定制微调的项目背景颜色 [英] Customizing spinner's item background color

问题描述

我想提出一个应用程序来计算电阻值，其颜色波段。一切工作正常的纯编程方面。目前，对于selcting我使用的填充颜色列表中的微调色带。

我真的想使它看起来更好。我希望能够在微调设置每个项目的背景颜色给其相应的颜色：

我应该怎么做才达到这一点？这里是我的code的一部分：

Array用于微调：

 ＆LT;字符串数组名=FourBandResistorFullColor＆GT;
    ＆LT;项目＆GT;黑＆LT; /项目＆GT;
    ＆LT;项目＆GT;布朗和LT; /项目＆GT;
    ＆LT;项目＆GT;红色和LT; /项目＆GT;
    ＆LT;项目＆GT;橙色与LT; /项目＆GT;
    ＆LT;项目→黄色＆LT; /项目＆GT;
    ＆LT;项目＆GT;绿色＆LT; /项目＆GT;
    ＆LT;项目＆GT;蓝色＆LT; /项目＆GT;
    ＆LT;项目＆GT;紫＆LT; /项目＆GT;
    ＆LT;项目＆GT;灰色＆LT; /项目＆GT;
    ＆LT;项目＆GT;白色＆LT; /项目＆GT;
  ＆LT; /字符串数组＆GT;
 

在的OnCreate 适配器code方法：

  VAR bandOne = FindViewById＆LT;＆微调GT;（Resource.Id.bandOneColor）;
    VAR bandOneAdapter = ArrayAdapter.CreateFromResource（这一点，Resource.Array.FourBandResistorFullColor，
                                                         Android.Resource.Layout.SimpleSpinnerItem）;
    bandOneAdapter.SetDropDownViewResource（Android.Resource.Layout.SimpleSpinnerDropDownItem）;
    bandOne.Adapter = bandOneAdapter;
    bandOne.ItemSelected + = BandOne_ItemSelected;
 

解决方案

您需要使用自定义适配器。我猜你使用的是ArrayAdapter？如果是这样，你能做到这一点，像这样：

 私有类MyArrayAdapter扩展ArrayAdapter＆LT;串GT; {        公共MyArrayAdapter（上下文的背景下，诠释textViewResourceId）{
            超（背景下，textViewResourceId）;
        }        @覆盖
        公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
            查看查看= super.getView（位置，convertView，父母）;
            INT颜色= getColorFromName（的getItem（位置））;
            view.setBackgroundColor（颜色）;
            返回视图。
        }
    }
 

注意 getColorFromName 是您需要实现自己的功能。它从字符串映射到一个int颜色值（ARGB）。红色为〔实施例是为0xffff0000。

I am making an app to calculate resistor value out of its color bands. Everything works fine on the pure programming side. At the moment for selcting color bands I am using a spinner filled with list of colors.

I really want to make it look better. I want to be able to set background color of each item in the spinner to its corresponding color:

What should I do to achive this? Here is part of my code:

Array used for spinner:

  <string-array name="FourBandResistorFullColor">
    <item>Black</item>
    <item>Brown</item>
    <item>Red</item>
    <item>Orange</item>
    <item>Yellow</item>
    <item>Green</item>
    <item>Blue</item>
    <item>Violet</item>
    <item>Gray</item>
    <item>White</item>    
  </string-array>

Adapter code in OnCreate method:

    var bandOne = FindViewById<Spinner>(Resource.Id.bandOneColor);
    var bandOneAdapter = ArrayAdapter.CreateFromResource(this, Resource.Array.FourBandResistorFullColor,
                                                         Android.Resource.Layout.SimpleSpinnerItem);
    bandOneAdapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
    bandOne.Adapter = bandOneAdapter;
    bandOne.ItemSelected += BandOne_ItemSelected;

解决方案

You need to use a custom adapter. I guess you are using an ArrayAdapter? If so you could do it like so:

    private class MyArrayAdapter extends ArrayAdapter<String>{

        public MyArrayAdapter(Context context, int textViewResourceId) {
            super(context, textViewResourceId); 
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view = super.getView(position, convertView, parent);
            int color = getColorFromName(getItem(position));
            view.setBackgroundColor(color);
            return view;
        }   
    }

Note that getColorFromName is a function you would need to implement yourself. It maps from String to an int color value (ARGB). Red for exmaple would be 0xffff0000.

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