ListView行中的ViewPager可防止触发onItemClick

Question

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,所以这就是我想要的:

我创建了一个ViewGroup作为行(RowView).此ViewGroup已onInterceptTouchEvent重写,以避免ViewPager在检测到单击时处理更多触摸事件.但仍未调用onItemClick回调.并且列表选择器不会在单击时显示.我想要这两个功能.

这是RowView的onInterceptTouchEvent的样子:

@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);
}

有什么建议可以解决吗？

编辑:关于如何在ViewPager处于活动状态时未调用MainActivity中的onItemClick的示例(Lollipop列表选择器也未出现)

主要活动

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);
    }
});

列表项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>

列表适配器:

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的适配器:

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);
    }
}

Answer 1

我认为更好的覆盖列表视图onintercepter而不是viewgroup.

TouchEvent Flow简单地说:

活动触摸事件 - > viewgroup.dispatchtouchevent - > viewgroup.intercepter ..-> view.dispatchtouch ... - > .....

在这种情况下list.dispatch调用.把事件扔到ViewPager.dispatch.但之前ViewPager.dispatchtouchevent,打电话ListView.intercepterTouchEvent.

如果dispatchTouchEvent返回false调用父View的TouchEvent,但回报true呼叫流程血统.

如果intercepterTouchEvent返回true不是呼叫孩子dispatchTouchEvent而是返回false呼叫孩子dispatchTouchEvent.所以listview.intercepterTouchEvent回来true,打电话给o nItemClick.

所以如果listView.intercepterTouchEvent退货true,不要刷viewPager品.

你可以知道用户的动作滑动或点击2方式. TouchEvent和guesturedetector..

在listview的 IntercepterTouchEvent(Event ev);

VelocityTracker mVelocityTracker;
PointF mLastPoint;
public mListView(Context context) {
    super(context);
    init();
}

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

public mListView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
}

private void init(){
    mLastPoint = new PointF();
}


@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {

    if(mVelocityTracker == null)
        mVelocityTracker = VelocityTracker.obtain();
    mVelocityTracker.addMovement(ev);

    switch (ev.getAction()){
        case MotionEvent.ACTION_MOVE:
            mVelocityTracker.computeCurrentVelocity(100);
            int x = (int)Math.abs(mVelocityTracker.getXVelocity());
            int move_x = (int)Math.abs(ev.getX() - mLastPoint.x);
            Log.d("ListView","speed : " + x +" move_x : " + move_x);
            //here x is drag speed. (pixel/s)
            // change value left right both value you want speed and move amount
            if(move_x < 100 || x <100) {
                mLastPoint.set(ev.getX(), ev.getY());
                return true;
            }
            break;
        case MotionEvent.ACTION_DOWN:
            mLastPoint.set(ev.getX(), ev.getY());
            break;
        case MotionEvent.ACTION_UP:

            mVelocityTracker.recycle();mVelocityTracker = null;

            break;
    }
    return super.onInterceptTouchEvent(ev);
}

你可以刷速度约100或移动量100像素.如果没有执行点击事件.

我希望这篇文章可以帮助你......

并添加编辑一些代码打击.

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {

    if(mVelocityTracker == null)
        mVelocityTracker = VelocityTracker.obtain();
    mVelocityTracker.addMovement(ev);

    switch (ev.getAction()){
        case MotionEvent.ACTION_MOVE:
            mVelocityTracker.computeCurrentVelocity(10);
            int x = (int)Math.abs(mVelocityTracker.getXVelocity());
            int move_x = (int)Math.abs(ev.getX() - mLastPoint.x);
            int move_y = (int)Math.abs(ev.getY() - mLastPoint.y);
            Log.d("ListView","speed : " + x +" move_x : " + move_x + " move_y : "+ move_y);
            if(move_x < move_y || x < 10) {
                mLastPoint.set(ev.getX(), ev.getY());
                return true;
            }else if(move_x > move_y){
                return false;
            }
            break;
        case MotionEvent.ACTION_DOWN:
            mLastPoint.set(ev.getX(), ev.getY());
            break;
        case MotionEvent.ACTION_UP:
            break;
    }
    return super.onInterceptTouchEvent(ev);
}

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    Log.d("ListView", "dispatch");
    switch (ev.getAction()){
        case MotionEvent.ACTION_MOVE:
            break;
        case MotionEvent.ACTION_DOWN:
            break;
        case MotionEvent.ACTION_UP:
            if(mVelocityTracker != null){mVelocityTracker.recycle();mVelocityTracker = null;}
            break;
    }
    return super.dispatchTouchEvent(ev);;
}

Answer 2

尽管列表选择器不起作用，但这就是我最终为管理此问题所做的事情。这可以改进，但是，就目前而言，这是我喜欢它的工作方式的唯一解决方法。

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);
        }
    }