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

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

     android:id="@+id/activity_main"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     tools:context="com.example.lesson10_viewpager_fragmentpageradapter.MainActivity">

     <android.support.v4.view.ViewPager

         android:id="@+id/vp"

         android:layout_width="match_parent"

         android:layout_height="wrap_content">

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

 </RelativeLayout>

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

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     android:orientation="vertical">

     <LinearLayout

         android:id="@+id/ll"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:layout_alignParentBottom="true"

         android:orientation="horizontal">

         <EditText

             android:layout_width="0dp"

             android:layout_height="wrap_content"

             android:layout_weight="1"

             android:hint="请输入聊天消息" />

         <Button

             android:layout_width="wrap_content"

             android:layout_height="wrap_content"

             android:text="send" />

     </LinearLayout>

     <ListView

         android:id="@+id/lv_chat"

         android:layout_width="match_parent"

         android:layout_height="match_parent"

         android:layout_above="@id/ll" />

 </RelativeLayout>

 <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:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:background="@android:color/holo_blue_dark"

         android:padding="10dp"

         android:gravity="center"

         android:textSize="18sp"

         android:textColor="@android:color/white"

         android:text="电话列表"/>

     <ListView

         android:id="@+id/lv_call"

         android:layout_width="match_parent"

         android:layout_height="match_parent"/>

 </LinearLayout>

 public class ChatFragment extends Fragment {

     //设置假数据

     List<String> mList = new ArrayList<>();

     ListView lv_chat;

     @Override

     public void onCreate(@Nullable Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         for (int i = 0; i <50 ; i++) {

             mList.add("邹:"+i);

         }

     }

     @Nullable

     @Override

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

         View layout = inflater.inflate(R.layout.chat_layout,null);

         return layout;

     }

     @Override

     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {

         super.onViewCreated(view, savedInstanceState);

         lv_chat = (ListView) view.findViewById(R.id.lv_chat);

         lv_chat.setAdapter(new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,mList));

     }

 }

 public class CallFragment extends Fragment {

     //设置假数据

     List<String> mList = new ArrayList<>();

     ListView lv_call;

     @Override

     public void onCreate(@Nullable Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         for (int i = 0; i <100 ; i++) {

             mList.add("电话号码"+i);

         }

     }

     @Nullable

     @Override

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

         View layout = inflater.inflate(R.layout.call_layout,null);

         return layout;

     }

     @Override

     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {

         super.onViewCreated(view, savedInstanceState);

         lv_call = (ListView) view.findViewById(R.id.lv_call);

         lv_call.setAdapter(new ArrayAdapter<String>(getActivity(),android.R.layout.simple_list_item_1,mList));

     }

 }

 public class MyFragmentPagerAdapter extends FragmentPagerAdapter{

     //适配器需要数据，这里是两页Fragment

     List<Fragment> mList;

     public MyFragmentPagerAdapter(FragmentManager fm, List<Fragment> mList) {

         super(fm);

         this.mList = mList;

     }

     @Override

     public Fragment getItem(int position) {

         return mList.get(position);

     }

     @Override

     public int getCount() {

         return mList.size();

     }

 }

 public class MainActivity extends AppCompatActivity {

     List<Fragment> mList = new ArrayList<>();

     ViewPager vp;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         mList.add(new ChatFragment());

         mList.add(new CallFragment());

         vp = (ViewPager) findViewById(R.id.vp);

         FragmentManager fm = getSupportFragmentManager();

         vp.setAdapter(new MyFragmentPagerAdapter(fm,mList));

     }

     //必须使用类的方法创建

     //因为FragmentPagerAdapter构造方法需要一个FragmentManager，下面这种方式，管理器拿不到

     //成员对象在onCreate()方法之前就加载了

    /* private FragmentPagerAdapter adapter = new FragmentPagerAdapter(fm) {

         @Override

         public Fragment getItem(int position) {

             return null;

         }

         @Override

         public int getCount() {

             return 0;

         }

     }*/

 }