viewpager

用view实现页卡 添加标题使用PagerTabStrip方法 在xml文件中加在viewpager中

public class MainActivity extends AppCompatActivity {
    ViewPager VP;
    public List<View> viewList;
    public View view1,view2,view3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        VP=(ViewPager) findViewById(R.id.pager);
        //LayoutInfalater用来实例化一个文件成为view
        LayoutInflater inflater=getLayoutInflater();
        view1=inflater.inflate(R.layout.layout1,null);
        view2=inflater.inflate(R.layout.layout2,null);
        view3=inflater.inflate(R.layout.layout,null);
        viewList.add(view2);
        viewList.add(view1);
        viewList.add(view3);

        pagerAdapter pa=new pagerAdapter(viewList);
        VP.setAdapter(pa);

    }

}


public class pagerAdapter extends PagerAdapter {

    public List<View> viewList;
    //不懂为啥传给他  下面也没用到啊  好像用到了   唉  愁人
    public pagerAdapter(List<View> viewList){
        this.viewList=viewList;
    }

    @Override
    //获取页卡数目
    public int getCount() {
        return  viewList.size();
    }

    @Override
    //检测是否显示了
    public boolean isViewFromObject(View view, Object object) {
        return view==object;
    }

    @Override
    //清除一个页卡
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView(viewList.get(position));
    }

    @Override
    //实例化一个页卡
    public Object instantiateItem(ViewGroup container, int position) {
        container.addView(viewList.get(position));
        return viewList.get(position);
    }
}

用fragment当作页卡：
1.建立fragment：`
public class Fragment1 extends Fragment{

@Override
//实现该方法  虽然不知道都啥意思  文档也看不懂
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    return inflater.inflate(R.layout.view1, container, false);
}

}
2.建立FragmentPagerAdapter

public class MyFragmentPagerAdapter extends FragmentPagerAdapter{
//装fragment的集合
    private List<Fragment>fragList;
    //标题集合
    private List<String>titleList;
    public MyFragmentPagerAdapter(FragmentManager fm,List<Fragment> fragList,List<String>titleList) {
        super(fm);
        // TODO Auto-generated constructor stub
        this.fragList=fragList;
        this.titleList=titleList;
    }

    @Override
    public Fragment getItem(int arg0) {
        // TODO Auto-generated method stub
        return fragList.get(arg0);
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return fragList.size();
    }

    @Override
    public CharSequence getPageTitle(int position) {
        // TODO Auto-generated method stub
        return titleList.get(position);
    }


}



                                                                             2017.5.5