1、修改切换item的时间

public class FixedSpeedScroller extends Scroller {          private int mDuration = 300;                public FixedSpeedScroller(Context context) {              super(context);          }                public FixedSpeedScroller(Context context, android.view.animation.Interpolator interpolator) {              super(context, interpolator);          }                public FixedSpeedScroller(Context context, android.view.animation.Interpolator interpolator, boolean flywheel) {              super(context, interpolator, flywheel);          }                      @Override          public void startScroll(int startX, int startY, int dx, int dy, int duration) {              super.startScroll(startX, startY, dx, dy, mDuration);          }                @Override          public void startScroll(int startX, int startY, int dx, int dy) {              super.startScroll(startX, startY, dx, dy, mDuration);          }      }

private void setViewPagerScrollSpeed(){          try {              Field mScroller = null;              mScroller = ViewPager.class.getDeclaredField("mScroller");              if(mScroller != null){                mScroller.setAccessible(true);                   FixedSpeedScroller scroller = new FixedSpeedScroller( getContext(), new LinearInterpolator());                  mScroller.set(mUserInfoViewPager, scroller);              }        }catch(NoSuchFieldException e){                        }catch (IllegalArgumentException e){                        }catch (IllegalAccessException e){                        }      }

2、修改Item的切换动画

mUserInfoViewPager.setPageTransformer(true, new PageTransformer() {                         private static final float MIN_SCALE = 0.85f;              private static final float MIN_ALPHA = 0.5f;                         @Override            public void transformPage(View view, float position) {                //                 int pageWidth = view.getWidth();                  int pageHeight = view.getHeight();                                          if (position < -1)  {                                          view.setAlpha(0);                            } else if (position <= 1) {                     //a页滑动至b页 ； a页从 0.0 -1 ；b页从1 ~ 0.0                     // [-1,1]                      // Modify the default slide transition to shrink the page as well                      float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));                      float vertMargin = pageHeight * (1 - scaleFactor) / 2;                      float horzMargin = pageWidth * (1 - scaleFactor) / 2;                      if (position < 0){                          view.setTranslationX(horzMargin - vertMargin / 2);                      } else  {                          view.setTranslationX(-horzMargin + vertMargin / 2);                      }                                // Scale the page down (between MIN_SCALE and 1)                      view.setScaleX(scaleFactor);                      view.setScaleY(scaleFactor);                                // Fade the page relative to its size.                      view.setAlpha(MIN_ALPHA + (scaleFactor - MIN_SCALE)/ (1 - MIN_SCALE) * (1 - MIN_ALPHA));                            } else  { // (1,+Infinity]                      // This page is way off-screen to the right.                      view.setAlpha(0);                  }                              }        });

3、ViewPager实现Gallery类似效果

package com.joyodream.pingo.near.ui;import java.lang.reflect.Field;import android.content.Context;import android.graphics.Camera;import android.graphics.Matrix;import android.support.v4.view.ViewPager;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.animation.AccelerateDecelerateInterpolator;import android.view.animation.LinearInterpolator;import android.view.animation.Transformation;import android.widget.Scroller;import com.joyodream.common.util.DipPixelUtil;/** *  * 自定义的展示图片的控件 * 通过Camera 调整z轴距离，实现图片放大缩小 *  * 注意： * 1、为了实现在屏幕上面看到多个Item，需要在滑动的过程中刷新父控件 * 2、另外，通过设置clipChildren = false，不去裁剪子控件的绘图区域 * 3、 *  * @author lipeilong *  */public class NearViewPager extends ViewPager {    /**     * The camera class is used to 3D transformation matrix.     */    private Camera mCamera = new Camera();        /**     * The max zoom value (Z axis).     */    private int mMaxZoom     = -120;        private int mMaxAlpha    = 0x8f;    private OnPageChangeListener mScrollListener;        private int mScrollPosition;        private int mScrollOffset;    public int mCurPosition;    private float mDownX;    private float mDownY;    private boolean mClick;        public NearViewPager(Context context, AttributeSet attrs) {        super(context, attrs);        //        init();    }    public NearViewPager(Context context) {        super(context);        //        init();    }    private void init() {        // Enable set transformation.        this.setStaticTransformationsEnabled(true);        // Enable set the children drawing order.        this.setChildrenDrawingOrderEnabled(true);                this.setOverScrollMode(ViewPager.OVER_SCROLL_NEVER);        super.setOnPageChangeListener(new MyOnPageChangeListener());                    setViewPagerScrollSpeed();    }        private void setViewPagerScrollSpeed(){          try {              Field mScroller = null;              mScroller = ViewPager.class.getDeclaredField("mScroller");              if(mScroller != null){                mScroller.setAccessible(true);                   FixedSpeedScroller scroller = new FixedSpeedScroller( getContext(), new LinearInterpolator());                  mScroller.set(this, scroller);              }        }catch(NoSuchFieldException e){                        }catch (IllegalArgumentException e){                        }catch (IllegalAccessException e){                        }      }    @Override    protected int getChildDrawingOrder(int childCount, int i) {        // Current selected index.        int selectedIndex = getCurrentItem();        if (selectedIndex < 0) {            return i;        }        if (i < selectedIndex) {            return i;        } else if (i >= selectedIndex) {            return childCount - 1 - i + selectedIndex;        } else {            return i;        }    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {                super.onSizeChanged(w, h, oldw, oldh);    }        @Override    protected boolean getChildStaticTransformation(View child, Transformation t) {        super.getChildStaticTransformation(child, t);        t.clear();        t.setTransformationType(Transformation.TYPE_MATRIX);                int index    = findViewIndex(child);        if(index != -1){            transformImageBitmap(child, t, index);        }        return true;    }        /**     *      *  找出子控件的索引     * @param child     * @return     */    private int findViewIndex(View child){                int index = (Integer) child.getTag();                return index;    }        /**     *       *  刷新所有的子控件，通过这个来触发 getChildStaticTransformation 的调用     *       */    private void invalidateVisibleChilds() {        for (int i = 0; i < getChildCount(); i++) {            getChildAt(i).invalidate();                    }            }    /**     *      * @param child     * @param t     * @param index     */    private void transformImageBitmap(View child, Transformation t, int index) {        mCamera.save();        final Matrix imageMatrix     = t.getMatrix();        final int imageHeight         = child.getHeight();        final int imageWidth         = child.getWidth();        int        width            = getPageMargin() + imageWidth;                if(index == mScrollPosition){ // 当前项从最大变化到最小 z轴变化范围 mMaxZoom *（1 -- 0）                        float dz        = mMaxZoom * ( 1- mScrollOffset * 1f / width);            int alpha        = (int) (mMaxAlpha * mScrollOffset * 1f / width);            mCamera.translate(0, 0, dz);            if(child instanceof NearImageView){                ((NearImageView)child).setShadeAlpha(alpha);            }                    }else if(index == mScrollPosition + 1){ // 当前项的后一项从最小变化到最大 ，z轴变化范围 mMaxZoom * (0 -- 1)                        float dz         =  mMaxZoom * mScrollOffset * 1f / width;                        int alpha        = (int) (mMaxAlpha * ( 1- mScrollOffset * 1f / width ));            mCamera.translate(0, 0, dz);                        if(child instanceof NearImageView){                ((NearImageView)child).setShadeAlpha(alpha);            }                    }else { // 当前项的后2项或者前N项大小不发生变化，z轴不变                                    mCamera.translate(0, 0, 0);                        if(child instanceof NearImageView){                ((NearImageView)child).setShadeAlpha(mMaxAlpha);            }        }        mCamera.getMatrix(imageMatrix);                imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));                imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));        mCamera.restore();    }        @Override    public void setOnPageChangeListener(OnPageChangeListener listener) {        mScrollListener = listener;    };                /**     * @author lipeilong     *     */    private class MyOnPageChangeListener implements OnPageChangeListener {                @Override        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {            if (mScrollListener != null) {                mScrollListener.onPageScrolled(position, positionOffset, positionOffsetPixels);            }                        mScrollPosition = position;            mScrollOffset    = positionOffsetPixels;                        // 刷新子控件            if(System.currentTimeMillis() % 2 == 0){                                invalidateVisibleChilds();                        }        }                @Override        public void onPageSelected(int position) {            mCurPosition    = position;            if (mScrollListener != null) {                mScrollListener.onPageSelected(position);            }        }                @Override        public void onPageScrollStateChanged(final int state) {                        if (mScrollListener != null) {                mScrollListener.onPageScrollStateChanged(state);            }                    }    }            @Override    public boolean onTouchEvent(MotionEvent ev) {        //         final float MAX_DISTANCE    = 50;                switch(ev.getAction()){                case MotionEvent.ACTION_DOWN:            mDownX    = ev.getRawX();            mDownY    = ev.getRawY();            mClick    = true;                        break;        case MotionEvent.ACTION_UP:            if(mClick && Math.abs(ev.getRawX()- mDownX) < MAX_DISTANCE && Math.abs(ev.getRawY() - mDownY) < MAX_DISTANCE){                // 点击事件                performMyClick(ev);                            }            break;        case MotionEvent.ACTION_MOVE:            if(Math.abs(ev.getRawX()- mDownX) > MAX_DISTANCE || Math.abs(ev.getRawY() - mDownY) > MAX_DISTANCE){                mClick = false;            }            break;        }                    return super.onTouchEvent(ev);    }        private void performMyClick(MotionEvent ev){                int index    = getCurrentItem();        if(isAtLeft(ev)){            setCurrentItem(index - 1);        }else if(isAtRight(ev)){            setCurrentItem(index + 1);        }    }            private boolean isAtLeft(MotionEvent ev){        int margin    = DipPixelUtil.dip2px(getContext(), 56);        int left    = getLeft() - margin;        int right    = getRight() + margin;        int top        = getTop();        int bottom    = getBottom();                // 必须使用全局坐标，同时要减去title和通知栏高度        int x        = (int) ev.getRawX();        int y        = (int) ev.getRawY() - DipPixelUtil.dip2px(getContext(), 96);        if(y > top && y < bottom){                        if(x < left){                return true;            }        }                return false;    }        private boolean isAtRight(MotionEvent ev){        int margin    = DipPixelUtil.dip2px(getContext(), 56);        int left    = getLeft() - margin;        int right    = getRight() + margin;        int top        = getTop();        int bottom    = getBottom();                int x        = (int) ev.getRawX();        int y        = (int) ev.getRawY() - DipPixelUtil.dip2px(getContext(), 96);        if(y > top && y < bottom){                        if(x > right){                return true;            }        }                return false;    }        public class FixedSpeedScroller extends Scroller {          private int mDuration = 300;                public FixedSpeedScroller(Context context) {              super(context);          }                public FixedSpeedScroller(Context context, android.view.animation.Interpolator interpolator) {              super(context, interpolator);          }                public FixedSpeedScroller(Context context, android.view.animation.Interpolator interpolator, boolean flywheel) {              super(context, interpolator, flywheel);          }                      @Override          public void startScroll(int startX, int startY, int dx, int dy, int duration) {              super.startScroll(startX, startY, dx, dy, mDuration);          }                @Override          public void startScroll(int startX, int startY, int dx, int dy) {              super.startScroll(startX, startY, dx, dy, mDuration);          }      }}

注意：1、设置父控件、子控件的clipChildren=false 2、滑动的时候刷新子控件