Android ViewPager 예제

Android에서 많이 사용하는 ViewPager의 예제이다. ViewPager를 사용하려면 필수적으로 FragmentActivity를 사용해야하는데, ActionBarActivity를 사용하고 있으면 무시하고 ActionBarActivity를 그대로 사용해도 된다.(FragmentActivity를 상속받고 있기 때문이다.)

public class MainActivity extends ActionBarActivity {
 private ViewPager mViewPager;
 private PagerAdapter mPagerAdapter;
 private class PagerAdapter extends FragmentStatePagerAdapter {
  public PagerAdapter(FragmentManager fm) {
   super(fm);
  }
  @Override
  public Fragment getItem(int position) {
                        // 해당하는 page의 Fragment를 생성합니다.
   return PageFragment.create(position);
  }
  @Override
  public int getCount() {
   return 5;  // 총 5개의 page를 보여줍니다.
  }

 }

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  mViewPager = (ViewPager) findViewById(R.id.pager);
  mPagerAdapter = new PagerAdapter(getSupportFragmentManager());
  mViewPager.setAdapter(mPagerAdapter);
 }
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }
 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  // Handle action bar item clicks here. The action bar will
  // automatically handle clicks on the Home/Up button, so long
  // as you specify a parent activity in AndroidManifest.xml.
  int id = item.getItemId();
  if (id == R.id.action_settings) {
   return true;
  }
  return super.onOptionsItemSelected(item);
 }

public class PageFragment extends Fragment {
 private int mPageNumber;
 public static PageFragment create(int pageNumber) {
  PageFragment fragment = new PageFragment();
  Bundle args = new Bundle();
  args.putInt("page", pageNumber);
  fragment.setArguments(args);
  return fragment;
 }
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  mPageNumber = getArguments().getInt("page");
 }
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState) {
  ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_page, container, false);
  ((TextView) rootView.findViewById(R.id.number)).setText(mPageNumber + "");
  return rootView;
 }
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.viewpagerexample.MainActivity" >
    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
    </android.support.v4.view.ViewPager>
</RelativeLayout>

fragment_page.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <TextView
        android:id="@+id/number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world" />
</RelativeLayout>