android – 带有固定列和标题的RecyclerView,以及可滚动的页脚

首先,我扩展了Horizo​​ntalScrollView以向我报告scroll事件,添加一个监听器：

public class Myhorizontalscrollview extends horizontalscrollview {

    private OnScrollListener listener;

    @Override
    protected void onScrollChanged(int l,int t,int oldl,int oldt) {
        super.onScrollChanged(l,t,oldl,oldt);
        if (listener != null) listener.onScroll(this,l,t);
    }

    public void setonScrollListener(OnScrollListener listener) {
        this.listener = listener;
    }

    public interface OnScrollListener {
        void onScroll(horizontalscrollview view,int x,int y);
    }       
}

然后,我用LinearLayout创建了我的布局,包含我的标题和我的Activity的ListView(或片段,如果你需要的话).

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <include
        android:id="@+id/header"
        layout="@layout/header" />

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

我的列表中的每个项目都是LinearLayout,带有TextView(固定列)和Horizo​​ntalScrollView.标题和行的布局如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <TextView
        style="?android:attr/textAppearanceMedium"
        android:background="#f00"
        android:minWidth="40dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <View
        android:layout_width="1px"
        android:layout_height="match_parent"
        android:background="@android:color/black" />

    <net.rafaeltoledo.example.Myhorizontalscrollview
        android:id="@+id/scroll"
        android:scrollbars="none"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

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

            <!-- Childs,or columns -->

        </LinearLayout>

    </net.rafaeltoledo.example.Myhorizontalscrollview>

</LinearLayout>

诀窍是滚动所有在EventBus的帮助下(我使用了GreenRobot’s)触发水平滚动事件并将所有滚动器移动为一个.我的事件对象包含来自侦听器类的相同数据(也许我可以使用侦听器对象本身？)

public static class Event {

    private final int x;
    private final int y;
    private final horizontalscrollview view;

    public Event(horizontalscrollview view,int y) {
        this.x = x;
        this.y = y;
        this.view = view;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public horizontalscrollview getView() {
        return view;
    }
}

列表适配器类接收要在每个项目的Horizo​​ntalScrollView中设置的侦听器.

public static class Adapter extends BaseAdapter {

    private final Context context;
    private Myhorizontalscrollview.OnScrollListener listener;

    public Adapter(Context context,Myhorizontalscrollview.OnScrollListener listener) {
        this.context = context;
        this.listener = listener;
    }

    @Override
    public int getCount() {
        return 30;
    }

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

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

    @Override
    public View getView(int position,View convertView,ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.header,parent,false);
            Myhorizontalscrollview scroll = (Myhorizontalscrollview) convertView.findViewById(R.id.scroll);
            scroll.setonScrollListener(listener);
        }
        return convertView;
    }

    public Context getContext() {
        return context;
    }
}

在继续之前,我将MyHorizo​​ntalScrollView注册到EventBus,将EventBus.getDefault().register(this)添加到每个版本的构造函数中,并向其添加了receiver方法：

public void onEventMainThread(MainActivity.Event event) {
    if (!event.getView().equals(this)) scrollTo(event.getX(),event.getY());
}

这将滚动到收到的位置,如果它本身不是触发滚动事件.

最后,我在Activity的onCreate()方法中设置了所有内容：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.list);

    Myhorizontalscrollview.OnScrollListener listener = new Myhorizontalscrollview.OnScrollListener() {
        @Override
        public void onScroll(horizontalscrollview view,int y) {
            Log.d("Scroll Event",String.format("Fired! %d %d",x,y));
            EventBus.getDefault().post(new Event(view,y));
        }
    };

    ListView listView = (ListView) findViewById(R.id.list);

    ViewGroup header = (ViewGroup) findViewById(R.id.header);
    header.getChildAt(0).setBackgroundColor(Color.WHITE);
    header.setBackgroundColor(Color.BLUE);
    ((Myhorizontalscrollview) header.findViewById(R.id.scroll)).setonScrollListener(listener);

    listView.setAdapter(new Adapter(this,listener));
    listView.addFooterView(getLayoutInflater().inflate(R.layout.footer,listView,false));
}

(请忽略一些奇怪的颜色,这是为了更好地查看正在发生的事情).

而ta-daa,这是理想的结果！