framelayout内部的viewpager

Question

public class MainActivity extends FragmentActivity {

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

        FragmentManager FM = getSupportFragmentManager();
        FragmentTransaction FT = FM.beginTransaction();

        Fragment_ViewPager f_pager = new Fragment_ViewPager();
        FT.add(R.id.fragment_container, f_pager);
        FT.commit();

    }
}

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_container"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

</FrameLayout>

fragment_viewpager.java

private static final int[] ICONS = new int[] { R.drawable.ic_launcher,  R.drawable.ic_launcher,  R.drawable.ic_launcher };
    private FragmentPagerAdapter mFragmentPagerAdapter;
    private ViewPager mViewPager;
    private TabPageIndicator mTabPagerIndicator;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View v = inflater.inflate(R.layout.f_pager, container, false);

        mFragmentPagerAdapter = new Adapter_ViewPager(getActivity().getSupportFragmentManager(), ICONS);
        mViewPager = (ViewPager)v.findViewById(R.id.view_pager_inicio);
        mViewPager.setAdapter(mFragmentPagerAdapter);
        mTabPagerIndicator = (TabPageIndicator)v.findViewById(R.id.tab_indicator_inicio);
        mTabPagerIndicator.setViewPager(mViewPager);


        return v;

    }

fragment_viewpager.xml

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


    <com.viewpagerindicator.TabPageIndicator
        android:id="@+id/tab_indicator_inicio"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        />

        <android.support.v4.view.ViewPager
        android:id="@+id/view_pager_inicio"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        />

</LinearLayout>

adapter_viewpager.java

private static int[] ICONS = null;
    private Fragment mFragment = null;

    public Ad_inicio(FragmentManager fm,  int[] icons) {
        super(fm);
        ICONS = icons;
    }

    @Override
    public Fragment getItem(int position) {
        switch (position) {
        case 0:
            mFragment = new Fragmento_uno();
            break;
        case 1:
            mFragment = new Fragmento_dos();
            break;
        case 2:
            mFragment = new Fragmento_tres();
            break;
        default:
            break;
        }
        return mFragment;
    }



    @Override
    public int getIconResId(int index) {
        return ICONS[index];
    }

    @Override
    public int getCount() {
        return ICONS.length;
    }

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View v = inflater.inflate(R.layout.fragmento_One, container, false);

        return v;

    }

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

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="uno" />

</LinearLayout>

Answer 1

对于adapter_viewpager类，除了默认的构造函数(FragmentManager)之外，不要使用其他构造函数！

我认为，当您的活动重新启动时，Android调用默认构造函数，图标将为空。

试着在那里放一个断点，看看循环后图标的值是多少。