ViewPager实现简单的界面滑动

1.activity_main.xml（主界面布局）

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

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

2.activity_one.xml(activity_two.xml、activity_three.xml与其类似，主要用于显示滑动界面的内容)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ff0000"
android:orientation="vertical">
</LinearLayout>

3.MainActivity.java

package com.lt.cn.viewpager1;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

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

public class MainActivity extends Activity {

private View viewOne, viewTwo, viewThree; //三个页面
private ViewPager viewPager;
private List<View> viewList;  //页面数组

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();  //初始化控件及页面

//适配器，类似ListView中的
//注意要写PagerAdapter,必须重写其中的四个函数，如下。
PagerAdapter pagerAdapter = new PagerAdapter() {
@Override
//返回显示页面的个数
public int getCount() {
return viewList.size();
}

@Override
//不是很懂
public boolean isViewFromObject(View view, Object object) {
return view == object;
}

@Override
//删除指定位置的页面
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(viewList.get(position));
}

@Override
//添加一个页面并返回该页面
public Object instantiateItem(ViewGroup container, int position) {
container.addView(viewList.get(position));
return viewList.get(position);
}
};

viewPager.setAdapter(pagerAdapter);
}

public void init() {
viewPager = (ViewPager) findViewById(R.id.viewpager_test);
LayoutInflater inflater = getLayoutInflater();
viewOne = inflater.inflate(R.layout.activity_one, null);
viewTwo = inflater.inflate(R.layout.activity_two, null);
viewThree = inflater.inflate(R.layout.activity_three, null);

viewList = new ArrayList<View>();
viewList.add(viewOne);
viewList.add(viewTwo);
viewList.add(viewThree);

}
}