ViewPager的学习

参考：慕课网《Android攻城狮的第二门课》

      在完成NaviActivity之前，先把需要使用的一个重要控件ViewPager学习一下。

（1）使用view作为数据源：

private List<View> viewList;
private ViewPager pager;
private PagerTabStrip tab;

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_navi);
        Intent oldpager = getIntent();
        int num = oldpager.getIntExtra("Authorization", 0);
        viewList = new ArrayList<View>();
        /**
         * 通过View对象去作为ViewPager的数据源
         */
        View firstView, secondView;
        titleList = new ArrayList<String>();
        firstView = View.inflate(this, R.layout.activity_machine_inquiry, null);
        titleList.add("机器查询");
        if (num == 0) {
            secondView = View.inflate(this, R.layout.activity_stu_info, null);
            //为ViewPager页卡设置标题
            titleList.add("用户信息");
        }else{
            secondView = View.inflate(this, R.layout.activity_stu_inquiry, null);
            titleList.add("学生查询");
        }
        viewList.add(firstView);
        viewList.add(secondView);

        //为PagerTabStrip设置一些属性
        tab = (PagerTabStrip) findViewById(R.id.stuTab);
        tab.setBackgroundColor(Color.YELLOW);
        tab.setTextColor(Color.RED);
        tab.setDrawFullUnderline(false);
        tab.setTabIndicatorColor(Color.GREEN);

        //初始化ViewPager
        pager = (ViewPager) findViewById(R.id.stuPager);

        //创建PagerAdapter的适配器
        MyPagerAdapter adapter = new MyPagerAdapter(viewList, titleList);

        //ViewPager加载适配器
        pager.setAdapter(adapter);
    }
}

package com.example.wanderingzj.stumanage;

import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;

import java.util.List;

/**
 * Created by samsung on 2015/10/28.
 */
public class MyPagerAdapter extends PagerAdapter {
    private List<View> viewList;
    private List<String> titleList;

    public MyPagerAdapter(List<View> viewList, List<String> titleList){
        this.viewList = viewList;
        this.titleList = titleList;
    }

    /**
     * 返回页卡数量
     * @return
     */
    @Override
    public int getCount() {
        return viewList.size();
    }

    /**
     * View是否来自于对象
     * @param arg0
     * @param arg1
     * @return
     */
    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        return arg0 == arg1;
    }

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

    /**
     * 销毁一个页卡
     * @param container
     * @param position
     * @param object
     */
    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView(viewList.get(position));
    }

    /**
     * 设置ViewPager页卡标题
     * @param position
     * @return
     */
    @Override
    public CharSequence getPageTitle(int position) {
        return titleList.get(position);
    }
}

 （2）使用fragment作为数据源：

private List<Fragment> fragtList;
private ViewPager pager;
private PagerTabStrip tab;

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_navi);
        Intent oldpager = getIntent();
        int num = oldpager.getIntExtra("Authorization", 0);
  
        /**
         * 通过fragment作为ViewPager的数据源
         */
        fragtList = new ArrayList<Fragment>();
        //Activity向fragment传递数值
        Bundle bundle = new Bundle();
        bundle.putInt("Authorization", num);
        machineInquiryActivity = new MachineInquiryActivity();
        machineInquiryActivity.setArguments(bundle);
        fragtList.add(machineInquiryActivity);
        if (num == 0) {
            stuInfoActivity = new StuInfoActivity();
            stuInfoActivity.setArguments(bundle);
            fragtList.add(stuInfoActivity);
        }else{
            stuInquiryActivity = new StuInquiryActivity();
            stuInquiryActivity.setArguments(bundle);
            fragtList.add(stuInquiryActivity);
        }


        //为PagerTabStrip设置一些属性
        tab = (PagerTabStrip) findViewById(R.id.stuTab);
        tab.setBackgroundColor(Color.YELLOW);
        tab.setTextColor(Color.RED);
        tab.setDrawFullUnderline(false);
        tab.setTabIndicatorColor(Color.GREEN);

        //初始化ViewPager
        pager = (ViewPager) findViewById(R.id.stuPager);

        MyFragmentPagerAdapter adapterFrag = new MyFragmentPagerAdapter(getSupportFragmentManager(), fragtList, titleList);
        pager.setAdapter(adapterFrag);
    }
}

package com.example.wanderingzj.stumanage;

import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.view.ViewGroup;

import java.util.List;

/**
 * Created by samsung on 2015/10/28.
 */
public class MyFragmentPagerAdapter extends FragmentStatePagerAdapter {
    private List<Fragment> fragList;
    private List<String> titleList;

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

    @Override
    public Fragment getItem(int position) {
        return fragList.get(position);
    }

    @Override
    public int getCount() {
        return fragList.size();
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return titleList.get(position);
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        return super.instantiateItem(container, position);
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        super.destroyItem(container, position, object);
    }
}

虽然两种方法都顺利的完成了，但在显示PageTitle那却很蛋疼，必须滑动一下才能显示出来。。。

后来经过查询得知可能是由于Support Library兼容性的关系

不过已经打算弃用PagerTabStrip 了,在navi中实现换了新的方法。