android中viewPager实现的屏幕左右切换(入门篇)

大多数的APP都可以实现几个屏幕来回的切换，

首先新建两个Activity，内容随意，布局随意。接下来在MainActivity.xml：

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

 2     xmlns:tools="http://schemas.android.com/tools"

 3     android:layout_width="match_parent"

 4     android:layout_height="match_parent"

 5     tools:context=".MainActivity" >

 6 

 7     <android.support.v4.view.ViewPager

 8         android:id="@+id/viewpager"

 9         android:layout_width="wrap_content"

10         android:layout_height="wrap_content" >

11     </android.support.v4.view.ViewPager>

12 

13 </RelativeLayou

不要忘记android-support-v4包，目前4.0以上版本都自带

接下来是java中的方法：

 1 protected void onCreate(Bundle savedInstanceState) {

 2         super.onCreate(savedInstanceState);

 3         setContentView(R.layout.activity_main);

 4         viewPager = (ViewPager) findViewById(R.id.viewpager);

 5         View view1 = LayoutInflater.from(MainActivity.this).inflate(R.layout.a,

 6                 null);

 7         View view2 = LayoutInflater.from(MainActivity.this).inflate(R.layout.b,

 8                 null);

 9         list = new ArrayList<View>();

10         list.add(view1);

11         list.add(view2);

12         viewPager.setAdapter(new MyAdapter());

13     }

 1 class MyAdapter extends PagerAdapter {

 2 

 3         @Override

 4         public int getCount() {

 5             return list.size();

 6         }

 7 

 8         @Override

 9         public boolean isViewFromObject(View arg0, Object arg1) {

10             return arg0 == arg1;

11         }

12 

13         @Override

14         public CharSequence getPageTitle(int position) {

15             return titlelist.get(position);

16 

17         }

18 

19         @Override

20         public Object instantiateItem(View container, int position) {

21             ((ViewPager) container).addView(list.get(position));

22             return list.get(position);

23         }

24 

25         @Override

26         public void destroyItem(View container, int position, Object object) {

27             super.destroyItem(container, position, object);

28             ((ViewPager) container).removeView(list.get(position));

29         }

30     }

至此就可以实现两个屏幕的切换