Android ViewPager实现左右滑动翻页

package com.example.demo;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
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.TextView;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

ViewPager mViewPager=(ViewPager) findViewById(R.id.viewPager);

PagerAdapter mPagerAdapter=new MyPagerAdapter(this);

mViewPager.setAdapter(mPagerAdapter);
}

private	class	MyPagerAdapter	extends	PagerAdapter{

private	Context context;

private	ArrayList<TextView> views;

public	MyPagerAdapter(Context context){
this.context=context;
views=new ArrayList<TextView>();
for(int i=0;i<30;i++){
TextView tv=new TextView(context);
tv.setText(""+i);
views.add(tv);
}
}

@Override
public int getCount() {
return views.size();
}

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

@Override
public	View	instantiateItem(ViewGroup container, int position){
((ViewGroup) container).addView(views.get(position));

return	views.get(position);
}

@Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0==arg1;
}
}
}

<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="com.example.demo.MainActivity" >

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