A sliding introduce panel

import java.util.ArrayList;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.support.v4.view.PagerAdapter;import android.support.v4.view.PagerTitleStrip;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.view.LayoutInflater;import android.view.View;import android.view.animation.Animation;import android.view.animation.TranslateAnimation;import android.widget.ImageView;public class Viewpager extends Activity {    	private ViewPager mViewPager;	private PagerTitleStrip mPagerTitleStrip;	private ImageView mPageImg;	private int currIndex = 0;	private ImageView mPage0,mPage1,mPage2,mPage3,mPage4,mPage5,mPage6,mPage7,mPage8;	    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.viewpager);        mViewPager = (ViewPager)findViewById(R.id.viewpager);                mViewPager.setOnPageChangeListener(new MyOnPageChangeListener());        mPagerTitleStrip = (PagerTitleStrip)findViewById(R.id.pagertitle);                 mPage0 = (ImageView)findViewById(R.id.page0);        mPage1 = (ImageView)findViewById(R.id.page1);        mPage2 = (ImageView)findViewById(R.id.page2);        mPage3 = (ImageView)findViewById(R.id.page3);        mPage4 = (ImageView)findViewById(R.id.page4);        mPage5 = (ImageView)findViewById(R.id.page5);        mPage6 = (ImageView)findViewById(R.id.page6);        mPage7 = (ImageView)findViewById(R.id.page7);        mPage8 = (ImageView)findViewById(R.id.page8);                               LayoutInflater mLi = LayoutInflater.from(this);        View view1 = mLi.inflate(R.layout.view1, null);        View view2 = mLi.inflate(R.layout.view2, null);        View view3 = mLi.inflate(R.layout.view3, null);        View view4 = mLi.inflate(R.layout.view4, null);        View view5 = mLi.inflate(R.layout.view5, null);        View view6 = mLi.inflate(R.layout.view6, null);        View view7 = mLi.inflate(R.layout.view7, null);        View view8 = mLi.inflate(R.layout.view8, null);        View view9 = mLi.inflate(R.layout.view9, null);        	            //page's data        final ArrayList<View> views = new ArrayList<View>();        views.add(view1);        views.add(view2);        views.add(view3);        views.add(view4);        views.add(view5);        views.add(view6);        views.add(view7);        views.add(view8);        views.add(view9);        //set title        final ArrayList<String> titles = new ArrayList<String>();        titles.add("①");        titles.add("②");        titles.add("③");        titles.add("④");        titles.add("⑤");        titles.add("⑥");        titles.add("⑦");        titles.add("⑧");        titles.add("⑨");                              PagerAdapter mPagerAdapter = new PagerAdapter() {						@Override			public boolean isViewFromObject(View arg0, Object arg1) {				return arg0 == arg1;			}						@Override			public int getCount() {				return views.size();			}			@Override			public void destroyItem(View container, int position, Object object) {				((ViewPager)container).removeView(views.get(position));			}						@Override			public CharSequence getPageTitle(int position) {				return titles.get(position);			}						@Override			public Object instantiateItem(View container, int position) {				((ViewPager)container).addView(views.get(position));				return views.get(position);			}		};				mViewPager.setAdapter(mPagerAdapter);    }        public class MyOnPageChangeListener implements OnPageChangeListener {		public void onPageSelected(int arg0) {//参数arg0为选中的View			Animation animation = null;//声明动画对象			switch (arg0) {			case 0:	//页面一							mPage0.setImageDrawable(getResources().getDrawable(R.drawable.page_now));				mPage1.setImageDrawable(getResources().getDrawable(R.drawable.page));				if (currIndex == arg0+1) {					animation = new TranslateAnimation(arg0+1, arg0, 0, 0);//point from arg0+1 to arg0				} 				break;			case 1: //页面二				mPage1.setImageDrawable(getResources().getDrawable(R.drawable.page_now));//current View				mPage0.setImageDrawable(getResources().getDrawable(R.drawable.page));//pre View				mPage2.setImageDrawable(getResources().getDrawable(R.drawable.page));//next View				if (currIndex == arg0-1) {					animation = new TranslateAnimation(arg0-1, arg0, 0, 0);									} else if (currIndex == arg0+1) {					animation = new TranslateAnimation(arg0+1, arg0, 0, 0);				}				break;			case 2: 				mPage2.setImageDrawable(getResources().getDrawable(R.drawable.page_now));				mPage1.setImageDrawable(getResources().getDrawable(R.drawable.page));				mPage3.setImageDrawable(getResources().getDrawable(R.drawable.page));				if (currIndex == arg0-1) {					animation = new TranslateAnimation(arg0-1, arg0, 0, 0);				} else if (currIndex == arg0+1) {					animation = new TranslateAnimation(arg0+1, arg0, 0, 0);				}				break;			case 3:				mPage3.setImageDrawable(getResources().getDrawable(R.drawable.page_now));				mPage4.setImageDrawable(getResources().getDrawable(R.drawable.page));				mPage2.setImageDrawable(getResources().getDrawable(R.drawable.page));				if (currIndex == arg0-1) {					animation = new TranslateAnimation(arg0-1, arg0, 0, 0);									} else if (currIndex == arg0+1) {					animation = new TranslateAnimation(arg0+1, arg0, 0, 0);				}				break;			case 4:				mPage4.setImageDrawable(getResources().getDrawable(R.drawable.page_now));				mPage3.setImageDrawable(getResources().getDrawable(R.drawable.page));				mPage5.setImageDrawable(getResources().getDrawable(R.drawable.page));				if (currIndex == arg0-1) {					animation = new TranslateAnimation(arg0-1, arg0, 0, 0);				} else if (currIndex == arg0+1) {					animation = new TranslateAnimation(arg0+1, arg0, 0, 0);				}				break;			case 5:				mPage5.setImageDrawable(getResources().getDrawable(R.drawable.page_now));				mPage4.setImageDrawable(getResources().getDrawable(R.drawable.page));				mPage6.setImageDrawable(getResources().getDrawable(R.drawable.page));				if (currIndex == arg0-1) {					animation = new TranslateAnimation(arg0-1, arg0, 0, 0);				} else if (currIndex == arg0+1) {					animation = new TranslateAnimation(arg0+1, arg0, 0, 0);				}				break;			case 6:				mPage6.setImageDrawable(getResources().getDrawable(R.drawable.page_now));				mPage5.setImageDrawable(getResources().getDrawable(R.drawable.page));				mPage7.setImageDrawable(getResources().getDrawable(R.drawable.page));				if (currIndex == arg0-1) {					animation = new TranslateAnimation(arg0-1, arg0, 0, 0);				} else if (currIndex == arg0+1) {					animation = new TranslateAnimation(arg0+1, arg0, 0, 0);				}				break;			case 7:				mPage7.setImageDrawable(getResources().getDrawable(R.drawable.page_now));				mPage8.setImageDrawable(getResources().getDrawable(R.drawable.page));				mPage6.setImageDrawable(getResources().getDrawable(R.drawable.page));				if (currIndex == arg0-1) {					animation = new TranslateAnimation(arg0-1, arg0, 0, 0);				} else if (currIndex == arg0+1) {					animation = new TranslateAnimation(arg0+1, arg0, 0, 0);				}				break;			case 8:				mPage8.setImageDrawable(getResources().getDrawable(R.drawable.page_now));				mPage7.setImageDrawable(getResources().getDrawable(R.drawable.page));				if (currIndex == arg0-1) {					animation = new TranslateAnimation(arg0-1, arg0, 0, 0);				} 				break;			}			currIndex = arg0;			animation.setFillAfter(true);			animation.setDuration(300);		}        public void startbutton(View v) {        	        Intent intent = new Intent();		intent.setClass(Viewpager.this,Viewdoor.class);		startActivity(intent);		this.finish();//finish Activity      }     }

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