千变万化的ViewPager切换动画（1）--仅支持3.0以上版本的官方方法

（1）创建一个项目Viewpager_anim 添加图片资源guide_image1.png、guide_image2.png、guide_image3.png

编写activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <!-- ctrl+shitf+t 可以找到viewpager的包名 -->    <android.support.v4.view.ViewPager        android:id="@+id/id_viewpager"        android:layout_width="fill_parent"        android:layout_height="fill_parent" >    </android.support.v4.view.ViewPager></RelativeLayout>

编写MainActivity.java

package com.lc.viewpager_anim;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.app.Activity;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.view.View;import android.view.ViewGroup;import android.view.Window;import android.widget.ImageView;import android.widget.ImageView.ScaleType;public class MainActivity extends Activity {private ViewPager mViewPager;private int[] mImgIds = new int[] { R.drawable.guide_image1,R.drawable.guide_image2, R.drawable.guide_image3 };private List<ImageView> mImages = new ArrayList<ImageView>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);mViewPager = (ViewPager) findViewById(R.id.id_viewpager);/* * 为viewpager添加动画效果 */// 1.第一种动画效果// mViewPager.setPageTransformer(true, new DepthPageTransformer());// 2.第二种动画效果// mViewPager.setPageTransformer(true, new ZoomOutPageTransformer());// 3.第三种动画效果：旋转的动画效果mViewPager.setPageTransformer(true, new RotateDownPageTransformer());// 添加适配器mViewPager.setAdapter(new PagerAdapter() {/** * 初始化代码 */@Overridepublic Object instantiateItem(ViewGroup container, int position) {ImageView imageView = new ImageView(MainActivity.this);imageView.setImageResource(mImgIds[position]);imageView.setScaleType(ScaleType.CENTER_CROP);// 设置图片的形状防止变形container.addView(imageView);mImages.add(imageView);return imageView;}@Overridepublic void destroyItem(ViewGroup container, int position,Object object) {container.removeView(mImages.get(position));}@Overridepublic boolean isViewFromObject(View view, Object object) {return view == object;}@Overridepublic int getCount() {return mImgIds.length;}});}}

ZoomOutPageTransformer.java和DepthPageTransformer是android自己提供的两个动画，是在sdk--doc目录下的/sdk/docs/training/animation/screen-slide.html找到的，

ZoomOutPageTransformer.java（从文档中粘贴过来的时候可能有一些错误，只需要修改一下即可）

package com.lc.viewpager_anim;import android.annotation.SuppressLint;import android.support.v4.view.ViewPager;import android.view.View;public class ZoomOutPageTransformer implements ViewPager.PageTransformer {private static float MIN_SCALE = 0.85f;private static float MIN_ALPHA = 0.5f;@SuppressLint("NewApi")public void transformPage(View view, float position) {int pageWidth = view.getWidth();int pageHeight = view.getHeight();if (position < -1) { // [-Infinity,-1)// This page is way off-screen to the left.view.setAlpha(0);} else if (position <= 1) { // [-1,1]// Modify the default slide transition to shrink the page as wellfloat 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);}}}

DepthPageTransformer

package com.lc.viewpager_anim;import android.annotation.SuppressLint;import android.support.v4.view.ViewPager;import android.view.View;/* * 这里的动画效果只有在3.0以上有效果 */public class DepthPageTransformer implements ViewPager.PageTransformer {private static float MIN_SCALE = 0.75f;@SuppressLint("NewApi")public void transformPage(View view, float position) {int pageWidth = view.getWidth();if (position < -1) { // [-Infinity,-1)// This page is way off-screen to the left.view.setAlpha(0);} else if (position <= 0) { // [-1,0]// Use the default slide transition when moving to the left pageview.setAlpha(1);view.setTranslationX(0);view.setScaleX(1);view.setScaleY(1);} else if (position <= 1) { // (0,1]// Fade the page out.view.setAlpha(1 - position);// Counteract the default slide transitionview.setTranslationX(pageWidth * -position);// Scale the page down (between MIN_SCALE and 1)float scaleFactor = MIN_SCALE + (1 - MIN_SCALE)* (1 - Math.abs(position));view.setScaleX(scaleFactor);view.setScaleY(scaleFactor);} else { // (1,+Infinity]// This page is way off-screen to the right.view.setAlpha(0);}}}

RotateDownPageTransformer.java

package com.lc.viewpager_anim;import android.annotation.SuppressLint;import android.support.v4.view.ViewPager;import android.view.View;/* * 设置一个左右旋转的动画效果 *  */public class RotateDownPageTransformer implements ViewPager.PageTransformer {private static float MAX_ROTATE = 20f;// 设置动画旋转的角度private float mRot;// A页角度变化0·20；B页角度变化20·0@SuppressLint("NewApi")public void transformPage(View view, float position) {int pageWidth = view.getWidth();if (position < -1) { // [-Infinity,-1) 当前View不可见的时候view.setRotation(0); // 不让他旋转} else if (position <= 0) { // [-1,0] A页mRot = position * MAX_ROTATE; // 0`20view.setPivotX(pageWidth / 2); // 宽度view.setPivotY(view.getMeasuredHeight());// 高度view.setRotation(mRot);} else if (position <= 1) { // (0,1] B页mRot = position * MAX_ROTATE; // 20`2view.setPivotX(pageWidth / 2); // 宽度view.setPivotY(view.getMeasuredHeight());// 高度view.setRotation(mRot);} else { // (1,+Infinity]view.setRotation(0); // 不让他旋转}}}

完整项目下载地址：http://download.csdn.net/detail/u010870518/8468619