android ViewPager左右滑动实现导航栏的背景随页面滑动而滑动

<?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" >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="40.0dip" >

        <ImageView
            android:id="@+id/cursor"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:scaleType="matrix"
            android:src="@drawable/d" />

        <LinearLayout
            android:id="@+id/linearLayout1"
            android:layout_width="fill_parent"
            android:layout_height="40.0dip" >
            <!-- 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="十句话"
                android:textColor="#000000"
                android:textSize="15.0dip" />

            <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="十幅图"
                android:textColor="#000000"
                android:textSize="15.0dip" />

            <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="十糗事"
                android:textColor="#000000"
                android:textSize="15.0dip" />
        </LinearLayout>
    </RelativeLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/vPager"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_gravity="center"
        android:layout_weight="1.0"
        android:background="#000000"
        android:flipInterval="30"
        android:persistentDrawingCache="animation" />

</LinearLayout>

  1 package com.example.viewpagerdemo;
  2 
  3 import java.util.ArrayList;
  4 import java.util.List;
  5 
  6 import android.app.Activity;
  7 import android.graphics.BitmapFactory;
  8 import android.graphics.Matrix;
  9 import android.os.Bundle;
 10 import android.support.v4.view.PagerAdapter;
 11 import android.support.v4.view.ViewPager;
 12 import android.support.v4.view.ViewPager.OnPageChangeListener;
 13 import android.util.DisplayMetrics;
 14 import android.util.Log;
 15 import android.view.LayoutInflater;
 16 import android.view.View;
 17 import android.view.View.OnClickListener;
 18 import android.view.animation.Animation;
 19 import android.view.animation.TranslateAnimation;
 20 import android.view.ViewGroup;
 21 import android.widget.ImageView;
 22 import android.widget.TextView;
 23 import android.widget.Toast;
 24 
 25 public class WeiBoActivity extends Activity {
 26 
 27     private ViewPager viewPager;//页卡内容
 28     private ImageView imageView;// 动画图片
 29     private TextView textView1,textView2,textView3;
 30     private List<View> views;// Tab页面列表
 31     private int offset = 0;// 动画图片偏移量
 32     private int currIndex = 0;// 当前页卡编号
 33     private int bmpW;// 动画图片宽度
 34     private View view1,view2,view3;//各个页卡
 35     @Override
 36     protected void onCreate(Bundle savedInstanceState) {
 37         super.onCreate(savedInstanceState);
 38         setContentView(R.layout.weibo_2);
 39         InitImageView();
 40         InitTextView();
 41         InitViewPager();
 42     }
 43 
 44     private void InitViewPager() {
 45         viewPager=(ViewPager) findViewById(R.id.vPager);
 46         views=new ArrayList<View>();
 47         LayoutInflater inflater=getLayoutInflater();
 48         view1=inflater.inflate(R.layout.lay1, null);
 49         view2=inflater.inflate(R.layout.lay2, null);
 50         view3=inflater.inflate(R.layout.lay3, null);
 51         views.add(view1);
 52         views.add(view2);
 53         views.add(view3);
 54         viewPager.setAdapter(new MyViewPagerAdapter(views));
 55         viewPager.setCurrentItem(0);
 56         viewPager.setOffscreenPageLimit(0);
 57         viewPager.setOnPageChangeListener(new MyOnPageChangeListener());
 58     }
 59      /**
 60       *  初始化头标
 61       */
 62     private void InitTextView() {
 63         textView1 = (TextView) findViewById(R.id.text1);
 64         textView2 = (TextView) findViewById(R.id.text2);
 65         textView3 = (TextView) findViewById(R.id.text3);
 66 
 67         textView1.setOnClickListener(new MyOnClickListener(0));
 68         textView2.setOnClickListener(new MyOnClickListener(1));
 69         textView3.setOnClickListener(new MyOnClickListener(2));
 70     }
 71 
 72     /**
 73      2      * 初始化动画
 74      3 */
 75 
 76     private void InitImageView() {
 77         imageView= (ImageView) findViewById(R.id.cursor);
 78         bmpW = BitmapFactory.decodeResource(getResources(), R.drawable.d).getWidth();// 获取图片宽度
 79         DisplayMetrics dm = new DisplayMetrics();
 80         getWindowManager().getDefaultDisplay().getMetrics(dm);
 81         int screenW = dm.widthPixels;// 获取分辨率宽度
 82         offset = (screenW / 3 - bmpW) / 2;// 计算偏移量
 83         Log.i("AAA", "bmpW "+bmpW);
 84         Log.i("AAA", "screenW "+screenW);
 85         Log.i("AAA", "offset "+offset);
 86     
 87         Matrix matrix = new Matrix();
 88         matrix.postTranslate(offset, 0);
 89         imageView.setImageMatrix(matrix);// 设置动画初始位置
 90     }
 91 
 92     /** 
 93      *     
 94      * 头标点击监听 3 */
 95     private class MyOnClickListener implements OnClickListener{
 96         private int index=0;
 97         public MyOnClickListener(int i){
 98             index=i;
 99         }
100         public void onClick(View v) {
101             viewPager.setCurrentItem(index);            
102         }
103         
104     }
105     
106     public class MyViewPagerAdapter extends PagerAdapter{
107         private List<View> mListViews;
108         
109         public MyViewPagerAdapter(List<View> mListViews) {
110             this.mListViews = mListViews;
111         }
112 
113         @Override
114         public void destroyItem(ViewGroup container, int position, Object object)     {    
115             container.removeView(mListViews.get(position));
116         }
117 
118 
119         @Override
120         public Object instantiateItem(ViewGroup container, int position) {            
121              container.addView(mListViews.get(position), 0);
122              Log.i("AAA", "viewPager 测试  "+position);
123              return mListViews.get(position);
124         }
125 
126         @Override
127         public int getCount() {            
128             return  mListViews.size();
129         }
130         
131         @Override
132         public boolean isViewFromObject(View arg0, Object arg1) {            
133             return arg0==arg1;
134         }
135     }
136 
137     public class MyOnPageChangeListener implements OnPageChangeListener{
138 
139         int one = offset * 2 + bmpW;// 页卡1 -> 页卡2 偏移量
140         int two = one * 2;// 页卡1 -> 页卡3 偏移量
141         
142         
143         public void onPageScrollStateChanged(int arg0) {
144             
145             
146         }
147 
148         public void onPageScrolled(int arg0, float arg1, int arg2) {
149             
150             
151         }
152 
153         public void onPageSelected(int arg0) {
154             /*
155             Animation animation = null;
156             switch (arg0) {
157             case 0:
158                 if (currIndex == 1) {
159                     animation = new TranslateAnimation(one, 0, 0, 0);
160                 } else if (currIndex == 2) {
161                     animation = new TranslateAnimation(two, 0, 0, 0);
162                 }
163                 break;
164             case 1:
165                 if (currIndex == 0) {
166                     animation = new TranslateAnimation(offset, one, 0, 0);
167                 } else if (currIndex == 2) {
168                     animation = new TranslateAnimation(two, one, 0, 0);
169                 }
170                 break;
171             case 2:
172                 if (currIndex == 0) {
173                     animation = new TranslateAnimation(offset, two, 0, 0);
174                 } else if (currIndex == 1) {
175                     animation = new TranslateAnimation(one, two, 0, 0);
176                 }
177                 break;
178             }
179             */
180             
181             Animation animation = new TranslateAnimation(one*currIndex, one*arg0, 0, 0);
182             currIndex = arg0; 
183             animation.setFillAfter(true);// True:图片停在动画结束位置
184             animation.setDuration(300);
185             imageView.startAnimation(animation);
186             Toast.makeText(WeiBoActivity.this, "您选择了"+ viewPager.getCurrentItem()+"页卡", Toast.LENGTH_SHORT).show();
187             
188         }
189     }
190   
191 }