我正在尝试对布局实现选框效果，以帮助它从右侧内侧滚动/动画到左侧内侧，就像股票代码 View 一样。

通过以下两个链接，您将能够获得更多的知识，就像股市通过以循环恒定的方式显示值(value)来让用户保持更新一样。

1) http://www.sify.com/finance/livemarkets/

2) http://terminal.moneycontrol.com/index.php?wl=indices

为此，我在下面的代码中实现了一些类似。

public class HorizonalSlideActivity extends Activity
{
    private LinearLayout horizontalOuterLayout;
    private HorizontalScrollView horizontalScrollview;
    private int scrollMax;
    private int scrollPos = 0;
    private TimerTask scrollerSchedule;
    private Timer scrollTimer = null;
    private ScrollAdapter adapter = null;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.horizontal_layout);

        adapter = new ScrollAdapter(HorizonalSlideActivity.this);

        horizontalScrollview = (HorizontalScrollView) findViewById(R.id.horiztonal_scrollview_id);
        horizontalScrollview.setOnTouchListener(new OnTouchListener()
        {
            @Override
            public boolean onTouch(View v, MotionEvent event)
            {
                return false;
            }
        });
        horizontalOuterLayout = (LinearLayout) findViewById(R.id.horiztonal_outer_layout_id);
        horizontalTextView = (TextView) findViewById(R.id.horizontal_textview_id);
        horizontalScrollview.setHorizontalScrollBarEnabled(false);

        addData();


        ViewTreeObserver vto = horizontalOuterLayout.getViewTreeObserver();
        vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener()
        {
            @Override
            public void onGlobalLayout()
            {
                horizontalOuterLayout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                getScrollMaxAmount();
                startAutoScrolling();
            }
        }); 
    }

    private void addData()
    {
        for (int i = 0; i < adapter.getCount(); i++)
        {
            View convertView = adapter.getView(i, null, null);
            horizontalOuterLayout.addView(convertView);
        }
    }

    public void getScrollMaxAmount()
    {
        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        int width = size.x;
        Log.e("getScrollMaxAmount", "getWidth == "+width);
        Log.e("getScrollMaxAmount", "getMeasuredWidth == "+horizontalOuterLayout.getMeasuredWidth());
        int actualWidth = (horizontalOuterLayout.getMeasuredWidth() - width);
        Log.e("getScrollMaxAmount", "actualWidth == "+actualWidth);
        scrollMax = actualWidth;
        Log.e("getScrollMaxAmount", "scrollMax == "+scrollMax);
    }

    public void startAutoScrolling()
    {
        if (scrollTimer == null)
        {
            scrollTimer = new Timer();
            final Runnable TimerTick = new Runnable()
            {
                public void run()
                {
                    moveScrollView();
                }
            };

            if (scrollerSchedule != null)
            {
                scrollerSchedule.cancel();
                scrollerSchedule = null;
            }
            scrollerSchedule = new TimerTask()
            {
                @Override
                public void run()
                {
                    runOnUiThread(TimerTick);
                }
            };

            scrollTimer.schedule(scrollerSchedule, 3000, 30);
        }
    }

    public void moveScrollView()
    {
        Log.e("moveScrollView", "scrollMax == "+scrollMax);
        scrollPos = (int) (horizontalScrollview.getScrollX() + 1.0);
        Log.e("moveScrollView", "scrollPos == "+scrollPos);
        if (scrollPos >= scrollMax)
        {
            scrollPos = 0;
        }
        horizontalScrollview.scrollTo(scrollPos, 0);
    }

    public void stopAutoScrolling()
    {
        if (scrollTimer != null)
        {
            scrollTimer.cancel();
            scrollTimer = null;
        }
    }

    public void onBackPressed()
    {
        super.onBackPressed();
        finish();
    }

    public void onPause()
    {
        super.onPause();
        finish();
    }

    public void onDestroy()
    {
        clearTimerTaks(scrollerSchedule);
        clearTimers(scrollTimer);

        scrollerSchedule = null;
        scrollTimer = null;
        super.onDestroy();
    }

    private void clearTimers(Timer timer)
    {
        if (timer != null)
        {
            timer.cancel();
            timer = null;
        }
    }

    private void clearTimerTaks(TimerTask timerTask)
    {
        if (timerTask != null)
        {
            timerTask.cancel();
            timerTask = null;
        }
    }
}

这是该文件的布局:

<?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="match_parent"
    android:orientation="vertical" >

    <HorizontalScrollView
        android:id="@+id/horiztonal_scrollview_id"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fadingEdge="none" >

        <LinearLayout
            android:id="@+id/horiztonal_outer_layout_id"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="#ffffff"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:paddingBottom="5dip"
            android:paddingTop="5dip" >
        </LinearLayout>
    </HorizontalScrollView>

</LinearLayout>

显示数据的适配器类:

public class ScrollAdapter extends BaseAdapter
{

    private Context context;

    public ScrollAdapter(Context context)
    {
        this.context = context;
    }

    @Override
    public int getCount()
    {
        return 10;
    }

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

    @Override
    public long getItemId(int position)
    {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        LayoutInflater inflater = ((Activity)context).getLayoutInflater();
        convertView = inflater.inflate(R.layout.scroll_child, null);
        return convertView;
    }

}

及其xml文件:

<?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="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/txtPercent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:paddingLeft="30dp"
        android:paddingRight="30dp"
        android:text="0.14%" />

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

    <TextView
        android:id="@+id/txtData"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:paddingLeft="30dp"
        android:paddingRight="30dp"
        android:text="data" />

</LinearLayout>

通过实现这一点，我有点接近但无法做出想要的东西。请帮我让它在没有任何中断的情况下循环并在最后一个数据从左侧移入后重新开始滚动。

这是想要的结果:

我也检查了this link ，它提供了所需的滚动效果，但不显示整个数据，它只显示 3 到 4 个 View ，但正如您所见，我在适配器类中添加了 10 个数据。

任何形式的帮助都将是可观的。

提前致谢。

最佳答案

可以使用 Recycleview 和 autoscroll runnable 来完成。 在此处添加代码 fragment

1. MainActivity (MarqueeViewSample.java)

package com.test.mo.test;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;

/**
* Created by jovin.pj on 29-07-2015.
*/
public class MarqueeViewSample extends Activity {

private final Runnable SCROLLING_RUNNABLE = new Runnable() {

    @Override
    public void run() {
        final int duration = 10;
        final int pixelsToMove = 10;
        marqueList.smoothScrollBy(pixelsToMove, 0);
        mHandler.postDelayed(this, duration);
    }
};

private final Handler mHandler = new Handler(Looper.getMainLooper());
private RecyclerView marqueList;
//private boolean loading = true;
private boolean foundTotalPixel = true;
private int pastVisiblesItems, visibleItemCount, totalItemCount;
private int totalMovedPixel;
private int totalPixel;

/**
 * Called when the activity is first created.
 */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    marqueList = (RecyclerView) findViewById(R.id.marqueList);
    final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
    layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);
    marqueList.setLayoutManager(layoutManager);
    marqueList.setAdapter(new ScrollAdapter());

    marqueList.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            totalMovedPixel = totalMovedPixel + dx;
            visibleItemCount = layoutManager.getChildCount();
            totalItemCount = layoutManager.getItemCount();
            pastVisiblesItems = layoutManager.findFirstVisibleItemPosition();
            if (foundTotalPixel) {
                if (totalItemCount > 2) {
                    View headerView = layoutManager.getChildAt(0);
                    View itemView = layoutManager.getChildAt(1);

                    if (itemView != null && headerView != null) {
                        /*total visible scrolling part is total pixel's of total item's count and header view*/
                        totalPixel = /*-c.getTop() +*/ ((totalItemCount - 2) * itemView.getWidth()) + (1 * headerView.getWidth());
                        Log.v("...", "Total pixel x!" + totalPixel);
                        foundTotalPixel = false;
                    }
                }
            }

            //if (loading) {
            //if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
            if (!foundTotalPixel && totalMovedPixel >= totalPixel) {
                // loading = false;
                Log.v("...", "Last Item Wow !");
                Log.v("...", "totalMovedPixel !" + totalMovedPixel);

                // use this to turn auto-scrolling off:
                //mHandler.removeCallbacks(SCROLLING_RUNNABLE);
                marqueList.setAdapter(null);
                marqueList.setAdapter(new ScrollAdapter());
                pastVisiblesItems = visibleItemCount = totalItemCount = 0;
                totalMovedPixel = 0;

            }
        }
        // }
    });
    // use this to turn auto-scrolling on:
    mHandler.post(SCROLLING_RUNNABLE);
 }
}

<强>2。 SampleAdapter(ScrollAdapter.java)

package com.test.mo.test;

import android.support.v7.widget.RecyclerView;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;

/**
 * Created by jovin.pj on 29-07-2015.
 */
public class ScrollAdapter extends  RecyclerView.Adapter<RecyclerView.ViewHolder> {

private static final int TYPE_HEADER = 0;
private static final int TYPE_ITEM = 1;
private static final int TYPE_FOOTER = 2;


@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    RecyclerView.ViewHolder viewHolder = null;
    if (viewType == TYPE_ITEM) {
        //inflate your layout and pass it to view holder
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.scroll_child, parent, false);
        viewHolder = new ViewHolderItem(view);
    } else if (viewType == TYPE_HEADER || viewType == TYPE_FOOTER) {
        //inflate your layout and pass it to view holder
        //View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.header_footer, parent, false);
        View view = new View(parent.getContext());
        DisplayMetrics metrics = parent.getContext().getResources().getDisplayMetrics();
        int width = metrics.widthPixels;
        view.setLayoutParams(new LinearLayout.LayoutParams(width, LinearLayout.LayoutParams.WRAP_CONTENT));
        viewHolder = new ViewHolderHeaderOrFooter(view);
    }

    return viewHolder;
}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

}

@Override
public int getItemCount() {
    // 1 for header and 1 for footer
    return 4 + 1 + 1;
}

@Override
public int getItemViewType(int position) {
    if (isPositionHeader(position))
        return TYPE_HEADER;
    else if (isPositionFooter(position))
        return TYPE_FOOTER;
    return TYPE_ITEM;
}


private boolean isPositionHeader(int position) {
    return position == 0;
}

private boolean isPositionFooter(int position) {
    return position == getItemCount() - 1;
}


// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class ViewHolderItem extends RecyclerView.ViewHolder {
    // each data item is just a string in this case
    public View mView;
    public ViewHolderItem(View v) {
        super(v);
        mView = v;
    }
}

// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class ViewHolderHeaderOrFooter extends RecyclerView.ViewHolder {
    // each data item is just a string in this case
    public View mView;
    public ViewHolderHeaderOrFooter(View v) {
        super(v);
        mView = v;
    }
 }
}

3. Main Activity 的布局文件(main.xml)

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


 <android.support.v7.widget.RecyclerView
    android:id="@+id/marqueList"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dp"
    android:clipToPadding="false" />


</LinearLayout>

4.适配器的布局文件(scroll_child.xml)

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

<TextView
    android:id="@+id/txtPercent"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:paddingLeft="30dp"
    android:paddingRight="30dp"
    android:text="0.14%" />

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

<TextView
    android:id="@+id/txtData"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:paddingLeft="30dp"
    android:paddingRight="30dp"
    android:text="data" />

</LinearLayout>

增加或减少pixelsToMove，这个变量值改变速度

关于android - 线性布局的选框效果，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31471552/