ViewPager动画切换

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:context=".MainActivity" >

    <android.support.v4.view.ViewPager
        android:id="@+id/id_viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </android.support.v4.view.ViewPager>

</RelativeLayout>

后台代码：

package org.dream.android_001;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
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.ImageView;
import android.widget.ImageView.ScaleType;

public class MainActivity extends Activity {
    private ViewPager viewPager;
    
    /**
     * 本地图片资源id
     * Assets与res的区别
     * 1、assets文件夹下文件不会被映射到R.java文件中,res文件夹下的文件会
     * 2、assets可以有子目录,res不可以
     */
    private int[] mImgIds = new int[] { R.drawable.guide_image1,
            R.drawable.guide_image2, R.drawable.guide_image3 };

    /**
     * 用于存储ImageView列表，并用于销毁等一系列操作
     */
    private List<ImageView> mImgs = new ArrayList<ImageView>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        viewPager = (ViewPager) findViewById(R.id.id_viewPager);
        viewPager.setAdapter(new PagerAdapter() {
            
            // 实例化Item
            @Override
            public Object instantiateItem(ViewGroup container, int position) {
                ImageView imageView = new ImageView(MainActivity.this);
                imageView.setImageResource(mImgIds[position]);
                imageView.setScaleType(ScaleType.CENTER_CROP);
                container.addView(imageView);
                mImgs.add(imageView);
                return imageView;
            };

            @Override
            public void destroyItem(ViewGroup container, int position,
                    Object object) {
                container.removeView(mImgs.get(position));
            };

            @Override
            public boolean isViewFromObject(View view, Object obj) {
                return view == obj;
            }

            @Override
            public int getCount() {
                return mImgIds.length;
            }
        });
    }
}

可用于welcome引导页面