3.7每日总结

所花时间：7h

代码量：600

博客量：1

了解的知识点：

    记事本

package com.example.myapplication;

 

import android.annotation.SuppressLint;

import android.content.Intent;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.ImageButton;

import android.widget.ListView;

 

import androidx.annotation.Nullable;

import androidx.appcompat.app.AppCompatActivity;

 

import com.example.myapplication.DBhelper;

import com.example.myapplication.costList;

 

import java.util.ArrayList;

import java.util.List;

public class MainActivity extends AppCompatActivity implements ListAdapter.OnItemClickListener {

 

    private DBhelper helper;

    private  ListView listView;

    private  ImageButton Add;

    private  ImageButton search;

    private List<costList>list;

 

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        initView();

        initData();

    }

    //初始化

    @SuppressLint("Range")

    private void initData() {

        helper=new DBhelper(MainActivity.this);

        list=new ArrayList<>();

        SQLiteDatabase db=helper.getReadableDatabase();

        Cursor cursor=db.query("account",null,null,null,null,

                null,null);

        while (cursor.moveToNext()){

            costList clist=new costList();//构造实例

            clist.set_id(cursor.getInt(cursor.getColumnIndex("_id")));

            clist.setTitle(cursor.getString(cursor.getColumnIndex("Title")));

            clist.setDate(cursor.getString(cursor.getColumnIndex("Date")));

            clist.setMoney(cursor.getString(cursor.getColumnIndex("Money")));

            list.add(clist);

        }

        listView = findViewById(R.id.list_view);

        //绑定适配器

        ListAdapter mAdapter = new ListAdapter(this,list);

        mAdapter.setOnItemClickListener(this);

        listView.setAdapter(mAdapter);

        db.close();

    }

   /* @Override

    public void onItemClick(int position) {

        // 处理点击事件的逻辑

        Log.d("Main", "jump");

        costList item = list.get(position);

        Intent intent = new Intent(MainActivity.this, upgrade_cost.class);

        intent.putExtra("item_id", item.get_id());

        startActivityForResult(intent, 1);

    }

*/

    private void initView() {

        Add=findViewById(R.id.add);

        search=findViewById(R.id.search);

    }

 

 

 

    //事件：添加

    public void addAccount(View view){//跳转

        Intent intent=new Intent(MainActivity.this,new_cost.class);

        startActivityForResult(intent,1);

    }

    /*public void searchAccount(View view){

        Intent intent=new Intent(MainActivity.this,search_cost.class);

        startActivityForResult(intent,2);

    }*/

 

    /*@Override

    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {

        super.onActivityResult(requestCode, resultCode, data);

        if(requestCode==1&&resultCode==1)

        {

            this.initData();

        }

        if(requestCode==2&&resultCode==2){

            // 获取选择的日期数据

            String selectedDate = null;

            if (data != null) {

                selectedDate = data.getStringExtra("selected_date");

                // 根据选择的日期从数据库中检索相关账单数据并显示在主界面上

                showBillsForSelectedDate(selectedDate);

            }

        }

    }*/

 

    /*private void showBillsForSelectedDate(String selectedDate) {

        // 根据选择的日期从数据库中检索相关账单数据

        List<costList> billList = helper.getBillsForDate(selectedDate); // 假设 DBHelper 中有一个方法可以根据日期检索相关账单数据

 

        // 使用适配器将账单数据绑定到 ListView 上

        ListAdapter adapter = new ListAdapter(this, billList);

        listView.setAdapter(adapter);

    }*/

 

    public void refresh(View view) {

        initView();

        initData();

    }

 

    @Override

    public void onItemClick(int position) {

 

    }

}