<span role="heading" aria-level="2">家庭记账本安卓版开发：第三天</span>

一、成果

点击添加账目

选择账目类型

点击输入日期

点击确定，输入其它信息

点击添加

这里以为第一次没截图到上面的添加成功

查看数据库

添加成功

二、经验总结

首先，今天原本打算将添加与查询全部账目的部分，但是在开发过程中遇到了一些问题，关于变量的类型，如date，是否设为Date类型，但Date类型无法强转为String类型，最终在layout布局文件里设置了inputType=date解决了问题；还有下拉框组件的点击事件，原本使用的是setOnClickListener，实际应该要用mTypeSpin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() 。

再就是关于选择日期，弹出日历组件，参考了下面的博客

https://blog.csdn.net/qq_40116418/article/details/84784593

三、部分原码

AddBillActivity.java

package com.example.familybook;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;

import androidx.annotation.Nullable;

import com.example.familybook.dao.BillDaoImpl;
import com.example.familybook.dao.IBillDao;
import com.example.familybook.entity.Bill;

import java.sql.Date;
import java.util.Calendar;


public class AddBillActivity extends Activity {
    private int mYear;
    private int mMonth;
    private int mDay;
    private Spinner  mTypeSpin;
    private EditText mMoney;
    private EditText mDate;
    private EditText mRemark;
    private Button mAddBillBtn;
    private IBillDao mIBillDao;
    private String mTypeText;
    private String mUsername;
    private String TAG="AddBillActivity";

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

        //

        //获取登录者的用户名
        Intent intent =getIntent();
        mUsername =intent.getStringExtra("username");
        Log.e(TAG,"使用者："+mUsername);

        //获取时间
        initDate();

        //初始化控件
        initView();

        //添加监听事件
        initListener();
    }

    private void initDate() {
        //获取当前时间
        Calendar ca = Calendar.getInstance();
        mYear = ca.get(Calendar.YEAR);
        mMonth = ca.get(Calendar.MONTH);
        mDay = ca.get(Calendar.DAY_OF_MONTH);
    }

    private void initListener() {
        
        mTypeSpin.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                mTypeText=parent.getItemAtPosition(position).toString();
                Toast.makeText(AddBillActivity.this,mTypeText,Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
        mDate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //调用时间选择器
                DatePickerDialog datePickerDialog = new DatePickerDialog(AddBillActivity.this, R.style.MyDatePickerDialogTheme, onDateSetListener, mYear, mMonth, mDay);
                //获取时间戳
                long timeStamp = System.currentTimeMillis();
                //设置可以显示的最晚的时间
                datePickerDialog.getDatePicker().setMaxDate(timeStamp);
                //弹框
                datePickerDialog.show();
            }
        });
        mAddBillBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addBill();
            }
        });
    }

    /**
     * 日期选择器对话监听
     */
    private DatePickerDialog.OnDateSetListener onDateSetListener = new DatePickerDialog.OnDateSetListener() {

        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
            mYear = year;
            mMonth = monthOfYear;
            mDay = dayOfMonth;

            String days;
            if (mMonth + 1 < 10) {
                if (mDay < 10) {
                    days = new StringBuffer().append(mYear).append("-").append("0").
                            append(mMonth + 1).append("-").append("0").append(mDay).append("").toString();
                } else {
                    days = new StringBuffer().append(mYear).append("-").append("0").
                            append(mMonth + 1).append("-").append(mDay).append("").toString();
                }

            } else {
                if (mDay < 10) {
                    days = new StringBuffer().append(mYear).append("-").
                            append(mMonth + 1).append("-").append("0").append(mDay).append("").toString();
                } else {
                    days = new StringBuffer().append(mYear).append("-").
                            append(mMonth + 1).append("-").append(mDay).append("").toString();
                }

            }

            mDate.setText(days);
        }
    };
    private void addBill() {
        Bill bill=null;
        //获取账目类型
        if(mTypeText==null){
            //说明用户未点击按钮，选择默认首项：饮食
            mTypeText="饮食";
        }
        //获取账目金额
        String moneyText=mMoney.getText().toString().trim();
        //获取日期
        String  date= mDate.getText().toString().trim();
        //获取备注
        String remarkText=mRemark.getText().toString().trim();
        if(TextUtils.isEmpty(moneyText)){
            //账目金额为空
            Toast.makeText(this,"账目金额不可以为空",Toast.LENGTH_SHORT).show();
            return;
        }else if(TextUtils.isEmpty((CharSequence) date)){
            //账目日期为空
            Toast.makeText(this,"账目日期不可以为空",Toast.LENGTH_SHORT).show();
            return;
        }else {
            Log.e(TAG, "账户：" + mUsername);
            Log.e(TAG, "类型：" + mTypeText);
            Log.e(TAG, "金额：" + moneyText);
            Log.e(TAG, "日期：" + date);
            Log.e(TAG, "备注：" + remarkText);
            bill=new Bill(mUsername,mTypeText,moneyText,date,remarkText);
            int rs=(int)mIBillDao.AddBill(bill);
            Log.e(TAG,"rs："+rs);
            if (rs > -1) {
                //添加成功，跳回首面
                Intent intent = new Intent();
                setResult(2, intent);
                finish();
            }
        }
    }

    private void initView() {
        mTypeSpin =(Spinner) this.findViewById(R.id.type_spin);
        mMoney =(EditText)this.findViewById(R.id.bill_money);
        mDate =(EditText)this.findViewById(R.id.bill_date);
        mRemark=(EditText)this.findViewById(R.id.bill_remark);
        mAddBillBtn=(Button)this.findViewById(R.id.add_bill_btn);
        mIBillDao  =new BillDaoImpl(AddBillActivity.this);
    }
}

Bill.java

package com.example.familybook.entity;

import java.sql.Date;

/**
 * 账单实体类
 */
public class Bill {
    private int  _id;
    private String username;
    private String type;
    private String money;
    private String date;
    private String remark;

    public Bill() {
    }

    public Bill(int _id, String username, String type, String money, String date, String remark) {
        this._id = _id;
        this.username = username;
        this.type = type;
        this.money = money;
        this.date = date;
        this.remark = remark;
    }

    public Bill(String username, String type, String money, String date, String remark) {
        this.username = username;
        this.type = type;
        this.money = money;
        this.date = date;
        this.remark = remark;
    }


    public int get_id() {
        return _id;
    }

    public void set_id(int _id) {
        this._id = _id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getType() {
        return type;
    }

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

    public String getMoney() {
        return money;
    }

    public void setMoney(String money) {
        this.money = money;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    @Override
    public String toString() {
        return "Bill{" +
                "_id=" + _id +
                ", username='" + username + '\'' +
                ", type='" + type + '\'' +
                ", money=" + money +
                ", date=" + date +
                ", remark='" + remark + '\'' +
                '}';
    }
}

BillDaoImpl.java

package com.example.familybook.dao;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import com.example.familybook.database.FamilyBookDatabaseHelper;
import com.example.familybook.entity.Bill;
import com.example.familybook.utils.Constants;

import java.util.ArrayList;
import java.util.List;

public class BillDaoImpl implements IBillDao {
    private  final FamilyBookDatabaseHelper mBillDatabaseHelper;

    public BillDaoImpl(Context context){
        mBillDatabaseHelper=new FamilyBookDatabaseHelper(context);
    }

    /**
     * 添加账目
     * @param bill
     * @return
     */
    @Override
    public long AddBill(Bill bill) {
        SQLiteDatabase db =mBillDatabaseHelper.getWritableDatabase();
        long result =-1;
        try {
            ContentValues values  =new ContentValues();
            values.put(Constants.BILL_TABLE_FIELD_UNAME,bill.getUsername());
            values.put(Constants.BILL_TABLE_FIELD_TYPE,bill.getType());
            values.put(Constants.BILL_TABLE_FIELD_MONEY,bill.getMoney());
            values.put(Constants.BILL_TABLE_FIELD_DATE,bill.getDate());
            values.put(Constants.BILL_TABLE_FIELD_REMARK,bill.getRemark());
            result=db.insert(Constants.BILL_TABLE_NAME,null,values);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            db.close();
        }

        return result;
    }

   
}

activity_addbill.xml

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

    <TextView
        android:layout_width="wrap_content"
        android:text="添加账目"
        android:textSize="50sp"
        android:layout_gravity="center"
        android:layout_height="wrap_content"/>
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_marginTop="40dp"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="82dp"
            android:text="请选择账目类型"
            android:textSize="20sp" />

        <Spinner
            android:id="@+id/type_spin"
            android:entries="@array/bill_type"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:scrollbarSize="25sp"
            android:layout_alignParentRight="true"
            android:layout_marginRight="60dp" />
    </RelativeLayout>

    <EditText
        android:id="@+id/bill_money"
        android:layout_marginTop="20dp"
        android:layout_width="250dp"
        android:hint="请输入账目金额"
        android:inputType="number"
        android:layout_gravity="center"
        android:layout_height="wrap_content"/>
    <EditText
        android:id="@+id/bill_date"
        android:layout_marginTop="20dp"
        android:layout_width="250dp"
        android:hint="请输入账目日期"
        android:inputType="date"
        android:layout_gravity="center"
        android:layout_height="wrap_content"/>
    <EditText
        android:id="@+id/bill_remark"
        android:layout_width="250dp"
        android:layout_marginTop="20dp"
        android:layout_gravity="center"
        android:hint="在此处添加备注"
        android:layout_height="wrap_content"/>
    <Button
        android:id="@+id/add_bill_btn"
        android:layout_width="wrap_content"
        android:layout_marginTop="20dp"
        android:background="@android:color/transparent"
        android:text="添加"
        android:layout_gravity="center"
        android:layout_height="wrap_content"/>
</LinearLayout>