android横向滑动选择的view

做文字编辑，从网上找来的。

HorizontalScrollSelectView：

    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 OnScrollListener mScrollListener;/*** 选中item时图片*/private Drawable mDrawable;private boolean mDataChanged = false;private Context context;private boolean scrollerFalg1 = false;private boolean scrollerFalg2 = false;private int position = 0x7f020000;public HorizontalScrollSelectView(Context context, AttributeSet attrs) {super(context, attrs);this.context = context;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);}public void setMScrollListener(OnScrollListener listener) {mScrollListener = listener;}@Overridepublic void setOnItemSelectedListener(OnItemSelectedListener listener) {mOnItemSelected = listener;}@Overridepublic void setOnItemClickListener(OnItemClickListener listener) {mOnItemClicked = listener;}@Overridepublic void setOnItemLongClickListener(OnItemLongClickListener listener) {mOnItemLongClicked = listener;}/*** 设置选中状态时的图片** @param mDrawable*/public void setSelectBitmap(Drawable mDrawable) {this.mDrawable = mDrawable;}private DataSetObserver mDataObserver = new DataSetObserver() {@Overridepublic void onChanged() {synchronized (HorizontalScrollSelectView.this) {mDataChanged = true;}invalidate();requestLayout();}@Overridepublic void onInvalidated() {reset();invalidate();requestLayout();}};@Overridepublic ListAdapter getAdapter() {return mAdapter;}@Overridepublic View getSelectedView() {//TODO: implementreturn null;}@Overridepublic void setAdapter(ListAdapter adapter) {if (mAdapter != null) {mAdapter.unregisterDataSetObserver(mDataObserver);}mAdapter = adapter;mAdapter.registerDataSetObserver(mDataObserver);reset();}private synchronized void reset() {initView();removeAllViewsInLayout();requestLayout();}@Overridepublic void setSelection(int position) {//TODO: implementint positionX = position * this.getWidth();int maxWidth = this.getChildCount() * this.getWidth();if (positionX <= 0) {positionX = 0;}if (positionX > maxWidth) {positionX = maxWidth;}scrollTo(positionX);}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));}@SuppressLint("NewApi")@Overrideprotected 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);
//		Log.e("onlayout", "mLeftViewIndex"+(mLeftViewIndex+1));mCurrentX = mNextX;if (!mScroller.isFinished()) {post(new Runnable() {@Overridepublic void run() {requestLayout();}});} else {if (scrollerFalg1 || (!scrollerFalg1 && scrollerFalg2)) {View chid = getChildAt(0);if (chid != null) {mDisplayOffset = 0;positionItems(0);if (mDrawable != null) {getChildAt(2).setBackground(mDrawable);}if (mScrollListener != null) {int position = (int) getChildAt(2).getTag(this.position);mScrollListener.onScrollSelectItem(this, position);}}}}}/*** 获取屏幕宽度** @param context* @return*/public static int getSecreenWidth(Context context) {DisplayMetrics dm = new DisplayMetrics();dm = context.getResources().getDisplayMetrics();int screenWidth = dm.widthPixels;return screenWidth / 5;}private void fillList(final int dx) {int edge = 0;View child = getChildAt(0);if (child != null) {edge = child.getLeft();}fillListLeft(edge, dx);edge = 0;child = getChildAt(getChildCount() - 1);if (child != null) {edge = child.getRight();}fillListRight(edge, dx);}private void fillListRight(int rightEdge, final int dx) {//&& mRightViewIndex < mAdapter.getCount()while (rightEdge + dx < getWidth()) {if (mRightViewIndex >= mAdapter.getCount()) {mRightViewIndex = 0;}View child = mAdapter.getView(mRightViewIndex, mRemovedViewQueue.poll(), this);child.setTag(position, mRightViewIndex);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) {//&& mLeftViewIndex >= 0while (leftEdge + dx > 0) {if (mLeftViewIndex <= -1) {mLeftViewIndex = mAdapter.getCount() - 1;}View child = mAdapter.getView(mLeftViewIndex, mRemovedViewQueue.poll(), this);child.setTag(position, mLeftViewIndex);addAndMeasureChild(child, 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++;if (mLeftViewIndex >= mAdapter.getCount()) {mLeftViewIndex = 0;}child = getChildAt(0);}child = getChildAt(getChildCount() - 1);while (child != null && child.getLeft() + dx >= getWidth()) {mRemovedViewQueue.offer(child);removeViewInLayout(child);mRightViewIndex--;if (mRightViewIndex <= -1) {mRightViewIndex = mAdapter.getCount() - 1;}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);getChildAt(2).setBackground(null);int childWidth = child.getMeasuredWidth();child.layout(left, 0, left + childWidth, child.getMeasuredHeight());left += childWidth + child.getPaddingRight();}}}public synchronized void scrollTo(int x) {mScroller.startScroll(mNextX, 0, x - mNextX, 0);requestLayout();}@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {boolean handled = super.dispatchTouchEvent(ev);handled |= mGesture.onTouchEvent(ev);switch (ev.getAction()) {case MotionEvent.ACTION_UP:scrollerFalg2 = true;requestLayout();break;default:break;}return handled;}protected boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {synchronized (HorizontalScrollSelectView.this) {//mNextXmScroller.fling(mNextX, 0, (int) -velocityX, 0, Integer.MIN_VALUE, mMaxX, 0, 0);}requestLayout();scrollerFalg1 = true;return true;}protected boolean onDown(MotionEvent e) {mScroller.forceFinished(true);return true;}public interface OnScrollListener {/*** 互动过程中选中的item** @param position*/public void onScrollSelectItem(ViewGroup viewGroup, int position);}private OnGestureListener mOnGesture = new GestureDetector.SimpleOnGestureListener() {@Overridepublic boolean onDown(MotionEvent e) {return HorizontalScrollSelectView.this.onDown(e);}@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {return HorizontalScrollSelectView.this.onFling(e1, e2, velocityX, velocityY);}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2,float distanceX, float distanceY) {synchronized (HorizontalScrollSelectView.this) {mNextX += (int) distanceX;}requestLayout();scrollerFalg1 = false;scrollerFalg2 = false;return true;}@Overridepublic void onShowPress(MotionEvent e) {super.onShowPress(e);}@Overridepublic boolean onSingleTapUp(MotionEvent e) {Log.e("onSingleTapUp", "mLeftViewIndex" + (mLeftViewIndex + 1));
//			scrollerFalg=true;return super.onSingleTapUp(e);}@Overridepublic boolean onSingleTapConfirmed(MotionEvent e) {for (int i = 0; i < getChildCount(); i++) {View child = getChildAt(i);if (isEventWithinView(e, child)) {if (mOnItemClicked != null) {mOnItemClicked.onItemClick(HorizontalScrollSelectView.this, child, mLeftViewIndex + 1 + i, mAdapter.getItemId(mLeftViewIndex + 1 + i));}if (mOnItemSelected != null) {mOnItemSelected.onItemSelected(HorizontalScrollSelectView.this, child, mLeftViewIndex + 1 + i, mAdapter.getItemId(mLeftViewIndex + 1 + i));}break;}}return true;}@Overridepublic 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(HorizontalScrollSelectView.this, child, 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, top, right, bottom);return viewRect.contains((int) e.getRawX(), (int) e.getRawY());}};</span>

demo截图：