我有一个列表视图，根据某些逻辑我想暂时禁用滚动。 view.setOnScrollListener(null);对我没有帮助，我想我需要编写一些代码，有人可以给我一个历史记录或一些片段吗？
谢谢
在您的自定义列表视图中：
@Override
public boolean dispatchTouchEvent(MotionEvent ev){
if(ev.getAction()==MotionEvent.ACTION_MOVE)
return true;
return super.dispatchTouchEvent(ev);
}
然后 ListView 将对点击做出反应，但不会改变滚动位置。
无需创建新的自定义 ListView 的另一个选项是将
onTouchListeneronTouch()ACTION_MOVElistView.setOnTouchListener(new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
return (event.getAction() == MotionEvent.ACTION_MOVE);
}
});
使用 listview.setEnabled(false) 禁用列表视图滚动
注意：这也会禁用行选择
让你的
CustomListView@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if(needToStop){
return false;}
return super.onInterceptTouchEvent(ev);
}
在
falseif condition如果您有一个事件绑定到列表项，那么使用任何这些解决方案拖动列表仍然会触发该事件。您希望使用以下方法来满足用户通过拖动所选项目来取消事件的期望（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
对我来说最好的答案是 Dan Osipov 的答案。 我会像这样改进它。 （触发取消操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);
}
在编写用于在列表视图上滑动删除的代码时，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，我就会在 ACTION_MOVE 部分设置一个布尔标志。 dispatchTouchEvent 方法检查该条件并阻止滚动工作。在 ACTION_UP 中，我将标志设置回 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);
}
我的回答对于 Xamarin 和 MvvmCross 用户来说会很有趣。主要概念与之前的文章相同，因此主要步骤是：
这里是辅助类，它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 ();
}
}
}
这是 Joe Blow（对 OP 帖子的评论）在 http://danosipov.com/?p=604 上指出的代码，但我将其发布在这里以保留它，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);
}
}
当您将此 ListView 添加到布局中时，请记住在其前面添加其包名称，否则当您尝试膨胀它时会抛出异常。
试试这个：
listViewObject.setTranscriptMode(0);
对我有用。
将 listView 放入nestedScrollView 并使用以下选项之一禁用滚动：
yourListView.stopNestedScroll()
yourListView.isNestedScrollingEnabled = false
yourListView.transcriptMode = 0
android:descendantFocusability="blocksDescendants"
android:nestedScrollingEnabled="false"
注意：使用以下选项之一就足够了。 注意：只有将 listView 放入nestedScrollView 中时，此方法才有效。如果您不希望 listView 位于nestedScrollView 内部并且仍想禁用滚动，那么您需要按照接受的答案中的建议创建 CustomListView。