android横向滑动选择的view

来源：互联网发布：ifunbox中文版 mac 编辑：程序博客网时间：2024/05/21 10:51

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;    }    @Override    public void setOnItemSelectedListener(OnItemSelectedListener listener) {        mOnItemSelected = listener;    }    @Override    public void setOnItemClickListener(OnItemClickListener listener) {        mOnItemClicked = listener;    }    @Override    public 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() {        @Override        public void onChanged() {            synchronized (HorizontalScrollSelectView.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        int 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")    @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);//Log.e("onlayout", "mLeftViewIndex"+(mLeftViewIndex+1));        mCurrentX = mNextX;        if (!mScroller.isFinished()) {            post(new Runnable() {                @Override                public 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 >= 0        while (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();    }    @Override    public 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) {            //mNextX            mScroller.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() {        @Override        public boolean onDown(MotionEvent e) {            return HorizontalScrollSelectView.this.onDown(e);        }        @Override        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,                               float velocityY) {            return HorizontalScrollSelectView.this.onFling(e1, e2, velocityX, velocityY);        }        @Override        public boolean onScroll(MotionEvent e1, MotionEvent e2,                                float distanceX, float distanceY) {            synchronized (HorizontalScrollSelectView.this) {                mNextX += (int) distanceX;            }            requestLayout();            scrollerFalg1 = false;            scrollerFalg2 = false;            return true;        }        @Override        public void onShowPress(MotionEvent e) {            super.onShowPress(e);        }        @Override        public boolean onSingleTapUp(MotionEvent e) {            Log.e("onSingleTapUp", "mLeftViewIndex" + (mLeftViewIndex + 1));//scrollerFalg=true;            return super.onSingleTapUp(e);        }        @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(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;        }        @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(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：

demo地址：http://download.csdn.net/detail/s569646547/9070919

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