<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/container"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >     <RelativeLayout        android:id="@+id/topBar"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:background="@drawable/bg_topbar" >         <ImageButton            android:id="@+id/back"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignParentLeft="true"            android:layout_centerVertical="true"            android:src="@drawable/back" />         <ImageButton            android:id="@+id/mark"            android:layout_width="28dp"            android:layout_height="28dp"            android:layout_alignParentRight="true"            android:layout_centerVertical="true"            android:layout_marginRight="10dp"            android:background="@drawable/mark" />         <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerInParent="true"            android:text="@string/app_name"            android:textColor="#ffffffff"            android:textSize="18sp" />    </RelativeLayout>     <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:background="#ffeeeeee" >         <TextView            android:id="@+id/tvTag1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:gravity="center"            android:text="首页"            android:textColor="#ff000000"            android:textSize="20sp" />         <TextView            android:id="@+id/tvTag2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:gravity="center"            android:text="商品"            android:textColor="#ff000000"            android:textSize="20sp" />         <TextView            android:id="@+id/tvTag3"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:gravity="center"            android:text="评论"            android:textColor="#ff000000"            android:textSize="20sp" />    </LinearLayout>     <ImageView        android:id="@+id/ivCursor"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:scaleType="matrix"        android:src="@drawable/cursor" />     <android.support.v4.view.ViewPager        android:id="@+id/vpViewPager1"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        >    </android.support.v4.view.ViewPager> </LinearLayout> 

 public class MainActivity extends Activity implements OnClickListener {     private ViewPager vpViewPager = null;    private List<View> views = null;     private int offset; // 间隔    private int cursorWidth; // 游标的长度    private int originalIndex = 0;    private ImageView cursor = null;    private ImageButton mark = null;    private ImageButton back = null;    private Animation animation = null;    private boolean IsMark=false;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        requestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.activity_main);         ((ImageButton) findViewById(R.id.back)).setOnClickListener(this);        ((ImageButton) findViewById(R.id.mark)).setOnClickListener(this);         mark = (ImageButton) findViewById(R.id.mark);        back = (ImageButton) findViewById(R.id.back);         ((TextView) findViewById(R.id.tvTag1)).setOnClickListener(this);        ((TextView) findViewById(R.id.tvTag2)).setOnClickListener(this);        ((TextView) findViewById(R.id.tvTag3)).setOnClickListener(this);         views = new ArrayList<View>();        views.add(LayoutInflater.from(this).inflate(R.layout.index_fragment,                null));        views.add(LayoutInflater.from(this).inflate(R.layout.goods_fragment,                null));        views.add(LayoutInflater.from(this).inflate(R.layout.comment_fragment,                null));         vpViewPager = (ViewPager) findViewById(R.id.vpViewPager1);         vpViewPager.setAdapter(new MyPagerAdapter(views));        vpViewPager.setOnPageChangeListener(new MyOnPageChangeListener());         initCursor(views.size());         MyPagerAdapter myPagerAdapter = (MyPagerAdapter) vpViewPager                .getAdapter();        View v1 = myPagerAdapter.getItemAtPosition(0);        View v2 = myPagerAdapter.getItemAtPosition(1);        View v3 = myPagerAdapter.getItemAtPosition(2);       @Override    public void onClick(View v) {        switch (v.getId()) {        case R.id.tvTag1:            vpViewPager.setCurrentItem(0);            break;        case R.id.tvTag2:            vpViewPager.setCurrentItem(1);            break;        case R.id.tvTag3:            vpViewPager.setCurrentItem(2);            break;        case R.id.back:            break;         case R.id.mark:            if(IsMark==false){            mark.setImageResource(R.drawable.mark_success);            Toast.makeText(this, "收藏成功", 0).show();            IsMark=true;            }            break;        }    }     /**     * 根据tag的数量初始化游标的位置     *      * @param tagNum     */    public void initCursor(int tagNum) {        cursorWidth = BitmapFactory.decodeResource(getResources(),                R.drawable.cursor).getWidth();        DisplayMetrics dm = new DisplayMetrics();        getWindowManager().getDefaultDisplay().getMetrics(dm);        offset = ((dm.widthPixels / tagNum) - cursorWidth) / 2;         cursor = (ImageView) findViewById(R.id.ivCursor);        Matrix matrix = new Matrix();        matrix.setTranslate(offset, 0);        cursor.setImageMatrix(matrix);    }     class MyOnPageChangeListener implements OnPageChangeListener {        @Override        public void onPageSelected(int arg0) {            int one = 2 * offset + cursorWidth;            int two = one * 2;             switch (originalIndex) {            case 0:                if (arg0 == 1) {                    animation = new TranslateAnimation(0, one, 0, 0);                }                if (arg0 == 2) {                    animation = new TranslateAnimation(0, two, 0, 0);                }                break;            case 1:                if (arg0 == 0) {                    animation = new TranslateAnimation(one, 0, 0, 0);                }                if (arg0 == 2) {                    animation = new TranslateAnimation(one, two, 0, 0);                }                break;            case 2:                if (arg0 == 1) {                    animation = new TranslateAnimation(two, one, 0, 0);                }                if (arg0 == 0) {                    animation = new TranslateAnimation(two, 0, 0, 0);                }                break;            }            animation.setFillAfter(true);            animation.setDuration(300);            cursor.startAnimation(animation);             originalIndex = arg0;        }         @Override        public void onPageScrolled(int arg0, float arg1, int arg2) {         }         @Override        public void onPageScrollStateChanged(int arg0) {         }     } }

public class MyPagerAdapter extends PagerAdapter {     private List<View> views;     public MyPagerAdapter(List<View> views) {        this.views = views;    }     @Override    public int getCount() {        return views.size();    }     @Override    public boolean isViewFromObject(View arg0, Object arg1) {        return arg0 == arg1;    }     @Override    public void destroyItem(View container, int position, Object object) {        // 将指定的view从viewPager中移除        ((ViewPager) container).removeView(views.get(position));    }     @Override    public Object instantiateItem(View container, int position) {        // 将view添加到viewPager中        ((ViewPager) container).addView(views.get(position));        return views.get(position);    }     public View getItemAtPosition(int position) {        return views.get(position);    } }