ViewPager使用方法及子View的获取

public class ViewPager_2Activity extends Activity
{
	private List<View> listViews;
	private ViewPager viewPager;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		listViews = new ArrayList<View>();
		listViews.add(View.inflate(getApplicationContext(), R.layout.layout1,
				null));
		listViews.add(View.inflate(getApplicationContext(), R.layout.layout2,
				null));
		listViews.add(View.inflate(getApplicationContext(), R.layout.layout3,
				null));

		viewPager = (ViewPager) findViewById(R.id.v_Pager);
		viewPager.setAdapter(new MyPagerAdapter(listViews));
		viewPager.setCurrentItem(0);
		
	
		View view = listViews.get(2);
		TextView textView = (TextView) view.findViewById(R.id.text_3);
		textView.setText("10");
		Button button = (Button) view.findViewById(R.id.button_3);
		button.setOnClickListener(new OnClickListener()
		{

			public void onClick(View v)
			{
				// TODO Auto-generated method stub
				Toast.makeText(getApplicationContext(), "你点击了按钮",
						Toast.LENGTH_SHORT).show();
			}
		});
	}

	private class MyPagerAdapter extends PagerAdapter
	{

		private List<View> mListView;

		private MyPagerAdapter(List<View> list)
		{
			// TODO Auto-generated method stub
			this.mListView = list;
		}

		@Override
		/**这个方法，是从ViewGroup中移出当前View**/
		public void destroyItem(View container, int position, Object object)
		{
			// TODO Auto-generated method stub
			((ViewGroup) container ).removeView(mListView.get(position));
		}

		@Override
		public void finishUpdate(View view)
		{
			// TODO Auto-generated method stub

		}

		@Override
		/**这个方法，是获取当前窗体界面数**/
		public int getCount()
		{
			// TODO Auto-generated method stub
			return mListView.size();
		}

		@Override
		 /**这个方法，return一个对象，这个对象表明了PagerAdapter适配器选择哪个对象*放在当前的ViewPager中**/
		public Object instantiateItem(View container, int position)
		{
			// TODO Auto-generated method stub
			((ViewGroup) container).addView(mListView.get(position), 0);
			return mListView.get(position);
		}

		@Override
		/**这个方法，在帮助文档中原文是could be implemented as return view == object,*也就是用于判断是否由对象生成界面**/
		public boolean isViewFromObject(View view, Object object)
		{
			// TODO Auto-generated method stub
			return view == (object);
		}

		@Override
		public void restoreState(Parcelable state, ClassLoader loader)
		{
			// TODO Auto-generated method stub

		}

		@Override
		public Parcelable saveState()
		{
			// TODO Auto-generated method stub
			return null;
		}

		@Override
		public void startUpdate(View v)
		{
			// TODO Auto-generated method stub

		}

	}
}

main.xml代码

<?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" >

    <android.support.v4.view.ViewPager
        android:id="@+id/v_Pager"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    </android.support.v4.view.ViewPager>

</LinearLayout>

其余三个布局：layout_1.xml，layout_2.xml，layout_3.xml

<?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" >
    <TextView  android:id="@+id/text_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="15"
        android:textSize="150sp"
        android:layout_gravity="center_horizontal"/>
    <Button
        android:id="@+id/button_1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="第1页面"
        android:textSize="30sp"
        ></Button>

</LinearLayout>

<?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" >
    <TextView  android:id="@+id/text_2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="25"
        android:textSize="150sp"
        android:layout_gravity="center_horizontal"/>
    <Button
        android:id="@+id/button_2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="第2页面"
        android:textSize="30sp"
        ></Button>

</LinearLayout>

<?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" >
    <TextView  android:id="@+id/text_3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="35"
        android:textSize="150sp"
        android:layout_gravity="center_horizontal"/>
    <Button
        android:id="@+id/button_3"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="第3页面"
        android:textSize="30sp"
        ></Button>

</LinearLayout>

效果图：



ViewPager页面拖动到最前或最后的时候回弹效果

看到一哥们用ViewPager写的左右滑动的屏幕，像UC浏览器那样，连接：
http://www.eoeandroid.com/thread-92508-1-1.html
但是当滑到最左端或者最右端就不能滑动了，感觉用户体验不如UC的，所以就试着弄了下

继承ViewPager类以后，在左面和右面各增加个空View，然后在onPageSelected方法中

@Override
		public void onPageSelected(int arg0)
		{
			// TODO Auto-generated method stub
			System.out.println("onPageSelected = " + arg0);
			if (arg0 == 0)
				mViewPaper.setCurrentItem(arg0 + 1);
			else if (arg0 == mViewList.size() - 1)
				mViewPaper.setCurrentItem(arg0 - 1);
		}

ViewPager的onPageChangeListener里面的一些方法参数：

onPageSelected(int arg0){

}

arg0是表示你当前选中的页面，这事件是在你页面跳转完毕的时候调用的。

public void onPageScrollStateChanged(int arg0) {
    // TODO Auto-generated method stub
    
    
   } arg0 ==1的时候表示正在滑动，arg0==2的时候表示滑动完毕了，arg0==0的时候表示什么都没做，就是停在那。

 

public void onPageScrolled(int arg0, float arg1, int arg2) {
    // TODO Auto-generated method stub
    
   }表示在前一个页面滑动到后一个页面的时候，在前一个页面滑动前调用的方法。