Android_ViewPager

<?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:orientation="vertical" >
    <TextView 
        android:id="@+id/view01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第一个界面"/>

</LinearLayout>

package com.example.viewpager;

import android.os.Bundle;
import android.support.v4.app.Fragment;//兼容3.0以下的版本
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment1 extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        return inflater.inflate(R.layout.view1, null);
    }
}

package com.example.viewpager;

import java.util.List;

import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;

public class MyPagerAdapter extends PagerAdapter{
    private List<View>viewList;
    private List<String>titleList;
    
    public MyPagerAdapter(List<View> viewList,List<String>titleList) {
        super();
        this.viewList = viewList;
        this.titleList = titleList;
    }
    /**
     *  返回也可的数量
     */
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return viewList.size();
    }
    /**
     * View是否来自于对象
     */
    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        // TODO Auto-generated method stub
        return arg0==arg1;
    }
    /**
     * 自动实例化和销毁页卡
     * 当前显示第2个界面，滑到第3个界面，就会自动实例化第四界面，销毁第一个界面
     * 实例化一个页卡
     */
    @Override
        public Object instantiateItem(ViewGroup container, int position) {
            // TODO Auto-generated method stub
        container.addView(viewList.get(position));    
        return viewList.get(position);
        }
    /**
     * 销毁一个页卡
     */
    @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            // TODO Auto-generated method stub
        container.removeView(viewList.get(position));
    }
    /**
     * 设置viewPager页卡标题
     * 
     */
    @Override
    public CharSequence getPageTitle(int position) {
        // TODO Auto-generated method stub
        return titleList.get(position);
    }
}

package com.example.viewpager;

import java.util.List;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
/**
 * FragmentPagerAdapter
 * 该类没有自动创建和自动销毁的功能
 * 
 * FragmentStatePagerAdapter
 * 有自动创建和销毁页卡的功能
 * 需重写instantiateItem（）；destroyItem（）；
 * 
 *
 */
public class MyFragmentPagerAdapter extends FragmentPagerAdapter{
    private List<Fragment> fragmentList;
    private List<String> titleList;
    
    public MyFragmentPagerAdapter(FragmentManager fm,
            List<Fragment> fragmentList, List<String> titleList) {
        super(fm);
        this.fragmentList = fragmentList;
        this.titleList = titleList;
    }
    @Override
    public CharSequence getPageTitle(int position) {
        // TODO Auto-generated method stub
        return titleList.get(position);
    }
    @Override
    public Fragment getItem(int arg0) {
        // TODO Auto-generated method stub
        return fragmentList.get(arg0);
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return fragmentList.size();
    }

}

<LinearLayout 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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.viewpager.MainActivity" >

   <android.support.v4.view.ViewPager
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_gravity="center"
       android:id="@+id/pager"
       >
        <android.support.v4.view.PagerTabStrip
            android:id="@+id/strip"
             android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:layout_gravity="top"
            >
            <!-- 子标签 ,显示标题
            android.support.v4.view.PagerTabStrip
            android.support.v4.view.PagerTitleStrip
            -->
        </android.support.v4.view.PagerTabStrip>
   </android.support.v4.view.ViewPager>
</LinearLayout>

package com.example.viewpager;
/*    ViewPager可以使视图滑动
 *     ViewPager可以看做一个装载view对象或fragment的一个集合
 * 加载显示的页卡
     *     将layout布局转化为view对象和
     *     （1）LayoutInflater if = getLayoutInflater().from(this);
     *         if.inflate(resouce,root);
     *     (2)View.inflate(context,resouce,root);
     * 
     * 配置适配器：
     * (1)PagerAdapter 数据源：List<View>
     * (2)FragmentPagerAdapter 数据源：List<Fragment>
     * (3)FragmentStatePagerAdapter 数据源：List<Fragment>
     监听器的使用
         OnPageChangeListener()
         --用来监控ViewPager滑动到第几页
 *
 */
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.PagerTabStrip;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends FragmentActivity implements OnPageChangeListener{

    private List<View> viewList;
    private ViewPager pager;
    private PagerTabStrip strip;
    private List<String> titleList;
    private PagerTabStrip tab;
    private List<Fragment> fragmentList;

    @SuppressWarnings("deprecation")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        viewList = new ArrayList<View>();
        titleList = new ArrayList<String>();
        
        /**
         * 通过View对象作为ViewPager的数据源
         */
        View view1 = View.inflate(this, R.layout.view1, null);
        View view2 = View.inflate(this, R.layout.view2, null);
        View view3 = View.inflate(this, R.layout.view3, null);
        View view4 = View.inflate(this, R.layout.view4, null);
        
        viewList.add(view1);
        viewList.add(view2);
        viewList.add(view3);
        viewList.add(view4);
        
        //为ViewPager设置标题
        titleList.add("第一页");
        titleList.add("第二页");
        titleList.add("第三页");
        titleList.add("第四页");
        
        //为PagerTabStrip设置属性
        tab = (PagerTabStrip) findViewById(R.id.strip);
        tab.setBackgroundColor(Color.BLACK);
        tab.setTextColor(Color.YELLOW);
        tab.setDrawFullUnderline(false);
        
        //创建PagerAdapter的适配器
        MyPagerAdapter adapter = new MyPagerAdapter(viewList,titleList);
        //加载适配器
        pager = (ViewPager) findViewById(R.id.pager);
    //    pager.setAdapter(adapter);
        
        //通过Fragment对象最为ViewPager的数据源
        fragmentList = new ArrayList<Fragment>();
        fragmentList.add(new Fragment1());
        fragmentList.add(new Fragment2());
        fragmentList.add(new Fragment3());
        fragmentList.add(new Fragment4());
        //创建FragmentPagerAdapter的适配器
        MyFragmentPagerAdapter fragmentAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager(), fragmentList, titleList);
        pager.setAdapter(fragmentAdapter);
        
        //设置监听器
        pager.setOnPageChangeListener(this);;
        
        
    }

    @Override
    public void onPageScrollStateChanged(int arg0) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void onPageSelected(int arg0) {
        // TODO Auto-generated method stub
        Toast.makeText(this, "当前是第"+(arg0+1)+"个界面", Toast.LENGTH_SHORT).show();
    }

    
}