将所有百分比返回为零。这是代码:

声明:

private List<PickThreeNumbers> numberList = new ArrayList();
private static int[] timesOccured = {0,0,0,0,0,0,0,0,0,0};
private static double[] percentages = {0,0,0,0,0,0,0,0,0,0};
private static int totalNumbers;
private DecimalFormat dm = new DecimalFormat("0.00");
private static String percentage, timesOccuredString;

这将计算每个数字在数字列表中出现的次数:

    private void calculateTimesOccured(){
    resetAllCalculations();
    for(int i = 0; i < numberList.size();i++){
        for(int r = 1; r <=3; r++){
            for(int b = 0; b <=9; b++){
                if (numberList.get(i).getSingleDigit(r) == b){
                    timesOccured[b]+=1;
                }
            }
        }
    }
}

然后,计算百分比:

private void calculatePercentages(){
    for(int w = 0; w < timesOccured.length; w++){
        totalNumbers+=timesOccured[w];
    }

    for(int e = 0; e < percentages.length; e++){
        percentages[e] = timesOccured[e] / totalNumbers;
        percentages[e]*=100;
    }
}

然后,这会将百分比返回到主要活动:

public String getPercentage(int digit){
    for(int t = 0; t<percentages.length;t++){
        if(digit == t){
            percentage= dm.format(percentages[t]);
        }
    }
    return percentage;
}

最后,这是主活动类中动态生成表格的方法:

percentages.setStretchAllColumns(true);
    percentages.removeAllViews();
    for(int i = 0; i <=9; i++){
        TableRow tr = new TableRow(this);
        TextView digit = new TextView(this);
        TextView timesOccured = new TextView(this);
        TextView percent = new TextView(this);

        digit.setText(String.valueOf(i)+":");
        timesOccured.setText(numbers.getTimesOccuredString(i));
        percent.setText(numbers.getPercentage(i));

        digit.setTextColor(Color.WHITE);
        timesOccured.setTextColor(Color.WHITE);
        percent.setTextColor(Color.WHITE);

        tr.addView(digit);
        tr.addView(timesOccured);
        tr.addView(percent);

        if(i%2 != 0){
            tr.setBackgroundColor(Color.parseColor("#333333"));
        }else{
            tr.setBackgroundColor(Color.parseColor("#444444"));
        }

        percentages.addView(tr);
    }

这是主要活动类中的声明:

TableLayout numbersEntered, percentages, recommendedNumbers;
NumberHandler numbers;

在 OnCreate 方法中使用这个:

 numbersEntered = (TableLayout)findViewById(R.id.enteredNumbersTable);
    percentages = (TableLayout)findViewById(R.id.percentagesTable);
    recommendedNumbers=(TableLayout)findViewById(R.id.recNumbersTable);
    numbers = new NumberHandler();

不管发生什么,如果我输入多个特定数字(即,如果我输入“222”、“222”,它通过将“2”设置为“100%”来工作,但如果我添加任何其他数字,它会将它们全部设置为零。)

有任何想法吗?

4

1 回答 1

1

在 calculatePercentages 中,您需要将被除的数字转换为双精度数。你正在做整数数学,结果要么是 0 要么是 1。

percentages[e] = (double)timesOccured[e] / (double)totalNumbers; 
于 2013-09-07T13:19:27.343 回答