禁用listview中的滚动

Question

我有一个列表视图，根据一些逻辑，我想临时禁用滚动。 view.setOnScrollListener（NULL）; 没有帮助我我想我需要写一些代码，有人可以给我一个文件或一些片段吗？

谢谢

Answer 1

另一个没有创建新自定义ListView的选项是将onTouchListener附加到ListView，如果运动事件操作是ACTION_MOVE ，则在onTouch()回调中返回true。

listView.setOnTouchListener(new OnTouchListener() {

    public boolean onTouch(View v, MotionEvent event) {
        return (event.getAction() == MotionEvent.ACTION_MOVE);
    }
});

Answer 2

在CustomListView中：

@Override
public boolean dispatchTouchEvent(MotionEvent ev){
   if(ev.getAction()==MotionEvent.ACTION_MOVE)
      return true;
   return super.dispatchTouchEvent(ev);
}

然后ListView将对点击作出反应，但不会改变滚动位置。

Answer 3

使用listview.setEnabled（false）禁用listview滚动

注意：这也会禁用行选择

Answer 4

如果您有一个绑定到列表项的事件，则使用任何这些解决方案拖动列表仍将触发该事件。 您希望使用以下方法来考虑用户期望通过拖离所选项目来取消事件（改编自Pointer Null的答案）：

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    final int actionMasked = ev.getActionMasked() & MotionEvent.ACTION_MASK;

    if (actionMasked == MotionEvent.ACTION_DOWN) {
        // Record the position the list the touch landed on
        mPosition = pointToPosition((int) ev.getX(), (int) ev.getY());
        return super.dispatchTouchEvent(ev);
    }

    if (actionMasked == MotionEvent.ACTION_MOVE) {
        // Ignore move events
        return true;
    }

    if (actionMasked == MotionEvent.ACTION_UP) {
        // Check if we are still within the same view
        if (pointToPosition((int) ev.getX(), (int) ev.getY()) == mPosition) {
            super.dispatchTouchEvent(ev);
        } else {
            // Clear pressed state, cancel the action
            setPressed(false);
            invalidate();
            return true;
        }
    }

    return super.dispatchTouchEvent(ev);
}

提供完整的自定义视图类： https ： //gist.github.com/danosipov/6498490

Answer 5

制作您的CustomListView

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
  if(needToStop){
    return false;}
    return super.onInterceptTouchEvent(ev); 
}

如果false ，孩子们将处理触摸事件，请确保将if condition为检查是否需要滚动。

Answer 6

对我来说最好的答案是丹·奥西波夫的一个人。 我会像这样改进它。 （触发CANCEL动作事件而不是手动擦除按下状态）。

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    final int actionMasked = ev.getActionMasked() & MotionEvent.ACTION_MASK;

    if (actionMasked == MotionEvent.ACTION_DOWN) {
        // Record the position the list the touch landed on
        mPosition = pointToPosition((int) ev.getX(), (int) ev.getY());
        return super.dispatchTouchEvent(ev);
    }

    if (actionMasked == MotionEvent.ACTION_MOVE) {
        // Ignore move events
        return true;
    }

    if (actionMasked == MotionEvent.ACTION_UP) {
        // Check if we are still within the same view
        if (pointToPosition((int) ev.getX(), (int) ev.getY()) != mPosition) {
            // Clear pressed state, cancel the action
            ev.setAction(MotionEvent.ACTION_CANCEL);
        }
    }

    return super.dispatchTouchEvent(ev);
}

Answer 7

在列表视图上编写用于滑动删除的代码时，我想在检测到滑动后阻止垂直滚动。 一旦满足滑动删除条件，我在ACTION_MOVE部分设置了一个布尔标志。 dispatchTouchEvent方法检查该条件并阻止滚动工作。 在ACTION_UP中，我将标志设置为false以重新启用滚动。

private float mY = Float.NaN;
private boolean mStopScroll = false;

@Override
public boolean onTouch(View view, MotionEvent event) {

   if(!mStopScroll) {
       mY = event.getY();
   }

   switch (event.getAction()) {

        case MotionEvent.ACTION_MOVE:

            if(<condition that stops the vertical scroll>) {
                mStopScroll = true;
            }

            break;

        case MotionEvent.ACTION_UP:

            mStopScroll = false;

            // your code here
            return true;

        default:

    }

    return false;

}

@Override
public boolean dispatchTouchEvent(MotionEvent motionEvent) {

    if(mStopScroll) {
        motionEvent.setLocation(motionEvent.getX(), mY);
    }
    return super.dispatchTouchEvent(motionEvent);
}

Answer 8

我对Xamarin和MvvmCross用户的回答很有意思。 主要概念与之前的帖子相同，因此主要步骤如下：

1. 静音滚动事件
2. 动态更改列表高度

这里是helper类，允许在列表视图中禁用滚动：

using System;
using Cirrious.MvvmCross.Binding.Droid.Views;
using Android.Content;
using Android.Util;
using Android.Views;
using Android.Database;

namespace MyProject.Android.Helpers
{
    public class UnscrollableMvxListView
        : MvxListView
    {
        private MyObserver _myObserver;

        public UnscrollableMvxListView (Context context, IAttributeSet attrs, MvxAdapter adapter)
            : base(context, attrs, adapter)
        {
        }

        protected override void OnAttachedToWindow ()
        {
            base.OnAttachedToWindow ();
            var dtso = new MyObserver(this);
            _myObserver = dtso;
            Adapter.RegisterDataSetObserver (dtso);
        }

        protected override void OnDetachedFromWindow ()
        {
            Log.Debug ("UnscrollableMvxListView", "OnDetachedFromWindow");
            if (_myObserver != null) {
                Adapter.UnregisterDataSetObserver (_myObserver);
                _myObserver = null;
            }
            base.OnDetachedFromWindow ();
        }

        //Make List Unscrollable
        private int _position;
        public override bool DispatchTouchEvent (MotionEvent ev)
        {
            MotionEventActions actionMasked = ev.ActionMasked & MotionEventActions.Mask;

            if (actionMasked == MotionEventActions.Down) {
                // Record the position the list the touch landed on
                _position = PointToPosition((int) ev.GetX (), (int) ev.GetY());
                return base.DispatchTouchEvent(ev);
            }

            if (actionMasked == MotionEventActions.Move) {
                // Ignore move events
                return true;
            }

            if (actionMasked == MotionEventActions.Up) {
                // Check if we are still within the same view
                if (PointToPosition((int) ev.GetX(), (int) ev.GetY()) == _position) {
                    base.DispatchTouchEvent(ev);
                } else {
                    // Clear pressed state, cancel the action
                    Pressed = false;
                    Invalidate();
                    return true;
                }
            }

            return base.DispatchTouchEvent(ev);
        }

        //Make List Flat
        public void JustifyListViewHeightBasedOnChildren () {
            if (Adapter == null) {
                return;
            }
            var vg = this as ViewGroup;
            int totalHeight = 0;
            for (int i = 0; i < Adapter.Count; i++) {
                View listItem = Adapter.GetView(i, null, vg);
                listItem.Measure(0, 0);
                totalHeight += listItem.MeasuredHeight;
            }

            ViewGroup.LayoutParams par = LayoutParameters;
            par.Height = totalHeight + (DividerHeight * (Adapter.Count - 1));
            LayoutParameters = par;
            RequestLayout();
        }
    }

    internal class MyObserver
        : DataSetObserver 
    {
        private readonly UnscrollableMvxListView _unscrollableMvxListView;

        public MyObserver (UnscrollableMvxListView lst)
        {
            _unscrollableMvxListView = lst;
        }

        public override void OnChanged() {
            Log.Debug("UnscrollableMvxListView", "OnChanged");
            base.OnChanged ();
            _unscrollableMvxListView.JustifyListViewHeightBasedOnChildren ();
        }
    }
}

Answer 9

这是在http://danosipov.com/?p=604上指出的代码Joe Blow（对OP帖子的评论）但是我在这里发布它以保护它以防链接被孤立：

public class ScrollDisabledListView extends ListView {

private int mPosition;

public ScrollDisabledListView(Context context) {
    super(context);
}

public ScrollDisabledListView(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public ScrollDisabledListView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    final int actionMasked = ev.getActionMasked() & MotionEvent.ACTION_MASK;

    if (actionMasked == MotionEvent.ACTION_DOWN) {
        // Record the position the list the touch landed on
        mPosition = pointToPosition((int) ev.getX(), (int) ev.getY());
        return super.dispatchTouchEvent(ev);
    }

    if (actionMasked == MotionEvent.ACTION_MOVE) {
        // Ignore move events
        return true;
    }

    if (actionMasked == MotionEvent.ACTION_UP) {
        // Check if we are still within the same view
        if (pointToPosition((int) ev.getX(), (int) ev.getY()) == mPosition) {
            super.dispatchTouchEvent(ev);
        } else {
            // Clear pressed state, cancel the action
            setPressed(false);
            invalidate();
            return true;
        }
    }

    return super.dispatchTouchEvent(ev);
}
}

将此ListView添加到布局时，请记住在其前面加上其包名，否则在尝试对其进行充气时将引发异常。

Answer 10

试试这个：

listViewObject.setTranscriptMode(0);

适合我。