写了个记账的单机软件，数据记录使用的是SQLite，现在遇到的问题是加入数据一直失败。

进入软件的顺序是FirstActivity -------从set进入menu的点击第一个选项触发跳转-----》AddAccount

数据库

DatabaseHelper.java

package com.example.managemoney.database;

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

public class DatabaseHelper extends SQLiteOpenHelper {
    static int dbVersion=1;
    static String name="data.db";

    public DatabaseHelper(Context context){
        super(context,name,null,dbVersion);
    }

    public void onUpgrade(SQLiteDatabase db, int a, int b){

    }

    //创建的时候使用一次
    public void onCreate(SQLiteDatabase db){
        String sql_01="create table write(id integer primary key autoincrement,"+
                "MintCheng varchar(5),"+
                "JingE float,"+
                "GuiZhang varchar(5),"+
                "BeiZhu varchar(100)," +
                "Time   varchar(30),"+
                "Year  integer,"+
                "Month  integer,"+
                "Day  integer,"+
                "Hour  integer,"+
                "Minutes  integer,"+
                "Seconds  integer)";

        String sql_00="create table account(id integer primary key autoincrement,"+
                "Account_MingCheng varchar(10) ,"+
                "JingE float)";

        db.execSQL(sql_00);
        db.execSQL(sql_01);


    }
}

DatabaseManager.java

package com.example.managemoney.database;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.widget.ArrayAdapter;
import android.widget.CursorAdapter;

import com.example.managemoney.Stct_Account;

import java.util.ConcurrentModificationException;

public class DatabaseManage {
    private static DatabaseHelper helper;
    private static int t=0;
    //初始化数据库对象
    public  static void initDB(Context context){
            //帮助类对象
            helper=new DatabaseHelper(context);

            //数据库对象


    }

    //读取数据库中的数据写入内存中
    public static Cursor Read_Db(){
        // 第一个参数String：表名
        // 第二个参数String[]:要查询的列名
        // 第三个参数String：查询条件
        // 第四个参数String[]：查询条件的参数
        // 第五个参数String:对查询的结果进行分组
        // 第六个参数String：对分组的结果进行限制
        // 第七个参数String：对查询的结果进行排序
        SQLiteDatabase db=helper.getReadableDatabase();
        Cursor cursor=db.query("account",new String[]{"Account_MintCheng","JingE float"},
                null,null,null,null,null);
        cursor.moveToFirst();
        db.close();
        return cursor;

    }


    //记账后更新表account
    public static void update_account(Stct_Account sa){
        SQLiteDatabase db=helper.getWritableDatabase();
        ContentValues ct=new ContentValues();
        ct.put("Account_MingCheng",sa.getMingCheng_01());
        ct.put("JingE",sa.getJingE_01());
        db.insert("account",null,ct);
        db.close();

    }

    //将记账的数据写入表write
    public void insert_write(ContentValues ct){
        SQLiteDatabase db=helper.getWritableDatabase();
        db.insert("write",null,ct);
        db.close();
    }

    //插入数据到账户表中
    public void InsertToTable_Write( ContentValues ct){
        SQLiteDatabase db=helper.getWritableDatabase();
        t=1;
        //向账户表中插入数据
        db.insert("account",null,ct);
        db.close();
    }

    //查找账户是否存在
    public static boolean FindAccount(String str){
        SQLiteDatabase db=helper.getReadableDatabase();
        if(t==0)return false;
        Cursor cursor=db.rawQuery("Select count(*) from account;", null);
        db.close();
        int a=cursor.getCount();
        if(a<=0)return false;
        while(a>0){
            if(cursor.getString(cursor.getColumnIndexOrThrow("Account_MingCheng")).equals(str)){
                return true;
            }
            if(cursor.isLast()){
                return false;
            }
        }

        return false;
    }


}

Firstactivity.java

public class FirstActivity extends AppCompatActivity {

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.first_layout);
    DatabaseManage.initDB(getApplicationContext());

    //初始化listview



    //初始化listview，绑定适配器
    ListView listView_01=findViewById(R.id.ListView_01);
    List<Stct_Account> list=getdata();
    ArrayAdapter<Stct_Account>adapter=new ArrayAdapter<Stct_Account>(FirstActivity.this,
                    R.layout.listview_textview,list);
    listView_01.setAdapter(adapter);


//set组件

    ImageButton imb_set = findViewById(R.id.set);
    imb_set.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            showPopupMenu(imb_set);

        }
    });
//set组件的菜单栏
    private void showPopupMenu(View view){
        //view当前popupmenu显示的相对view的位置
        PopupMenu popupMenu = new PopupMenu(this, view);
        //menu的布局
        popupMenu.getMenuInflater().inflate(R.menu.main, popupMenu.getMenu());
        //menu的item点击事件
        popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem menuItem) {

                switch(menuItem.getItemId()){
                    case R.id.menu_add_account:
                        Intent intent_01 = new Intent(FirstActivity.this, AddAccount.class);
                        ;
                        startActivity(intent_01);

                        break;
                    case R.id.menu_change_account:
                        Intent intent_02 = new Intent(FirstActivity.this, ChangeAccount.class);
                        ;
                        startActivity(intent_02);
                        break;
                    case R.id.menu_delete_account:
                        Intent intent_03 = new Intent(FirstActivity.this, DeleteAccount.class);
                        ;
                        startActivity(intent_03);
                        break;
                }

                //添加账户

                //修改账户

                //删除账户



                return false;
            }
        });


        popupMenu.show();

        //Popupmenu的关闭事件


    }

    public List<Stct_Account> getdata(){
        //获得数据
        List<Stct_Account> data=new ArrayList<Stct_Account>();
        Cursor cursor=DatabaseManage.Read_Db();
        if (cursor != null && cursor.getCount() >= 1) {
            while (cursor.moveToNext()) {
                Stct_Account sa=new Stct_Account();
                sa.insertMingCheng_01(cursor.getString(cursor.getColumnIndexOrThrow("MingCheng")));
                sa.insertJingE_01(cursor.getFloat(cursor.getColumnIndexOrThrow("JingE")));
                data.add(sa);

            }

        }
        cursor.close();
        return data;
    }

}

addaccount.java

package com.example.managemoney;

import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.text.InputType;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.example.managemoney.database.DatabaseManage;

public class AddAccount extends AppCompatActivity {
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.add_account);


        Button button=findViewById(R.id.aabt_01);
        button.setOnClickListener(new View.OnClickListener(){
            public void onClick(View view){
                EditText ET_AAc=findViewById(R.id.aaet_01),
                        ET_AJe=findViewById(R.id.aaet_02);

                ET_AJe.setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL);

                String Str_AAc=ET_AAc.getText().toString();



                if(Str_AAc.isEmpty()|ET_AJe.getText().toString().isEmpty())
                {
                    Toast.makeText(AddAccount.this,"请检查填写信息是否有缺失",Toast.LENGTH_SHORT).show();
                }
                else
                {
                    float F_Je=Float.valueOf(ET_AJe.getText().toString());
                    //将添加的账户信息插入到数据库中
                    Stct_Account stct_account=new Stct_Account();
                    stct_account.insertJingE_01(F_Je);
                    stct_account.insertMingCheng_01(Str_AAc);
                    DatabaseManage.update_account(stct_account);
                    //已有此账户名称，无法添加
                    if(DatabaseManage.FindAccount(Str_AAc)) {
                        Toast.makeText(AddAccount.this, "已有此名称账户，无法再次添加！", Toast.LENGTH_SHORT).show();
                    }
                    //
                    else {
                        boolean a=DatabaseManage.FindAccount(Str_AAc);
                        if(a)Toast.makeText(AddAccount.this,"111111",Toast.LENGTH_SHORT).show();
                        else Toast.makeText(AddAccount.this,"00000",Toast.LENGTH_SHORT).show();

                        Intent intent = new Intent(AddAccount.this,FirstActivity.class);;
                        startActivity(intent);
                        Toast.makeText(AddAccount.this, "添加成功！", Toast.LENGTH_SHORT).show();
                    }
                }


            }

        });

    }

}