package com.example.displaydemo;import java.util.ArrayList;import com.example.displaydemo.RotateCard.OnItemClickListener;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        RotateCard card = (RotateCard) findViewById(R.id.card);        ArrayList<View> views = new ArrayList<View>();        ImageView img;        img = new ImageView(MainActivity.this);        img.setImageResource(R.drawable.p1);        views.add(img);        img = new ImageView(MainActivity.this);        img.setImageResource(R.drawable.p2);        views.add(img);        img = new ImageView(MainActivity.this);        img.setImageResource(R.drawable.p3);        views.add(img);        img = new ImageView(MainActivity.this);        img.setImageResource(R.drawable.p4);        views.add(img);        img = new ImageView(MainActivity.this);        img.setImageResource(R.drawable.p5);        views.add(img);        img = new ImageView(MainActivity.this);        img.setImageResource(R.drawable.p6);        views.add(img);        // 传入view列表和view的宽高        card.commitViews(views, 200, 200);
　　　　 // 添加点击事件监听        card.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClickListener(View view, int index) {                // TODO Auto-generated method stub                Toast.makeText(MainActivity.this,                        "The " + index + " is clicked!", Toast.LENGTH_SHORT)                        .show();            }        });    }}

package com.example.displaydemo;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import android.animation.Animator;import android.animation.AnimatorListenerAdapter;import android.animation.AnimatorSet;import android.animation.ObjectAnimator;import android.animation.ValueAnimator;import android.animation.ValueAnimator.AnimatorUpdateListener;import android.content.Context;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.VelocityTracker;import android.view.View;import android.view.ViewTreeObserver;import android.view.animation.DecelerateInterpolator;import android.widget.FrameLayout;/** * RotateCard *  * @author 小明湖畔 *  * @Enail 463785757@qq.com *  * @time 2015-1-17 18:02 */public class RotateCard extends FrameLayout {    private static String INFO_TAG = "RotateCard";    private ArrayList<RotateCardViewHolder> viewHolderList;    private ArrayList<View> viewList;    private int ovalA, ovalB;// 椭圆轨迹的长半轴，短半轴    private int parentWidth, parentHeight;// RotateCard的宽高    private int viewWidth, viewHeight;// viewSet中的View的宽高    FrameLayout.LayoutParams viewpParams;// view的LayoutParams    private float angleOffset;// 手指每滑动一像素需要绕椭圆中心旋转的度数    private RotateCardOnTouchListener mTouchListener;// 供RotateCard和子View同时使用,处理滑动事件    // 增加绘制前的监听以获得RotateCard的宽高    private ViewTreeObserver.OnPreDrawListener onPreDrawListener = new ViewTreeObserver.OnPreDrawListener() {        @Override        public boolean onPreDraw() {            parentWidth = RotateCard.this.getMeasuredWidth();            parentHeight = RotateCard.this.getMeasuredHeight();            angleOffset = (float) ((180.0 / parentWidth) * 1.5);            // Log.i(INFO_TAG, "parentWidth:" + parentWidth);            // Log.i(INFO_TAG, "parentHeight:" + parentHeight);            // Log.i(INFO_TAG, "angleOffset:" + angleOffset);            if (viewList != null && viewList.size() > 0) {                afterGetParamsAndViews();            }            // 除去监听            RotateCard.this.getViewTreeObserver().removeOnPreDrawListener(                    onPreDrawListener);            return true;        }    };    public RotateCard(Context context) {        super(context);        // TODO Auto-generated constructor stub        init();    }    public RotateCard(Context context, AttributeSet attrs) {        super(context, attrs);        // TODO Auto-generated constructor stub        init();    }    public RotateCard(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        // TODO Auto-generated constructor stub        init();    }    private void init() {        // 增加RotateCard绘制之前的监听        RotateCard.this.getViewTreeObserver().addOnPreDrawListener(                onPreDrawListener);        // 增加RotateCard的滑动监听        mTouchListener = new RotateCardOnTouchListener();        this.setOnTouchListener(mTouchListener);    }    /**     * 必须保证传入的View集合的每个View的大小一致，否则显示可能不准确     *      * @param viewSet     *            View集合     */    public void commitViews(ArrayList<View> viewList, int viewWidth,            int viewHeight) {        this.removeAllViews();        this.viewList = viewList;        this.viewWidth = viewWidth;        this.viewHeight = viewHeight;        viewpParams = new LayoutParams(viewWidth, viewHeight);        // Log.i(INFO_TAG, "viewWidth:" + viewWidth);        // Log.i(INFO_TAG, "viewHeight:" + viewHeight);        if (parentWidth != 0 && parentHeight != 0) {            afterGetParamsAndViews();        }    }    /**     * 在获得RotateCard后并且调用过commitViews函数后,此函数被调用     */    private void afterGetParamsAndViews() {        ovalA = (parentWidth - viewWidth) / 2;        ovalB = (int) ((parentHeight - viewHeight * 1.5) / 2);        int viewNum = viewList.size();        float anglePerView = (float) (360.0 / viewNum);        // Log.i(INFO_TAG, "ovalA:" + ovalA);        // Log.i(INFO_TAG, "ovalB:" + ovalB);        // Log.i(INFO_TAG, "viewNum:" + viewNum);        // Log.i(INFO_TAG, "anglePerView:" + anglePerView);        if (viewHolderList == null) {            viewHolderList = new ArrayList<RotateCardViewHolder>();        } else {            viewHolderList.clear();        }        float tmpAngle = 270.0f;// 第一个view在270度的位置，即最前的位置        for (int i = 0; i < viewNum; ++i) {            int index = i + 1;            View view = viewList.get(i);            // 添加子view的滑动事件监听            view.setOnTouchListener(mTouchListener);            // 添加子view的点击事件监听            view.setOnClickListener(new ItemOnClickListener(index));            // 为子view创建一个RotateCardViewHolder            RotateCardViewHolder holder = new RotateCardViewHolder(view,                    tmpAngle, index);            // 将holder捆绑在子view上，方面从子view直接获取holder            view.setTag(holder);            viewHolderList.add(holder);            // 增加anglePerView的角度，用于确定下一个view的位置            tmpAngle += anglePerView;        }        // 把子view添加到RotateCard中        loadViewBySequence();    }    /**     * 把所有view旋转angleDiff的角度     *      * @param angleDiff     *            旋转的角度     */    private void rotateViewsByAngle(float angleDiff) {        // 若有动画在进行，则不进行旋转        if (set != null && set.isRunning()) {            return;        }        // 旋转每一个view        for (RotateCardViewHolder holder : viewHolderList) {            holder.setAngle(holder.getAngle() + angleDiff);        }        // 重新载入view以确保他们正确的遮挡关系        loadViewBySequence();    }    /**     * 通过对vew排序后重新把view添加到RotateCard中来决定他们的遮挡关系 ，越靠前的view越慢添加     */    private void loadViewBySequence() {        Collections.sort(viewHolderList, new RotateCardViewHolderComparator());        this.removeAllViews();        for (RotateCardViewHolder holder : viewHolderList) {            this.addView(holder.getView(), viewpParams);        }    }    /**     * 封装对view的一些操作     */    public class RotateCardViewHolder {        private View mView;        private float mAngle;        private int index;        public RotateCardViewHolder(View view, float angle, int index) {            this.mView = view;            this.mAngle = angle;            this.index = index;            setAngle(angle);        }        /**         * 设置位置和大小         */        public void resetPositionAndScale() {            // 设置大小            float angleDiff = getAngleDiffWith90();            float scale = (float) ((1.0 * angleDiff / 180) * 0.75 + 0.25);            mView.setScaleX(scale);            mView.setScaleY(scale);            // 设置位置            float x = (float) (ovalA * Math.cos(mAngle / 180.0 * Math.PI)                    + parentWidth / 2 - viewWidth / 2);            float y = (float) (parentHeight / 2 - ovalB                    * Math.sin(mAngle / 180.0 * Math.PI) - viewHeight / 2);            mView.setX(x);            mView.setY(y);        }        /**         * 设置view的角度，同时改变他的显示的大小和位置         *          * @param angle         *            view的角度         */        public void setAngle(float angle) {            // 保证mAngle在0~360之间            mAngle = angle;            while (mAngle < 0 || mAngle > 360) {                if (mAngle < 0) {                    mAngle = (mAngle + 360) % 360;                } else {                    mAngle = mAngle % 360;                }            }            resetPositionAndScale();        }        /**         * 获取view的角度         *          * @return view的角度         */        public float getAngle() {            return mAngle;        }        /**         * 获取view一开始的序号         *          * @return view的序号         */        public int getIndex() {            return index;        }        /**         * 获取view的实例         *          * @return view的实例         */        public View getView() {            return mView;        }        /**         * 获取该view当前位置跟90度位置相差的度数         *          * @return 跟90度相差的度数         */        public float getAngleDiffWith90() {            float tmpAngle = mAngle > 270 ? mAngle - 360 : mAngle;            float angleDiff = Math.abs(tmpAngle - 90);            return angleDiff;        }        /**         * 获取该view当前位置跟270度位置相差的度数         *          * @return 跟270度相差的度数         */        public float getAngleDiffWith270() {            float tmpAngle = mAngle < 90 ? mAngle + 360 : mAngle;            float angleDiff = Math.abs(tmpAngle - 270);            return angleDiff;        }    }    /**     * 比较器，用来把view按照度数越接近270度越靠后的顺序排序     *      */    public class RotateCardViewHolderComparator implements            Comparator<RotateCardViewHolder> {        @Override        public int compare(RotateCardViewHolder a, RotateCardViewHolder b) {            // TODO Auto-generated method stub            return a.getAngleDiffWith270() > b.getAngleDiffWith270() ? -1 : 1;        }    }    private float lastX, nowX;// 上次手指的x坐标位置和当前手指的x坐标位置    private VelocityTracker vTracker;// 监控手指滑动的使用率    private AnimatorSet set;// 动画集    private boolean justCancelAnimation = false;// 是否刚刚通过点击屏幕使正在进行的动画取消,用于取消动画的同事发生的点击事件    @Override    public boolean dispatchTouchEvent(MotionEvent event) {        int action = event.getAction();        switch (action) {        case MotionEvent.ACTION_DOWN: {            // 若动画正在进行，则取消动画            if (set != null && set.isRunning()) {                set.cancel();                set = null;                justCancelAnimation = true;            }            // 获取VelocityTracker的一个实例            vTracker = VelocityTracker.obtain();            // 记录lastX            lastX = event.getX();        }            break;        case MotionEvent.ACTION_MOVE: {            justCancelAnimation = false;            // 把动作送到vTracker            vTracker.addMovement(event);            // 记录nowX            nowX = event.getX();        }            break;        case MotionEvent.ACTION_UP: {            if (justCancelAnimation) {                justCancelAnimation = false;                return true;// 用来取消点击事件            }            // 设置计算单元，为1秒            vTracker.computeCurrentVelocity(1000);            // 获取在x轴方向1秒内划过的像素数            float xSpeed = vTracker.getXVelocity();            // 活动过快，则执行动画，让RotateCard再旋转一会才停下            if (Math.abs(xSpeed) > 800.0f) {                // 还要旋转的角度                float angleDiff = xSpeed / 10;                // 还要旋转的时间                int duration = (int) (Math.abs(angleDiff) / 180 * 1000);                // 设置动画集                set = new AnimatorSet();                ValueAnimator animation = ValueAnimator.ofFloat(0f, 1f)                        .setDuration(duration);                animation.addUpdateListener(new AnimatorUpdateListener() {                    @Override                    public void onAnimationUpdate(ValueAnimator animation) {                        // TODO Auto-generated method stub                        loadViewBySequence();                    }                });                set.play(animation);                for (RotateCardViewHolder _holder : viewHolderList) {                    ObjectAnimator oa = ObjectAnimator.ofFloat(_holder,                            "angle", _holder.getAngle(),                            _holder.getAngle() + angleDiff).setDuration(                            duration);                    oa.setInterpolator(new DecelerateInterpolator());                    set.play(oa).with(animation);                }                // 开始动画集合                set.start();            }        }            break;        }        return super.dispatchTouchEvent(event);    }    private class RotateCardOnTouchListener implements OnTouchListener {        @Override        public boolean onTouch(View v, MotionEvent event) {            // TODO Auto-generated method stub            int action = event.getAction();            switch (action) {            case MotionEvent.ACTION_DOWN: {            }                break;            case MotionEvent.ACTION_MOVE: {                // 此次手指滑动需要旋转的度数                float angleDiff = (nowX - lastX) * angleOffset;                // 旋转angleDiff的角度                rotateViewsByAngle(angleDiff);                // 记录lastX                lastX = nowX;            }                break;            case MotionEvent.ACTION_UP: {            }                break;            }            if (v instanceof RotateCard) {                // 若是手指的位置是RotateCard，返回true让事件继续传递给RotateCard                return true;            } else {                // 若是手指的位置是子view，返回false让子view的点击事件可以响应                return false;            }        }    }    public class ItemOnClickListener implements OnClickListener {        private int index;        public ItemOnClickListener(int index) {            this.index = index;        }        /**         * * 把被点击的view旋转的最前面         */        @Override        public void onClick(View v) {            // TODO Auto-generated method stub            final View tView = v;            final RotateCardViewHolder holder = (RotateCardViewHolder) v                    .getTag();            float angle = holder.getAngle();            // 需要旋转的度数            float angleDiff = angle >= 0.0f && angle <= 90.0f ? -90.0f - angle                    : 270.0f - angle;            // 是否子执行view的点击事件(若被点击view在很靠前，则旋转后执行它的点击事件)            final boolean performClick = Math.abs(angleDiff) < 45.0f;            int duration = (int) (Math.abs(angleDiff) / 180 * 1000);            // 初始化动画集            set = new AnimatorSet();            ValueAnimator animation = ValueAnimator.ofFloat(0f, 1f)                    .setDuration(duration);            animation.addUpdateListener(new AnimatorUpdateListener() {                @Override                public void onAnimationUpdate(ValueAnimator animation) {                    // TODO Auto-generated method stub                    loadViewBySequence();                }            });            set.play(animation);            if (performClick) {                ObjectAnimator aa = ObjectAnimator.ofFloat(tView, "alpha",                        1.0f, 0.5f, 1.0f).setDuration(800);                ObjectAnimator saX = ObjectAnimator.ofFloat(tView, "scaleX",                        1.0f, 1.5f, 1.0f).setDuration(800);                ObjectAnimator saY = ObjectAnimator.ofFloat(tView, "scaleY",                        1.0f, 1.5f, 1.0f).setDuration(800);                set.play(aa).with(animation);                set.play(saX).with(animation);                set.play(saY).with(animation);            }            for (RotateCardViewHolder _holder : viewHolderList) {                ObjectAnimator oa = ObjectAnimator.ofFloat(_holder, "angle",                        _holder.getAngle(), _holder.getAngle() + angleDiff)                        .setDuration(duration);                oa.setInterpolator(new DecelerateInterpolator());                set.play(oa).with(animation);            }            set.addListener(new AnimatorListenerAdapter() {                @Override                public void onAnimationEnd(Animator animation) {                    // TODO Auto-generated method stub                    if (mOnItemClickListener != null && performClick) {                        // 执行外部设置的点击事件                        mOnItemClickListener.onItemClickListener(tView, index);                    }                }                @Override                public void onAnimationCancel(Animator animation) {                    // TODO Auto-generated method stub                    tView.setAlpha(1.0f);                    holder.resetPositionAndScale();                }            });            set.start();        }    }    /**     * 子view点击事件监听器OnItemClickListener     *      * RotateCard内部需要自行处理子vew的点击事件，OnItemClickListener监听器供外部代码使用     */    public interface OnItemClickListener {        public void onItemClickListener(View view, int index);    }    private OnItemClickListener mOnItemClickListener;    /**     * 添加子view点击事件监听     *      * @param onItemClickListener     */    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {        this.mOnItemClickListener = onItemClickListener;    }}