import android.content.Context;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.net.Uri;
import android.os.Environment;
import android.preference.PreferenceManager;
import android.util.Base64;
import android.util.Log;
import android.widget.Toast;
import java.io.ByteArrayOutputStream;
import java.io.File;
import static java.io.File.separator;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.GZIPOutputStream;

/**
*
* @author
* freelancer
*/
public class FileStuff {

private static final String EXTERNAL_DIRECTORY = Environment.getExternalStorageDirectory().toString();//text
public static final String DATA_DIRECTORY = EXTERNAL_DIRECTORY + separator + "your dir" + separator + "Data";
private static final String INNER_DELIMITER = ",";//text
private static final String QUOTES = "\"";//text
private static final String LINE_END = "\n";//text
public String fileError, fileinfo, TAG = this.getClass().getSimpleName();
;

/* Checks if external storage is available for read and write */

private boolean isExternalStorageWritable() {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
return true;
}
return false;
}

/* Checks if external storage is available to at least read */
public boolean isExternalStorageReadable() {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)
|| Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
return true;
}
return false;
}

/* Create data dir or return it */
private File getDataDir(String tableCsv) throws IOException {
// Get the directory for the app data directory.
String f = tableCsv + ".csv";
File dataDirectory = new File(DATA_DIRECTORY, f);
dataDirectory.delete();
if (!dataDirectory.exists()) {
File path = new File(DATA_DIRECTORY);//create directory
path.mkdirs();
if (!dataDirectory.createNewFile()) {
Log.e("getStorageDir", "file " + f + " not created");
fileError = "file " + f + " not created";
fileinfo = "unable to create backup file";
return null;
}
}
return dataDirectory;
}

public boolean createCsvSaveToFile(Cursor cursor, String fileName, Context c) throws IOException {
String ccsv = "", csv = "";
int colunmCount = cursor.getColumnCount(), i;
//check if extarnal drive is readerble
if (!isExternalStorageWritable()) {
fileError = "Can not save to external storage";
fileinfo = "Please mount your SD card";
return false;
} else {
//create CSV
for (i = 0; i < colunmCount; i++) {//GET COLUNM NAMES
csv += QUOTES + cursor.getColumnName(i).toString() + QUOTES + INNER_DELIMITER;
}
csv = csv.replaceAll(",$", "");

csv += LINE_END;
if (cursor.moveToFirst()) {
do {
for (i = 0; i < colunmCount; i++) {//GET COLUNM values
ccsv += QUOTES + cursor.getString(i) + QUOTES + INNER_DELIMITER;
}
ccsv = ccsv.replaceAll(",$", "");
//encrypt
ccsv = encry(ccsv, keey);
csv += ccsv;
ccsv = "";
csv += LINE_END;
} while (cursor.moveToNext());
}

//save file
File file = getDataDir(fileName);
FileOutputStream out = new FileOutputStream(file);
out.write(csv.getBytes());
out.flush();
out.close();
if (!cursor.isClosed()) {
cursor.close();
}
return true;
}
}
}