Android ViewPager FragmentPagerAdapter

ViewPager  里面放Fragment

 <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>

activity_main.xml

 <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>

fragment_chat

 <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>

fragment_call

 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));
     }

 }

ChatFragment.java

 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));
     }

 }

CallFragment.java

 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();
     }
 }

MyFragmentPagerAdapter.java

 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;
         }
     }*/
 }

MainActivity.java