Question

我正在尝试显示一个信息列表，我想为ListView中的每个项目/行提供不同的背景颜色。我可以改变每一行的背景颜色，但不能改变每一行的颜色。我尝试使用多个非嵌套的if语句来设置背景颜色，但我不起作用。

public View getView(int position, View convertView, ViewGroup parent) 
    {
        ViewGroup listItem;
        if(convertView == null)
        {
            listItem = (ViewGroup) getLayoutInflator().inflate(R.layout.list_item, null);
        }
        else
        {
            listItem = (ViewGroup) convertView;
        }

        //listItem.setClickable(true);
        //listItem.setOnClickListener(ViewBeerCL);
        listItem.setTag(getParent());
        String[] gradeInfo = gradeList.get(position).split(":");
        TextView gradeTV = (TextView) listItem.findViewById(R.id.gradeTV);
        TextView highGradeTV = (TextView) listItem.findViewById(R.id.highGradeTV);
        TextView lowGradeTV = (TextView) listItem.findViewById(R.id.lowGradeTV);

        String GradeLayoutStyle = gradeInfo[0];
        String aStr = gradeList.get(position).substring(1, 1);
        String bStr = "A";

        gradeTV.setText(gradeInfo[0]);
        highGradeTV.setText(gradeInfo[1]);
        lowGradeTV.setText(gradeInfo[2]);
        gradeTV.setBackgroundColor((gradeInfo[0] == bStr)? Color.TRANSPARENT:getResources().getColor(R.color.GradeA));
        highGradeTV.setBackgroundColor((gradeInfo[0] == bStr)? Color.TRANSPARENT:getResources().getColor(R.color.GradeA));
        lowGradeTV.setBackgroundColor((gradeInfo[0] == bStr)? Color.TRANSPARENT:getResources().getColor(R.color.GradeA));

        if(gradeTV.getText() == bStr)
        {
            SetColor(gradeTV, highGradeTV, lowGradeTV, getResources().getColor(R.color.GradeA), gradeInfo, "A");
        }
        if(GradeLayoutStyle == "B")
        {
            SetColor(gradeTV, highGradeTV, lowGradeTV, getResources().getColor(R.color.GradeB), gradeInfo, "B");
        }
        if(GradeLayoutStyle == "C")
        {
            SetColor(gradeTV, highGradeTV, lowGradeTV, getResources().getColor(R.color.GradeC), gradeInfo, "C");
        }
        if(GradeLayoutStyle == "D")
        {
            SetColor(gradeTV, highGradeTV, lowGradeTV, getResources().getColor(R.color.GradeD), gradeInfo, "D");
        }
        if(GradeLayoutStyle == "F")
        {
            SetColor(gradeTV, highGradeTV, lowGradeTV, getResources().getColor(R.color.GradeF), gradeInfo, "F");
        }

        return listItem;
    }

    private void SetColor(TextView grade, TextView high, TextView low, int color, String[] gradeInfo, String letter)
    {
        grade.setBackgroundColor((gradeInfo[0] == letter)? Color.TRANSPARENT:color);
        high.setBackgroundColor((gradeInfo[0] == letter)? Color.TRANSPARENT:color);
        low.setBackgroundColor((gradeInfo[0] == letter)? Color.TRANSPARENT:color);
    }

是的，这是为了完成家庭作业，我不是在寻找有人为我做这项工作，我正在寻找帮助/告诉我如何解决这个问题的人。如果有人能指出我正确的方向，或者让我知道这是否可能，那就太棒了！

谢谢，

肖恩

Answer 1

需要使用string.eqals（otherString）进行字符串比较。使用==将无法工作，因为它比较对象本身，而不是内容。

Android ListView背景颜色变化取决于值（逻辑）未定位或选择

1 个答案: