用Android Studio软件编写微信界面代码

以下是一个简单的微信界面代码示例，包括底部导航栏、联系人列表和聊天列表等。

MainActivity.java:

public class MainActivity extends AppCompatActivity {

    private BottomNavigationView bottomNavigationView;
    private FrameLayout fragmentContainer;

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

        bottomNavigationView = findViewById(R.id.bottom_navigation);
        fragmentContainer = findViewById(R.id.fragment_container);

        // 设置底部导航栏的点击事件
        bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId()) {
                    case R.id.tab_chat:
                        showChatFragment();
                        break;
                    case R.id.tab_contact:
                        showContactFragment();
                        break;
                    default:
                        break;
                }
                return true;
            }
        });

        // 默认显示聊天界面
        showChatFragment();
    }

    private void showChatFragment() {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        transaction.replace(R.id.fragment_container, new ChatFragment());
        transaction.commit();
    }

    private void showContactFragment() {
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        transaction.replace(R.id.fragment_container, new ContactFragment());
        transaction.commit();
    }

}

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_above="@+id/bottom_navigation"
        android:layout_alignParentTop="true"
        android:layout_weight="1" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="@android:color/white"
        app:itemIconTint="@color/bottom_navigation_item_color"
        app:itemTextColor="@color/bottom_navigation_item_color"
        app:menu="@menu/menu_bottom_navigation" />

</RelativeLayout>

ChatFragment.java:

public class ChatFragment extends Fragment {

    private RecyclerView recyclerView;
    private List<ChatMessage> chatMessageList;
    private ChatAdapter chatAdapter;

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

        recyclerView = view.findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        chatMessageList = new ArrayList<>();
        chatAdapter = new ChatAdapter(chatMessageList);
        recyclerView.setAdapter(chatAdapter);

        // 添加聊天消息到列表中
        ChatMessage chatMessage = new ChatMessage("Hello, world!", ChatMessage.TYPE_RECEIVED);
        chatMessageList.add(chatMessage);
        chatAdapter.notifyItemInserted(chatMessageList.size() - 1);
        recyclerView.scrollToPosition(chatMessageList.size() - 1);

        return view;
    }

}

fragment_chat.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.recyclerview.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

ContactFragment.java:

public class ContactFragment extends Fragment {

    private EditText searchText;
    private RecyclerView recyclerView;
    private List<Contact> contactList;
    private ContactAdapter contactAdapter;

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

        searchText = view.findViewById(R.id.search_text);
        recyclerView = view.findViewById(R.id.recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        contactList = new ArrayList<>();
        contactAdapter = new ContactAdapter(contactList);
        recyclerView.setAdapter(contactAdapter);

        // 添加联系人到列表中
        Contact contact1 = new Contact("Tom");
        contactList.add(contact1);
        Contact contact2 = new Contact("Jerry");
        contactList.add(contact2);
        contactAdapter.notifyDataSetChanged();

        // 实现搜索功能
        searchText.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                filter(s.toString());
            }

            @Override
            public void afterTextChanged(Editable s) {
            }
        });

        return view;
    }

    private void filter(String text) {
        List<Contact> filteredList = new ArrayList<>();
        for (Contact contact : contactList) {
            if (contact.getName().toLowerCase().contains(text.toLowerCase())) {
                filteredList.add(contact);
            }
        }
        contactAdapter.filterList(filteredList);
    }

}

fragment_contact.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <EditText
        android:id="@+id/search_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Search" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

ChatAdapter.java:

public class ChatAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private List<ChatMessage> chatMessageList;

    public ChatAdapter(List<ChatMessage> chatMessageList) {
        this.chatMessageList = chatMessageList;
    }

    @Override
    public int getItemViewType(int position) {
        return chatMessageList.get(position).getType();
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        if (viewType == ChatMessage.TYPE_RECEIVED) {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_chat_received, parent, false);
            return new ReceivedViewHolder(view);
        } else {
            View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_chat_sent, parent, false);
            return new SentViewHolder(view);
        }
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        ChatMessage chatMessage = chatMessageList.get(position);
        if (holder instanceof ReceivedViewHolder) {
            ((ReceivedViewHolder) holder).messageText.setText(chatMessage.getMessage());
        } else if (holder instanceof SentViewHolder) {
            ((SentViewHolder) holder).messageText.setText(chatMessage.getMessage());
        }
    }

    @Override
    public int getItemCount() {
        return chatMessageList.size();
    }

    public static class ReceivedViewHolder extends RecyclerView.ViewHolder {

        public TextView messageText;

        public ReceivedViewHolder(@NonNull View itemView) {
            super(itemView);
            messageText = itemView.findViewById(R.id.message_text);
        }

    }

    public static class SentViewHolder extends RecyclerView.ViewHolder {

        public TextView messageText;

        public SentViewHolder(@NonNull View itemView) {
            super(itemView);
            messageText = itemView.findViewById(R.id.message_text);
        }

    }

}

item_chat_received.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    android:layout_marginBottom="8dp"
    android:layout_marginStart="24dp"
    android:layout_marginEnd="24dp"
    android:background="@drawable/chat_received_bg"
    android:orientation="vertical"
    android:padding="12dp">

    <TextView
        android:id="@+id/message_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@android:color/white" />

</LinearLayout>

item_chat_sent.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    android:layout_marginBottom="8dp"
    android:layout_marginStart="24dp"
    android:layout_marginEnd="24dp"
    android:background="@drawable/chat_sent_bg"
    android:orientation="vertical"
    android:padding="12dp">

    <TextView
        android:id="@+id/message_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@android:color/white" />

</LinearLayout>

ContactAdapter.java:

public class ContactAdapter extends RecyclerView.Adapter<ContactAdapter.ContactViewHolder> {

    private List<Contact> contactList;
    private List<Contact> filteredList;

    public ContactAdapter(List<Contact> contactList) {
        this.contactList = contactList;
        this.filteredList = new ArrayList<>(contactList);
    }

    @NonNull
    @Override
    public ContactViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_contact, parent, false);
        return new ContactViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ContactViewHolder holder, int position) {
        Contact contact = filteredList.get(position);
        holder.nameText.setText(contact.getName());
    }

    @Override
    public int getItemCount() {
        return filteredList.size();
    }

    public void filterList(List<Contact> filteredList) {
        this.filteredList = filteredList;
        notifyDataSetChanged();
    }

    public static class ContactViewHolder extends RecyclerView.ViewHolder {

        public TextView nameText;

        public ContactViewHolder(@NonNull View itemView) {
            super(itemView);
            nameText = itemView.findViewById(R.id.name_text);
        }

    }

}

item_contact.xml:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/name_text"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="16dp"
    android:textSize="18sp" />

ChatMessage.java:

public class ChatMessage {

    public static final int TYPE_RECEIVED = 0;
    public static final int TYPE_SENT = 1;

    private String message;
    private int type;

    public ChatMessage(String message, int type) {
        this.message = message;
        this.type = type;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public int getType() {
        return type;
    }

    public void setType(int type) {
        this.type = type;
    }

}

Contact.java:

public class Contact {

    private String name;

    public Contact(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

}

注意：以上代码只是一个简单的示例，实际开发中可能需要更多的功能和优化。