【ViewPager学习1】ViewPager实现广告轮播图

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一、定义本地数据源DataUtil类，为轮播图提供数据源。

DataUtil.java

    package com.administrator.taolvyou.util;  

import android.content.Context;  
import android.widget.ImageView;  

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

/** 
 * 数据源 
 * Created by Administrator on 2018/5/8. 
 */  
public class DataUtil {  
        /** 
         * @param context 
         * @param icons 
         * @return 
         */  
        public static List<ImageView> getHeaderAddInfo(Context context, int icons[]) {  
            List<ImageView> datas = new ArrayList<>();  
            for (int i = 0; i < icons.length; i++) {  
                ImageView icon = new ImageView(context);  
                icon.setScaleType(ImageView.ScaleType.CENTER_CROP);  
                icon.setImageResource(icons[i]);  
                datas.add(icon);  
            }  
            return datas;  
        }  
}  

二、为界面和数据之间添加适配器

MainHeaderAdAdapter.java

package com.administrator.taolvyou.adapter;  

import android.content.Context;  
import android.support.v4.view.PagerAdapter;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.ImageView;  

import java.util.List;  

/** 
 * Created by Administrator on 2018/5/8. 
 */  

public class MainHeaderAdAdapter extends PagerAdapter {  
    protected Context context;  
    protected List<ImageView> images;  
    public MainHeaderAdAdapter(Context context, List<ImageView> images){  
        this.context=context;  
        this.images=images;  
    }  
    @Override  
    public int getCount() {  
        //对数据作非空判断  
        return null!=images?images.size():0;  
    }  

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

    @Override  
    public boolean isViewFromObject(View view, Object object) {  
        return view == object;  
    }  

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

三、编写布局文件

fragment_main.xml

<?xml version="1.0" encoding="utf-8"?>  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical" android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    >  

    <android.support.v4.view.ViewPager  
        android:id="@+id/vpager_main_header_ad"  
        android:layout_width="match_parent"  
        android:layout_height="120dp">  

    </android.support.v4.view.ViewPager>  
    <include  
        android:layout_width="match_parent"  
        android:layout_height="wrap_content"  
        layout="@layout/main_search"  
        />  
    <ImageView  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:src="@mipmap/nav_header_index"  
        android:layout_centerHorizontal="true"  
        android:layout_marginTop="80dp"  
        />  
</RelativeLayout>  

main_search.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="horizontal" android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    android:gravity="center">  

    <!--扫一扫-->  
    <LinearLayout  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:orientation="vertical"  
        android:gravity="center"  
        android:layout_marginLeft="10dp"  
        >  
        <ImageView  
            android:layout_width="24dp"  
            android:layout_height="24dp"  
            android:src="@mipmap/main_scan"/>  
        <TextView  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:text="扫一扫"  
            android:textColor="#ffffff"  
            android:textSize="20sp"/>  


    </LinearLayout>  

    <!--搜索-->  
    <LinearLayout  
        android:layout_width="wrap_content"  
        android:layout_height="48dp"  
        android:orientation="horizontal"  
        android:layout_weight="1"  
        android:background="@mipmap/main_header_sourch"  
        android:gravity="center"  
        android:layout_marginLeft="10dp"  
        android:layout_marginRight="10dp">  

        <ImageView  
            android:layout_width="24dp"  
            android:layout_height="24dp"  
            android:src="@mipmap/search"  


            />  
        <EditText  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:hint="目的地/景点/酒店/门票"  
            android:background="@null"  
            android:textSize="18sp"/>  


    </LinearLayout>  

    <!--消息-->  
    <LinearLayout  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:orientation="vertical"  
        android:gravity="center"  
        android:layout_marginRight="10dp">  
        <ImageView  
            android:layout_width="24dp"  
            android:layout_height="24dp"  
            android:src="@mipmap/news"/>  
        <TextView  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:text="消息"  
            android:textColor="#ffffff"  
            android:textSize="20sp"/>  


    </LinearLayout>  

</LinearLayout>  

如果xml文件的地方，图片处报红，请下载本文配套代码，从中提取该图片
四、Java代码中调用

MainHeaderAdAdapter.java

package com.administrator.taolvyou.fragment;  
import android.os.Bundle;  
import android.support.annotation.Nullable;  
import android.support.v4.app.Fragment;  
import android.support.v4.view.ViewPager;  
import android.view.LayoutInflater;  
import android.view.View;  
import android.view.ViewGroup;  

import com.administrator.taolvyou.R;  
import com.administrator.taolvyou.adapter.MainHeaderAdAdapter;  
import com.administrator.taolvyou.util.DataUtil;  


/** 
 * 主界面视图 
 */  
public class MainFragment extends Fragment{  

    protected  int [] icons={R.mipmap.header_pic_ad1, R.mipmap.header_pic_ad2,R.mipmap.header_pic_ad1};  
    protected ViewPager mVPagerHeaderAd;//广告头  

    @Nullable  
    @Override  
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {  
        return inflater.inflate(R.layout.fragment_main,container,false);  
    }  

    @Override  
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {  
        super.onActivityCreated(savedInstanceState);  

        mVPagerHeaderAd= (ViewPager) getView().findViewById(R.id.vpager_main_header_ad);  

        MainHeaderAdAdapter adapter=new MainHeaderAdAdapter(getActivity(), DataUtil.getHeaderAddInfo(getActivity(),icons));  
        mVPagerHeaderAd.setAdapter(adapter);  
    }  
}  

运行效果：

项目Demo下载

https://download.csdn.net/download/weimeig/10400834