Android使用ViewPager实现启动引导页

<?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="com.example.nanchen.guidepagedemo.GuideActivity">
 
 <android.support.v4.view.ViewPager
 android:id="@+id/guide_vp"
 android:layout_width="match_parent"
 android:layout_height="match_parent">
 </android.support.v4.view.ViewPager>
 <LinearLayout
 android:id="@+id/guide_ll_point"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:orientation="horizontal"
 android:layout_alignParentBottom="true"
 android:layout_marginBottom="40dp"
 android:gravity="center_horizontal">
 </LinearLayout>
 <ImageButton
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/guide_ib_start"
 android:src="@mipmap/btn_start"
 android:layout_centerHorizontal="true"
 android:layout_above="@+id/guide_ll_point"
 android:background="@null"
 android:visibility="gone"/>
</RelativeLayout>

package com.example.nanchen.guidepagedemo;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import java.util.List;

/**

 * Created by 南尘 on 2016/7/10.

 */
public class GuidePageAdapter extends PagerAdapter {
 private List<View> viewList;
 public GuidePageAdapter(List<View> viewList) {
 this.viewList = viewList;

 }
 /**

 * @return 返回页面的个数

 */

 @Override
 public int getCount() {
 if (viewList != null){
  return viewList.size();
 }
 return 0;
 }

 /**
 * 判断对象是否生成界面
 * @param view
 * @param object
 * @return
 */
 @Override
 public boolean isViewFromObject(View view, Object object) {
 return view == object;

 } 

 /**
 * 初始化position位置的界面
 * @param container
 * @param position
 * @return
 */
 @Override
 public Object instantiateItem(ViewGroup container, int position) {
 container.addView(viewList.get(position));
 return viewList.get(position);

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

 }
}

package com.example.nanchen.guidepagedemo;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import java.util.ArrayList;
import java.util.List;
/**

 * 实现首次启动的引导页面

 */
public class GuideActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener{
 
 private ViewPager vp;
 private int []imageIdArray;//图片资源的数组
 private List<View> viewList;//图片资源的集合
 private ViewGroup vg;//放置圆点
//实例化原点View
 private ImageView iv_point;
 private ImageView []ivPointArray;
 //最后一页的按钮
 private ImageButton ib_start;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
 setContentView(R.layout.activity_guide);
 ib_start = (ImageButton) findViewById(R.id.guide_ib_start);
 ib_start.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  startActivity(new Intent(GuideActivity.this,MainActivity.class));
  finish();
  }

 });
 //加载ViewPager
 initViewPager(); 

 //加载底部圆点
 initPoint();
 }
 
 /**
 * 加载底部圆点
 */

 private void initPoint() {

 //这里实例化LinearLayout

 vg = (ViewGroup) findViewById(R.id.guide_ll_point);

 //根据ViewPager的item数量实例化数组

 ivPointArray = new ImageView[viewList.size()];

 //循环新建底部圆点ImageView，将生成的ImageView保存到数组中

 int size = viewList.size();
 for (int i = 0;i<size;i++){
  iv_point = new ImageView(this);
  iv_point.setLayoutParams(new ViewGroup.LayoutParams(20,20));
  iv_point.setPadding(30,0,30,0);//left,top,right,bottom
  ivPointArray[i] = iv_point;
  //第一个页面需要设置为选中状态，这里采用两张不同的图片

  if (i == 0){

  iv_point.setBackgroundResource(R.mipmap.full_holo);

  }else{
  iv_point.setBackgroundResource(R.mipmap.empty_holo);
  }
  //将数组中的ImageView加入到ViewGroup
  vg.addView(ivPointArray[i]);

 }
 }
 /**
 * 加载图片ViewPager
 */
private void initViewPager() {
 vp = (ViewPager) findViewById(R.id.guide_vp);
 //实例化图片资源
 imageIdArray = new int[]{R.mipmap.guide1,R.mipmap.guide2,R.mipmap.guide3};
 viewList = new ArrayList<>();
 //获取一个Layout参数，设置为全屏
 LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
  LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT);
 //循环创建View并加入到集合中
 int len = imageIdArray.length;
 for (int i = 0;i<len;i++){
  //new ImageView并设置全屏和图片资源
  ImageView imageView = new ImageView(this);
  imageView.setLayoutParams(params);
  imageView.setBackgroundResource(imageIdArray[i]);
  //将ImageView加入到集合中
  viewList.add(imageView);
 }
 //View集合初始化好后，设置Adapter
 vp.setAdapter(new GuidePageAdapter(viewList));
 //设置滑动监听
 vp.setOnPageChangeListener(this);
 }
 @Override
 public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
 }

 /**
 * 滑动后的监听
 * @param position
 */
 @Override
 public void onPageSelected(int position) {
 //循环设置当前页的标记图
 int length = imageIdArray.length;
 for (int i = 0;i<length;i++){
  ivPointArray[position].setBackgroundResource(R.mipmap.full_holo);
  if (position != i){
  ivPointArray[i].setBackgroundResource(R.mipmap.empty_holo);
  }
 }
 //判断是否是最后一页，若是则显示按钮
 if (position == imageIdArray.length - 1){
  ib_start.setVisibility(View.VISIBLE);
 }else {
  ib_start.setVisibility(View.GONE);
 }
 }
 @Override
 public void onPageScrollStateChanged(int state) {
 
 }
}