Baza do pliku

package com.example.txt_z_bd;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
	public boolean databaseExist()
	{
	    File dbFile = new File(Environment.getExternalStorageDirectory().getPath()+"/"+"ParkHotel.db");
	    return dbFile.exists();
	}
	
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		final File file=new File(Environment.getExternalStorageDirectory().getPath()+"/"+"dane.txt");
		Button bID=(Button)findViewById(R.id.buttonID);
		
		bID.setOnClickListener(new OnClickListener() {	
			@Override
			public void onClick(View v) {
				databaseExist();
				SQLiteDatabase baza=openOrCreateDatabase(Environment.getExternalStorageDirectory().getPath()
                                +"/"+"ParkHotel.db", SQLiteDatabase.OPEN_READWRITE, null);
				String kolumny[]={"kod_kreskowy","nazwa"};
				Cursor kursor=baza.query("Towary", kolumny, null, null, null, null, null);
				kursor.moveToFirst();

				for(int i=1;i<kursor.getCount();i++)
				{	
					String kod=kursor.getString(0);
					String nazwa=kursor.getString(1);		
			    	FileOutputStream fos=null;				
				      try {
				    	fos=new FileOutputStream(file,true);
						fos.write((kod+", "+nazwa+";\n").getBytes());				
						fos.close();
				  	} catch (FileNotFoundException e1) {
				  		e1.printStackTrace();
				  	} catch (IOException e) {
				  		e.printStackTrace();
				  	}			
				      kursor.moveToNext();
				}		
				baza.close();
				kursor.close();
			}
		});
	}
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
}