ListView 行内的 ViewPager 防止 onItemClick 被触发

时间：2023-10-04

本文介绍了ListView 行内的 ViewPager 防止 onItemClick 被触发的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！

问题描述

我在 ListView 的每一行中都有一个 ViewPager.它工作正常，当用户使用滑动手势时它会更改其中的视图，但它会阻止调用 ListView 的 onItemClick 方法.我知道 ViewPager 是罪魁祸首，因为当我隐藏它时，会调用 onItemClick，所以这就是我正在尝试的:

我创建了一个 ViewGroup 作为行 (RowView).此 ViewGroup 已重写 onInterceptTouchEvent 以避免 ViewPager 在我检测到点击时处理进一步的触摸事件.但是仍然没有调用 onItemClick 回调.并且列表选择器在单击时也不显示.我希望这两个功能起作用.

这是来自 RowView 的 onInterceptTouchEvent 的样子:

@Override公共布尔 onInterceptTouchEvent(MotionEvent ev) {int actionMasked = ev.getActionMasked();开关(actionMasked){案例 MotionEvent.ACTION_DOWN:Log.d("RowView", "OnInterceptTouchEvent - Down");tapDetector.onTouchEvent(ev);返回假；案例 MotionEvent.ACTION_CANCEL:Log.d("RowView", "OnInterceptTouchEvent - 取消");tapDetector.onTouchEvent(ev);休息;案例 MotionEvent.ACTION_UP:如果(tapDetector.onTouchEvent(ev)){Log.d("RowView", "OnInterceptTouchEvent - UP!");返回真；}休息;}返回 super.onInterceptTouchEvent(ev);}

有解决这个问题的建议吗?

编辑:关于如何在 ViewPager 处于活动状态时不调用 MainActivity 中的 onItemClick 的无效示例(棒棒糖列表选择器也不出现)

<块引用>

主活动

ListView listView = (ListView) findViewById(R.id.main_list);listView.setAdapter(new MainListAdapter(this, 30));listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {@覆盖public void onItemClick(AdapterView parent, View view, int position, long id) {Log.d(TAG, "onItemClick:" + 位置);}});

<块引用>

列表项 XML:

<块引用>
列表适配器:
公共类 MainListAdapter 扩展 BaseAdapter {私有上下文上下文；私人 LayoutInflater 充气机；私人整数计数；公共 MainListAdapter(上下文上下文，int 计数){this.context = 上下文；this.inflater = LayoutInflater.from(context);this.count = 计数；}@覆盖公共 int getCount() {返回计数；}@覆盖公共对象getItem(int位置){返回位置；}@覆盖public long getItemId(int position){返回位置；}@覆盖public View getView(int position, View convertView, ViewGroup parent) {ViewHolder 支架；if(convertView == null) {持有人 = 新的 ViewHolder();convertView = createRow(父级，持有者)；} 别的 {持有人 = (ViewHolder) convertView.getTag();}holder.textView.setText(Integer.toString(position));int randomPages = (int) (new Random().nextDouble()*5+2);holder.viewPager.setAdapter(new NumAdapter(context, randomPages));返回转换视图；}私有视图 createRow(ViewGroup parent, ViewHolder holder) {查看视图 = inflater.inflate(R.layout.row_main_listview, parent, false);holder.textView = (TextView) view.findViewById(R.id.row_num);holder.viewPager = (ViewPager) view.findViewById(R.id.row_viewpager);view.setTag(持有人)；返回视图；}私有静态类 ViewHolder {公共文本视图文本视图；公共 ViewPager viewPager;}}
<块引用>
ViewPager 的适配器:
公共类 NumAdapter 扩展 PagerAdapter {私人 LayoutInflater 充气机；私人整数计数；公共 NumAdapter(上下文上下文，int 计数){this.inflater = LayoutInflater.from(context);this.count = 计数；}@覆盖公共对象实例化项(ViewGroup 容器，int 位置){TextView textView = (TextView) inflater.inflate(R.layout.page_viewpager, container, false);textView.setText("页面" + 位置);容器.addView(textView);返回文本视图；}@覆盖公共 int getCount() {返回计数；}@覆盖公共布尔 isViewFromObject(查看 arg0，对象 arg1){返回 arg0 == arg1；}@覆盖public void destroyItem(ViewGroup container, int position, Object object) {container.removeView((View)object);}}
 解决方案 
尽管列表选择器不起作用，但这是我最终为解决此问题所做的工作.这可以改进，但就目前而言，这是我喜欢它工作方式的唯一解决方法.
public class CustomListView extends ListView implements AbsListView.OnScrollListener {/** 用于检测水龙头*/私有 GestureDetector TapDetector；/** 因为我们需要设置我们自己的 OnScrollListener，所以这里存储一个* 在外面使用，如果有的话*/私人 OnScrollListener onScrollListener;私有布尔 isScrolling = false;公共CustomListView(上下文上下文){超级(上下文)；初始化视图(上下文)；}公共CustomListView(上下文上下文，AttributeSet attrs){超级(上下文，属性)；初始化视图(上下文)；}public CustomListView(上下文上下文，AttributeSet attrs，int defStyleAttr){超级(上下文，属性，defStyleAttr)；初始化视图(上下文)；}@TargetApi(Build.VERSION_CODES.LOLLIPOP)public CustomListView(上下文上下文，AttributeSet attrs，int defStyleAttr，int defStyleRes){超级(上下文，属性，defStyleAttr，defStyleRes)；初始化视图(上下文)；}私人无效initView(上下文上下文){tapDetector = new GestureDetector(context, new TapListener());super.setOnScrollListener(this);}@覆盖公共无效 setOnScrollListener(OnScrollListener onScrollListener){this.onScrollListener = onScrollListener;}@覆盖公共布尔dispatchTouchEvent(MotionEvent ev){boolean isTap = tapDetector.onTouchEvent(ev);if(ev.getActionMasked() == MotionEvent.ACTION_UP) {//如果 ListView 正在滚动，则不执行单击//所以它能够停止滚动if(isTap && !isScrolling && hasOnItemClickListener()) {int itemPosition = pointToPosition((int)ev.getX(), (int)ev.getY());performItemClick(this, itemPosition, getItemIdAtPosition(itemPosition));}}返回 super.dispatchTouchEvent(ev);}公共布尔 hasOnItemClickListener() {返回 getOnItemClickListener() != null;}@覆盖公共无效 onScrollStateChanged(AbsListView 视图，int scrollState){isScrolling = scrollState != OnScrollListener.SCROLL_STATE_IDLE;如果(this.onScrollListener！= null){onScrollListener.onScrollStateChanged(view, scrollState);}}@覆盖公共无效 onScroll(AbsListView 视图，int firstVisibleItem，int visibleItemCount，int totalItemCount){如果(this.onScrollListener！= null){onScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);}}
I have a ViewPager inside every row of a ListView. It works fine, it changes the views inside it when the user use the swipe gesture, but it prevents the ListView's onItemClick method to be called. I know that the ViewPager is the culprit because when I hide it, the onItemClick is called, so this is what I am trying:

I have created a ViewGroup to be the row (RowView). This ViewGroup has onInterceptTouchEvent overriden to avoid the ViewPager to handle further touch events when I detect a click. But the onItemClick callback is still not being called. And the list selector doesn't show either on click. I want this two features to work.

This is how the onInterceptTouchEvent from RowView looks like:
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    int actionMasked = ev.getActionMasked();
    switch(actionMasked) {
        case MotionEvent.ACTION_DOWN:
            Log.d("RowView", "OnInterceptTouchEvent - Down");
            tapDetector.onTouchEvent(ev);
            return false;
        case MotionEvent.ACTION_CANCEL:
            Log.d("RowView", "OnInterceptTouchEvent - Cancel");
            tapDetector.onTouchEvent(ev);
            break;
        case MotionEvent.ACTION_UP:
            if(tapDetector.onTouchEvent(ev)) {
                Log.d("RowView", "OnInterceptTouchEvent - UP!");
                return true;
            }
            break;
    }

    return super.onInterceptTouchEvent(ev);
}
Any suggestions to solve this?

EDIT: Not working example about how the onItemClick in MainActivity is not called when the ViewPager is active (Lollipop list selector doesn't appear either)

  MainActivity


ListView listView = (ListView) findViewById(R.id.main_list);
listView.setAdapter(new MainListAdapter(this, 30));
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Log.d(TAG, "onItemClick: " + position);
    }
});



  List item XML:


<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="80dp"
    android:descendantFocusability="blocksDescendants"
    >

    <TextView
        android:id="@+id/row_num"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        />

    <android.support.v4.view.ViewPager
        android:id="@+id/row_viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="visible"
        />
</RelativeLayout>



  List adapter:


public class MainListAdapter extends BaseAdapter {
    private Context context;
    private LayoutInflater inflater;
    private int count;

    public MainListAdapter(Context context, int count) {
        this.context = context;
        this.inflater = LayoutInflater.from(context);
        this.count = count;
    }

    @Override
    public int getCount() {
        return count;
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;

        if(convertView == null) {
            holder = new ViewHolder();
            convertView = createRow(parent, holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.textView.setText(Integer.toString(position));
        int randomPages = (int) (new Random().nextDouble()*5+2);
        holder.viewPager.setAdapter(new NumAdapter(context, randomPages));

        return convertView;
    }

    private View createRow(ViewGroup parent, ViewHolder holder) {
        View view = inflater.inflate(R.layout.row_main_listview, parent, false);
        holder.textView = (TextView) view.findViewById(R.id.row_num);
        holder.viewPager = (ViewPager) view.findViewById(R.id.row_viewpager);
        view.setTag(holder);

        return view;
    }

    private static class ViewHolder {
        public TextView textView;
        public ViewPager viewPager;
    }
}



  ViewPager's Adapter: 


public class NumAdapter extends PagerAdapter {
    private LayoutInflater inflater;
    private int count;

    public NumAdapter(Context context, int count) {
        this.inflater = LayoutInflater.from(context);
        this.count = count;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        TextView textView = (TextView) inflater.inflate(R.layout.page_viewpager, container, false);
        textView.setText("Page " + position);
        container.addView(textView);
        return textView;
    }

    @Override
    public int getCount() {
        return count;
    }

    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        return arg0 == arg1;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View)object);
    }
}

 解决方案 
This is what I've done finally to manage this although the list selector doesn't work. This could be improved, but, for now, it is the only workaround that I like how it works.
public class CustomListView extends ListView implements AbsListView.OnScrollListener {
    /*
     *  Used for detect taps
     */
    private GestureDetector tapDetector;
    /*
     *  As we need to set our own OnScrollListener, this stores the one 
     *  used outside, if any
     */
    private OnScrollListener onScrollListener;

    private boolean isScrolling = false;

    public CustomListView(Context context) {
        super(context);
        initView(context);
    }

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

    public CustomListView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView(context);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public CustomListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        initView(context);
    }

    private void initView(Context context) {
        tapDetector = new GestureDetector(context, new TapListener());
        super.setOnScrollListener(this);
    }

    @Override
    public void setOnScrollListener(OnScrollListener onScrollListener) {
        this.onScrollListener = onScrollListener;
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        boolean isTap = tapDetector.onTouchEvent(ev);

        if(ev.getActionMasked() == MotionEvent.ACTION_UP) {
            // Don't perform the click if the ListView is scrolling
            // so it is able to stop the scroll
            if(isTap && !isScrolling && hasOnItemClickListener()) {
                int itemPosition = pointToPosition((int)ev.getX(), (int)ev.getY());
                performItemClick(this, itemPosition, getItemIdAtPosition(itemPosition));
            }
        }

        return super.dispatchTouchEvent(ev);
    }

    public boolean hasOnItemClickListener() {
        return getOnItemClickListener() != null;
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        isScrolling = scrollState != OnScrollListener.SCROLL_STATE_IDLE;

        if(this.onScrollListener != null) {
            onScrollListener.onScrollStateChanged(view, scrollState);
        }
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
        if(this.onScrollListener != null) {
            onScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
        }
    }


                        
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