自定义HorizontalScrollView嵌套HorizontalListView实现手势监听、按钮监听横向滚动功能

今日空闲花了点时间对以前自主实现的项目功能进行改进和优化， 其实一些界面的小功能有时候没实现过，也没经验类似项目功能经验，反而耗费的时间会更多。下面我所描述的界面功能就是我在对用RecyclerView控件不熟悉的情况下使用了HorizontalScrollView来实现的，在我把它优化成RecyclerView控件之前在此做个笔录，方便以后查阅。

按照以往的惯例，先上效果图（既可以手势监听，也可以按钮监听）

1.HorizontalScrollView滑动到最左边的时候，左边箭头光标变灰色



2.HorizontalScrollView滑动到不是最左边也不是最右边的时候，左右两边箭头光标都是较深的灰色



3.HorizontalScrollView滑动到最右边的时候，右边箭头光标变灰色



首先要明确实现的界面功能是：自定义HorizontalScrollView嵌套HorizontalListView实现手势监听、按钮监听滑动。

此处给大家一个自定义HorizontalListView开源库的链接地址：http://pan.baidu.com/s/1dENbGIH（开源库也是我当初从谷歌下载的，那就借此篇文章感谢一下这位开源库的作者，当初是他这个开源库封装得比较好帮助我实现了这个项目所需功能）

有了HorizontalListView开源库，接下去一切事情都好办了，首先需要一个自定义HorizontalScrollView，附上代码：

(参考来自：http://www.cnblogs.com/java-koma/archive/2012/11/02/2751594.html)

public class MyHorizontalScrollView extends HorizontalScrollView
{
private Runnable scrollerTask;
private int intitPosition;
private int newCheck = 100;
private int childWidth = 0;

public interface OnScrollStopListner
{
/**
* scroll have stoped
*/
void onScrollStoped();

/**
* scroll have stoped, and is at left edge
*/
void onScrollToLeftEdge();

/**
* scroll have stoped, and is at right edge
*/
void onScrollToRightEdge();

/**
* scroll have stoped, and is at middle
*/
void onScrollToMiddle();
}

private OnScrollStopListner onScrollstopListner;

public MyHorizontalScrollView(Context context, AttributeSet attrs)
{
super(context, attrs);
scrollerTask = new Runnable()
{
@Override
public void run()
{
int newPosition = getScrollX();
if (intitPosition - newPosition == 0)
{
if (onScrollstopListner == null)
{
return;
}
onScrollstopListner.onScrollStoped();
Rect outRect = new Rect();
getDrawingRect(outRect);
if (getScrollX() == 0)
{
onScrollstopListner.onScrollToLeftEdge();
} else if (childWidth + getPaddingLeft() + getPaddingRight() == outRect.right)
{
onScrollstopListner.onScrollToRightEdge();
} else
{
onScrollstopListner.onScrollToMiddle();
}
} else
{
intitPosition = getScrollX();
postDelayed(scrollerTask, newCheck);
}
}
};
}

public void setOnScrollStopListner(OnScrollStopListner listner)
{
onScrollstopListner = listner;
}

public void startScrollerTask()
{
intitPosition = getScrollX();
postDelayed(scrollerTask, newCheck);
checkTotalWidth();
}

private void checkTotalWidth()
{
if (childWidth > 0)
{
return;
}
for (int i = 0; i < getChildCount(); i++)
{
childWidth += getChildAt(i).getWidth();
}
}

}

接下去写xml布局文件：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/color_fff_white" >

<LinearLayout
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@color/color_f9"
android:gravity="center_vertical" >

<RelativeLayout
android:id="@+id/rl_news_back"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center" >

<ImageView
android:id="@+id/img_news_back"
android:layout_width="30dp"
android:layout_height="wrap_content"
android:visibility="gone"
android:src="@drawable/back"/>

<ImageView
android:id="@+id/img_news_back_pre"
android:layout_width="30dp"
android:layout_height="wrap_content"
android:src="@drawable/left_gray" />

</RelativeLayout>

<com.example.custom.MyHorizontalScrollView
android:id="@+id/horizontalScrollView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.50"
android:scrollbars="none" >

<LinearLayout
android:layout_width="match_parent"
android:layout_height="75dp"
android:orientation="horizontal" >

<com.meetme.android.horizontallistview.HorizontalListView
android:id="@+id/head_horizontalView"
android:layout_width="880dp"
android:layout_height="75dp">
</com.meetme.android.horizontallistview.HorizontalListView>
</LinearLayout>
</com.example.custom.MyHorizontalScrollView>

<RelativeLayout
android:id="@+id/rl_news_enter"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:gravity="center" >

<ImageView
android:id="@+id/img_news_enter"
android:layout_width="30dp"
android:layout_height="wrap_content"
android:src="@drawable/goenter" />

<ImageView
android:id="@+id/img_news_enter_pre"
android:layout_width="30dp"
android:visibility="gone"
android:layout_height="wrap_content"
android:src="@drawable/right_gray" />
</RelativeLayout>
</LinearLayout>

</RelativeLayout>

好了，一切都准备就绪以后，接下去就是MainActivity.java的主要代码了，也是比较简单的
1.适配器代码

//TODO  水平ListViewAdapter
class HorizontalListViewAdapter extends BaseAdapter{

@Override
public int getCount() {
return mHorizontalData.size();
}

@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) {
View layout = null;
ViewHolder vh = null;
if (convertView == null)
{
vh = new ViewHolder();
layout = getLayoutInflater().inflate(R.layout.list_item_horizontallistview, null);
vh.HorizontalLv_im=(ImageView)layout.findViewById(R.id.financail_item_imageView);
vh.HorizontalLv_title=(TextView)layout.findViewById(R.id.financail_item_textView);
layout.setTag(vh);
} else
{
layout = convertView;// convertView 不为空 复用消失的行数
vh = (ViewHolder) layout.getTag();// 得到标签 口袋
}

HomeData homeData = mHorizontalData.get(position);
vh.HorizontalLv_title.setText(homeData.getTitle());
vh.HorizontalLv_im.setImageResource(homeData.getImg());

return layout;
}
}

//TODO 创建一个查找的类 目的是减少查找次数 无需每次都重复查找
<span style="white-space:pre">	</span>public static class ViewHolder
<span style="white-space:pre">	</span>{
<span style="white-space:pre">		</span>public ImageView HorizontalLv_im;
<span style="white-space:pre">		</span>public TextView HorizontalLv_title;
<span style="white-space:pre">	</span>}

其中HomeData是自定义的一个listview数据优化类，大家可以根据listview的item需求来确定这个类的内容即可，非常简单，此处我就不贴代码了

onCreate的代码：

hlv = (HorizontalListView) findViewById(R.id.head_horizontalView);

horizontalScrollView = (MyHorizontalScrollView) findViewById(R.id.horizontalScrollView1);
rl_news_back = (RelativeLayout) head_financial_news_headtwo.findViewById(R.id.rl_news_back);
rl_news_enter = (RelativeLayout) head_financial_news_headtwo.findViewById(R.id.rl_news_enter);
img_news_back = (ImageView) head_financial_news_headtwo.findViewById(R.id.img_news_back);
img_news_back_pre = (ImageView) head_financial_news_headtwo.findViewById(R.id.img_news_back_pre);
img_news_enter = (ImageView) head_financial_news_headtwo.findViewById(R.id.img_news_enter);
img_news_enter_pre = (ImageView) head_financial_news_headtwo.findViewById(R.id.img_news_enter_pre);

hlva = new HorizontalListViewAdapter();
hlva.notifyDataSetChanged();
hlv.setAdapter(hlva);

<pre name="code" class="html">                clickHorizontalListview()

<pre name="code" class="html">private void clickHorizontalListview()
{
hlv.setOnItemClickListener(new OnItemClickListener()
{

@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
tv_tilte.setText(mHorizontalData.get(position).getTitle());
select_item1 = position; //当前选择的节目item
hlva.notifyDataSetChanged();
}
});

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

//如果触动屏幕就执行
if (event.getAction() == MotionEvent.ACTION_UP)
{
horizontalScrollView.startScrollerTask();
}
return false;

}
});

horizontalScrollView.setOnScrollStopListner(new OnScrollStopListner()
{
public void onScrollToRightEdge()
{
img_news_back.setVisibility(View.VISIBLE);
img_news_back_pre.setVisibility(View.GONE);
img_news_enter.setVisibility(View.GONE);
img_news_enter_pre.setVisibility(View.VISIBLE);
}
public void onScrollToMiddle()
{
img_news_back.setVisibility(View.VISIBLE);
img_news_back_pre.setVisibility(View.GONE);
img_news_enter.setVisibility(View.VISIBLE);
img_news_enter_pre.setVisibility(View.GONE);
}
public void onScrollToLeftEdge()
{
img_news_back.setVisibility(View.GONE);
img_news_back_pre.setVisibility(View.VISIBLE);
img_news_enter.setVisibility(View.VISIBLE);
img_news_enter_pre.setVisibility(View.GONE);
}
public void onScrollStoped()
{
}
});

rl_news_back.setOnClickListener(new OnClickListener()
{

@Override
public void onClick(View v)
{
horizontalScrollView.smoothScrollBy(-( getWindowManager().getDefaultDisplay().getWidth()-rl_news_back.getWidth()*2),0);
horizontalScrollView.startScrollerTask();
}
});

rl_news_enter.setOnClickListener(new OnClickListener()
{

@Override
public void onClick(View v)
{
horizontalScrollView.startScrollerTask();
horizontalScrollView.smoothScrollBy(getWindowManager().getDefaultDisplay().getWidth()-rl_news_back.getWidth()*2,0);
}
});
}

大神勿喷~欢迎大家指导改正