Viewpager+fragment implementation of Android in the screen left and right switch (Advanced article)

Fragment supports the use of different activity and can handle its own input events and life cycle methods. Can be seen as a child activity.

First look at the layout:

1 <LinearLayoutxmlns: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=". Viewpageractivity " >6 7     <Android.support.v4.view.ViewPager8         Android:id= "@+id/viewpager"9 Android:layout_width= "Wrap_content"Ten Android:layout_height= "Wrap_content" One android:layout_gravity= "Center" > A     </Android.support.v4.view.ViewPager> -  - </LinearLayout>

Main file: viewpageractivity inheritance Fragmentactivity

1  PackageCom.example.viewpagerdemo;2 3 Importjava.util.ArrayList;4 Importjava.util.List;5 6 ImportAndroid.os.Bundle;7 Importandroid.support.v4.app.Fragment;8 Importandroid.support.v4.app.FragmentActivity;9 ImportAndroid.support.v4.view.ViewPager;Ten  One ImportCom.example.adapter.fragmentAdapter; A  -  Public classViewpageractivityextendsfragmentactivity { -  the @Override -     protected voidonCreate (Bundle savedinstancestate) { -         Super. OnCreate (savedinstancestate); - Setcontentview (R.layout.activity_view_pager); +list<fragment> fragments =NewArraylist<fragment>(); -          for(inti = 0; I < 3; i++) { +Fragment f =Newbuttonfragment (); A Fragments.add (f); at         } -Viewpager VP =(Viewpager) Findviewbyid (R.id.viewpager); -Fragmentadapter FA =NewFragmentadapter (Getsupportfragmentmanager (), - fragments); - Vp.setadapter (FA); -Vp.setcurrentitem (0); in     } -}

New Fragmentadapter inheritance Fragmentpageradapter does not write the implementation method

1  PackageCom.example.adapter;2 3 Importjava.util.List;4 5 Importandroid.support.v4.app.Fragment;6 ImportAndroid.support.v4.app.FragmentManager;7 ImportAndroid.support.v4.app.FragmentPagerAdapter;8 9  Public classFragmentadapterextendsFragmentpageradapter {Ten     PrivateList<fragment>fragments; One     PrivateFragmentmanager FM; A  -      PublicFragmentadapter (Fragmentmanager FM, list<fragment>fragments) { -         Super(FM); the          This. Fragments =fragments; -  -     } -  +      PublicFragmentadapter (fragmentmanager FM) { -         Super(FM); +          This. FM =FM; A     } at  - @Override -      PublicFragment GetItem (intarg0) { -         returnFragments.get (arg0); -     } -  in @Override -      Public intGetCount () { to         returnfragments.size (); +     } -  the}

Define the fragment content to be displayed, and place a button in it

1  PackageCom.example.viewpagerdemo;2 3 ImportAndroid.os.Bundle;4 Importandroid.support.v4.app.Fragment;5 ImportAndroid.view.LayoutInflater;6 ImportAndroid.view.View;7 ImportAndroid.view.ViewGroup;8 ImportAndroid.widget.TextView;9 Ten  Public classButtonfragmentextendsFragment { One     PrivateView Rootview;
12 - @Override -      PublicView Oncreateview (layoutinflater inflater, ViewGroup container, the Bundle savedinstancestate) { -Rootview = Inflater.inflate (R.layout.guide1, container,false); -         returnRootview;18    }19}

The implementation of 3 contains a button can be switched left and right

Viewpager+fragment implementation of Android in the screen left and right switch (Advanced article)