ViewPager初步用法(二)

MainAvtivity.class文件：

package com.example.guocong.viewpager;import android.graphics.Color;import android.os.Bundle;import android.support.v4.view.PagerTabStrip;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.view.View;import java.util.ArrayList;import java.util.List;import static java.lang.Boolean.FALSE;public  class MainActivity extends AppCompatActivity {    private ListviewList;    private ViewPager pager;    private PagerTabStrip tab;    private ListtitleList;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        /*        通过View对象作为ViewPager的数据源         */        viewList=new ArrayList();        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);        viewList.add(view1);        viewList.add(view2);        viewList.add(view3);        //为ViewPager页卡设置标题        titleList=new ArrayList();        titleList.add("第一页");        titleList.add("第二页");        titleList.add("第三页");        //为PagerTabStrip设置样式        tab= (PagerTabStrip) findViewById(R.id.tab);        tab.setBackgroundColor(Color.BLACK);        tab.setTextColor(Color.WHITE);        tab.setDrawFullUnderline(FALSE);        tab.setTabIndicatorColor(Color.GREEN);        //初始化viewPager        pager=(ViewPager)findViewById(R.id.pager);        //创建适配器        MyPagerAdapter adapter=new MyPagerAdapter(viewList,titleList);        //ViewPager加载适配器        pager.setAdapter(adapter);    }}

activity_main文件：

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

MyPagerAdapter文件：

package com.example.guocong.viewpager;import android.support.v4.view.PagerAdapter;import android.view.View;import android.view.ViewGroup;import java.util.List;public class MyPagerAdapter extends PagerAdapter {    private ListviewList;    private ListtitleList;    public MyPagerAdapter(ListViewList,ListtitleList)    {        this.viewList=ViewList;        this.titleList=titleList;    }    //返回页卡的数量    @Override    public int getCount() {        return viewList.size();    }    //View是否来自于对象    @Override    public boolean isViewFromObject(View view, Object object) {        return view==object;    }    //实例化一个页卡    @Override    public Object instantiateItem(ViewGroup container, int position) {        container.addView(viewList.get(position));        return viewList.get(position);    }    //销毁一个页卡    @Override    public void destroyItem(ViewGroup container, int position, Object object) {        container.removeView(viewList.get(position));    }    @Override    public CharSequence getPageTitle(int position) {        return titleList.get(position);    }}

另外，还有三个视图事件，根据需要写相关代码。

如果用Fragment作为数据源：

private ListfragList;/*        通过Fragment作为ViewPager的数据源         */        fragList = new ArrayList();        fragList.add(new Fragment1());        fragList.add(new Fragment2());        fragList.add(new Fragment3());        ---MyFragmentPagerAdapter adapter1=new MyFragmentPagerAdapter(getSupportFragmentManager(),fragList,titleList) {        };        pager.setAdapter(adapter1);        pager.setOnPageChangeListener(this);    }    ---

MyFragmentPagerAdapter.class:

package com.example.guocong.viewpager;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import java.util.List;/** * Created by guo on 2017/1/12. */public abstract class MyFragmentPagerAdapter extends FragmentPagerAdapter{    private Listfraglist;    private Listtitlelist;    public MyFragmentPagerAdapter(FragmentManager fm,Listfraglist,Listtitlelist) {        super(fm);        this.fraglist=fraglist;        this.titlelist=titlelist;    }    @Override    public int getCount() {        return fraglist.size();    }    //获取标题    @Override    public CharSequence getPageTitle(int position) {        return titlelist.get(position);    }    @Override    public Fragment getItem(int position) {        return fraglist.get(position);    }}

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