package com.k1.description;import java.util.HashMap;import java.util.Map;import android.os.Bundle;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.view.animation.AlphaAnimation;public class WelcomeActivity extends BaseActivity {    private static final int[] PAGERS = new int[] { R.layout.activity_welcome_pager1, R.layout.activity_welcome_pager4,            R.layout.activity_welcome_pager1, R.layout.activity_welcome_pager4, R.layout.activity_welcome_pager1 };    private ViewGroup mPoints;    private int mLast = 0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_welcome);        mPoints = (ViewGroup) findViewById(R.id.points);//滑动时移动的圆点        View view = mPoints.getChildAt(0);        view.setBackgroundResource(R.drawable.point_selected);        ViewPager vp = (ViewPager) findViewById(R.id.viewpager);        vp.setAdapter(new PagerAdapter() {            Map
     
       viewMap = new HashMap
      
       ();            @Override            public int getCount() {                return 5;            }            @Override            public void destroyItem(ViewGroup container, int position, Object object) {                ((ViewPager) container).removeView(viewMap.get(position));            }            @Override            public Object instantiateItem(ViewGroup container, int position) {                View view = viewMap.get(position);                if (view == null) {                    view = getLayoutInflater().inflate(PAGERS[position], null);                    AlphaAnimation a = new AlphaAnimation(0.5f, 1);                    a.setDuration(300);                    view.startAnimation(a);                    viewMap.put(Integer.valueOf(position), view);                }                ((ViewPager) container).addView(view);                return view;            }            @Override            public boolean isViewFromObject(View arg0, Object arg1) {                return arg0 == arg1;            }            @Override            public int getItemPosition(Object object) {                return super.getItemPosition(object);            }        });        vp.setOnPageChangeListener(new OnPageChangeListener() {            @Override            public void onPageSelected(int position) {                for (int i = 0; i < mPoints.getChildCount(); i++) {                    View view = mPoints.getChildAt(i);                    if (i == mLast) {                        view.setBackgroundResource(R.drawable.point_unselected);                    }                    if (i == position) {                        view.setBackgroundResource(R.drawable.point_selected);                    }                }                mLast = position;            }            @Override            public void onPageScrolled(int arg0, float arg1, int arg2) {            }            @Override            public void onPageScrollStateChanged(int arg0) {            }        });            }}