广告条目的android代码，常使用

广告条目的android代码，来源黑马

注意： 该项目是以android控件ViewPager实现的方法
所含功能：
手划或者自动调转图片。

package com.sdingba.su.adview;

import android.os.Handler;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    private ViewPager viewPager;

    private LinearLayout pointGroup;

    private TextView iamgeDesc;

    // 图片资源ID
    private final int[] imageIds = { R.drawable.a, R.drawable.b, R.drawable.c,
            R.drawable.d, R.drawable.e };

    //图片标题集合
    private final String[] imageDescriptions = {
            "巩俐不低俗，我就不能低俗",
            "扑树又回来啦！再唱经典老歌引万人大合唱",
            "揭秘北京电影如何升级",
            "乐视网TV版大派送",
            "热血屌丝的反杀"
    };


    private ArrayList<ImageView> imageList;

    /** * 上一个页面的位置 */
    protected int lastPosition;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        viewPager = (ViewPager) findViewById(R.id.viewpager);
        pointGroup = (LinearLayout) findViewById(R.id.point_group);
        iamgeDesc = (TextView) findViewById(R.id.image_desc);
        iamgeDesc.setText(imageDescriptions[0]);


        imageList = new ArrayList<ImageView>();
        for (int i = 0; i <imageIds.length; i++) {


            //初始化图片资源
            ImageView image = new ImageView(this);
            image.setBackgroundResource(imageIds[i]);
            imageList.add(image);

            //添加指示点//添加图片下面的点数位置
            ImageView point =new ImageView(this);
            //LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(5dp,5dp);或下面的一句话
            LinearLayout.LayoutParams params =
                    new LinearLayout.LayoutParams(
                            LinearLayout.LayoutParams.WRAP_CONTENT,
                            LinearLayout.LayoutParams.WRAP_CONTENT);
            params.rightMargin = 20;
            point.setLayoutParams(params);

            point.setBackgroundResource(R.drawable.point_bg);
            if(i==0){
                point.setEnabled(true);
            }else{
                point.setEnabled(false);
            }
            pointGroup.addView(point);
        }

        viewPager.setAdapter(new MyPagerAdapter());

// viewPager.setCurrentItem(Integer.MAX_VALUE/2 - (Integer.MAX_VALUE/2%imageList.size())) ;

        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            /** * 页面切换后调用 * position 新的页面位置 */
            public void onPageSelected(int position) {

                position = position%imageList.size();

                //设置文字描述内容
                iamgeDesc.setText(imageDescriptions[position]);

                //改变指示点的状态
                //把当前点enbale 为true
                pointGroup.getChildAt(position).setEnabled(true);
                //把上一个点设为false
                pointGroup.getChildAt(lastPosition).setEnabled(false);
                lastPosition = position;

            }

            @Override
            /** * 页面正在滑动的时候，回调 */
            public void onPageScrolled(int position, float positionOffset,
                                       int positionOffsetPixels) {
            }

            @Override
            /** * 当页面状态发生变化的时候，回调 */
            public void onPageScrollStateChanged(int state) {

            }
        });

         /* * 自动循环： * 1、定时器：Timer * 2、开子线程 while true 循环 * 3、ColckManager * 4、 用handler 发送延时信息，实现循环 */
        isRunning = true;
        handler.sendEmptyMessageDelayed(0, 2000);
    }

    /** * 判断是否自动滚动 */
    private boolean isRunning = false;

    private Handler handler = new Handler(){
        public void handleMessage(android.os.Message msg) {

            //让viewPager 滑动到下一页
            viewPager.setCurrentItem(viewPager.getCurrentItem()+1);
            if(isRunning){
                handler.sendEmptyMessageDelayed(0, 2000);
            }
        }
    };

    @Override
    protected void onDestroy() {
        isRunning = false;
    };



    /******************************************************************/
    private class MyPagerAdapter extends PagerAdapter {

        @Override
        /** * 获得页面的总数 */
        public int getCount() {
            return Integer.MAX_VALUE;
        }

        @Override
        /** * 获得相应位置上的view * container view的容器，其实就是viewpager自身 * position 相应的位置 */
        public Object instantiateItem(ViewGroup container, int position) {

            System.out.println("instantiateItem ::"+position);

            // 给 container 添加一个view
            container.addView(imageList.get(position%imageList.size()));
            //返回一个和该view相对的object
            return imageList.get(position%imageList.size());
        }

        @Override
        /** * 判断 view和object的对应关系 */
        public boolean isViewFromObject(View view, Object object) {
// if(view == object){
// return true;
// }else{
// return false;
// }
            return view == object;
        }

        @Override
        /** * 销毁对应位置上的object */
        public void destroyItem(ViewGroup container, int position, Object object) {
            System.out.println("destroyItem ::"+position);

            container.removeView((View) object);
            object = null;
        }
    }
}

<?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" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.sdingba.su.adview.MainActivity">

    <android.support.v4.view.ViewPager  android:id="@+id/viewpager" android:layout_width="match_parent" android:layout_height="200dp" />

    <LinearLayout  android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignBottom="@id/viewpager" android:background="#33000000" android:orientation="vertical" >

        <TextView  android:id="@+id/image_desc" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:text="@string/app_name" android:textColor="@android:color/white" android:textSize="18sp" />

        <LinearLayout  android:id="@+id/point_group" android:layout_width="wrap_content" android:layout_gravity="center_horizontal" android:layout_height="wrap_content" >
        </LinearLayout>
    </LinearLayout>
</RelativeLayout>

point_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >

    <item android:drawable="@drawable/point_nomal" android:state_enabled="false"/>
    <item android:drawable="@drawable/point_focured" android:state_enabled="true"/>

</selector>

point_focured.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval" >

    <size android:width="5dp" android:height="5dp"/>
    <solid android:color="#55000000"/>

</shape>

point_nomal.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval" >

    <size android:width="5dp" android:height="5dp"/>
    <solid android:color="#aaFFFFFF"/>

</shape>