用Android Studio编写微信五个界面代码、

这里提供一个简单的示例代码，实现微信五个界面的切换和基本功能：

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private ViewPager viewPager;
    private TabLayout tabLayout;
    private List<Fragment> fragmentList;

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

        viewPager = findViewById(R.id.view_pager);
        tabLayout = findViewById(R.id.tab_layout);

        fragmentList = new ArrayList<>();
        fragmentList.add(new WeChatFragment());
        fragmentList.add(new ContactsFragment());
        fragmentList.add(new DiscoverFragment());
        fragmentList.add(new MeFragment());
        fragmentList.add(new AddFriendFragment());

        FragmentPagerAdapter adapter = new FragmentPagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return fragmentList.get(position);
            }

            @Override
            public int getCount() {
                return fragmentList.size();
            }

            @Override
            public CharSequence getPageTitle(int position) {
                switch (position) {
                    case 0:
                        return "微信";
                    case 1:
                        return "通讯录";
                    case 2:
                        return "发现";
                    case 3:
                        return "我";
                    case 4:
                        return "添加朋友";
                    default:
                        return "";
                }
            }
        };

        viewPager.setAdapter(adapter);
        tabLayout.setupWithViewPager(viewPager);
    }
}

WeChatFragment.java

public class WeChatFragment extends Fragment {

    private RecyclerView recyclerView;
    private List<ChatItem> chatItemList;
    private ChatListAdapter chatListAdapter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_we_chat, container, false);

        recyclerView = view.findViewById(R.id.recycler_view);

        chatItemList = new ArrayList<>();
        chatItemList.add(new ChatItem("张三", "你好啊", "14:20", 1));
        chatItemList.add(new ChatItem("李四", "在干嘛呢", "12:30", 2));
        chatItemList.add(new ChatItem("王五", "今天天气真好", "11:20", 0));
        chatItemList.add(new ChatItem("赵六", "明天去哪里玩啊", "10:10", 3));
        chatItemList.add(new ChatItem("小明", "你吃饭了吗？", "09:20", 0));
        chatItemList.add(new ChatItem("小红", "听说你要搬家了", "08:30", 0));
        chatItemList.add(new ChatItem("小李", "你喜欢看电影吗", "07:40", 0));
        chatItemList.add(new ChatItem("小刚", "周末有空吗", "06:50", 0));
        chatItemList.add(new ChatItem("小美", "我刚买了一件新衣服", "05:30", 0));
        chatItemList.add(new ChatItem("小丽", "你看了最新的电视剧吗", "04:20", 0));

        chatListAdapter = new ChatListAdapter(getActivity(), chatItemList);
        recyclerView.setAdapter(chatListAdapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        return view;
    }
}

ContactsFragment.java

public class ContactsFragment extends Fragment {

    private ListView listView;
    private List<ContactItem> contactItemList;
    private ContactListAdapter contactListAdapter;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_contacts, container, false);

        listView = view.findViewById(R.id.list_view);

        contactItemList = new ArrayList<>();
        contactItemList.add(new ContactItem("张三", "13812345678"));
        contactItemList.add(new ContactItem("李四", "13912345678"));
        contactItemList.add(new ContactItem("王五", "13612345678"));
        contactItemList.add(new ContactItem("赵六", "13712345678"));
        contactItemList.add(new ContactItem("小明", "13512345678"));
        contactItemList.add(new ContactItem("小红", "13412345678"));
        contactItemList.add(new ContactItem("小李", "13312345678"));
        contactItemList.add(new ContactItem("小刚", "13212345678"));
        contactItemList.add(new ContactItem("小美", "13112345678"));
        contactItemList.add(new ContactItem("小丽", "13012345678"));

        contactListAdapter = new ContactListAdapter(getActivity(), contactItemList);
        listView.setAdapter(contactListAdapter);

        return view;
    }
}

DiscoverFragment.java

public class DiscoverFragment extends Fragment {

    private Button btnScan;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_discover, container, false);

        btnScan = view.findViewById(R.id.btn_scan);
        btnScan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getActivity(), "扫一扫", Toast.LENGTH_SHORT).show();
            }
        });

        return view;
    }
}

MeFragment.java

public class MeFragment extends Fragment {

    private TextView tvName;
    private TextView tvAccount;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_me, container, false);

        tvName = view.findViewById(R.id.tv_name);
        tvAccount = view.findViewById(R.id.tv_account);

        tvName.setText("张三");
        tvAccount.setText("123456789");

        return view;
    }
}

AddFriendFragment.java

public class AddFriendFragment extends Fragment {

    private EditText etName;
    private Button btnSearch;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_add_friend, container, false);

        etName = view.findViewById(R.id.et_name);
        btnSearch = view.findViewById(R.id.btn_search);
        btnSearch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = etName.getText().toString();
                Toast.makeText(getActivity(), "搜索：" + name, Toast.LENGTH_SHORT).show();
            }
        });

        return view;
    }
}

以上是实现微信五个界面的示例代码，具体实现过程中还需要根据实际需求进行相应的调整和优化。