viewpager 3D旋转 几行代码轻松搞定

由于实现很简单 直接上代码和图。由于为了方便看效果写了自动轮播 可以去掉。为了自动轮播好看 又用反射修改了过渡时间 也可以去掉

所以核心代码就两句话
vp.setPageTransformer(true, new Switch3DPageTransformer());

transformPage(View view, float position)—–>view.setRotationY(position * 90);

其他都是为了效果看着舒服点

效果图

1. 自定义切换效果（另附送一效果）
   核心代码就这 view.setRotationY(position * 90);
   其他都是为了圆润点

package your package;import android.support.v4.view.ViewPager;import android.util.Log;import android.view.View;import com.nineoldandroids.view.ViewHelper;/** * Created by  Rex on 2016/9/28. * 给ViewPager加上3d旋转过度动画 */public class Switch3DPageTransformer implements ViewPager.PageTransformer {    private static final float MIN_SCALE = 0.75f;    @Override    public void transformPage(View view, float position) {        int pageWidth = view.getWidth();        Log.i("rex", "position" + position);//        setAnimation1 效果1//        3D 旋转 效果2        view.setRotationY(position * 90);        float scaleFactor = MIN_SCALE + (1 - MIN_SCALE) * (1 - position);        // view.setScaleX(scaleFactor);        ViewHelper.setScaleX(view, scaleFactor);        // view.setScaleY(1);        ViewHelper.setScaleY(view, scaleFactor);        ViewHelper.setAlpha(view, 1 - position);    }    private void setAnimation1(View view, int pageWidth, float position) {        if (position < -1) { // [-Infinity,-1)            // This page is way off-screen to the left.            // view.setAlpha(0);            ViewHelper.setAlpha(view, 0);        } else if (position <= 0)// a页滑动至b页 ； a页从 0.0 -1 ；b页从1 ~ 0.0        { // [-1,0]            // Use the default slide transition when moving to the left page            // view.setAlpha(1);            ViewHelper.setAlpha(view, 1);            // view.setTranslationX(0);            ViewHelper.setTranslationX(view, 0);            // view.setScaleX(1);            ViewHelper.setScaleX(view, 1);            // view.setScaleY(1);            ViewHelper.setScaleY(view, 1);        } else if (position <= 1) { // (0,1]            // Fade the page out.            // view.setAlpha(1 - position);            ViewHelper.setAlpha(view, 1 - position);            // Counteract the default slide transition            // view.setTranslationX(pageWidth * -position);            ViewHelper.setTranslationX(view, pageWidth * -position);            // Scale the page down (between MIN_SCALE and 1)            float scaleFactor = MIN_SCALE + (1 - MIN_SCALE) * (1 - position);            // view.setScaleX(scaleFactor);            ViewHelper.setScaleX(view, scaleFactor);            // view.setScaleY(1);            ViewHelper.setScaleY(view, scaleFactor);        } else { // (1,+Infinity]            // This page is way off-screen to the right.            // view.setAlpha(0);            ViewHelper.setAlpha(view, 1);        }    }}

2.反射延长过度时间

package package your package;import android.content.Context;import android.support.v4.view.ViewPager;import android.view.animation.Interpolator;import android.widget.Scroller;import java.lang.reflect.Field;/** * Created by Rex on 2015/9/25. * * 修改ViewPager切换的时长 */public class ViewPagerScroller extends Scroller {    private int mScrollDuration = 2000; // 滑动速度    /**     * 设置速度速度     *     * @param duration     */    public void setScrollDuration(int duration) {        this.mScrollDuration = duration;    }    public ViewPagerScroller(Context context) {        super(context);    }    public ViewPagerScroller(Context context, Interpolator interpolator) {        super(context, interpolator);    }    public ViewPagerScroller(Context context, 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, mScrollDuration);    }    @Override    public void startScroll(int startX, int startY, int dx, int dy) {        super.startScroll(startX, startY, dx, dy, mScrollDuration);    }    public void initViewPagerScroll(ViewPager viewPager) {        try {            Field mScroller = ViewPager.class.getDeclaredField("mScroller");            mScroller.setAccessible(true);            mScroller.set(viewPager, this);        } catch (Exception e) {            e.printStackTrace();        }    }}

1. 基础布局代码

package your package;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.view.View;import android.view.ViewGroup;import android.widget.ViewAnimator;public class MainActivity extends Activity {    private ViewPager vp;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        vp = (ViewPager) findViewById(R.id.vp);        vp.setPageTransformer(true, new Switch3DPageTransformer());        final int[] colors = new int[]{Color.CYAN, Color.GREEN, Color.YELLOW, Color.DKGRAY,};        vp.postDelayed(new Runnable() {            @Override            public void run() {                vp.setCurrentItem(vp.getCurrentItem() + 1);                vp.postDelayed(this, 2000);            }        }, 2000);        //设置切换时长        new ViewPagerScroller(vp.getContext()).initViewPagerScroll(vp);        vp.setAdapter(new PagerAdapter() {            @Override            public Object instantiateItem(ViewGroup container, int position) {                ViewAnimator view = new ViewAnimator(container.getContext());                view.setBackgroundColor(colors[position % 4]);                ;                container.addView(view);                return view;            }            @Override            public void destroyItem(ViewGroup container, int position,                                    Object object) {                container.removeView((View) object);            }            @Override            public boolean isViewFromObject(View view, Object object) {                return view == object;            }            @Override            public int getCount() {                return colors.length * 1000;            }        });    }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:fitsSystemWindows="true"    >    <android.support.v4.view.ViewPager        android:id="@+id/vp"        android:layout_width="match_parent"        android:layout_height="match_parent"        ></android.support.v4.view.ViewPager></RelativeLayout>