Android String Resource Not Found Exception

So, in my application, I have an edit text that changes based on the click of a button inside my list. For this I used an interface and a custom adapter. The app launches fine, but when I try to click the button, the app crashes and throws "resource not found exception". Can anyone help fix this error?

My main activity

package com.example.rory.dbtest;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.os.Handler;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

import com.pinchtapzoom.R;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.SQLException;

public class MyActivity extends Activity implements MyAdapterInterface{

    private CustomCursorAdapter customAdapter;
    public ListView list1;

    com.example.rory.dbtest.DBAdapter db = new com.example.rory.dbtest.DBAdapter(this);
    public MyActivity mMyActivity;


    //public EditText TotalCost;
    //public EditText TotalLitres;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);

        list1 = (ListView)findViewById(R.id.data_list);
        db.open();

        mMyActivity = this;

        Button addBtn = (Button)findViewById(R.id.add);
        addBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent i = new Intent(MyActivity.this, addassignment.class);
                startActivity(i);
            }
        });

        Button deleteBtn = (Button)findViewById(R.id.delete);
        deleteBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent i = new Intent(MyActivity.this, Delete.class);
                startActivity(i);
            }
        });

        Button updateBtn = (Button)findViewById(R.id.update);
        updateBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent i = new Intent(MyActivity.this, Update.class);
                startActivity(i);
            }
        });


        try {
            String destPath = "/data/data/" + getPackageName() + "/databases/AssignmentDB";
            File f = new File(destPath);
            if (!f.exists()) {
                CopyDB( getBaseContext().getAssets().open("mydb"),
                        new FileOutputStream(destPath));
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }


        new Handler().post(new Runnable() {
            @Override
            public void run() {
                //Log.d("test", "customadapter is " + customAdapter.toString());
                //Log.d("test", "databaseHelper is " + databaseHelper.toString());
                customAdapter = new CustomCursorAdapter(MyActivity.this, db.getAllRecords(), mMyActivity);
                list1.setAdapter(customAdapter);
            }
        });

    }

    public void updateEditText(int value)
    {
        EditText myEditText = (EditText)findViewById(R.id.edit1);
        myEditText.setText(value);
    }

    private class DBAdapter extends BaseAdapter {
        private LayoutInflater mInflater;
        //private ArrayList<>

        @Override
        public int getCount() {

            return 0;
        }

        @Override
        public Object getItem(int arg0) {

            return null;
        }

        @Override
        public long getItemId(int arg0) {

            return 0;
        }

        @Override
        public View getView(int arg0, View arg1, ViewGroup arg2) {

            return null;
        }

    }

    public void CopyDB(InputStream inputStream, OutputStream outputStream)
            throws IOException {
        //---copy 1K bytes at a time---
        byte[] buffer = new byte[1024];
        int length;
        while ((length = inputStream.read(buffer)) > 0) {
            outputStream.write(buffer, 0, length);
        }
        inputStream.close();
        outputStream.close();
    }
}

      

        
        
        
      

    

My custom adapter

package com.example.rory.dbtest;

/**
 * Created by Rory on 02/11/2014.
 */
import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.CursorAdapter;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.pinchtapzoom.R;


public class CustomCursorAdapter extends CursorAdapter{

    public int counter = 0;
    private MyAdapterInterface mMyInterface;

    public CustomCursorAdapter(Context context, Cursor c, MyAdapterInterface myInterface) {

        super(context, c);
        this.context = context;
        this.mMyInterface = myInterface;
    }
    Context context;


    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        // when the view will be created for first time,
        // we need to tell the adapters, how each item will look
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View retView = inflater.inflate(R.layout.row, parent, false);

        return retView;
    }

    public void bindView(View view, Context context, Cursor cursor) {
        // here we are setting our data
        // that means, take the data from the cursor and put it in views
        TextView textViewPersonName = (TextView) view.findViewById(R.id.item1);
        textViewPersonName.setText(cursor.getString(cursor.getColumnIndex(cursor.getColumnName(1))));

        final EditText edit1 = (EditText) view.findViewById(R.id.runningTotal);

        Button plusButton = (Button) view.findViewById(R.id.plusButton);
        plusButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                counter++;
                edit1.setText(Integer.toString(counter));
                mMyInterface.updateEditText(counter);
            }
        });

        final Button minusButton = (Button) view.findViewById(R.id.minusButton);
        minusButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                counter--;
                edit1.setText(Integer.toString(counter));
                mMyInterface.updateEditText(counter);
            }
        });
    }
}

      

        
        
        
      

    

Logcat error

Process: com.example.rory.dbtest, PID: 32185
android.content.res.Resources$NotFoundException: String resource ID #0xffffffff
        at android.content.res.Resources.getText(Resources.java:244)
        at android.widget.TextView.setText(TextView.java:3888)
        at com.example.rory.dbtest.MyActivity.updateEditText(MyActivity.java:112)
        at com.example.rory.dbtest.CustomCursorAdapter$2.onClick(CustomCursorAdapter.java:66)
        at android.view.View.performClick(View.java:4438)