ViewPager多页面滑动效果

参考文档：点击打开链接

基于上篇文档，主要增加了页头和滑动图片：

<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.test.guideactivity.MainActivity" >

     <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="50.0dip"
        android:background="#FFFFFF" >

        <TextView
            android:id="@+id/text1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1.0"
            android:gravity="center"
            android:text="页卡1"
            android:textColor="#000000"
            android:textSize="22.0dip" />

        <TextView
            android:id="@+id/text2"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1.0"
            android:gravity="center"
            android:text="页卡2"
            android:textColor="#000000"
            android:textSize="22.0dip" />

        <TextView
            android:id="@+id/text3"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1.0"
            android:gravity="center"
            android:text="页卡3"
            android:textColor="#000000"
            android:textSize="22.0dip" />
    </LinearLayout>

    <ImageView
        android:id="@+id/cursor"
        android:layout_below="@id/linearLayout1"
        android:layout_marginTop="3dp"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:scaleType="matrix"
        android:src="@drawable/blue_line" />
    
    
    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_below="@id/cursor"
        android:layout_marginTop="3dp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
    
    <LinearLayout
        android:id="@+id/linearlayout"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_marginBottom="20dp">
        
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:clickable="true"
            android:padding="15.0dip"
            android:src="@drawable/dot" />
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:clickable="true"
            android:padding="15.0dip"
            android:src="@drawable/dot" />
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:clickable="true"
            android:padding="15.0dip"
            android:src="@drawable/dot" />
        
    </LinearLayout>

</RelativeLayout>

代码：

package com.test.guideactivity;

import java.util.ArrayList;

import android.app.Activity;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
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.util.DisplayMetrics;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity implements OnPageChangeListener {
	private ViewPager viewPager;
	private ViewPagerAdapter adapter;
	private TextView textView1;
	private TextView textView2;
	private TextView textView3;
	//滑动头图片
	private ImageView cursor;
	
	//当前选项卡
	private int currentIndex;
	//偏移量
	private int offset;
	private int bmpW;// 动画图片宽度
	private ArrayList<View> list;
	private ImageView[] dots;
	private LinearLayout linear;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initViews();
		initDot();
		initImage();
	}
	
	
	private void initViews(){
		viewPager = (ViewPager) this.findViewById(R.id.viewpager);
		linear = (LinearLayout) this.findViewById(R.id.linearlayout);
		textView1 = (TextView) this.findViewById(R.id.text1);
		textView2 = (TextView) this.findViewById(R.id.text2);
		textView3 = (TextView) this.findViewById(R.id.text3);
		//设置三个标签的监听事件
		textView1.setOnClickListener(new MyClickListener(0));
		textView2.setOnClickListener(new MyClickListener(1));
		textView3.setOnClickListener(new MyClickListener(2));
		//构造显示的对象
		LayoutInflater inflater = LayoutInflater.from(this);
		list = new ArrayList<View>();
		list.add(inflater.inflate(R.layout.guide1, null));
		list.add(inflater.inflate(R.layout.guide2, null));
		list.add(inflater.inflate(R.layout.guide3, null));
		adapter = new ViewPagerAdapter(list);
		//绑定显示的数据
		viewPager.setAdapter(adapter);
		//设定监听器，当滑动时候进行处理点点的改变
		viewPager.setOnPageChangeListener(this);
	}
	
	private void initDot(){
		if(linear == null){
			Log.e("LinearLayout", "linear == null");
			return;
		}
		dots = new ImageView[list.size()];
		for(int i=0;i<list.size();i++){
			dots[i] = (ImageView) linear.getChildAt(i);
			//首先初始化，全部设为不可用时
			dots[i].setEnabled(false);
		}
		//设置当前第一个可用
		currentIndex = 0;
		dots[currentIndex].setEnabled(true);
	}
	//计算偏移量
	private void initImage(){
		cursor = (ImageView) this.findViewById(R.id.cursor);
		//获取图片的宽度
		bmpW = BitmapFactory.decodeResource(getResources(), R.drawable.blue_line).getWidth();
		DisplayMetrics dm = new DisplayMetrics();
		getWindowManager().getDefaultDisplay().getMetrics(dm);
		int screenW = dm.widthPixels;
		offset = (screenW / 3 - bmpW) / 2;
		Matrix matrix = new Matrix();
		matrix.postTranslate(offset, 0);
		cursor.setImageMatrix(matrix);
	}
	
	//实现OnClickListner接口
	class MyClickListener implements OnClickListener{
		private int index = 0;
		public MyClickListener(int index) {
			this.index = index;
		}
		@Override
		public void onClick(View v) {
			if(viewPager != null){
				viewPager.setCurrentItem(index);
			}
		}
		
	}
	
	/**
	 * ViewPager的构造器，继承PagerAdapter
	 * @author dsw
	 *
	 */
	class ViewPagerAdapter extends PagerAdapter{
		private ArrayList<View> views;
		
		public ViewPagerAdapter(ArrayList<View> views){
			this.views = views;
		}
		
		@Override
		public int getCount() {
			return views == null ? 0 :views.size();
		}

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

		@Override
		public void destroyItem(ViewGroup container, int position, Object object) {
			if(views != null){
				container.removeView(views.get(position));
			}
		}

		@Override
		public Object instantiateItem(ViewGroup container, int position) {
			if(views != null){
				container.addView(views.get(position));
				return views.get(position);
			}
			return super.instantiateItem(container, position);
		}
		
		
	}
	
	
	@Override
	public void onPageScrollStateChanged(int arg0) {
		// 页面状态改变的时候
		Log.v("onPageScrollStateChanged", "arg0:" + arg0);
		
	}


	@Override
	public void onPageScrolled(int arg0, float arg1, int arg2) {
		// 页面滑动的时候
		Log.v("onPageScrolled", "arg0:" + arg0 + "arg1:" + arg1 + "arg2:" + arg2 );
		
	}


	@Override
	public void onPageSelected(int arg0) {
		// 当页面选中的时候
		Log.v("onPageSelected", "arg0:" + arg0);
		if (arg0 < 0 || arg0 > list.size() - 1
				|| currentIndex == arg0)
		{
			return;
		}
		int one = offset * 2 + bmpW;// 页卡1 -> 页卡2 偏移量
		int two = one * 2;			// 页卡1 -> 页卡3 偏移量
		//设置图片的切换,通过平移动画
		Animation anim = null;
		/*  这个方法比较麻烦
		switch(arg0){
		case 0:
			if(currentIndex == 1){
				anim = new TranslateAnimation(one,0,0,0);
			}else if(currentIndex == 2){
				anim = new TranslateAnimation(two, 0, 0, 0);
			}
			break;
		case 1:
			if(currentIndex == 0){
				anim = new TranslateAnimation(offset, one, 0, 0);
			}else if(currentIndex == 2){
				anim = new TranslateAnimation(two, one, 0, 0);
			}
			break;
		 case 2:
			 if (currentIndex == 0) {
				 anim = new TranslateAnimation(offset, two, 0, 0);
			 } else if (currentIndex == 1) {
				 anim = new TranslateAnimation(one, two, 0, 0);
			 }
			  break;
		}
		*/
		anim = new TranslateAnimation(one*currentIndex, one*arg0, 0, 0);
		dots[arg0].setEnabled(true);  //设置选中可用
		dots[currentIndex].setEnabled(false);	//设置上一个不可用
		anim.setFillAfter(true);// True:图片停在动画结束位置
		anim.setDuration(300);
		cursor.startAnimation(anim);
		currentIndex= arg0;
	}
}

源码：点击打开链接