Ich erhalte einen Fehler beim Aufruf einer Methode und beim Speichern ihres Objekts

Question

Ich versuche eine Aktivität zu erstellen, wo ich eine bestimmte Zeile aus der ListView auswählen kann, die aus der Datenbank abgerufen wird, so dass ich sie manipulieren kann, aber wenn ich Wenn ich diese Zeile auswähle, stoppt meine Anwendung leider.

Here I am getting a android.content.res.Resources$NotFoundException: String resource ID #0x0 Beim Versuch, eine Zeile aus der Datenbank auszuwählen, erhalte ich eine Laufzeitausnahme.

das ist meine databasehelper Klasse

databasehelper.java 

package com.example.ashwanislaptop.expensemanager; 

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.util.Log; 

import java.util.ArrayList; 
import java.util.List; 
public class DatabaseHelper extends SQLiteOpenHelper { 

    public static final String DATABASE_NAME="Transaction.db"; 
    public static final String TABLE_NAME="transaction_table"; 
    public static final String COL_1="ID"; 
    public static final String COL_2="PRICE"; 
    public static final String COL_3="DATE"; 
    public static final String COL_4="TIME"; 
    public static final String COL_5="DESCRIPTION"; 
    public static final String COL_6="CATEGORY"; 
    public static final String COL_7="PAYMENT_MODE"; 
    private static final String TAG="DatabaseHelper"; 


    public DatabaseHelper(Context context) { 
     super(context, DATABASE_NAME, null, 1); 

    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     db.execSQL("CREATE TABLE IF NOT EXISTS "+TABLE_NAME+"(ID INTEGER PRIMARY KEY AUTOINCREMENT,PRICE INTEGER NOT NULL,DATE TEXT NOT NULL,TIME TEXT NOT NULL,DESCRIPTION TEXT NOT NULL,CATEGORY TEXT NOT NULL,PAYMENT_MODE TEXT NOT NULL);"); 


    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int i, int i1) { 
     db.execSQL("DROP TABLE IF EXISTS transaction_table"); 
     onCreate(db); 
    } 



    void InsertData(Transaction t){ 
     SQLiteDatabase db=getWritableDatabase(); 
     ContentValues cv=new ContentValues(); 
     cv.put(COL_2,t.getPrice()); 
     cv.put(COL_3,t.getDate()); 
     cv.put(COL_4,t.getTime()); 
     cv.put(COL_5,t.getDescription()); 
     cv.put(COL_6,t.getCategory()); 
     cv.put(COL_7,t.getPayment_mode()); 
     db.insert(TABLE_NAME,null,cv); 
     db.close(); 
    } 
    public ArrayList<Transaction> getAllTransaction() { 

     SQLiteDatabase db = getReadableDatabase(); 
     Log.i(TAG, "getAllTransaction: getting Transaction Record"); 
     Cursor c = db.rawQuery("Select * From transaction_table", null); 
     if (c.moveToFirst()) { 
      ArrayList<Transaction> list = new ArrayList<>(); 
      do { 
       Transaction t = new Transaction(c.getString(1),c.getString(2), c.getString(5)); 
       list.add(t); 
       Log.i(TAG, "GetAllTranscRecords: one record retrieved"); 

      }while (c.moveToNext()); 
      return list; 
     } 
     else 
     { 
      Log.i(TAG,"No record found"); 
      db.close(); 
      return null; 
     } 
    } 
[getting an runtime error while calling it from the Transaction_Detail.java] 


    ***Transaction getAllTransactionssecond(int idd) { 
     Log.i(TAG, "getAllTransactionssecond: "+idd); 
     SQLiteDatabase db = getReadableDatabase(); 
    Log.i(TAG, "getAllTransaction: getting Transaction Record of id "+idd); 
    Cursor c = db.rawQuery("Select * From transaction_table where id="+idd+";", null); 

[Die Ausführung abstürzt genau an dieser Stelle, wie kann ich die Daten an die Transaction_details senden, so dass ich die Daten in der Textviews drucken] Transaktion t = new Transaktion (c.getString (1), c.getString (2), c.getString (3), c.getString (4), c.getString (5), c.getString (6)); Log.i (TAG, "GetAllTransCRecords: ein Datensatz abgerufen"); // Log.i (TAG, "Kein Datensatz gefunden"); db.close(); Rückkehr t; } ***

public ArrayList<Transaction> getAllTransactioncategorywise(){ 

     SQLiteDatabase db=getReadableDatabase(); 
     Log.i(TAG,"getAllTransaction: getting Transaction Record"); 
     Cursor c=db.rawQuery("Select * From transaction_table order by "+COL_6+";",null); 
     if(c.moveToFirst()){ 
      ArrayList<Transaction> list=new ArrayList<>(); 
      do{ 
       Transaction t=new Transaction(c.getString(1),c.getString(2),c.getString(5)); 
       list.add(t); 
       Log.i(TAG,"GetAllTranscRecords: one record retrieved"); 

      }while (c.moveToNext()); 
      return list; 
     } 
     else 
     { 
      Log.i(TAG,"No record found"); 
      db.close(); 
      return null; 
     } 
    } 
    public ArrayList<Transaction> getAllTransactiondatewise(){ 

     SQLiteDatabase db=getReadableDatabase(); 
     Log.i(TAG,"getAllTransaction: getting Transaction Record"); 
     Cursor c=db.rawQuery("Select * From transaction_table order by "+COL_3+" desc",null); 
     if(c.moveToFirst()){ 
      ArrayList<Transaction> list=new ArrayList<>(); 
      do{ 
       Transaction t=new Transaction(c.getString(1),c.getString(2),c.getString(5)); 
       list.add(t); 
       Log.i(TAG,"GetAllTranscRecords: one record retrieved"); 

      }while (c.moveToNext()); 
      return list; 
     } 
     else 
     { 
      Log.i(TAG,"No record found"); 
      db.close(); 
      return null; 
     } 
    } 

} 

[Dies ist meine Details der Transaktion Klasse]

transaction detail.java 
package com.example.ashwanislaptop.expensemanager; 

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.widget.TextView; 

import java.util.ArrayList; 

public class Transaction_Details extends AppCompatActivity { 
    private TextView txtid,txtprice,txtdate,txttime,txtcateg,txtpayment,txtdecription; 
    private DatabaseHelper ta; 
    public static final String TAG="Trasaction detail"; 
    public int sentid; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_transaction__details); 
     Log.i(TAG, "onCreate: before intent"); 
     Intent i1=getIntent(); 
     sentid=i1.getIntExtra("STRING",0); 
     Log.i(TAG, "onCreate: after intent "+sentid); 

     txtid=(TextView)findViewById(R.id.txtid); 
     txtdate=(TextView)findViewById(R.id.txtdate); 
     txttime=(TextView)findViewById(R.id.txttime); 
     txtcateg=(TextView)findViewById(R.id.txtcateg); 
     txtpayment=(TextView)findViewById(R.id.txtpayment); 
     txtdecription=(TextView)findViewById(R.id.txtdescription); 
     ta=new DatabaseHelper(this); 

[Ich bin der Lage, die Daten abzurufen]

 **Transaction details=ta.getAllTransactionssecond(sentid);** 



     txtid.setText(details.getId()); 
     txtdate.setText(details.getDate()); 
     txttime.setText(details.getTime()); 
     txtcateg.setText(details.getCategory()); 
     txtprice.setText(details.getPrice()); 
     txtpayment.setText(details.getPayment_mode()); 
     txtdecription.setText(details.getDescription()); 
    } 
} 

Transaction.java 
package com.example.ashwanislaptop.expensemanager; 


public class Transaction { 
    private int id; 
    private String price,date,time,description,category,payment_mode; 

    public Transaction() { 
    } 

    public Transaction(int id, String price, String date, String time, String description, String category, String payment_mode) { 
     this.id = id; 
     this.price = price; 
     this.date = date; 
     this.time = time; 
     this.description = description; 
     this.category = category; 
     this.payment_mode = payment_mode; 
    } 

    public Transaction(String price, String date, String time, String description, String category, String payment_mode) { 
     this.price = price; 
     this.date = date; 
     this.time = time; 
     this.description = description; 
     this.category = category; 
     this.payment_mode = payment_mode; 
    } 

    public Transaction(String price, String date, String category) { 
     this.category = category; 
     this.date = date; 
     this.price = price; 
    } 

    public int getId() { 
     return id; 
    } 

    public void setId(int id) { 
     this.id = id; 
    } 

    public String getPrice() { 
     return price; 
    } 

    public void setPrice(String price) { 
     this.price = price; 
    } 

    public String getDate() { 
     return date; 
    } 

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

    public String getTime() { 
     return time; 
    } 

    public void setTime(String time) { 
     this.time = time; 
    } 

    public String getDescription() { 
     return description; 
    } 

    public void setDescription(String description) { 
     this.description = description; 
    } 

    public String getCategory() { 
     return category; 
    } 

    public void setCategory(String category) { 
     this.category = category; 
    } 

    public String getPayment_mode() { 
     return payment_mode; 
    } 

    public void setPayment_mode(String payment_mode) { 
     this.payment_mode = payment_mode; 
    } 
} 

[Dies ist meine AllTransaction Klasse ]

AllTansactionFragment.java 
package com.example.ashwanislaptop.expensemanager; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.annotation.Nullable; 
import android.support.v4.app.Fragment; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
import android.widget.Toast; 

import java.text.SimpleDateFormat; 
import java.util.ArrayList; 
import java.util.Collection; 
import java.util.Collections; 
import java.util.Comparator; 
import java.util.List; 

/** 
* Created by Welcome on 06-Aug-16. 
*/ 
public class AllTransactionFragment extends Fragment { 
private static final String TAG="AllTransactionFragment"; 
    private ListView listView; 
    private DatabaseHelper ta=null; 
    //private ArrayAdapter<String> aa=null; 

    @Nullable 
    @Override 
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 
     View vu=inflater.inflate(R.layout.alltransactionlistview,container,false); 
     listView=(ListView)vu.findViewById(R.id.lvtransaction); 
     ta=new DatabaseHelper(getActivity()); 
     Log.i(TAG, "onCreateView:"+ta); 
     ArrayList<Transaction> list=ta.getAllTransactiondatewise(); 

     Collections.sort(list, new Comparator<Transaction>() { 
      @Override 
      public int compare(Transaction t1, Transaction t2) { 
       SimpleDateFormat dateFormat=new SimpleDateFormat("dd-mm-yyyy"); 
       if(t1.getDate()==null || t2.getDate()==null) 
        return 0; 
       return t1.getDate().compareTo(t2.getDate()); 
      } 
     }); 

     TransactionListAdapter aa=new TransactionListAdapter(getActivity(),list); 
     listView.setAdapter(aa); 
     listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { 
       Log.i(TAG, " onItemClick: "); 
       Toast.makeText(getActivity(),"Clicked on:"+i,Toast.LENGTH_SHORT).show(); 
       Intent ii=new Intent(getActivity(),Transaction_Details.class); 
       ii.putExtra("STRING",i); 
       Log.i(TAG, "onItemClick: after"); 
       startActivity(ii); 
      } 
     }); 

     return vu; 
    } 
} 

Answer 1

Initialisieren Sie Ihre DatabaseHelper. Es ist null.