<?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"
  android:orientation="vertical"
  >
  <ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:scaleType="centerCrop"
    android:src="@mipmap/view1"/>
</LinearLayout>

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout android:orientation="vertical"
android:layout_height="match_parent"
android:layout_width="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<!-- 切換卡 -->
<android.support.v4.view.ViewPager
  android:layout_height="wrap_content"
  android:layout_width="match_parent"
  android:id="@+id/viewPager"></android.support.v4.view.ViewPager>
<!-- 點點 -->
<LinearLayout
  android:orientation="horizontal"
  android:layout_height="wrap_content"
  android:layout_width="fill_parent"
  android:id="@+id/viewGroup"
  android:layout_alignParentBottom="true"
  android:gravity="center_horizontal"
  android:layout_marginBottom="40dp"></LinearLayout>
</RelativeLayout>

package com.yztc.lx.homework;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.ViewGroup.LayoutParams;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import java.util.ArrayList;
import java.util.List;
/**
 * Created by Lx on 2016/8/6.
 */
public class Layout1Activity extends Activity {
  private ViewPager viewPager;
  private PagerAdapter adapter;
  private List<View> viewPages = new ArrayList<>();
  //包裹點點的LinearLayout
  private ViewGroup group;
  private ImageView imageView;
  //定義一個ImageVIew數(shù)組，來存放生成的小園點
  private ImageView[] imageViews;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout1);
    initView();
    initPageAdapter();
    initPointer();
    initEvent();
  }
  //為控件綁定事件,綁定適配器
  private void initEvent() {
    viewPager.setAdapter(adapter);
    viewPager.addOnPageChangeListener(new GuidePageChangeListener());
  }
  //初始化ViewPager
  private void initPageAdapter() {
    /**
     * 對于這幾個想要動態(tài)載入的page頁面，使用LayoutInflater.inflate()來找到其布局文件，并實例化為View對象
     */
    LayoutInflater inflater = LayoutInflater.from(this);
    View page1 = inflater.inflate(R.layout.page1, null);
    View page2 = inflater.inflate(R.layout.page2, null);
    View page3 = inflater.inflate(R.layout.page3, null);
    //添加到集合中
    viewPages.add(page1);
    viewPages.add(page2);
    viewPages.add(page3);
    adapter = new PagerAdapter() {
      //獲取當前界面?zhèn)€數(shù)
      @Override
      public int getCount() {
        return viewPages.size();
      }
      //判斷是否由對象生成頁面
      @Override
      public boolean isViewFromObject(View view, Object object) {
        return view == object;
      }
      @Override
      public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView(viewPages.get(position));
      }
      //返回一個對象，這個對象表明了PagerAdapter適配器選擇哪個對象放在當前的ViewPager中
      @Override
      public Object instantiateItem(ViewGroup container, int position) {
        View view = viewPages.get(position);
        container.addView(view);
        return view;
      }
    };
  }
  //綁定控件
  private void initView() {
    viewPager = (ViewPager) findViewById(R.id.viewPager);
    group = (ViewGroup) findViewById(R.id.viewGroup);
  }
  //初始化下面的小圓點的方法
  private void initPointer() {
    //有多少個界面就new多長的數(shù)組
    imageViews = new ImageView[viewPages.size()];
    for (int i = 0; i < imageViews.length; i++) {
      imageView = new ImageView(this);
      //設置控件的寬高
      imageView.setLayoutParams(new LayoutParams(25, 25));
      //設置控件的padding屬性
      imageView.setPadding(20, 0, 20, 0);
      imageViews[i] = imageView;
      //初始化第一個page頁面的圖片的原點為選中狀態(tài)
      if (i == 0) {
        //表示當前圖片
        imageViews[i].setBackgroundResource(R.mipmap.page_indicator_focused);
        /**
         * 在java代碼中動態(tài)生成ImageView的時候
         * 要設置其BackgroundResource屬性才有效
         * 設置ImageResource屬性無效
         */
      } else {
        imageViews[i].setBackgroundResource(R.mipmap.page_indicator_unfocused);
      }
      group.addView(imageViews[i]);
    }
  }
  //ViewPager的onPageChangeListener監(jiān)聽事件，當ViewPager的page頁發(fā)生變化的時候調(diào)用
  public class GuidePageChangeListener implements ViewPager.OnPageChangeListener {
    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
    }
    //頁面滑動完成后執(zhí)行
    @Override
    public void onPageSelected(int position) {
      //判斷當前是在那個page，就把對應下標的ImageView原點設置為選中狀態(tài)的圖片
      for (int i = 0; i < imageViews.length; i++) {
        imageViews[position].setBackgroundResource(R.mipmap.page_indicator_focused);
        if (position != i) {
          imageViews[i].setBackgroundResource(R.mipmap.page_indicator_unfocused);
        }
      }
    }
    //監(jiān)聽頁面的狀態(tài)，0--靜止 1--滑動  2--滑動完成
    @Override
    public void onPageScrollStateChanged(int state) {
    }
  }
}