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>

<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;
        }
    }*/
}