Android学习——ViewPage实现多页面滑动效果

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent"  tools:context=".MainActivity">
  <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.PagerTitleStrip
            android:id="@+id/PagerTitleStrip"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="top"
            >
          </android.support.v4.view.PagerTitleStrip>
</android.support.v4.view.ViewPager>
</RelativeLayout>

package xiaocool.net.viewpager2;

import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.PagerTitleStrip;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

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


public class MainActivity extends ActionBarActivity {

    private ViewPager viewPager;
    private PagerTitleStrip pagerTitleStrip;

    private MyAdapter adapter=null;
    private List<View> list=null; //装载已加载的界面
    private  List<String> title=null;//装载已加载的界面对应的标题
   private LayoutInflater inflater=null;//声明一个动态布局对象
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        viewPager=(ViewPager)this.findViewById(R.id.ViewPager);
        pagerTitleStrip=(PagerTitleStrip)this.findViewById(R.id.PagerTitleStrip);
         adapter=new MyAdapter();
        //加载布局
        inflater= LayoutInflater.from(MainActivity.this);
        //第一次被加载的布局对象
        View tab=inflater.inflate(R.layout.tab1,null);

        list=new ArrayList<View>();
        list.add(tab);

        title=new ArrayList<String>();
        title.add("title");
        //先初始化页面
        viewPager.setAdapter(adapter);
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int i, float v, int i2) {

            }

            @Override
            public void onPageSelected(int i) {


            }
            //当点击当前页面，还没有产生侧滑是 主要再次完成界面的加载
            //在这里开启线程去加载网络的数据，更新ui的操作
            @Override
            public void onPageScrollStateChanged(int i) {
                View view=inflater.inflate(R.layout.tab1,null);
                list.add(view);
                title.add("new view");
                //刷新数据
                adapter.notifyDataSetChanged();


            }
        });
    }
    //布局适配器
    public class MyAdapter extends PagerAdapter{
        @Override
        public int getCount() {
            return list.size();
        }
       //初始化适配器
        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            ((ViewPager)container).addView(list.get(position));
            return list.get(position);
        }

       //从一个布局到另一个布局，销毁前一个布局
        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            //super.destroyItem(container, position, object);
            ((ViewPager)container).removeView(list.get(position));
        }
        //得到每一个界面的布局
          @Override
        public CharSequence getPageTitle(int position) {
            return title.get(position);
        }

        @Override
        public boolean isViewFromObject(View view, Object o) {
            return view==o;//判断当前view和Object是否是同一个对象
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}