如何在Xamarin Android中修改ListView列表项颜色？附现有代码

Hey there! Let's sort out how to change the ListView item colors in your Xamarin Native Android project. I've got two easy-to-implement methods for you:

Method 1: Use a Custom Layout File #

This is the most straightforward approach if you just need static color changes for your list items.

1. First, create a new layout file named list_item_custom.xml in your Resources/Layout folder. This will define the look of each list item:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/tv_item_text"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="16dp"
    android:textColor="#FF4081" <!-- Replace with your desired text color -->
    android:background="#F5F5F5" <!-- Replace with your desired background color -->
    android:textSize="16sp"/>

2. Update your existing code to use this custom layout instead of the system default SimpleListItem1:

mlistView = FindViewById<ListView>(Resource.Id.lista_clientes);
mItems = new List<string>();
for (int i = 0; i < dt_lista.Rows.Count; i++) {
    mItems.Add(dt_lista.Rows[i][1].ToString());
}
// Use the custom layout and specify the TextView ID where text should be placed
mAdapter = new ArrayAdapter<string>(this, Resource.Layout.list_item_custom, Resource.Id.tv_item_text, mItems);
mlistView.Adapter = mAdapter;

Method 2: Create a Custom ArrayAdapter (For More Flexibility) #

If you need dynamic color changes (like alternating row colors) or plan to add more UI elements later, a custom adapter is the way to go.

1. Create a new class that inherits from ArrayAdapter<string>:

public class CustomListAdapter : ArrayAdapter<string>
{
    private readonly Context _context;
    private readonly List<string> _items;

    public CustomListAdapter(Context context, List<string> items) : base(context, 0, items)
    {
        _context = context;
        _items = items;
    }

    public override View GetView(int position, View convertView, ViewGroup parent)
    {
        // Reuse existing views to improve performance (critical for long lists!)
        View listItem = convertView ?? LayoutInflater.From(_context).Inflate(Android.Resource.Layout.SimpleListItem1, parent, false);
        
        TextView textView = listItem.FindViewById<TextView>(Android.Resource.Id.Text1);
        textView.Text = _items[position];
        
        // Set your desired text and background colors
        textView.SetTextColor(Android.Graphics.Color.ParseColor("#FF4081"));
        // Uncomment below for static background color
        // listItem.SetBackgroundColor(Android.Graphics.Color.ParseColor("#F5F5F5"));
        
        // Example: Alternate row colors for better readability
        if (position % 2 == 0)
        {
            listItem.SetBackgroundColor(Android.Graphics.Color.LightGray);
        }
        else
        {
            listItem.SetBackgroundColor(Android.Graphics.Color.White);
        }
        
        return listItem;
    }
}

2. Swap out your default adapter with this custom one in your Activity code:

mlistView = FindViewById<ListView>(Resource.Id.lista_clientes);
mItems = new List<string>();
for (int i = 0; i < dt_lista.Rows.Count; i++) {
    mItems.Add(dt_lista.Rows[i][1].ToString());
}
mAdapter = new CustomListAdapter(this, mItems);
mlistView.Adapter = mAdapter;

Pro Tip #

For better maintainability, define your colors in the Resources/values/colors.xml file instead of hardcoding hex values. For example:

<color name="primary_text">#FF4081</color>
<color name="light_background">#F5F5F5</color>

Then reference them in code like this:

textView.SetTextColor(Resources.GetColor(Resource.Color.primary_text));
listItem.SetBackgroundColor(Resources.GetColor(Resource.Color.light_background));

内容的提问来源于stack exchange，提问作者Kennyto