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SQLite Datenbank in Kotlin - App stürtzt immer ab
#1
Hey,

ich bin neu in Java bzw. Kotlin und Co.
dabei bin ich bei einem Übungsprojekt auf ein Problem gestoßen was ich selbst nicht lösen kann. Ich habe "gegoogelt" wie ein irrer und finde den Fehler nicht.


Zu meiner App:
Es ist eine simple Einkaufsliste. Auf der MainActivity soll eine Liste mit den Einkäufen angezeigt werden die ein der NewActivity erzeugt werden.
Die Daten sollen einzeln und alle zusammen gelöscht werden können.

später sollen vielleicht noch einzelne Einkaufzettel erstellt werden können also Kategorien oder so.



Das Problem:
Aus irgend einem Problem, Stürzt die App schon beim Start ab, ohne eine Fehlermeldung aus zu geben.
Der Fehler ist irgendwo im SQLite-Code aber ich hab keine Ahnung was ich falsch mache.
ich hoffe ihr könnt mir weiterhelfen.

Die Projekt Dateien: http://uploaded.net/file/y4r4gdgm

MainActivity:


Code:
package com.example.einkaufsliste

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*


class MainActivity : AppCompatActivity() {


   override fun onCreate(savedInstanceState: Bundle?) {
       super.onCreate(savedInstanceState)
       setContentView(R.layout.activity_main)

       // Ausgabe der Tabelle
       TableHelper(this).alleEintraege()


       // Button Neu (btn_New)
       btn_new.setOnClickListener {
           val btnNew = Intent(this, NewActivity::class.java)
           startActivity(btnNew)
       }

   }

   override fun onCreateOptionsMenu(menu: Menu): Boolean {
       val inflater = menuInflater
       inflater.inflate(R.menu.main_menu, menu)
       return true
   }

   //Button(Menu) Zurück zur MainActivity
   override fun onOptionsItemSelected(item: MenuItem): Boolean {
       when (item.itemId) {
           R.id.btn_info -> {
               info("")
               startActivity(intent)
               return super.onOptionsItemSelected(item)
           }
           else -> return super.onOptionsItemSelected(item)
       }
   }
   private fun info(msg: String) {
       Toast.makeText(this, msg, Toast.LENGTH_LONG)
       intent = Intent(this, InfoActivity::class.java)
   }


}


NewActivity:

Code:
package com.example.einkaufsliste

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_new.*
import java.util.jar.Attributes


class NewActivity : AppCompatActivity() {



   override fun onCreate(savedInstanceState: Bundle?) {
       super.onCreate(savedInstanceState)
       setContentView(R.layout.activity_new)

       btn_aktion.setOnClickListener {
           val dbHandler = MindOrksDBOpenHelper(this, null)
           val user = Attributes.Name(text_einkauf_eingabe.text.toString())
           dbHandler.addEinkauf(user)
           Toast.makeText(this, text_einkauf_eingabe.text.toString() + " auf die Liste", Toast.LENGTH_LONG).show()
       }

   }


       override fun onCreateOptionsMenu(menu: Menu): Boolean {
           val inflater = menuInflater
           inflater.inflate(R.menu.menu_back, menu)
           return true
       }

       //Button(Menu) Zurück zur MainActivity
       override fun onOptionsItemSelected(item: MenuItem): Boolean {
           when (item.itemId) {
               R.id.btn_back -> {
                   back("")
                   startActivity(intent)
                   return super.onOptionsItemSelected(item)
               }
               else -> return super.onOptionsItemSelected(item)
           }
       }
       private fun back(msg: String) {
           Toast.makeText(this, msg, Toast.LENGTH_LONG)
           intent = Intent(this, MainActivity::class.java)
       }
}

[b]DatenbankKlasse:[/b]

Code:
package com.example.einkaufsliste

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


class DatenbankKlasse(context: Context):
   SQLiteOpenHelper(context, "Einkaufsliste.db", null, 1) {

   override fun onCreate(db: SQLiteDatabase) {
       db.execSQL("CREATE TABLE [einkaufsliste]" +
               " ([id] INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," +
               "[einkauf] TEXT NOT NULL, [wert] INTEGER NOT NULL)")
   }

   override fun onUpgrade(db: SQLiteDatabase,
                          versionAlt: Int, versionNeu: Int) {
   }
}


[b][b]Einkauf:[/b][/b]

Code:
package com.example.einkaufsliste


class Einkauf  {
   var id: Int = 0
   var meinEinkauf: String? = null
   constructor(id: Int, meinEinkauf: String) {
       this.id = id
       this.meinEinkauf = meinEinkauf
   }
   constructor(meinEinkauf: String) {
       this.meinEinkauf = meinEinkauf
   }
}


[b][b][b]TableHelper:[/b][/b][/b]

Code:
package com.example.einkaufsliste

import android.content.ContentValues
import android.content.Context
import android.database.sqlite.SQLiteDatabase
import android.os.Build
import android.os.Build.ID
import android.util.Log
import com.example.einkaufsliste.MindOrksDBOpenHelper.Companion.COLUMN_EINKAUF
import com.example.einkaufsliste.MindOrksDBOpenHelper.Companion.TABLE_EINKAUF
import java.net.IDN

class TableHelper( context: Context) {

   private val helper = MindOrksDBOpenHelper(context, factory = null)

   fun speichereNeuenEintrag(daten: Einkauf): Long {
       //Öffnet eine beschreibbare Datenbank
       val db = helper.writableDatabase
       //Ein Datensatz ist eine Zeile in der SQLite Datenbank
       val datensatz = ContentValues()
       datensatz.put(COLUMN_EINKAUF, daten.meinEinkauf)

       db.beginTransaction()
       //Der Rückgabewert, also die ID des gespeicherten Objekts wird hier zurückgegeben.
       val id: Long = try {
           val id = db.insert(TABLE_EINKAUF, null, datensatz)
           db.setTransactionSuccessful()
           id
       }
       //Wenn die Operation beendet ist: empfange den Rückgabewert
       finally {
           db.endTransaction()
           db.close()
       }
       Log.i("test", "Datensatz in TABLE_Einkauf eingefügt. $id")
       return id
   }
   fun alleEintraege(): ArrayList<Einkauf>{
       val auswahl = arrayOf(TABLE_EINKAUF)
       val db = helper.writableDatabase
       val cursor = db.query(COLUMN_EINKAUF, auswahl, null, null, null, null, null)

       val ergebnisListe = ArrayList(alleEintraege())
       while (cursor.moveToNext()){
           var rueckgabe = Einkauf(0,"")
           rueckgabe.id = cursor.getInt(cursor.getColumnIndex(Build.ID))
           ergebnisListe.add(rueckgabe)
       }
       Log.i("test", "Ergebnisliste Alle Jobs enthält: $ergebnisListe")
       cursor.close()
       return ergebnisListe
   }
   fun loescheDatensatz(id :Int){
       val db = helper.writableDatabase
       db.delete(TABLE_EINKAUF,"${Build.ID}  = $id", null)
   }

}

[b][b][b][b]MindOrksDBOpenHelper:[/b][/b][/b][/b]

Code:
package com.example.einkaufsliste

import android.content.ContentValues
import android.content.Context
import android.database.Cursor
import android.database.sqlite.SQLiteDatabase
import android.database.sqlite.SQLiteOpenHelper
import java.util.jar.Attributes

class MindOrksDBOpenHelper(context: Context,
                          factory: SQLiteDatabase.CursorFactory?) :
   SQLiteOpenHelper(context, DATABASE_EINKAUF, null
       , DATABASE_VERSION) {
   override fun onCreate(db: SQLiteDatabase) {
       val TABLE_EINKAUF = ("CREATE TABLE " +
               TABLE_EINKAUF + "("
               + COLUMN_ID + " INTEGER PRIMARY KEY," +
               COLUMN_EINKAUF
               + " TEXT" + ")")
       db.execSQL(TABLE_EINKAUF)

   }

   override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {
       db.execSQL("DROP TABLE IF EXISTS " + TABLE_EINKAUF)
       onCreate(db)

   }

   fun addEinkauf(einkauf: Attributes.Name) {
       val values = ContentValues()
       values.put(COLUMN_EINKAUF, einkauf.javaClass.toString())
       val db = this.writableDatabase
       db.insert(TABLE_EINKAUF, null, values)
       db.close()
   }
   fun getAllName(): Cursor? {
       val db = this.readableDatabase
       return db.rawQuery("SELECT * FROM $TABLE_EINKAUF", null)
   }
   companion object {
       private val DATABASE_VERSION = 1
       private val DATABASE_EINKAUF = "Einkaufsliste.db"
       val TABLE_EINKAUF = "Einkauf"
       val COLUMN_ID = "id"
       val COLUMN_EINKAUF = "meinEinkauf"
   }
}


[b][b][b][b]Ich bedanke mich im Voraus..[/b][/b][/b][/b]
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