Android开发之使用ViewPager做引导页面

引导页面相信大家都不会陌生，安装了一个新的App后第一次打开，都会有类似下图，相当于说明文档

实现效果

程序目录结构

在主layout里main.xml定义一个帧布局，在viewPager上有多少页就显示多少个点

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

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

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|center_horizontal"
        android:orientation="horizontal" >

        <ImageView
            android:id="@+id/icon_1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="30dp"
            android:contentDescription="@string/content_description"
            android:src="@drawable/page_icon" />

        <ImageView
            android:id="@+id/icon_2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="30dp"
            android:contentDescription="@string/content_description"
            android:src="@drawable/page_icon" />

        <ImageView
            android:id="@+id/icon_3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/content_description"
            android:src="@drawable/page_icon" />
    </LinearLayout>

</FrameLayout>

每一个View的布局pager1.xml

<?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:background="@drawable/image1"
    android:orientation="vertical" >

    <Button
        android:id="@+id/btn_in_first"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="第一页" />

</LinearLayout>

其它两个view类似

在主Activity中

package com.example.viewpagerdemo;

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

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends Activity {

	private ViewPager viewPager = null;
	private ImageView img1, img2, img3;
	private ArrayList<String> titles;
	private int curIndex = -1;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		initWidgets();
		// 把要显示的View装入数组
		LayoutInflater li = LayoutInflater.from(this);
		View view1 = li.inflate(R.layout.pager1, null);
		View view2 = li.inflate(R.layout.pager2, null);
		View view3 = li.inflate(R.layout.pager3, null);

		// 添加页面
		final ArrayList<View> views = new ArrayList<View>();
		views.add(view1);
		views.add(view2);
		views.add(view3);

		// 添加标题
		titles = new ArrayList<String>();
		titles.add("tab1");
		titles.add("tab2");
		titles.add("tab3");

		picViewPagerAdapter pagerAdapter = new picViewPagerAdapter(views);
		viewPager.setAdapter(pagerAdapter);
		curIndex = 1;
		viewPager.setCurrentItem(curIndex);
		img2.setImageResource(R.drawable.page_icon_sel);

		viewPager.setOnPageChangeListener(new OnPageChangeListener() {

			@Override
			public void onPageSelected(int arg0) {
				// TODO Auto-generated method stub
				switch (arg0) {
				case 0:
					img1.setImageResource(R.drawable.page_icon_sel);
					img2.setImageResource(R.drawable.page_icon);
					img3.setImageResource(R.drawable.page_icon);
					break;
				case 1:
					img2.setImageResource(R.drawable.page_icon_sel);
					img1.setImageResource(R.drawable.page_icon);
					img3.setImageResource(R.drawable.page_icon);
					break;
				case 2:
					img3.setImageResource(R.drawable.page_icon_sel);
					img2.setImageResource(R.drawable.page_icon);
					img1.setImageResource(R.drawable.page_icon);
					break;
				default:
					break;
				}
				curIndex = arg0;
				System.out.println("[MainActivity->]currIndex = " + curIndex);
			}

			@Override
			public void onPageScrolled(int arg0, float arg1, int arg2) {
				// TODO Auto-generated method stub

			}

			@Override
			public void onPageScrollStateChanged(int arg0) {
				// TODO Auto-generated method stub

			}
		});
	}

	private void initWidgets() {
		viewPager = (ViewPager) findViewById(R.id.viewpager);
		img1 = (ImageView) findViewById(R.id.icon_1);
		img2 = (ImageView) findViewById(R.id.icon_2);
		img3 = (ImageView) findViewById(R.id.icon_3);
	}

	/**
	 * 为ViewPager添加适配器
	 * 
	 * @author Administrator
	 * 
	 */
	class picViewPagerAdapter extends PagerAdapter {

		private List<View> listViews;

		public picViewPagerAdapter(List<View> list) {
			listViews = list;
		}

		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return listViews.size();
		}

		@Override
		public boolean isViewFromObject(View arg0, Object arg1) {
			// TODO Auto-generated method stub
			return arg0 == arg1;
		}

		@Override
		public void destroyItem(View container, int position, Object object) {
			((ViewPager) container).removeView(listViews.get(position));
		}

		@Override
		public CharSequence getPageTitle(int position) {
			return titles.get(position);
		}

		@Override
		public Object instantiateItem(View container, int position) {
			((ViewPager) container).addView(listViews.get(position));
			return listViews.get(position);
		}
	}
}

每个小圆点的改变是通过viewpager监听器去改变的

viewPager.setOnPageChangeListener(new OnPageChangeListener() {

			@Override
			public void onPageSelected(int arg0) {
				// TODO Auto-generated method stub
				switch (arg0) {
				case 0:
					img1.setImageResource(R.drawable.page_icon_sel);
					img2.setImageResource(R.drawable.page_icon);
					img3.setImageResource(R.drawable.page_icon);
					break;
				case 1:
					img2.setImageResource(R.drawable.page_icon_sel);
					img1.setImageResource(R.drawable.page_icon);
					img3.setImageResource(R.drawable.page_icon);
					break;
				case 2:
					img3.setImageResource(R.drawable.page_icon_sel);
					img2.setImageResource(R.drawable.page_icon);
					img1.setImageResource(R.drawable.page_icon);
					break;
				default:
					break;
				}
				curIndex = arg0;
				System.out.println("[MainActivity->]currIndex = " + curIndex);
			}

			@Override
			public void onPageScrolled(int arg0, float arg1, int arg2) {
				// TODO Auto-generated method stub

			}

			@Override
			public void onPageScrollStateChanged(int arg0) {
				// TODO Auto-generated method stub

			}
		});

完整Demo下载：http://download.csdn.net/detail/deng0zhaotai/7272609