viewPager监听示例

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本文章是主要探讨viewPager监听的四个方法的作用

首先需要两个布局文件

主布局:

<?xml version="1.0" encoding="utf-8"?><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="my.microsoft.com.viewpagerdemo2.MainActivity">    <android.support.v4.view.ViewPager        android:id="@+id/viewpager"        android:layout_width="match_parent"        android:layout_height="match_parent">        <android.support.v4.view.PagerTabStrip            android:id="@+id/tabstrip"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            >        </android.support.v4.view.PagerTabStrip>    </android.support.v4.view.ViewPager></RelativeLayout>

item布局:

<?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">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="tab1"/></LinearLayout>

MainActivity

代码:

package my.microsoft.com.viewpagerdemo2;import android.graphics.Color;import android.support.v4.view.PagerAdapter;import android.support.v4.view.PagerTabStrip;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.text.Layout;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    private ViewPager viewPager=null;    private PagerTabStrip pagerTabStrip=null;    List<View> viewlist=new ArrayList<>();    List<String> titlelist=new ArrayList<>();    LayoutInflater layoutInflater=null;    Myadapter myadapter=null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        viewPager= (ViewPager) this.findViewById(R.id.viewpager);        pagerTabStrip= (PagerTabStrip) this.findViewById(R.id.tabstrip);        //标签背景色        pagerTabStrip.setBackgroundColor(Color.YELLOW);        //标签下划线颜色        pagerTabStrip.setTabIndicatorColor(Color.BLUE);        layoutInflater=LayoutInflater.from(this);        View view1= layoutInflater.inflate(R.layout.tab1,null);        viewlist.add(view1);        titlelist.add("title");        myadapter=new Myadapter();        viewPager.setAdapter(myadapter);        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {            //页面被滑动,或者被触碰的时候被调用            @Override            public void onPageScrolled(int a, float b, int c) {                Log.i("aaa","--a->>"+a);                Log.i("aaa","--b->>"+b);                Log.i("aaa","--c->>"+c);                Log.i("aaa","---------------------------------------------");            }            //一个新的页面被选中时调用            @Override            public void onPageSelected(int position) {                Log.i("aaa","--position->>"+position);            }            //滚动状态更改时调用            @Override            public void onPageScrollStateChanged(int d) {                //在这个方法中加载下一页网络数据比较合理,因为这个方法如果执行了,那一定是开启了一个新的页面                View view2=layoutInflater.inflate(R.layout.tab1,null);                viewlist.add(view2);                titlelist.add("new title");                myadapter.notifyDataSetChanged();                Log.i("aaa","*****-d-****"+d);                Log.i("aaa","******************");            }        });    }    class Myadapter extends PagerAdapter{        //标签的个数        @Override        public int getCount() {            return viewlist.size();        }        @Override        public Object instantiateItem(ViewGroup container, int position) {            ((ViewPager)container).addView(viewlist.get(position));            return viewlist.get(position);        }        @Override        public void destroyItem(ViewGroup container, int position, Object object) {            ((ViewPager)container).removeView(viewlist.get(position));        }        @Override        public boolean isViewFromObject(View view, Object object) {            return view==object;        }        @Override        public CharSequence getPageTitle(int position) {            return titlelist.get(position);        }    }}

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