Android:ViewPager04

　　目录结构层次：

注意点：

1.MyAdapter.java一定要 extends PagerAdapter

2.MyAdapter要覆写以下几个方法：

a.public int getCount(){}

b.public boolean isViewFromObject(View arg0, Object arg1){}

c.public Object instantiateItem(ViewGroup container, int position){}

d.public void destroyItem(ViewGroup container, int position, Object object) {}//destroyItem方法一定要注意，具体注意事项见下面的具体代码的注释。

e.public CharSequence getPageTitle(int position) {}  有title的时候才需要覆盖这个方法。

fragment_main.xml:

<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"
    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.wyl.view04.MainActivity$PlaceholderFragment" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

　　main.xml:

<?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" >
    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" >
        <android.support.v4.view.PagerTabStrip
            android:id="@+id/tab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >
        </android.support.v4.view.PagerTabStrip>

    </android.support.v4.view.ViewPager>

</LinearLayout>

　　view01.xml:

<?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/text01"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="易"
	    />
</LinearLayout>

　　view02.xml:

<?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/text01"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="华"
	    />
</LinearLayout>

　　view03.xml:

<?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/text01"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="kai"
	    />
</LinearLayout>

　　view04.xml:

<?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/text01"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="men"
	    />
</LinearLayout>

　　view05.xml:

<?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/text01"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:text="wu"
	    />
</LinearLayout>

　　MainActivity.java:

package com.wyl.view04;

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

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.view.PagerTabStrip;
import android.support.v4.view.ViewPager;
import android.view.View;

public class MainActivity extends Activity {
	List<View> listview;
	List<String> titlelist;
	ViewPager vp;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		System.out.println("================12342142=========");
		View v01 = View.inflate(this, R.layout.view01, null);
		View v02 = View.inflate(this, R.layout.view02, null);
		View v03 = View.inflate(this, R.layout.view03, null);
		View v04 = View.inflate(this, R.layout.view04, null);
		//实例化数据源
		listview = new ArrayList<View>();
		listview.add(v01);
		listview.add(v02);
		listview.add(v03);
		listview.add(v04);

		//实例化titlelist
		titlelist = new ArrayList<String>();
		titlelist.add("背景");
		titlelist.add("设置");
		titlelist.add("朋友");
		titlelist.add("动态");
		PagerTabStrip tab = (PagerTabStrip) findViewById(R.id.tab);
		tab.setBackgroundColor(Color.YELLOW);
		tab.setTabIndicatorColor(Color.GRAY);
		tab.setDrawFullUnderline(false);
		tab.setTextColor(Color.RED);
		vp = (ViewPager) findViewById(R.id.pager);
		MyAdapter adapter = new MyAdapter(listview,titlelist);
		vp.setAdapter(adapter);
		System.out.println("09fdjfod========");
	}

}

　　MyAdapter.java

package com.wyl.view04;

import java.util.List;

import org.w3c.dom.ls.LSInput;

import android.graphics.Shader.TileMode;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;

public class MyAdapter extends PagerAdapter{
	List<View> listview;
	List<String> titlelist;
	public MyAdapter(List<View> listview,List<String> titlelist){
		this.listview = listview;
		this.titlelist = titlelist;
	}
	@Override
	public int getCount() {
		// TODO Auto-generated method stub
		return listview.size();
	}

	@Override
	public boolean isViewFromObject(View arg0, Object arg1) {
		// TODO Auto-generated method stub
		return arg0==arg1;
	}

	@Override
	public Object instantiateItem(ViewGroup container, int position) {
		container.addView(listview.get(position));
		System.err.println("hahha.........");
//		if(position==4){
//		}
		return listview.get(position);
	}

	@Override
	public void destroyItem(ViewGroup container, int position, Object object) {
//		super.destroyItem(container, position, object);
		container.removeView(listview.get(position));//上面一行一定要注释掉，否则会报destroyItem方法没有被覆盖
	}

	@Override
	public CharSequence getPageTitle(int position) {
		// TODO Auto-generated method stub
		System.out.println("=====9999999999");
		return titlelist.get(position);
	}

}

　　效果图：