ViewPager使用方法及子View的获取
【摘要】
public class ViewPager_2Activity extends Activity{ private List<View> listViews; private ViewPager viewPager; /** Called when the activity is first created. */ @...
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public class ViewPager_2Activity extends Activity
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{
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private List<View> listViews;
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private ViewPager viewPager;
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/** Called when the activity is first created. */
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@Override
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public void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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listViews = new ArrayList<View>();
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listViews.add(View.inflate(getApplicationContext(), R.layout.layout1,
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null));
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listViews.add(View.inflate(getApplicationContext(), R.layout.layout2,
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null));
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listViews.add(View.inflate(getApplicationContext(), R.layout.layout3,
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null));
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viewPager = (ViewPager) findViewById(R.id.v_Pager);
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viewPager.setAdapter(new MyPagerAdapter(listViews));
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viewPager.setCurrentItem(0);
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View view = listViews.get(2);
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TextView textView = (TextView) view.findViewById(R.id.text_3);
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textView.setText("10");
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Button button = (Button) view.findViewById(R.id.button_3);
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button.setOnClickListener(new OnClickListener()
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{
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public void onClick(View v)
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{
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// TODO Auto-generated method stub
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Toast.makeText(getApplicationContext(), "你点击了按钮",
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Toast.LENGTH_SHORT).show();
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}
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});
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}
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private class MyPagerAdapter extends PagerAdapter
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{
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private List<View> mListView;
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private MyPagerAdapter(List<View> list)
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{
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// TODO Auto-generated method stub
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this.mListView = list;
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}
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@Override
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/**这个方法，是从ViewGroup中移出当前View**/
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public void destroyItem(View container, int position, Object object)
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{
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// TODO Auto-generated method stub
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((ViewGroup) container ).removeView(mListView.get(position));
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}
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@Override
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public void finishUpdate(View view)
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{
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// TODO Auto-generated method stub
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}
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@Override
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/**这个方法，是获取当前窗体界面数**/
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public int getCount()
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{
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// TODO Auto-generated method stub
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return mListView.size();
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}
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@Override
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/**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**/
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public Object instantiateItem(View container, int position)
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{
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// TODO Auto-generated method stub
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((ViewGroup) container).addView(mListView.get(position), 0);
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return mListView.get(position);
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}
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@Override
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/**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**/
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public boolean isViewFromObject(View view, Object object)
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{
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// TODO Auto-generated method stub
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return view == (object);
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}
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@Override
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public void restoreState(Parcelable state, ClassLoader loader)
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{
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// TODO Auto-generated method stub
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}
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@Override
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public Parcelable saveState()
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{
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// TODO Auto-generated method stub
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return null;
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}
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@Override
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public void startUpdate(View v)
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{
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// TODO Auto-generated method stub
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}
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}
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}
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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android:orientation="vertical" >
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<android.support.v4.view.ViewPager
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android:id="@+id/v_Pager"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent" >
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</android.support.v4.view.ViewPager>
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</LinearLayout>
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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android:orientation="vertical" >
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<TextView android:id="@+id/text_1"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="15"
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android:textSize="150sp"
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android:layout_gravity="center_horizontal"/>
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<Button
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android:id="@+id/button_1"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:text="第1页面"
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android:textSize="30sp"
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></Button>
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</LinearLayout>
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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android:orientation="vertical" >
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<TextView android:id="@+id/text_2"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="25"
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android:textSize="150sp"
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android:layout_gravity="center_horizontal"/>
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<Button
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android:id="@+id/button_2"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:text="第2页面"
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android:textSize="30sp"
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></Button>
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</LinearLayout>
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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android:orientation="vertical" >
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<TextView android:id="@+id/text_3"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:text="35"
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android:textSize="150sp"
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android:layout_gravity="center_horizontal"/>
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<Button
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android:id="@+id/button_3"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:text="第3页面"
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android:textSize="30sp"
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></Button>
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</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
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@Override
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public void onPageSelected(int arg0)
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{
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// TODO Auto-generated method stub
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System.out.println("onPageSelected = " + arg0);
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if (arg0 == 0)
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mViewPaper.setCurrentItem(arg0 + 1);
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else if (arg0 == mViewList.size() - 1)
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mViewPaper.setCurrentItem(arg0 - 1);
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}
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onPageSelected(int arg0){
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}
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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。
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public void onPageScrollStateChanged(int arg0) {
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// TODO Auto-generated method stub
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} 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。
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public void onPageScrolled(int arg0, float arg1, int arg2) {
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// TODO Auto-generated method stub
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}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。
文章来源: panda1234lee.blog.csdn.net，作者：panda1234lee，版权归原作者所有，如需转载，请联系作者。
原文链接：panda1234lee.blog.csdn.net/article/details/8747811
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