Android的 ViewPager 学习笔记

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>

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);      }  }