android 使用ViewPager开启应用时左右划动的界面

<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"
    tools:context=".MainActivity" >
　　添加Viewpager布局
    <android.support.v4.view.ViewPager
        android:id="@+id/vpager"
        android:background="@drawable/guide_1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </android.support.v4.view.ViewPager>

    <Button
        android:id="@+id/enter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="20dp"
        android:onClick="onEnter"
        android:visibility="gone"
        android:text="enter" />

</RelativeLayout>

public class MyPagerAdapter extends PagerAdapter {
    private List<View> list;
     
    public MyPagerAdapter(List<View> list) {
        this.list = list;
    }
    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        return arg0 == arg1;
    }
    /**
     * 添加视图
     */
    public Object instantiateItem(ViewGroup container, int position) {
        View v = list.get(position);
        //将View对象添加到ViewGroup中
        container.addView(v);
        return v;
    }
    /**
     * 移除视图
     */
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView(list.get(position));
    }
    
    
}

public class MainActivity extends Activity implements OnPageChangeListener {
    private ViewPager viewPager;
    //数据源
    private List<View>  list;
    //适配器
    private MyPagerAdapter adapter;
    
    Button btn3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn3 = (Button) findViewById(R.id.enter);
        viewPager = (ViewPager) findViewById(R.id.vpager);
        list = new ArrayList<View>();
        ininData();
        adapter = new MyPagerAdapter(list);
        //绑定适配器
        viewPager.setAdapter(adapter);
        //设置监听
        viewPager.setOnPageChangeListener(this);

        /*new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                 Intent intent = new Intent(MainActivity.this, One.class);
                 startActivity(intent);
                 finish();
            }
        }, 3000);*/


    }
    public void ininData(){
        ImageView iv1 = new ImageView(this);
        iv1.setBackgroundResource(R.drawable.guide_1);
        list.add(iv1);
        ImageView iv2 = new ImageView(this);
        iv2.setBackgroundResource(R.drawable.guide_2);
        list.add(iv2);
        ImageView iv3 = new ImageView(this);
        iv3.setBackgroundResource(R.drawable.guide_3);
        list.add(iv3);
        ImageView iv4 = new ImageView(this);
        iv4.setBackgroundResource(R.drawable.guide_4);
        list.add(iv4);
    }

    public void onEnter(View v){
        new Handler().post(new Runnable() {
            @Override
            public void run() {
                 Intent intent = new Intent(MainActivity.this, One.class);
                 startActivity(intent);
                 finish();
            }
        });
    }

    /**
     * 有三种状态（0，1，2）。
     * arg0 ==1的时辰默示正在滑动，
     * arg0==2的时辰默示滑动完毕了，
     * arg0==0的时辰默示什么都没做。
     */
    public void onPageScrollStateChanged(int arg0) {
        Log.i("tag", "onPageScrollStateChanged"+arg0);
    }

    /**
     * arg0 :当前页面，及你点击滑动的页面
       arg1:当前页面偏移的百分比
       arg2:当前页面偏移的像素位置   
     */
    public void onPageScrolled(int arg0, float arg1, int arg2) {
        Log.i("tag", "onPageScrolled"+arg0+"-->"+arg1+"--->"+arg2);
    }

    /**
     *   此方法是页面跳转完后得到调用，
     *   arg0是你当前选中的页面的Position（位置编号）。
     */
    public void onPageSelected(int arg0) {
        Log.i("tag", "onPageSelected"+arg0);
        if(arg0 == 3){
            btn3.setVisibility(View.VISIBLE);
        }
    }


}

class MyAsyncTask extends AsyncTask<Void, Void, Void>{

        protected Void doInBackground(Void... params) {
            while(true){
                //判断当前的异步任务是否取消
                if(isCancelled()){
                    break;
                }
                try {
                    Thread.sleep(2000);
                    //publishProgress();
                    
                } catch (Exception e) {
                    e.printStackTrace();
                }
                
                
            }
            return null;
        }
        protected void onProgressUpdate(Void... values) {
            super.onProgressUpdate(values);
            viewPager.setCurrentItem(++index%4);
                if(index==4){
                    Intent intent = new Intent(MainActivity.this, One.class);
                    startActivity(intent);
                    finish();
                    index=0;
                    //viewPager.removeAllViews();
                    
                    //viewPager.setCurrentItem(0);
                    //add();
                    
            }
        }
    }