家庭记账本第三次开发

package com.example.jizhangben;

import android.app.Activity;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;

import androidx.annotation.Nullable;

public class addcost extends Activity implements View.OnClickListener  {


    private EditText title_et;
    private EditText money_et;
    private DatePicker date_dp;
    private Button tijiao_btn;
    private Button back_btn;
    private CostDB costDB;
    private SQLiteDatabase dbwriter;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.addcost);
        title_et=(EditText)findViewById(R.id.et_title);
        money_et=(EditText)findViewById(R.id.et_money);
        date_dp=(DatePicker)findViewById(R.id.dp_data);
        tijiao_btn=(Button)findViewById(R.id.bt_tijiao);
        back_btn=(Button)findViewById(R.id.bt_back);
        tijiao_btn.setOnClickListener(this);
        back_btn.setOnClickListener(this);
        costDB =new CostDB(this);
        dbwriter = costDB.getWritableDatabase();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.bt_tijiao:
                costBean costBean1=new costBean();
                costBean1.costTitle=title_et.getText().toString();
                costBean1.costMoney=money_et.getText().toString();
                costBean1.costDate=date_dp.getYear()+"-"+(date_dp.getMonth()+1)+"-"+date_dp.getDayOfMonth();
                costDB.insertCost(costBean1);
                finish();
                break;
            case R.id.bt_back:
                finish();
                break;
        }
    }
}