Question

在我的xamarin Android项目的微调器中，我想将clickable设置为false，但仍然通过OnTouchListener检测点击次数。这样我就可以抑制出现的项目列表，除非用户点击微调器视图的特定部分。这种方法在KitKat和更低版本中完美运行，但在Lollipop和更高版本中，可点击设置似乎没有效果，并且微调器总是在单击时显示项目列表。有没有人知道我如何在Lollipop中获得一个微调器，之后在点击时不显示项目列表但仍然响应点击事件？

以下是我的测试项目中的代码。

布局xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<Spinner android:id="@+id/testSpinner"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginBottom ="10sp"/>
</LinearLayout>

活动代码：

public class MainActivity : Activity
{
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);

        SetContentView(Resource.Layout.Main);

        Spinner spinner = FindViewById<Spinner>(Resource.Id.testSpinner);


        List<string> items = new List<string>() { "Dave", "Ben", "Dan" };

        spinner.Clickable = false;

        ConnectArrayAdapter adapter = new ConnectArrayAdapter(this, spinner, items);
        spinner.Adapter = adapter;

    }
}

来自阵列适配器的相关代码位（我只希望在用户点击视图中的图像时显示这些项目）：

  public override View GetView(int position, View convertView, ViewGroup parent)
    {
        View view = base.GetView(position, convertView, parent);

        TextView textView = (TextView)view;

        textView.SetTextColor(Android.Graphics.Color.Black);
        textView.SetTextSize(Android.Util.ComplexUnitType.Dip, 16);
        textView.Gravity = TextGravity;

        textView.SetCompoundDrawablesWithIntrinsicBounds(null, null, m_image, null);

        textView.SetOnTouchListener(new SelectImageTouchListener(textView, m_parent));
        m_parent.Clickable = false;

        return view;
    }

    private class SelectImageTouchListener : RightDrawableOnTouchListener
    {
        private Spinner m_spinner;
        public SelectImageTouchListener(TextView view, Spinner spinner) : base(view)
        {
            m_spinner = spinner;
        }

        public override bool OnDrawableTouch(MotionEvent e)
        {
            m_spinner.PerformClick();

            e.Action = MotionEventActions.Cancel;
            return false;
        }
    }

 public abstract class RightDrawableOnTouchListener : Java.Lang.Object,   View.IOnTouchListener
{
    private Drawable m_drawable;
    private int m_fuzz = 10;

    public RightDrawableOnTouchListener(TextView view) : base()
    {
        List<Drawable> drawables = view.GetCompoundDrawables().ToList();
        if (drawables != null && drawables.Count == 4)
            m_drawable = drawables[2];
    }

    public new IntPtr Handle
    {
        get
        {
            return base.Handle;
        }
    }

    public new void Dispose()
    {
        base.Dispose();
    }

    public bool OnTouch(View v, MotionEvent e)
    {
        if (e.Action == MotionEventActions.Down && m_drawable != null)
        {
            int x = (int)e.GetX();
            int y = (int)e.GetY();
            Rect bounds = m_drawable.Bounds;

            if (x >= (v.Right - bounds.Width() - m_fuzz) && x <= (v.Right - v.PaddingRight + m_fuzz)
                && y >= (v.PaddingTop - m_fuzz) && y <= (v.Height - v.PaddingBottom) + m_fuzz)
            {
                return OnDrawableTouch(e);
            }
        }
        return false;
    }

    public abstract bool OnDrawableTouch(MotionEvent e);
}

Android微调器可点击在Lollipop及更高版本中无效

0 个答案: