Android studio 实现简易微信程序代码

以下是一个简单的微信程序的代码示例，包含了上述提到的步骤。请注意，这只是一个示例，可能还需要根据具体需求进行修改和完善。

Message.java

public class Message {
    private String content;
    private String sender;
    private String receiver;
    private Date time;

    public Message(String content, String sender, String receiver, Date time) {
        this.content = content;
        this.sender = sender;
        this.receiver = receiver;
        this.time = time;
    }

    public String getContent() {
        return content;
    }

    public String getSender() {
        return sender;
    }

    public String getReceiver() {
        return receiver;
    }

    public Date getTime() {
        return time;
    }
}

MessageAdapter.java

public class MessageAdapter extends RecyclerView.Adapter<MessageAdapter.MessageViewHolder> {
    private List<Message> messageList;

    public MessageAdapter(List<Message> messageList) {
        this.messageList = messageList;
    }

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

    @Override
    public void onBindViewHolder(@NonNull MessageViewHolder holder, int position) {
        Message message = messageList.get(position);
        holder.contentTextView.setText(message.getContent());
        holder.senderTextView.setText(message.getSender());
        holder.timeTextView.setText(message.getTime().toString());
    }

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

    public static class MessageViewHolder extends RecyclerView.ViewHolder {
        public TextView contentTextView;
        public TextView senderTextView;
        public TextView timeTextView;

        public MessageViewHolder(View itemView) {
            super(itemView);
            contentTextView = itemView.findViewById(R.id.contentTextView);
            senderTextView = itemView.findViewById(R.id.senderTextView);
            timeTextView = itemView.findViewById(R.id.timeTextView);
        }
    }
}

ChatManager.java

public class ChatManager {
    private List<Message> messageList;
    private MessageAdapter messageAdapter;

    public ChatManager() {
        messageList = new ArrayList<>();
    }

    public void setAdapter(MessageAdapter adapter) {
        messageAdapter = adapter;
    }

    public void sendMessage(String content, String sender, String receiver) {
        Message message = new Message(content, sender, receiver, new Date());
        messageList.add(message);
        messageAdapter.notifyDataSetChanged();
        // TODO: 发送消息到服务器
    }

    public List<Message> getMessageList() {
        return messageList;
    }

    public void setMessageList(List<Message> messageList) {
        this.messageList = messageList;
        messageAdapter.notifyDataSetChanged();
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {
    private ChatManager chatManager;
    private EditText inputEditText;
    private Button sendButton;
    private RecyclerView messageRecyclerView;
    private MessageAdapter messageAdapter;

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

        inputEditText = findViewById(R.id.inputEditText);
        sendButton = findViewById(R.id.sendButton);
        messageRecyclerView = findViewById(R.id.messageRecyclerView);

        // 初始化 ChatManager，并且设置 RecyclerView 的 Adapter
        chatManager = new ChatManager();
        messageAdapter = new MessageAdapter(chatManager.getMessageList());
        messageRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        messageRecyclerView.setAdapter(messageAdapter);
        chatManager.setAdapter(messageAdapter);

        // 发送消息的按钮点击事件
        sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String content = inputEditText.getText().toString();
                chatManager.sendMessage(content, "me", "you");
                inputEditText.setText("");
            }
        });
    }
}

布局文件 activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

   <androidx.recyclerview.widget.RecyclerView
       android:id="@+id/messageRecyclerView"
       android:layout_width="match_parent"
       android:layout_height="0dp"
       android:layout_weight="1"/>

   <LinearLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="horizontal">

       <EditText
           android:id="@+id/inputEditText"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_weight="1"/>

       <Button
           android:id="@+id/sendButton"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="发送"/>
   </LinearLayout>
</LinearLayout>

布局文件 item_message.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

   <TextView
       android:id="@+id/contentTextView"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:textSize="16sp"/>

   <LinearLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="horizontal">

       <TextView
           android:id="@+id/senderTextView"
           android:layout_width="0dp"
           android:layout_height="wrap_content"
           android:layout_weight="1"
           android:textSize="12sp"/>

       <TextView
           android:id="@+id/timeTextView"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:textSize="12sp"/>
   </LinearLayout>
</LinearLayout>