用ViewPager实现多页面的切换效果

说明：

ViewPager用于实现多页面的切换效果，该类存在于Google的兼容包里面，所以在引用时记得在BuilldPath中加入“android-support-v4.jar”

主布局文件

main.xml

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

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

<android.support.v4.view.PagerTitleStrip
android:id="@+id/pagertitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top" />
</android.support.v4.view.ViewPager>

</LinearLayout>

其中ViewPager为多页显示控件，PagerTitleStrip用于显示当前页面的标题

主窗口代码：

PagerTitleDemoActivity.java

package com.ns.pager;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.PagerTitleStrip;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;

public class PagerTitleDemoActivity extends Activity {
/** Called when the activity is first created. */
private ViewPager mViewPager;
private PagerTitleStrip mPagerTitleStrip;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mViewPager = (ViewPager)findViewById(R.id.viewpager);
mPagerTitleStrip = (PagerTitleStrip)findViewById(R.id.pagertitle);

//将要分页显示的View装入数组中
LayoutInflater mLi = LayoutInflater.from(this);
View view1 = mLi.inflate(R.layout.view1, null);
View view2 = mLi.inflate(R.layout.view2, null);
View view3 = mLi.inflate(R.layout.view3, null);

//每个页面的Title数据
final ArrayList<View> views = new ArrayList<View>();
views.add(view1);
views.add(view2);
views.add(view3);

final ArrayList<String> titles = new ArrayList<String>();
titles.add("tab1");
titles.add("tab2");
titles.add("tab3");

//填充ViewPager的数据适配器
PagerAdapter mPagerAdapter = new PagerAdapter() {

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

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

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

@Override
public CharSequence getPageTitle(int position) {
return titles.get(position);
}

@Override
public Object instantiateItem(View container, int position) {
((ViewPager)container).addView(views.get(position));
return views.get(position);
}
};

mViewPager.setAdapter(mPagerAdapter);
}
}