6

我正在尝试使用 Recyclerviews 在 android 中创建一个 EPG。它需要固定顶行水平滚动以显示与时间相对应的节目，并固定最左列垂直滚动以显示各种频道。

基于this SO answer，我提供了以下内容设计

    <?xml version="1.0" encoding="utf-8"?>
    <!--Outer container layout-->
    <LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    tools:context=".MainActivity">

    <!--To display Channels list-->
    <LinearLayout
        android:layout_width="150dp"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <!--Position (0,0)-->
        <TextView
            android:id="@+id/tv_change_date"
            android:layout_width="match_parent"
            android:layout_height="50dp" />

        <android.support.v7.widget.RecyclerView
            android:id="@+id/rcv_channel_name"
            android:scrollbars="none"
            android:layout_width="150dp"
            android:layout_height="match_parent"/>

        </LinearLayout>


    <!--To display Time and Programs list-->
    <HorizontalScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:orientation="vertical">

                <!--Time horizontal list-->
                <android.support.v7.widget.RecyclerView
                    android:id="@+id/rcv_vertical_header"
                    android:scrollbars="none"
                    android:layout_width="match_parent"
                    android:layout_height="50dp"/>

                <!--Vertical list whose each element is horizontal list to show programs-->
                <android.support.v7.widget.RecyclerView
                    android:id="@+id/rcv_vertical"
                    android:scrollbars="vertical"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"/>
            </LinearLayout>

    </HorizontalScrollView>
</LinearLayout>

现在，我需要同步 rcv_vertical 和 rcv_channel_name 的垂直滚动。我在这个github 项目中实现了它。

public class SelfRemovingOnScrollListener extends RecyclerView.OnScrollListener {

    @Override
    public final void onScrollStateChanged(@NonNull final RecyclerView recyclerView, final int newState) {
        super.onScrollStateChanged(recyclerView, newState);
        if (newState == RecyclerView.SCROLL_STATE_IDLE) {
            recyclerView.removeOnScrollListener(this);
        }
    }
}

在 MainActivity

private final RecyclerView.OnScrollListener channelScrollListener = new SelfRemovingOnScrollListener() {
    @Override
    public void onScrolled(@NonNull final RecyclerView recyclerView, final int dx, final int dy) {
        super.onScrolled(recyclerView, dx, dy);
        programsRecyclerView.scrollBy(dx, dy);
    }
};
private final RecyclerView.OnScrollListener programScrollListener = new     SelfRemovingOnScrollListener() {

    @Override
    public void onScrolled(@NonNull final RecyclerView recyclerView, final int dx, final int dy) {
        super.onScrolled(recyclerView, dx, dy);
        channelsRecyclerView.scrollBy(dx, dy);
    }
};

@Override
protected void onStart() {
    super.onStart();
 //Sync channel name RCV and Programs RCV scrolling
    channelsRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
        private int mLastY;

        @Override
        public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
            Log.d("debug", "LEFT: onInterceptTouchEvent");

            final Boolean ret = rv.getScrollState() != RecyclerView.SCROLL_STATE_IDLE;
            if (!ret) {
                onTouchEvent(rv, e);
            }
            return Boolean.FALSE;
        }

        @Override
        public void onTouchEvent(RecyclerView rv, MotionEvent e) {
            Log.d("debug", "LEFT: onTouchEvent");


            final int action;
            if ((action = e.getAction()) == MotionEvent.ACTION_DOWN && programsRecyclerView
                    .getScrollState() == RecyclerView.SCROLL_STATE_IDLE) {
                mLastY = rv.getScrollY();
                Log.d("scroll","channelsRecyclerView Y: "+mLastY);
                rv.addOnScrollListener(channelScrollListener);
            }
            else {
                if (action == MotionEvent.ACTION_UP && rv.getScrollY() == mLastY) {
                    rv.removeOnScrollListener(channelScrollListener);
                }
            }
        }

        @Override
        public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
            Log.d("debug", "LEFT: onRequestDisallowInterceptTouchEvent");
        }
    });

    programsRecyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {

        private int mLastY;

        @Override
        public boolean onInterceptTouchEvent(@NonNull final RecyclerView rv, @NonNull final
        MotionEvent e) {
            Log.d("debug", "RIGHT: onInterceptTouchEvent");

            final Boolean ret = rv.getScrollState() != RecyclerView.SCROLL_STATE_IDLE;
            if (!ret) {
                onTouchEvent(rv, e);
            }
            return Boolean.FALSE;
        }

        @Override
        public void onTouchEvent(@NonNull final RecyclerView rv, @NonNull final MotionEvent e) {
            Log.d("debug", "RIGHT: onTouchEvent");

            final int action;
            if ((action = e.getAction()) == MotionEvent.ACTION_DOWN && channelsRecyclerView
                    .getScrollState
                            () == RecyclerView.SCROLL_STATE_IDLE) {
                mLastY = rv.getScrollY();
                rv.addOnScrollListener(programScrollListener);
                Log.d("scroll","programsRecyclerView Y: "+mLastY);
            }
            else {
                if (action == MotionEvent.ACTION_UP && rv.getScrollY() == mLastY) {
                    rv.removeOnScrollListener(programScrollListener);
                }
            }
        }

        @Override
        public void onRequestDisallowInterceptTouchEvent(final boolean disallowIntercept) {
            Log.d("debug", "RIGHT: onRequestDisallowInterceptTouchEvent");
        }
    });
[![}][3]][3]

它工作正常，直到我在 Horizo​​ntalScrollView 内进行水平滚动。之后，左侧的 recyclerview "rcv_channel_name" 的滚动速度比右侧的 rcv_vertical 快。

非常感谢任何解决此问题的帮助或建议。

4

2 回答 2

3

已编辑！ 我终于设法使这个工作！这是我的简短解决方案（另请参见使用 d-pad 进行基于焦点的输入的旧答案）：

首先，您需要 3 个回收器（在 Fragment 或 Activity 中）：

public RecyclerView vertical_recycler, current_focus_recycler, time_recycler;

然后加

public int scroll_offset;

此变量将保存以像素为单位的滚动偏移以供进一步使用。接下来正确填充您的垂直 RecyclerView，确保您的 RecyclerView 具有水平 RecyclerViews 作为子级。还要确保您的 time_recycler 将比任何 Horizo​​ntal_recycler 长（在其适配器的 getItemCount 中返回 Integer.MAX_VALUE 将确保您很好......有点......）：

@Override
    public int getItemCount() {
        return Integer.MAX_VALUE;
    }

接下来在 Activity 或 Fragment 中添加滚动监听器

time_recycler.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                horizontal_scroll(dx);
                if (dx == 0) {
                    scroll_offset = 0;
                } else {
                    scroll_offset += dx;
                }
            }
        });

public void horizontal_scroll(int dx) {
        for (int i = 0, n = vertical_recycler.getChildCount(); i < n; ++i) {
            if (vertical_recycler.getChildAt(i).findViewById(R.id.horizontal_recycler) != current_focus_recycler) {
                vertical_recycler.getChildAt(i).findViewById(R.id.horizontal_recycler).scrollBy(dx, 0);
            }
        }
    }

在垂直 RecyclerView 的适配器中添加所需的其他功能：

private AdapterSheduleHorizontal adapter_horizontal;

    @Override
    public void onViewAttachedToWindow(AdapterSheduleVertical.VerticalViewHolder holder){
        super.onViewAttachedToWindow(holder);

        ((LinearLayoutManager) holder.horizontal_recycler.getLayoutManager())
                .scrollToPositionWithOffset(0,
                        -fragmentShedule.scroll_offset);
        holder.horizontal_recycler.addOnScrollListener(onScrollListener);

    }

    @Override
    public void onViewDetachedFromWindow(VerticalViewHolder holder) {
        super.onViewDetachedFromWindow(holder);
        holder.horizontal_recycler.removeOnScrollListener(onScrollListener);
    }


    RecyclerView.OnScrollListener onScrollListener = new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            if(recyclerView == fragmentShedule.current_focus_recycler) {
                fragmentShedule.time_recycler.scrollBy(dx, 0);
            }

        }

        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int state) {
            super.onScrollStateChanged(recyclerView, state);
            switch (state) {
                case RecyclerView.SCROLL_STATE_IDLE:
                    fragmentShedule.current_focus_recycler = null;
                    break;
            }
        }


    };

@Override
    public void onBindViewHolder(VerticalViewHolder sheduleViewHolder, final int position) {

...
        LinearLayoutManager lm = new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false);
        sheduleViewHolder.horizontal_recycler.setLayoutManager(lm);
        adapter_horizontal = new AdapterSheduleHorizontal(fragmentShedule, context, dayItemList);
        sheduleViewHolder.horizontal_recycler.setAdapter(adapter_horizontal);
...
    }

Next 在水平 RecyclerView 的适配器中

...
    RecyclerView parent_recyclerview;
@Override
    public void onBindViewHolder(final HorizontalViewHolder sheduleViewHolder, final int i) {


        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.MATCH_PARENT);

        lp.width = 500;//some width to 

        sheduleViewHolder.shedule_item.setLayoutParams(lp);

        sheduleViewHolder.itemView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {

                switch (event.getAction()){
                    case MotionEvent.ACTION_DOWN:
                        fragmentShedule.current_focus_recycler = parent_recyclerview;
                        break;
                }

                return false;
            }
        });

        sheduleViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context, "click"+i, Toast.LENGTH_SHORT).show();
            }
        });


    }

    @Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
        parent_recyclerview = recyclerView;
    }

我相信仅此而已。请随时发表评论并告诉我它是否不适合您，我会仔细检查我的代码（我已经针对所有孩子的垂直和水平滚动测试了它）。

旧答案

好的，我将展示适用于我的类似 EPG 的应用程序的方法。

让我们假设你有 RecyclerView 和 RecyclerView 孩子。父母垂直滚动，孩子水平滚动。在此布局之上，您还有另一个带有时间线的 RecyclerView（也可以水平滚动）。

您需要滚动时间线以滚动所有回收者-孩子，除了获得焦点/被触摸/正在滚动的那个（如果您不打算使用触摸屏功能，则只能使用水平视图的孩子的焦点） .

话虽如此，您需要注册当前正在滚动的子 RecyclerView。

public RecyclerView vertical_recycler, current_focus_recycler, time_recycler;

我还注册了一次滚动所有水平 RecyclerViews 的方法：

public void horizontal_scroll(int dx) {
        for (int i = 0, n = vertical_recycler.getChildCount(); i < n; ++i) {
            if (vertical_recycler.getChildAt(i).findViewById(R.id.horizontal_recycler) != current_focus_recycler) {
                vertical_recycler.getChildAt(i).findViewById(R.id.horizontal_recycler).scrollBy(dx, 0);
            }
        }
    }

在为我的 time_recycler 设置适配器后，我添加了监听器：

time_recycler.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                horizontal_scroll(dx);
            }
        });

到目前为止，一切都很好。比在对应于水平 RecyclerView-child 的适配器中，我添加了：

RecyclerView parent_recyclerview;

RecyclerView.OnScrollListener onScrollListener = new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {


        super.onScrolled(recyclerView, dx, dy);
            ((ActivityMain) context).time_recycler.scrollBy(dx, 0);
        }
    };

//...

@Override
    public void onBindViewHolder(final HorizontalViewHolder viewHolder, final int i) {

    viewHolder.shedule_item.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if (v.hasFocus()) {
                ((ActivityMain) context).current_focus_recycler = parent_recyclerview;
                parent_recyclerview.addOnScrollListener(onScrollListener);
            } else {
                parent_recyclerview.removeOnScrollListener(onScrollListener);
            }
        }
    });

}

@Override
    public void onAttachedToRecyclerView(RecyclerView recyclerView) {
        super.onAttachedToRecyclerView(recyclerView);
        parent_recyclerview = recyclerView;
    }

//...

class HorizontalViewHolder extends RecyclerView.ViewHolder {
        private LinearLayout shedule_item;
    public HorizontalViewHolder(View view) {
        super(view);
        shedule_item = (LinearLayout) view.findViewById(R.id.shedule_item);
    }
}

水平 RecyclerView 项目的布局是：

<LinearLayout
    android:id="@+id/shedule_item" 
            .../>
    ...
</LinearLayout>

如果我使用键盘并使用箭头键在 epg 表中导航，这适用于我的情况。通过一些调整（在灰烬中有些痛苦），您将能够拦截从父水平回收器到其子级的触摸事件。希望对您有所帮助。

于 2017-06-11T21:57:43.857 回答
0

继续 Roman T 上面提供的答案，这修复了在投掷动作的情况下回收者视图不同步（主要是在相反方向投掷的情况下引起的）

sheduleViewHolder.itemView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {

            switch (event.getAction()){
                case MotionEvent.ACTION_DOWN:
                    if (fragmentShedule.current_focus_recycler != null) {
                        //stop any scroll due to fling on recyclerview currently in focus
                        fragmentShedule.current_focus_recycler.stopScroll();
                    }
                    fragmentShedule.current_focus_recycler = parent_recyclerview;
                    break;
            }

            return false;
        }
    });


添加了一个 stopScroll 方法来取消任何正在进行的滚动，因为在最后一次触摸的回收器视图上投掷
PS：由于声誉低，将其作为答案提交。

于 2017-08-29T18:14:37.963 回答