java – 刷新时刷新Android Viewpager片段

有很简单的代码Activity和Fragment：

public class MyActivity extends FragmentActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
        final CustomAdapter adapter = new CustomAdapter(getSupportFragmentManager());
        viewPager.setAdapter(adapter);
    }

    class CustomFragment extends Fragment {

        @Override
        public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
            return inflater.inflate(R.layout.fragment,container,false);
        }

        @Override
        public void onActivityCreated(Bundle savedInstanceState) {
            super.onActivityCreated(savedInstanceState);
            getView().findViewById(R.id.clickMeButton).setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    getView().findViewById(R.id.image).setVisibility(View.VISIBLE);
                }
            });
        }

    }

    class CustomAdapter extends FragmentStatePagerAdapter {

        private List<CustomFragment> fragments = Arrays.asList(
            new CustomFragment(),new CustomFragment(),new CustomFragment()
        );

        public CustomAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int i) {
            return fragments.get(i);
        }

        @Override
        public int getCount() {
            return fragments.size();
        }
    }

}

和适当的xmls：

main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:orientation="vertical"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent">

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

</LinearLayout>

fragment.xml之

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:orientation="vertical"
          android:layout_width="match_parent"
          android:layout_height="match_parent">

    <Button
            android:id="@+id/clickMeButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="click me"/>

    <ImageView
            android:id="@+id/image"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_launcher"
            android:visibility="gone"/>

</LinearLayout>

逻辑很简单.在每个片段上,我可以单击一个按钮,结果会出现一个图像.

它有效.但……

当我在第一个片段上显示图像时,滚动到第三个片段并再次返回到第一个片段,图像消失了.

我该怎么做才能防止这种情况发生？我应该以某种方式保存可见度吗？