写一个安卓代码，要求如下：在MsgListActivity中点击任意消息条目跳转到ChatActivity，并将好友姓名传递过来。显示“你正在与”+好友姓名+“聊天\n你发送的消息：”。点击“发送”按钮，将在EditText中输入内容显示在上方TextView上。按下返回键，将最后一条消息内容返回至MsgListActivity，并更新好友姓名对应消息条目中的消息文本内容。

好的，以下是安卓代码的实现：

MsgListActivity.java

public class MsgListActivity extends AppCompatActivity {
    private TextView tvMsg;
    private String friendName;
    private String lastMsg;

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

        tvMsg = findViewById(R.id.tv_msg);
        // 点击任意消息条目跳转到ChatActivity
        tvMsg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MsgListActivity.this, ChatActivity.class);
                intent.putExtra("friendName", friendName);
                startActivityForResult(intent, 1);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK && requestCode == 1) {
            // 获取返回的最后一条消息内容并更新UI
            lastMsg = data.getStringExtra("lastMsg");
            tvMsg.setText(friendName + ": " + lastMsg);
        }
    }

    // 更新好友姓名对应消息条目中的消息文本内容
    public void updateMsg(String name, String msg) {
        friendName = name;
        lastMsg = msg;
        tvMsg.setText(friendName + ": " + lastMsg);
    }
}

ChatActivity.java

public class ChatActivity extends AppCompatActivity {
    private EditText etSendMsg;
    private TextView tvChat;
    private String friendName;

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

        etSendMsg = findViewById(R.id.et_send_msg);
        tvChat = findViewById(R.id.tv_chat);

        // 获取好友姓名
        friendName = getIntent().getStringExtra("friendName");
        setTitle("正在与" + friendName + "聊天");

        // 显示“你发送的消息：”
        etSendMsg.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                if (actionId == EditorInfo.IME_ACTION_SEND) {
                    String msg = v.getText().toString();
                    tvChat.setText("你发送的消息：" + msg);
                    v.setText("");
                    // 返回最后一条消息内容给MsgListActivity
                    Intent intent = new Intent();
                    intent.putExtra("lastMsg", msg);
                    setResult(RESULT_OK, intent);
                    return true;
                }
                return false;
            }
        });
    }

    @Override
    public void onBackPressed() {
        // 返回最后一条消息内容给MsgListActivity
        String msg = tvChat.getText().toString().replace("你发送的消息：", "");
        Intent intent = new Intent();
        intent.putExtra("lastMsg", msg);
        setResult(RESULT_OK, intent);
        super.onBackPressed();
    }
}

activity_msg_list.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/ll_msg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:orientation="vertical"
    android:padding="16dp">

    <TextView
        android:id="@+id/tv_msg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="好友姓名: 最后一条消息"
        android:textSize="18sp" />

</LinearLayout>

activity_chat.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/ll_chat"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

    <TextView
        android:id="@+id/tv_chat"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="18sp" />

    <EditText
        android:id="@+id/et_send_msg"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="输入消息"
        android:imeOptions="actionSend"
        android:inputType="text" />

</LinearLayout>