错误解析XML错误在自定义视图中Android的Xamarin

Question

在这里，我已经延长从View类TransparentCircleView类，但我无法使用该视图在.axml文件。给错误错误解析XML：没有很好地形成（标记无效）FieldStar.Droid E：\项目\ FieldStar \ FieldStar.Droid \资源\布局\ activity_home.axml 44

透明圈View.ca

namespace FieldStar.Droid.Views
{

[Register("FieldStar/Droid/Views/TransparentCircleView")]
public class TransparentCircleView : View
{
    private readonly string DEFAULT_BACKGROUND_COLOR = "#ffffff";
    private readonly string DEFAULT_FOREGROUND_COLOR = "#000000";
    private Paint _backgroundPaint, _foregroundPaint;
    public TransparentCircleView(Context context) : base(context)

    {
        Init();
    }

    public TransparentCircleView(Context context, IAttributeSet attrs) : base(context, attrs)
    {
        Init();
    }

    public TransparentCircleView(Context context, IAttributeSet attrs, int defStyleAttr) : base(context, attrs, defStyleAttr)
    {
        Init();
    }

    public TransparentCircleView(Context context, IAttributeSet attrs, int defStyleAttr, int defStyleRes) : base(context, attrs, defStyleAttr, defStyleRes)
    {
        Init();

    }

    protected TransparentCircleView(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer)
    {

    }

    protected override void OnDraw(Canvas canvas)
    {
        base.OnDraw(canvas);
        int radius = -1;
        if (Width < Height)
        {
            radius = (Width - PaddingLeft - PaddingRight) / 2;
        }
        else
        {
            radius = (Height - PaddingTop - PaddingBottom) / 2;
        }

        //Background Circle
        canvas.DrawRect(0, 0, Width, Height, _backgroundPaint);

        //Foreground Circle
        canvas.DrawCircle(Width / 2, Height / 2, radius,_foregroundPaint);
    }

    private void Init()
    {
        _backgroundPaint = new Paint();
        _backgroundPaint.AntiAlias = true;
        _backgroundPaint.SetStyle(Paint.Style.Fill);
        _backgroundPaint.Color = Color.ParseColor(DEFAULT_BACKGROUND_COLOR);

        //Foreground View
        _foregroundPaint = new Paint();
        _foregroundPaint.AntiAlias = true;
        _foregroundPaint.SetStyle(Paint.Style.Fill);
        _foregroundPaint.Color = Resources.GetColor(Android.Resource.Color.Transparent);
    }

    public void SetBackgroundColor(string color)
    {
        _backgroundPaint.Color = Color.ParseColor(color);
        Invalidate();
    }

    public void SetForegroundColor(string color)
    {
        _foregroundPaint.Color = Color.ParseColor(color);
        Invalidate();
    }
}

}

Answer 1

这个错误的最常见原因是没有保证的命名空间路径组件是小写。你说，错误返回的事实是“错误错误解析XML：没有很好地形成（标记无效）FieldStar.Droid”往往指向这个作为的问题。请确保您在XML引用组件，如下所示：

<fieldStar.droid.views.TransparentCircleView
.....
.....
/>