样例：
1 主要的Activity 实现
/**
* ViewPager 的使用
*/
public class ViewPagerActivity extends Activity {
private ViewPager mPager;
private List<View> listViews;
private ImageView cursor;
private TextView t1, t2, t3;
private int offset = 0;//移动条图片的偏移量
private int currIndex = 0;//当前页面的编号
private int bmpWidth;// 移动条图片的长度
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_pager);
initCursorPos();
initView();
}
//完成View组件的初始化,并将三个view动态地添加到Adapter对象中
//然后调用setAdapter将view集合与ViewPager绑定,设置进去的页面
//指向第一个页面setCurrentItem(0),最后设置onclick和onPageChange监听器
public void initView()
{
mPager = (ViewPager) findViewById(R.id.vPager);
t1 = (TextView) findViewById(R.id.text1);
t2 = (TextView) findViewById(R.id.text2);
t3 = (TextView) findViewById(R.id.text3);
listViews = new ArrayList<View>();
LayoutInflater mInflater = getLayoutInflater();
listViews.add(mInflater.inflate(R.layout.activity_view_pager2, null));
listViews.add(mInflater.inflate(R.layout.activity_view_pager3, null));
listViews.add(mInflater.inflate(R.layout.activity_view_pager4, null));
mPager.setAdapter(new MyPageAdapter(listViews));
mPager.setCurrentItem(0);
t1.setOnClickListener(new MyClickListener(0));
t2.setOnClickListener(new MyClickListener(1));
t3.setOnClickListener(new MyClickListener(2));
mPager.setOnPageChangeListener(new MyOnPageChangeListener());
}
//初始化指示器的位置,就是下面那个移动条一开始放的地方
public void initCursorPos() {
cursor = (ImageView) findViewById(R.id.cursor);
bmpWidth = BitmapFactory.decodeResource(getResources(), R.drawable.gdt)
.getWidth();// 获取图片宽度
DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int screenW = dm.widthPixels;// 获取分辨率宽度
offset = (screenW / 3 - bmpWidth) / 2;// 计算偏移量
Matrix matrix = new Matrix();
matrix.postTranslate(offset, 0);
cursor.setImageMatrix(matrix);// 设置动画初始位置
}
//设置点击事件,点击上面文字切换页面的
public class MyClickListener implements OnClickListener
{
private int index = 0;
public MyClickListener(int i)
{
index = i;
}
@Override
public void onClick(View arg0) {
mPager.setCurrentItem(index);
}
}
//监听页面切换时间,主要做的是动画处理,就是移动条的移动
public class MyOnPageChangeListener implements OnPageChangeListener {
int one = offset * 2 + bmpWidth;// 移动一页的偏移量,比如1->2,或者2->3 (这个数值等于一个导航条的宽度)
int two = one * 2;// 移动两页的偏移量,比如1直接跳3
@Override
public void onPageSelected(int index) {
Animation animation = null;
//index为当前选择的是哪个页面
switch (index) {
case 0:
if (currIndex == 1) {
animation = new TranslateAnimation(one, 0, 0, 0);
} else if (currIndex == 2) {
animation = new TranslateAnimation(two, 0, 0, 0);
}
break;
case 1:
if (currIndex == 0) {
animation = new TranslateAnimation(offset, one, 0, 0);
} else if (currIndex == 2) {
animation = new TranslateAnimation(two, one, 0, 0);
}
break;
case 2:
if (currIndex == 0) {
animation = new TranslateAnimation(offset, two, 0, 0);
} else if (currIndex == 1) {
animation = new TranslateAnimation(one, two, 0, 0);
}
break;
}
currIndex = index;
animation.setFillAfter(true);// true表示图片停在动画结束位置
animation.setDuration(300); //设置动画时间为300毫秒
cursor.startAnimation(animation);//开始动画
}
@Override
public void onPageScrollStateChanged(int arg0) {}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {}
}
}
2 PagerAdapter 类
public class MyPageAdapter extends PagerAdapter {
private List<View> viewLists;
public MyPageAdapter() {}
public MyPageAdapter(List<View> viewLists)
{
super();
this.viewLists = viewLists;
}
//获得viewpager中有多少个view
@Override
public int getCount() {
return viewLists.size();
}
/**
* 通常这么写就可以了
*/
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
/**
* ①将给定位置的view添加到ViewGroup(容器)中,创建并显示出来
* ②返回一个代表新增页面的Object(key),通常都是直接返回view本身就可以了,
*/
@Override
public Object instantiateItem(ViewGroup container, int position) {
container.addView(viewLists.get(position));
return viewLists.get(position);
}
//移除一个给定位置的页面。
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(viewLists.get(position));
}
}
3 xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="60dp"
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="红色" />
<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="蓝色"/>
<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="黄色" />
</LinearLayout>
<ImageView
android:id="@+id/cursor"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scaleType="matrix"
android:src="@drawable/gdt" />
<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:flipInterval="30"
android:persistentDrawingCache="animation" />
</LinearLayout>
4 每一个pager中的4个xml都差不多一样，只贴一个
<?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"
android:gravity="center"
android:background="#FF6666">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="第一个Page"
/>
</LinearLayout>