Android中实现水平滑动（横向滑动）ListView示例

概述水平的ListView-HorizontalListView的使用Android中ListView默认的是竖直方向的滑动，由于项目的需求，需要ListView是水平滑动的。有很多的方式可以实现，但是比较好的一种方式就是自己封装一个控件，使用方式和Lis

水平的ListVIEw-horizontallistVIEw的使用

AndroID中ListVIEw默认的是竖直方向的滑动，由于项目的需求，需要ListVIEw是水平滑动的。有很多的方式可以实现，但是比较好的一种方式就是自己封装一个控件，使用方式和ListVIEw的使用方式是一样的。需要完善的地方：获取到的图片大小没有处理。在界面上展示的是图片的原大小。为了更好的展示效果，应该压缩成统一的尺寸。

horizontallistVIEw.java 代码如下：

/** * 横向的ListVIEw *  * * @author scd *  */public class horizontallistVIEw extends AdapterVIEw<listadapter> {  public boolean mAlwaysOverrIDetouch = true;  protected listadapter mAdapter;  private int mleftVIEwIndex = -1;  private int mRightVIEwIndex = 0;  protected int mCurrentX;  protected int mNextX;  private int mMaxX = Integer.MAX_VALUE;  private int mdisplayOffset = 0;  protected Scroller mScroller;  private GestureDetector mGesture;  private Queue<VIEw> mRemovedVIEwQueue = new linkedList<VIEw>();  private OnItemSelectedListener mOnItemSelected;  private OnItemClickListener mOnItemClicked;  private OnItemLongClickListener mOnItemLongClicked;  private boolean mDataChanged = false;  public horizontallistVIEw(Context context,AttributeSet attrs) {    super(context,attrs);    initVIEw();  }  private synchronized voID initVIEw() {    mleftVIEwIndex = -1;    mRightVIEwIndex = 0;    mdisplayOffset = 0;    mCurrentX = 0;    mNextX = 0;    mMaxX = Integer.MAX_VALUE;    mScroller = new Scroller(getContext());    mGesture = new GestureDetector(getContext(),mOnGesture);  }  @OverrIDe  public voID setonItemSelectedListener(      AdapterVIEw.OnItemSelectedListener Listener) {    mOnItemSelected = Listener;  }  @OverrIDe  public voID setonItemClickListener(AdapterVIEw.OnItemClickListener Listener) {    mOnItemClicked = Listener;  }  @OverrIDe  public voID setonItemLongClickListener(      AdapterVIEw.OnItemLongClickListener Listener) {    mOnItemLongClicked = Listener;  }  private DataSetobserver mDataObserver = new DataSetobserver() {    @OverrIDe    public voID onChanged() {      synchronized (horizontallistVIEw.this) {        mDataChanged = true;      }      invalIDate();      requestLayout();    }    @OverrIDe    public voID onInvalIDated() {      reset();      invalIDate();      requestLayout();    }  };  @OverrIDe  public listadapter getAdapter() {    return mAdapter;  }  @OverrIDe  public VIEw getSelectedVIEw() {    // Todo: implement    return null;  }  @OverrIDe  public voID setAdapter(listadapter adapter) {    if (mAdapter != null) {      mAdapter.unregisterDataSetobserver(mDataObserver);    }    mAdapter = adapter;    mAdapter.registerDataSetobserver(mDataObserver);    reset();  }  private synchronized voID reset() {    initVIEw();    removeAllVIEwsInLayout();    requestLayout();  }  @OverrIDe  public voID setSelection(int position) {    // Todo: implement  }  private voID addAndMeasureChild(final VIEw child,int vIEwPos) {    LayoutParams params = child.getLayoutParams();    if (params == null) {      params = new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);    }    addVIEwInLayout(child,vIEwPos,params,true);    child.measure(        MeasureSpec.makeMeasureSpec(getWIDth(),MeasureSpec.AT_MOST),MeasureSpec.makeMeasureSpec(getHeight(),MeasureSpec.AT_MOST));  }  @OverrIDe  protected synchronized voID onLayout(boolean changed,int left,int top,int right,int bottom) {    super.onLayout(changed,left,top,right,bottom);    if (mAdapter == null) {      return;    }    if (mDataChanged) {      int oldCurrentX = mCurrentX;      initVIEw();      removeAllVIEwsInLayout();      mNextX = oldCurrentX;      mDataChanged = false;    }    if (mScroller.computeScrollOffset()) {      int scrollx = mScroller.getCurrX();      mNextX = scrollx;    }    if (mNextX <= 0) {      mNextX = 0;      mScroller.forceFinished(true);    }    if (mNextX >= mMaxX) {      mNextX = mMaxX;      mScroller.forceFinished(true);    }    int dx = mCurrentX - mNextX;    removeNonVisibleItems(dx);    fillList(dx);    positionItems(dx);    mCurrentX = mNextX;    if (!mScroller.isFinished()) {      post(new Runnable() {        @OverrIDe        public voID run() {          requestLayout();        }      });    }  }  private voID fillList(final int dx) {    int edge = 0;    VIEw child = getChildAt(getChildCount() - 1);    if (child != null) {      edge = child.getRight();    }    fillListRight(edge,dx);    edge = 0;    child = getChildAt(0);    if (child != null) {      edge = child.getleft();    }    fillListleft(edge,dx);  }  private voID fillListRight(int rightEdge,final int dx) {    while (rightEdge + dx < getWIDth()        && mRightVIEwIndex < mAdapter.getCount()) {      VIEw child = mAdapter.getVIEw(mRightVIEwIndex,mRemovedVIEwQueue.poll(),this);      addAndMeasureChild(child,-1);      rightEdge += child.getMeasureDWIDth();      if (mRightVIEwIndex == mAdapter.getCount() - 1) {        mMaxX = mCurrentX + rightEdge - getWIDth();      }      if (mMaxX < 0) {        mMaxX = 0;      }      mRightVIEwIndex++;    }  }  private voID fillListleft(int leftEdge,final int dx) {    while (leftEdge + dx > 0 && mleftVIEwIndex >= 0) {      VIEw child = mAdapter.getVIEw(mleftVIEwIndex,0);      leftEdge -= child.getMeasureDWIDth();      mleftVIEwIndex--;      mdisplayOffset -= child.getMeasureDWIDth();    }  }  private voID removeNonVisibleItems(final int dx) {    VIEw child = getChildAt(0);    while (child != null && child.getRight() + dx <= 0) {      mdisplayOffset += child.getMeasureDWIDth();      mRemovedVIEwQueue.offer(child);      removeVIEwInLayout(child);      mleftVIEwIndex++;      child = getChildAt(0);    }    child = getChildAt(getChildCount() - 1);    while (child != null && child.getleft() + dx >= getWIDth()) {      mRemovedVIEwQueue.offer(child);      removeVIEwInLayout(child);      mRightVIEwIndex--;      child = getChildAt(getChildCount() - 1);    }  }  private voID positionItems(final int dx) {    if (getChildCount() > 0) {      mdisplayOffset += dx;      int left = mdisplayOffset;      for (int i = 0; i < getChildCount(); i++) {        VIEw child = getChildAt(i);        int chilDWIDth = child.getMeasureDWIDth();        child.layout(left,left + chilDWIDth,child.getMeasuredHeight());        left += chilDWIDth + child.getpaddingRight();      }    }  }  public synchronized voID scrollTo(int x) {    mScroller.startScroll(mNextX,x - mNextX,0);    requestLayout();  }  @OverrIDe  public boolean dispatchtouchEvent(MotionEvent ev) {    boolean handled = super.dispatchtouchEvent(ev);    handled |= mGesture.ontouchEvent(ev);    return handled;  }  protected boolean onFling(MotionEvent e1,MotionEvent e2,float veLocityX,float veLocityY) {    synchronized (horizontallistVIEw.this) {      mScroller.fling(mNextX,(int) -veLocityX,mMaxX,0);    }    requestLayout();    return true;  }  protected boolean onDown(MotionEvent e) {    mScroller.forceFinished(true);    return true;  }  private OnGestureListener mOnGesture = new GestureDetector.SimpleOnGestureListener() {    @OverrIDe    public boolean onDown(MotionEvent e) {      return horizontallistVIEw.this.onDown(e);    }    @OverrIDe    public boolean onFling(MotionEvent e1,float veLocityY) {      return horizontallistVIEw.this          .onFling(e1,e2,veLocityX,veLocityY);    }    @OverrIDe    public boolean onScroll(MotionEvent e1,float distanceX,float distanceY) {      synchronized (horizontallistVIEw.this) {        mNextX += (int) distanceX;      }      requestLayout();      return true;    }    @OverrIDe    public boolean onSingleTapConfirmed(MotionEvent e) {      for (int i = 0; i < getChildCount(); i++) {        VIEw child = getChildAt(i);        if (isEventWithinVIEw(e,child)) {          if (mOnItemClicked != null) {            mOnItemClicked.onItemClick(horizontallistVIEw.this,child,mleftVIEwIndex + 1 + i,mAdapter.getItemID(mleftVIEwIndex + 1 + i));          }          if (mOnItemSelected != null) {            mOnItemSelected.onItemSelected(horizontallistVIEw.this,mAdapter.getItemID(mleftVIEwIndex + 1 + i));          }          break;        }      }      return true;    }    @OverrIDe    public voID onLongPress(MotionEvent e) {      int childCount = getChildCount();      for (int i = 0; i < childCount; i++) {        VIEw child = getChildAt(i);        if (isEventWithinVIEw(e,child)) {          if (mOnItemLongClicked != null) {            mOnItemLongClicked.onItemLongClick(                horizontallistVIEw.this,mleftVIEwIndex                    + 1 + i,mAdapter.getItemID(mleftVIEwIndex + 1 + i));          }          break;        }      }    }    private boolean isEventWithinVIEw(MotionEvent e,VIEw child) {      Rect vIEwRect = new Rect();      int[] childposition = new int[2];      child.getLocationOnScreen(childposition);      int left = childposition[0];      int right = left + child.getWIDth();      int top = childposition[1];      int bottom = top + child.getHeight();      vIEwRect.set(left,bottom);      return vIEwRect.contains((int) e.getRawX(),(int) e.getRawY());    }  };}

适配器 horizontallistVIEwAdapter .java如下：

public class horizontallistVIEwAdapter extends BaseAdapter {  /** 上下文 */  private Context mContext;  /** 图像数据源 */  private ArrayList<Map<String,Integer>> mImageList;  /** 数据源 */  private ArrayList<Map<String,Integer>> mTextList;  /** Image */  private static String IMAGE = "ic_";  private Map<String,Integer> mMap = null;  /** 构造方法 */  public horizontallistVIEwAdapter(Context context) {    this.mContext = context;    initData();  }  /** 初始化数据 */  public voID initData() {    mImageList = new ArrayList<Map<String,Integer>>();    /*     * 反射技术     */    Class<?> imageClzz = R.drawable.class;    R.drawable instance = new R.drawable();    // 取得drawable类中所有的字段    FIEld[] fIElds = imageClzz.getDeclaredFIElds();    for (FIEld fIEld : fIElds) {      // 获得字段的名字      String name = fIEld.getname();      if (name != null && name.startsWith(IMAGE)) {        try {          mMap = new HashMap<String,Integer>();          mMap.put(IMAGE,(Integer) fIEld.get(instance));          mImageList.add(mMap);        } catch (illegalaccessexception e) {          e.printstacktrace();        }      }    }  }  @OverrIDe  public int getCount() {    return mImageList.size();  }  @OverrIDe  public Map<String,Integer> getItem(int position) {    return mImageList == null ? null : mImageList.get(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 = LayoutInflater.from(mContext).inflate(          R.layout.horizontal_List_item,null);      holder.mImage = (ImageVIEw) convertVIEw          .findVIEwByID(R.ID.iv_List_item);      holder.mTitle = (TextVIEw) convertVIEw          .findVIEwByID(R.ID.tv_List_item);      convertVIEw.setTag(holder);    } else {      holder = (VIEwHolder) convertVIEw.getTag();    }    if (position == mSelectIndex) {      convertVIEw.setSelected(true);    } else {      convertVIEw.setSelected(false);    }    holder.mImage.setimageResource(getItem(position).get(IMAGE));    return convertVIEw;  }  private class VIEwHolder {    /** 图像 */    private ImageVIEw mImage;  }}

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