实例讲解Android中ViewPager组件的一些进阶使用技巧

4.运行实例：

这种方法不会销毁不在当前页面的页面，不能实现页卡的创建和销毁。

四 实现ViewPager(数据源为List<Fragment>实现FargmentStatePagerAdapter)常用
改变Adapter:

package com.yayun.viewpagerdemo; 
 
import java.util.List; 
 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 
import android.support.v4.app.FragmentStatePagerAdapter; 
import android.view.View; 
 
public class MyFragmentPagerAdapter2 extends FragmentStatePagerAdapter { 
  List<Fragment> fragmentsList; 
  List<String> titleList; 
 
  public MyFragmentPagerAdapter2(FragmentManager fm,List<Fragment> fragmentsList,List<String> titleList) { 
    super(fm); 
    this.fragmentsList=fragmentsList; 
    this.titleList=titleList; 
  } 
 
  @Override 
  public Fragment getItem(int arg0) { 
    // TODO Auto-generated method stub 
    return fragmentsList.get(arg0); 
  } 
 
  @Override 
  public int getCount() { 
    // TODO Auto-generated method stub 
    return fragmentsList.size(); 
  } 
@Override 
/** 
 * 添加标题 
 */ 
public CharSequence getPageTitle(int position) { 
  // TODO Auto-generated method stub 
  return titleList.get(position); 
} 
@Override 
public Object instantiateItem(View container, int position) { 
  // TODO Auto-generated method stub 
  return super.instantiateItem(container, position); 
} 
@Override 
public void destroyItem(View container, int position, Object object) { 
  // TODO Auto-generated method stub 
  super.destroyItem(container, position, object); 
} 
 
} 

将MainActivity.java中的Adapter换一下即可，它可以实现页卡的创建和销毁。

五  onPagerChangeListener 监听使用
只需要修改MainActivity.java:

package com.yayun.viewpagerdemo; 
 
import java.util.ArrayList; 
import java.util.List; 
 
import android.graphics.Color; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.v4.view.PagerTabStrip; 
import android.support.v4.view.ViewPager; 
import android.support.v4.view.ViewPager.OnPageChangeListener; 
import android.support.v4.view.ViewPager.PageTransformer; 
import android.support.v7.app.ActionBarActivity; 
import android.view.View; 
import android.view.Window; 
import android.widget.Toast; 
 
public class MainActivity extends ActionBarActivity implements OnPageChangeListener { 
  private ViewPager viewPager; 
  private List<View> listViews=null; 
  ViewPagerAdapter pagerAdapter; 
  PagerTabStrip pagerTabStrip; 
  private List<String> titleList; 
  private List<Fragment> fragmentsList; 
  MyFragmentPagerAdapter myFragmentPagerAdapter; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    setContentView(R.layout.activity_main); 
     
    viewPager=(ViewPager) findViewById(R.id.pager); 
    pagerTabStrip=(PagerTabStrip) findViewById(R.id.strip); 
     
    /** 
     * 设置PagerTabStrip属性 
     */ 
    pagerTabStrip.setBackgroundColor(Color.GREEN); 
    pagerTabStrip.setDrawFullUnderline(false); 
    pagerTabStrip.setTextColor(Color.WHITE); 
    listViews=new ArrayList<View>(); 
    titleList=new ArrayList<String>(); 
    fragmentsList=new ArrayList<Fragment>(); 
    fragmentsList.add(new Fragment1()); 
    fragmentsList.add(new Fragment2()); 
    fragmentsList.add(new Fragment3()); 
    titleList.add("第一页"); 
    titleList.add("第二页"); 
    titleList.add("第三页"); 
    /** 
     * 为Adapter创建数据源 
     */ 
    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); 
    listViews.add(view1); 
    listViews.add(view2); 
    listViews.add(view3); 
    pagerAdapter=new ViewPagerAdapter(listViews,titleList) ; 
    myFragmentPagerAdapter=new MyFragmentPagerAdapter(getSupportFragmentManager(), fragmentsList, titleList); 
    //viewPager.setAdapter(pagerAdapter); 
    viewPager.setAdapter(myFragmentPagerAdapter); 
    viewPager.setOnPageChangeListener(this);//加载监听器 
 
  } 
 
  @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) { 
    Toast.makeText(this, "当前页面为"+(arg0+1), Toast.LENGTH_SHORT).show(); 
     
  } 
 
} 

								 
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