使用Android studio写一个记账本，包括xml和Java文件

好的，下面是一个简单的记账本的Android Studio项目，包含XML和Java文件。

XML文件：

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.myapp.MainActivity">

    <TextView
        android:id="@+id/textViewTitle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="My Account Book"
        android:textAlignment="center"
        android:textColor="@color/colorPrimaryDark"
        android:textSize="24sp"
        android:textStyle="bold" />

    <LinearLayout
        android:id="@+id/linearLayoutInput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/textViewTitle"
        android:layout_marginTop="16dp"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/editTextAmount"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="Amount"
            android:inputType="numberDecimal"
            android:textAlignment="center" />

        <EditText
            android:id="@+id/editTextDescription"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:hint="Description"
            android:textAlignment="center" />

        <Button
            android:id="@+id/buttonAdd"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Add" />

    </LinearLayout>

    <ListView
        android:id="@+id/listViewAccounts"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/linearLayoutInput"
        android:layout_marginTop="16dp" />

</RelativeLayout>

Java文件：

MainActivity.java

package com.example.myapp;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;

import java.text.DecimalFormat;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private EditText editTextAmount;
    private EditText editTextDescription;
    private Button buttonAdd;
    private ListView listViewAccounts;
    private TextView textViewTotal;

    private AccountAdapter accountAdapter;

    private ArrayList<Account> accounts = new ArrayList<>();
    private double total = 0;

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

        editTextAmount = findViewById(R.id.editTextAmount);
        editTextDescription = findViewById(R.id.editTextDescription);
        buttonAdd = findViewById(R.id.buttonAdd);
        listViewAccounts = findViewById(R.id.listViewAccounts);
        textViewTotal = findViewById(R.id.textViewTotal);

        accountAdapter = new AccountAdapter(this, accounts);
        listViewAccounts.setAdapter(accountAdapter);

        buttonAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addAccount();
            }
        });
    }

    private void addAccount() {
        String amountString = editTextAmount.getText().toString();
        String description = editTextDescription.getText().toString();

        if (amountString.isEmpty() || description.isEmpty()) {
            return;
        }

        double amount = Double.parseDouble(amountString);
        Account account = new Account(amount, description);
        accounts.add(account);

        total += amount;
        DecimalFormat decimalFormat = new DecimalFormat("#.##");
        textViewTotal.setText("Total: $" + decimalFormat.format(total));

        accountAdapter.notifyDataSetChanged();
        editTextAmount.setText("");
        editTextDescription.setText("");
    }
}

Account.java

package com.example.myapp;

public class Account {
    private double amount;
    private String description;

    public Account(double amount, String description) {
        this.amount = amount;
        this.description = description;
    }

    public double getAmount() {
        return amount;
    }

    public String getDescription() {
        return description;
    }
}

AccountAdapter.java

package com.example.myapp;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import java.text.DecimalFormat;
import java.util.ArrayList;

public class AccountAdapter extends ArrayAdapter<Account> {

    public AccountAdapter(Context context, ArrayList<Account> accounts) {
        super(context, 0, accounts);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Account account = getItem(position);
        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_account, parent, false);
        }
        TextView textViewAmount = convertView.findViewById(R.id.textViewAmount);
        TextView textViewDescription = convertView.findViewById(R.id.textViewDescription);

        DecimalFormat decimalFormat = new DecimalFormat("#.##");
        textViewAmount.setText("$" + decimalFormat.format(account.getAmount()));
        textViewDescription.setText(account.getDescription());

        return convertView;
    }
}

item_account.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="wrap_content"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/textViewAmount"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textColor="@android:color/holo_green_dark"
        android:textSize="18sp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/textViewDescription"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textAlignment="center"
        android:textSize="18sp" />

</LinearLayout>

这个记账本的界面比较简单，用户可以输入金额和描述，然后点击“Add”按钮将数据添加到列表中。每个账户包含金额和描述，并且列表会显示所有添加的账户。在列表的底部，还有一个显示总金额的TextView。