android 之ViewPager左右滑动切换界面

这是谷歌官方给我们提供的一个兼容低版本安卓设备的软件包，里面包囊了只有在安卓3.0以上可以使用的api。而viewpager就是其中之一利用它，我们可以做很多事情，从最简单的导航，到页面菜单等等。那如何使用它呢，与LisstView类似，我们也需要一个适配器，他就是PagerAdapter。看一个简单的例子：

main.xml

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

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <include layout="@layout/item_header" />

        <android.support.v4.view.ViewPager
            android:id="@+id/guidePages"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <!-- 指引图标 -->

    <LinearLayout
        android:id="@+id/viewGroup"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:layout_marginBottom="40dp"
        android:gravity="center_horizontal"
        android:orientation="horizontal" >
    </LinearLayout>

</FrameLayout>

item01:

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

    <LinearLayout
        android:id="@+id/linearLayout02"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/divider_horizontal_line"
        android:orientation="vertical" />

    <ImageView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/feature_guide_0" />

    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/bg"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="30px"
            android:background="@drawable/divider_horizontal_line"
            android:orientation="vertical" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingLeft="30px"
            android:paddingRight="30px"
            android:text="@string/text1"
            android:textColor="#000000" />
    </LinearLayout>

</LinearLayout>

MainActivity:

package com.ly.test;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.os.Parcelable;
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.view.ViewGroup;
import android.view.Window;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageView;

/**
 * Android实现左右滑动指引效果
 * 
 * @Description: Android实现左右滑动指引效果
 * 
 */
public class GuideViewTestActivity extends Activity {
	private ViewPager viewPager;
	private ArrayList<View> pageViews;
	private ImageView imageView;
	private ImageView[] imageViews;
	private ViewGroup main;// 包裹滑动图片LinearLayout
	private ViewGroup group;// 包裹小圆点的LinearLayout

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);

		LayoutInflater inflater = getLayoutInflater();
		pageViews = new ArrayList<View>();
		pageViews.add(inflater.inflate(R.layout.item05, null));
		pageViews.add(inflater.inflate(R.layout.item06, null));
		pageViews.add(inflater.inflate(R.layout.item01, null));
		pageViews.add(inflater.inflate(R.layout.item02, null));
		pageViews.add(inflater.inflate(R.layout.item03, null));
		pageViews.add(inflater.inflate(R.layout.item04, null));

		// 有几个布局页面就有几个圆点图片
		imageViews = new ImageView[pageViews.size()];
		main = (ViewGroup) inflater.inflate(R.layout.main, null);

		viewPager = (ViewPager) main.findViewById(R.id.guidePages);
		group = (ViewGroup) main.findViewById(R.id.viewGroup);

		// 通过for循环设置圆点图片的布局
		for (int i = 0; i < pageViews.size(); i++) {
			imageView = new ImageView(GuideViewTestActivity.this);
			imageView.setLayoutParams(new LayoutParams(20, 20));
			imageView.setPadding(20, 0, 20, 0);
			imageViews[i] = imageView;

			if (i == 0) {
				// 默认选中第一张图片
				imageViews[i]
						.setBackgroundResource(R.drawable.page_indicator_focused);
			} else {
				imageViews[i].setBackgroundResource(R.drawable.page_indicator);
			}
			group.addView(imageViews[i]);
		}
		setContentView(main);

		viewPager.setAdapter(new GuidePageAdapter());
		viewPager.setOnPageChangeListener(new GuidePageChangeListener());
	}

	// 指引页面数据适配器
	class GuidePageAdapter extends PagerAdapter {

		@Override
		public int getCount() {
			return pageViews.size();
		}

		@Override
		public boolean isViewFromObject(View arg0, Object arg1) {
			return arg0 == arg1;
		}

		@Override
		public int getItemPosition(Object object) {
			return super.getItemPosition(object);
		}

		@Override
		public void destroyItem(View arg0, int arg1, Object arg2) {
			((ViewPager) arg0).removeView(pageViews.get(arg1));
		}

		@Override
		public Object instantiateItem(View arg0, int arg1) {
			((ViewPager) arg0).addView(pageViews.get(arg1));
			return pageViews.get(arg1);
		}

		@Override
		public void restoreState(Parcelable arg0, ClassLoader arg1) {

		}

		@Override
		public Parcelable saveState() {
			return null;
		}

		@Override
		public void startUpdate(View arg0) {
		}

		@Override
		public void finishUpdate(View arg0) {
		}
	}

	// 指引页面更改事件监听器
	class GuidePageChangeListener implements OnPageChangeListener {

		@Override
		public void onPageScrollStateChanged(int arg0) {
		}

		@Override
		public void onPageScrolled(int arg0, float arg1, int arg2) {
		}

		@Override
		public void onPageSelected(int arg0) {
			for (int i = 0; i < imageViews.length; i++) {
				imageViews[arg0]
						.setBackgroundResource(R.drawable.page_indicator_focused);
				if (arg0 != i) {
					imageViews[i]
							.setBackgroundResource(R.drawable.page_indicator);
				}
			}
		}
	}
}

没有列出所有的代码,详见附件