I want to populate a listview from SQliteDatabase in Android Studio but the app crashes

I have a project that I want to populate a listview with an SqlDatabase in android studio but when I run the app it carshes. please I need help with this project.

Adapter Class

package com.rawa.poplistview;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import com.rawa.poplistview.R;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by RRR on 3/8/2016.
 */
public class Adapter extends ArrayAdapter<Item> {
    private Activity activity;
    int id;
    ArrayList<Item> items;
    public Adapter(Activity context, int resource, ArrayList<Item> objects) {
        super(context, resource, objects);
        this.activity = context;
        this.id = resource;
        this.items = objects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
       if (convertView==null){
           LayoutInflater inflater = activity.getLayoutInflater();
           convertView = inflater.inflate(id,null);
       }
        Item item =items.get(position);
        TextView tv_id = (TextView) convertView.findViewById(R.id.tv_id);
        TextView tv_title = (TextView) convertView.findViewById(R.id.tv_title);
        TextView tv_content = (TextView) convertView.findViewById(R.id.tv_content);

        tv_id.setText(item.getId());
        tv_title.setText(item.getTitle());
        tv_content.setText(item.getContent());
        return convertView;
    }
}

Database Helper

package com.rawa.poplistview;

import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.nfc.Tag;
import android.util.Log;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;


public class DatabaseHelper extends SQLiteOpenHelper {
    private static String DB_Path = "data/data/com.rawa.poplistview/";
    private static String DB_Name = "my_database.sqlite";
    private SQLiteDatabase myDatabase;
    private final Context myContext;
    public DatabaseHelper(Context context) {
        super(context, DB_Name, null, 1);
        this.myContext = context;
    }

    @Override
    public void onCreate(SQLiteDatabase db) {

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
    private boolean checkDatabase(){
        SQLiteDatabase checkDB=null;
        try {
            String myPath = DB_Path + DB_Name;
            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
        } catch (SQLException e) {
        } if (checkDB != null) checkDB.close();
        return checkDB != null ? true : false;
    }
    private void copyDatabase() throws IOException {
        InputStream myInput = myContext.getAssets().open(DB_Name);
        String outFileName = DB_Path+DB_Name;
        OutputStream myOutput = new FileOutputStream(outFileName);
        byte[] buffer = new byte[1024];
        int length;
        while ((length= myInput.read(buffer))>0){
            myOutput.write(buffer, 0, length);
        }
        myOutput.flush();
        myOutput.close();
        myOutput.close();
    }
    public void openDatabase() throws SQLException {
        String myPath = DB_Path + DB_Name;
        myDatabase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
    }
    public void ExeSQLData(String sql) throws SQLException {
        myDatabase.execSQL(sql);
    }
    public Cursor QueryData(String query) throws SQLException {
        return myDatabase.rawQuery(query,null);
    }

    @Override
    public synchronized void close(){
        if (myDatabase!=null)
            myDatabase.close();
        super.close();
    }
    public void checkAndCopyDatabase() {
        boolean dbExist = checkDatabase();
        if(dbExist){
            Log.d("Tag","Database already Exist");
        } else {
            this.getReadableDatabase();
            try {
                copyDatabase();
            } catch (IOException e){
                Log.d("Tag","Error Copying Database");
            }
        }
    }
}

Item Class

package com.rawa.poplistview;

/**
 * Created by RRR on 3/8/2016.
 */
public class Item {

    private String id;
    private String title;
    private String content;

    public String getId() {
        return id;
    }

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

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }
}

MainActivity Class

package com.rawa.poplistview;

import android.database.Cursor;
import android.database.SQLException;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    ListView listViewVar;
    private DatabaseHelper dbHelper;
    ArrayList<Item> arrayList = new ArrayList<Item>();
    Adapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        dbHelper =new DatabaseHelper(this);
        try {
            dbHelper.checkAndCopyDatabase();
            dbHelper.openDatabase();
        } catch (SQLException e){

        }
        try {
            Cursor cursor = dbHelper.QueryData("SELECT * FROM my_database");
            if(cursor != null){
                if (cursor.moveToFirst()){
                    do {
                        Item item = new Item();
                        item.setId(cursor.getString(0));
                        item.setTitle(cursor.getString(1));
                        item.setContent(cursor.getString(2));
                        arrayList.add(item);
                    } while (cursor.moveToNext());
                }
            }
        } catch (SQLException e){
            adapter = new Adapter(this,R.layout.custom_list_item,arrayList);
            listViewVar = (ListView) findViewById(R.id.list_item);
            listViewVar.setAdapter(adapter);
            adapter.notifyDataSetChanged();
        }

    }
}