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安卓应用中实现多页面滑动切换 Android应用中利用ViewPager实现多页面滑动切换效果示例

Trinea 人气:0
想了解Android应用中利用ViewPager实现多页面滑动切换效果示例的相关内容吗,Trinea在本文为您仔细讲解安卓应用中实现多页面滑动切换的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:ViewPager,滑动,页面切换,Android,安卓,下面大家一起来学习吧。

1、添加android support包
因为上面的几个类都是在android support包中才提供,我们先添加包。
在Eclipse->Window->Android SDK Manager,选择列表中Extras->Android Support Library进行安装。下载完后在android-sdk\extras\android\support目录下,这里我们选择v4版本,进入v4目录,拷贝其中的android-support-v4.jar文件到工程的libs目录(若没有新建)下即可,编译时ADT会自动将其导入项目中。

2、新建ViewPager的layout,内容如下

<?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/viewPager"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center" >
    <android.support.v4.view.PagerTabStrip  
      android:layout_width="wrap_content"  
      android:layout_height="wrap_content"  
      android:layout_gravity="top" />
  </android.support.v4.view.ViewPager>
</LinearLayout>

ViewPager用来管理layout并可以左右滑动显示各个页面数据,PagerTabStrip用来显示页面title,android:layout_gravity="top"表示title在顶部,可设置bottom等。

 

3、新建FragmentActivity页面
FragmentActivity页面含有ViewPager元素,可以用来显示Fragment,定义如下:

public class ViewPagerDemo extends FragmentActivity {

  /** 页面list **/
  List<Fragment> fragmentList = new ArrayList<Fragment>();
  /** 页面title list **/
  List<String>  titleList  = new ArrayList<String>();

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.view_pager_demo);

    ViewPager vp = (ViewPager)findViewById(R.id.viewPager);
    fragmentList.add(new ViewPagerFragment1("页面1"));
    fragmentList.add(new ViewPagerFragment1("页面2"));
    fragmentList.add(new ViewPagerFragment1("页面3"));
    titleList.add("title 1 ");
    titleList.add("title 2 ");
    titleList.add("title 3 ");
    vp.setAdapter(new myPagerAdapter(getSupportFragmentManager(), fragmentList, titleList));
  }

  /**
   * 定义适配器
   */
  class myPagerAdapter extends FragmentPagerAdapter {

    private List<Fragment> fragmentList;
    private List<String>  titleList;

    public myPagerAdapter(FragmentManager fm, List<Fragment> fragmentList, List<String> titleList){
      super(fm);
      this.fragmentList = fragmentList;
      this.titleList = titleList;
    }

    /**
     * 得到每个页面
     */
    @Override
    public Fragment getItem(int arg0) {
      return (fragmentList == null || fragmentList.size() == 0) ? null : fragmentList.get(arg0);
    }

    /**
     * 每个页面的title
     */
    @Override
    public CharSequence getPageTitle(int position) {
      return (titleList.size() > position) ? titleList.get(position) : "";
    }

    /**
     * 页面的总个数
     */
    @Override
    public int getCount() {
      return fragmentList == null ? 0 : fragmentList.size();
    }
  }
}

其中的myPagerAdapter集成自ragmentPagerAdapter,为ViewPager提供数据源。

onCreate函数得到ViewPager实例并设置数据源,getSupportFragmentManager表示得到Fragment管理器。ViewPagerFragment1表示具体的页面,见下面介绍。

4、新建Fragment页面
Fragment页面即为左右滑动需要显示的页面,新建类集成Fragment,并重写onCreateView函数即可。onCreateView函数相当于Activity的onCreate函数。如下:

public class ViewPagerFragment1 extends Fragment {

  private String  text;
  private TextView tv = null;

  public ViewPagerFragment1(String text){
    super();
    this.text = text;
  }

  /**
   * 覆盖此函数,先通过inflater inflate函数得到view最后返回
   */
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.view_pager_fragment_demo1, container, false);
    tv = (TextView)v.findViewById(R.id.viewPagerText);
    tv.setText(text);
    return v;
  }
}

5、示例工程代码:

package cn.trinea.android.demo;

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

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;

public class ViewPagerDemo extends BaseFragmentActivity {

  private static int TOTAL_COUNT = 3;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState, R.layout.view_pager_demo);

    ViewPager vp = (ViewPager)findViewById(R.id.view_pager);
    List<Fragment> fragmentList = new ArrayList<Fragment>();
    List<String> titleList = new ArrayList<String>();
    for (int i = 0; i < TOTAL_COUNT; i++) {
      ViewPagerFragment viewPagerFragment1 = new ViewPagerFragment();
      Bundle bundle = new Bundle();
      bundle.putInt("upImageId", 0);
      bundle.putString("text", "Page " + i);
      viewPagerFragment1.setArguments(bundle);
      titleList.add("title " + i);
      fragmentList.add(viewPagerFragment1);
    }

    vp.setAdapter(new myPagerAdapter(getSupportFragmentManager(), fragmentList, titleList));

  }

  class myPagerAdapter extends FragmentPagerAdapter {

    private List<Fragment> fragmentList;
    private List<String>  titleList;

    public myPagerAdapter(FragmentManager fm, List<Fragment> fragmentList, List<String> titleList) {
      super(fm);
      this.fragmentList = fragmentList;
      this.titleList = titleList;
    }

    @Override
    public Fragment getItem(int arg0) {
      return (fragmentList == null || fragmentList.size() == 0) ? null : fragmentList.get(arg0);
    }

    @Override
    public CharSequence getPageTitle(int position) {
      return (titleList.size() > position) ? titleList.get(position) : "";
    }

    @Override
    public int getCount() {
      return fragmentList == null ? 0 : fragmentList.size();
    }
  }
}

简单效果如下:

2016323102800943.jpg (476×204)

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