android 界面滑動切換

package com.jxc.fragment;

import java.util.ArrayList;
import java.util.List;
import com.jxc.homeandschool.R;
import android.os.Bundle;
import android.app.Fragment;
import android.content.res.Resources;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.PagerTitleStrip;
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.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.TextView;

public class Fragment1 extends Fragment {
 private ViewPager viewPager;
 // private PagerTitleStrip pagerTitleStrip;
 private MyAdapter adapter = null;
 private List<View> list = null;

    private TextView tvTabActivity, tvTabGroups, tvTabFriends;
    private View view;

    private ImageView ivBottomLine;
    private int currIndex = 0;
    private int bottomLineWidth;
    private int offset = 0;
    private int position_one;
    private int position_two;
    private int position_three;
    private Resources resources;
   

 // private List<String> title = null;

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState) {
  view = inflater.inflate(R.layout.fragment1, null);
  resources = getResources();
  InitWidth();
  InitTextView();
  viewPager = (ViewPager) view.findViewById(R.id.ViewPager);
  // pagerTitleStrip=(PagerTitleStrip)
  // container.findViewById(R.id.PagerTitleStip);
  //
  // pagerTitleStrip.setTextSize(2, 25);
  // pagerTitleStrip.setTextColor(Color.RED);
  // pagerTitleStrip.setBackgroundColor(R.drawable.menu_title);

  adapter = new MyAdapter();

  // 第一次被加載的佈局對象
  View tab1 = inflater.inflate(R.layout.tab1, null);
  View tab2 = inflater.inflate(R.layout.tab2, null);
  View tab3 = inflater.inflate(R.layout.tab3, null);
  // View tab1=LayoutInflater.from(Fragment1.this).inflate(R.layout.tab,
  // null);
  // View tab2=LayoutInflater.from(Fragment1.this).inflate(R.layout.tab1,
  // null);
  // View tab3=LayoutInflater.from(Fragment1.this).inflate(R.layout.tab3,
  // null);

  list = new ArrayList<View>();
  list.add(tab1);
  list.add(tab2);
  list.add(tab3);

  // title=new ArrayList<String>();
  // title.add("學校");
  // title.add("班級");
  // title.add("成績");

  // 先初始化頁面
  viewPager.setAdapter(adapter);

  viewPager.setCurrentItem(0);
  viewPager.setOnPageChangeListener(new MyOnPageChangeListener());
  
  return view;
 }

 private void InitWidth() {
  ivBottomLine = (ImageView) view.findViewById(R.id.iv_bottom_line);
        bottomLineWidth = ivBottomLine.getLayoutParams().width;
        DisplayMetrics dm = new DisplayMetrics();
//        getWindowManager().getDefaultDisplay().getMetrics(dm);
        getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);
        int screenW = dm.widthPixels;
        offset = (int) ((screenW / 3.0 - bottomLineWidth) / 2);
//        Log.i("MainActivity", "offset=" + offset);

        position_one = (int) (screenW / 3.0);
        position_two = position_one * 2;
        position_three = position_one * 3;
 }

 private void InitTextView() {
  tvTabActivity = (TextView) view.findViewById(R.id.tv_tab_activity);
  tvTabGroups = (TextView) view.findViewById(R.id.tv_tab_groups);
  tvTabFriends = (TextView) view.findViewById(R.id.tv_tab_friends);

  tvTabActivity.setOnClickListener(new MyOnClickListener(0));
  tvTabGroups.setOnClickListener(new MyOnClickListener(1));
  tvTabFriends.setOnClickListener(new MyOnClickListener(2));
 }

  public class MyOnClickListener implements View.OnClickListener {
         private int index = 0;

         public MyOnClickListener(int i) {
             index = i;
         }

         @Override
         public void onClick(View v) {
             viewPager.setCurrentItem(index);
         }
     };
    
     public class MyOnPageChangeListener implements OnPageChangeListener {

         @Override
         public void onPageSelected(int arg0) {
             Animation animation = null;
             switch (arg0) {
             case 0:
                 if (currIndex == 1) {
                     animation = new TranslateAnimation(position_one, 0, 0, 0);
                     tvTabGroups.setTextColor(resources.getColor(R.color.lightwhite));
                 } else if (currIndex == 2) {
                     animation = new TranslateAnimation(position_two, 0, 0, 0);
                     tvTabFriends.setTextColor(resources.getColor(R.color.lightwhite));
                 }
                 tvTabActivity.setTextColor(resources.getColor(R.color.white));
                 break;
             case 1:
                 if (currIndex == 0) {
                     animation = new TranslateAnimation(0, position_one, 0, 0);
                     tvTabActivity.setTextColor(resources.getColor(R.color.lightwhite));
                 } else if (currIndex == 2) {
                     animation = new TranslateAnimation(position_two, position_one, 0, 0);
                     tvTabFriends.setTextColor(resources.getColor(R.color.lightwhite));
                 }
                 tvTabGroups.setTextColor(resources.getColor(R.color.white));
                 break;
             case 2:
                 if (currIndex == 0) {
                     animation = new TranslateAnimation(0, position_two, 0, 0);
                     tvTabActivity.setTextColor(resources.getColor(R.color.lightwhite));
                 } else if (currIndex == 1) {
                     animation = new TranslateAnimation(position_one, position_two, 0, 0);
                     tvTabGroups.setTextColor(resources.getColor(R.color.lightwhite));
//                 } else if (currIndex == 3) {
//                     animation = new TranslateAnimation(position_three, position_two, 0, 0);
//                     tvTabChat.setTextColor(resources.getColor(R.color.lightwhite));
                 }
                 tvTabFriends.setTextColor(resources.getColor(R.color.white));
                 break;
             }
             currIndex = arg0;
             animation.setFillAfter(true);
             animation.setDuration(300);
             ivBottomLine.startAnimation(animation);
         }

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

         @Override
         public void onPageScrollStateChanged(int arg0) {
         }
     }
    
 class MyAdapter extends PagerAdapter {

  @Override
  public Object instantiateItem(ViewGroup container, int position) {
   // TODO Auto-generated method stub
   ((ViewPager) container).addView(list.get(position));
   return list.get(position);
  }

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

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

<?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:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="47dp"
        android:background="@drawable/top_theme_blue"
        android:orientation="vertical" >

        <LinearLayout
            android:id="@+id/linearLayout1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingBottom="5dip"
            android:paddingTop="10dip" >

            <TextView
                android:id="@+id/tv_tab_activity"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1.0"
                android:gravity="center"
                android:text="@string/tab_1"
                android:textColor="@color/white"
                android:textSize="18sp" />

            <TextView
                android:id="@+id/tv_tab_groups"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1.0"
                android:gravity="center"
                android:text="@string/tab_2"
                android:textColor="@color/lightwhite"
                android:textSize="18sp" />

            <TextView
                android:id="@+id/tv_tab_friends"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1.0"
                android:gravity="center"
                android:text="@string/tab_3"
                android:textColor="@color/lightwhite"
                android:textSize="18sp" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:orientation="vertical"
            android:paddingBottom="3dip" >

            <ImageView
                android:id="@+id/iv_bottom_line"
                android:layout_width="40dip"
                android:layout_height="2dip"
                android:layout_marginLeft="34dip"
                android:scaleType="matrix"
                android:src="#fff" />
        </LinearLayout>
    </LinearLayout>

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

</LinearLayout>