Develop Reference

Android notifyDataSetChanged not refreshing the items after removing

So I am trying to remove the itempending however it does not remove it from the listview immediately on click. I have to go back and come back to this screen and it will be removed. However my other listview on the same screen was updated immediately (The submitted profile method). I tried to create a method that does the same function I need and call it in before the notifyDataSetChanged but nothing works. Any advise on why my notifyDataSetChanged is not working would be appreciated thanks.
ArrayAdapter<String> adapterSubmit, adapterPending;
ArrayList<String> itemsSubmit, itemsPending;
ListView lstSubmitPro, lstPendingPro;
String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/CaptureLogs";
Button btnSubmit;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_pro_list);
btnSubmit = (Button) findViewById(R.id.btnTest);
lstSubmitPro = (ListView) findViewById(R.id.lstSubmitPro);
lstPendingPro = (ListView) findViewById(R.id.lstPendingPro);
itemsSubmit = new ArrayList<String>();
adapterSubmit = new ArrayAdapter(this, R.layout.prolist, R.id.tvRows, itemsSubmit);
lstSubmitPro.setAdapter(adapterSubmit);
itemsPending = new ArrayList<String>();
adapterPending = new ArrayAdapter(this, android.R.layout.simple_list_item_multiple_choice, itemsPending);
lstPendingPro.setAdapter(adapterPending);
lstPendingPro.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
pendingSubmitProfile();
SubmittedProfile();
btnSubmit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
SparseBooleanArray sp = lstPendingPro.getCheckedItemPositions();
if (sp!= null) {
for (int i = 0; i < sp.size(); i++) {
if (sp.valueAt(i) == true) {
SubmittedProfile();
adapterSubmit.notifyDataSetChanged();
itemsPending.remove(sp.get(i));
adapterPending.notifyDataSetChanged();
Toast.makeText(ProList.this, "Your profiles have been submitted successfully.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(ProList.this, "Please choose a profile to be submitted.", Toast.LENGTH_LONG).show();
}
}
}
}
});
public void pendingSubmitProfile()
{
File dir = new File(path);
File[] files = dir.listFiles();
for (File f : files) {
if (f.isFile()) {
BufferedReader inputStream = null;
try {
inputStream = new BufferedReader(new FileReader(f));
String lineToRead = "--PENDING SUBMIT--";
String CurrentLine;
while ((CurrentLine = inputStream.readLine()) != null) {
if (CurrentLine.equals(lineToRead)) {
String filen = f.getName().substring(0, f.getName().lastIndexOf("."));
itemsPending.add(filen);
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public void SubmittedProfile()
{
File dir = new File(path);
File[] files = dir.listFiles();
for (File f : files) {
if (f.isFile()) {
BufferedReader inputStream = null;
try {
inputStream = new BufferedReader(new FileReader(f));
String lineToRead = "--SUBMITTED--";
String CurrentLine;
while ((CurrentLine = inputStream.readLine()) != null) {
if (CurrentLine.equals(lineToRead)) {
String filen = f.getName().substring(0, f.getName().lastIndexOf("."));
itemsSubmit.add(filen);
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
LOG
Before, 2 items but 1 checked
05-02 08:00:02.409 4293-4293/com.example.irambi.irmobilewizard D/returned value:: 2 1 2
After, 2 items but 1 checked
05-02 08:00:03.726 4293-4293/com.example.irambi.irmobilewizard D/returned value:: 0 1 0
This is for 1 item and 1 checked. I cannot tell if this is before or after since theres only 1 printed on logcat. This will crash and error is as follows
05-02 08:03:35.345 4293-4293/com.example.irambi.irmobilewizard D/returned value:: 1 1 1
java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
Before, 2 items but 2 checked
05-02 08:07:56.378 4596-4596/com.example.irambi.irmobilewizard D/returned value:: 2 2 2
After, 2 items but 2 checked - This will crash
05-02 08:07:57.671 4596-4596/com.example.irambi.irmobilewizard D/returned value:: 0 2 0
java.lang.IndexOutOfBoundsException: Invalid index 1, size is 0
All the testing are done using
itemsPending.remove(sp.keyAt(i));
adapterPending.remove(adapterPending.getItem(sp.keyAt(i)));
Log based on:
Log.d("returned value:", itemsPending.size() + " " + sp.size() + " " + adapterPending.getCount());

Try this one
itemsPending.remove(sp.keyAt(i));
adapterPending.remove(adapterPending.getItem(sp.keyAt(i)));
adapterPending.notifyDataSetChanged();
EDIT:
So basically the switching of list data is working fine. What's messing the code is his file writing. I resolve it this way.
First is a create a function that would update my Pending Files to submitted.
public void submitPendingProfile(String filename){
try {
BufferedReader file = new BufferedReader(new FileReader(path + "/" + filename+".txt"));
String line;
StringBuffer inputBuffer = new StringBuffer();
while ((line = file.readLine()) != null) {
inputBuffer.append(line);
inputBuffer.append('\n');
}
String inputStr = inputBuffer.toString();
file.close();
inputStr = inputStr.replace("--PENDING SUBMIT--", "--SUBMITTED--");
FileOutputStream fileOut = new FileOutputStream(path + "/" + filename+".txt");
fileOut.write(inputStr.getBytes());
fileOut.close();
} catch (Exception e) {
System.out.println("Problem reading file.");
}
}
Then i refactor the loop for simplier process. Like removing the line SubmittedProfile(); that keeps reading all text files if conditions is true. That is a lot of process. Here's how instead.
for(int i = lstPendingPro.getAdapter().getCount() - 1 ; i >= 0; i--) {
if (sp.get(i)) {
//So when file is submitted, i update the files status using the above function.
submitPendingProfile(itemsPending.get(i));
//To avoid rereading of files, just add the item before removing it to the pending list
itemsSubmit.add(itemsPending.get(i));
adapterSubmit.notifyDataSetChanged();
itemsPending.remove(sp.keyAt(i));
adapterPending.notifyDataSetChanged();
Toast.makeText(ProList.this, "Your profiles have been submitted successfully.", Toast.LENGTH_LONG).show();
}
}

Did You tried changing your code to this order
btnSubmit.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick (View v){
SparseBooleanArray sp = lstPendingPro.getCheckedItemPositions();
if (sp != null) {
for (int i = 0; i < sp.size(); i++) {
if (sp.valueAt(i) == true) {
SubmittedProfile();
itemsPending.remove(sp.get(i));
Toast.makeText(ProList.this, "Your profiles have been submitted successfully.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(ProList.this, "Please choose a profile to be submitted.", Toast.LENGTH_LONG).show();
}
}
}
adapterSubmit.notifyDataSetChanged();
adapterPending.notifyDataSetChanged();
}
});

Try this code..
itemsPending.remove(itemsPending.indexOf(sp.get(i)));
adapterPending.notifyDataSetChanged();

itemsPending.remove(sp.get(i));
adapterPending.notifyDataSetChanged();
listview.invalidate();
Try above code might be it will help you.

cant update data in sqlite database

TextView desc,details,responsibility,status,txtdate;
EditText equipment_id;
DBController controller = new DBController(this,null,null,1);
ImageButton btnupdate;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_update_equiments);
equipment_id = (EditText)findViewById(R.id.txtequipmentid);
desc = (TextView)findViewById(R.id.txtdescription);
details = (TextView)findViewById(R.id.txtdetails);
status = (TextView)findViewById(R.id.txtstatus);
txtdate = (TextView)findViewById(R.id.txtdate);
responsibility = (TextView)findViewById(R.id.txtresponsibilitycenter);
btnupdate = (ImageButton)findViewById(R.id.btnupdate);
//desc.setVisibility(View.GONE);
//details.setVisibility(View.GONE);
// responsibility.setVisibility(View.GONE);
// btnupdate.setVisibility(View.GONE);
Calendar c = Calendar.getInstance();
SimpleDateFormat df = new SimpleDateFormat("dd-MMM-yyyy");
String formattedDate = df.format(c.getTime());
txtdate.setText(formattedDate);
//update data
btnupdate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
//String status = "1";
controller = new DBController(getApplicationContext(), null, null ,1);
SQLiteDatabase database = controller.getWritableDatabase();
ContentValues data = new ContentValues();
data.put("description", desc.getText().toString());
data.put("details", details.getText().toString());
data.put("responsibility_center",responsibility.getText().toString());
data.put("status", status.getText().toString());
data.put("date_taken", txtdate.getText().toString());
database.update("tbl_equipments", data, "equipment_id=" + equipment_id.getText().toString(), null);
//database.update("tbl_equipments", data, "equipment_id=" + equipment_id.getText().toString(), null);
Toast.makeText(Search_Equipments.this, "Updated successfully", Toast.LENGTH_SHORT).show();
} catch (Exception ex) {
Toast.makeText(Search_Equipments.this,ex.getMessage(), Toast.LENGTH_SHORT).show();
}
}
});
}
//search equipment
public void searchEquipment(View view){
if (equipment_id.getText().toString().equals("")){
Toast.makeText(Search_Equipments.this,"Please Enter Equipement No.",Toast.LENGTH_LONG).show();
} else {
controller = new DBController(this, null, null , 1);
Equipment equipment = controller.getEquipment(equipment_id.getText().toString());
if (equipment != null){
desc.setText(String.valueOf(equipment.get_description()));
details.setText(String.valueOf(equipment.get_details()));
responsibility.setText(String.valueOf(equipment.get_responsibility()));
desc.setVisibility(View.VISIBLE);
details.setVisibility(View.VISIBLE);
responsibility.setVisibility(View.VISIBLE);
btnupdate.setVisibility(View.VISIBLE);
}else {
Toast.makeText(Search_Equipments.this,"Not Found",Toast.LENGTH_LONG).show();
}
}
}
can someone help my code. if passed the condition that data successfully updated but when i display the updated data from database data has not updated, can someone help me to fix this. . . . . . because i dont where is my error there. see my update code. thanks :)

You forgot to commit the transaction.
database.setTransactionSuccessful();
database.endTransaction();

How to find mp3 files from sdcard in android programatically

I am new to android programming so can anyone please help me to find all .mp3 files in my android device.

You should use MediaStore. Here is an example code i'm using for something similar:
private static ArrayList<SongModel> LoadSongsFromCard() {
ArrayList<SongModel> songs = new ArrayList<SongModel>();
// Filter only mp3s, only those marked by the MediaStore to be music and longer than 1 minute
String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0"
+ " AND " + MediaStore.Audio.Media.MIME_TYPE + "= 'audio/mpeg'"
+ " AND " + MediaStore.Audio.Media.DURATION + " > 60000";
final String[] projection = new String[] {
MediaStore.Audio.Media._ID, //0
MediaStore.Audio.Media.TITLE, //1
MediaStore.Audio.Media.ARTIST, //2
MediaStore.Audio.Media.DATA, //3
MediaStore.Audio.Media.DISPLAY_NAME
};
final String sortOrder = MediaStore.Audio.AudioColumns.TITLE
+ " COLLATE LOCALIZED ASC";
Cursor cursor = null;
try {
// the uri of the table that we want to query
Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; //getContentUriForPath("");
// query the db
cursor = _context.getContentResolver().query(uri,
projection, selection, null, sortOrder);
if (cursor != null) {
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
//if (cursor.getString(3).contains("AwesomePlaylists")) {
SongModel GSC = new SongModel();
GSC.ID = cursor.getLong(0);
GSC.songTitle = cursor.getString(1);
GSC.songArtist = cursor.getString(2);
GSC.path = cursor.getString(3);
// This code assumes genre is stored in the first letter of the song file name
String genreCodeString = cursor.getString(4).substring(0, 1);
if (!genreCodeString.isEmpty()) {
try {
GSC.genre = Short.parseShort(genreCodeString);
} catch (NumberFormatException ex) {
Random r = new Random();
GSC.genre = (short) r.nextInt(4);
} finally {
songs.add(GSC);
}
}
//}
cursor.moveToNext();
}
}
} catch (Exception ex) {
} finally {
if (cursor != null) {
cursor.close();
}
}
return songs;
}

Of course . you can . Code not tested.
File dir =new File(Environment.getExternalStorageDirectory());
if (dir.exists()&&dir.isDirectory()){
File[] files=dir.listFiles(new FilenameFilter(){
#Override
public boolean accept(File dir,String name){
return name.contains(".mp3");
}
});
}

You can use recursive searching. Use this function with path of directory where you wanna start search .mp3 files (for example "/mnt/sdcard").
public Vector<String> mp3Files = new Vector<String>();
private void searchInDirectory(String directory)
{
File dir = new File(directory);
if(dir.canRead() && dir.exists() && dir.isDirectory())
{
String []filesInDirectory = dir.list();
if(filesInDirectory != null)
{
for(int i=0; i<filesInDirectory.length; i++)
{
File file = new File(directory+"/"+filesInDirectory[i]);
if(file.isFile() && file.getAbsolutePath().toLowerCase(Locale.getDefault()).endsWith(".mp3"))
{
mp3Files.add(directory+"/"+filesInDirectory[i]);
}
else if(file.isDirectory() )
{
searchInDirectory(file.getAbsolutePath());
}
}
}
}
}

public ArrayList<String> searchMP3File(ArrayList<String> aListFilePath, String rootPath) {
File rootFile = new File(rootPath);
File[] aRootFileFilter = rootFile.listFiles(new FileFilter() {
#Override
public boolean accept(File pathname) {
if(pathname.getName().endsWith(".mp3"))
return true;
else
return false;
}
});
if(aRootFileFilter != null && aRootFileFilter.length > 0) {
for(int i = 0; i < aRootFileFilter.length; i++) {
aListFilePath.add(aRootFileFilter[i].getPath());
}
}
File[] aRootFile = rootFile.listFiles();
for(int i = 0; i < aRootFile.length; i++) {
if(aRootFile[i].isDirectory()) {
ArrayList<String> aListSubFile = searchMP3File(aListFilePath, aRootFile[i].getPath());
if(aListSubFile != null && aListSubFile.size() > 0)
aListFilePath = aListSubFile;
}
}
return aListFilePath;
}

private String[] videoExtensions;
videoExtensions = new String[2];
videoExtensions[0] = "mp3";
videoExtensions[1] = "3gp";
After this declaration in your onCreate() method, set below code in some method and call it. Do changes as per your need in my code.
try {
File file = new File("mnt/sdcard/DCIM/Camera");
File[] listOfFiles = file.listFiles();
videoArray = new ArrayList<HashMap<String, String>>();
videoHashmap = new HashMap<String, String>();
for (int i = videoIndex; i < listOfFiles.length; i++) {
File files = listOfFiles[i];
rowDataVideos = new HashMap<String, String>();
for (String ext : videoExtensions) {
if (files.getName().endsWith("." + ext)) {
videoHashmap.put("Video", files.getAbsolutePath());
videoArray.add(videoHashmap);
fileSize = files.length();
fileSizeInMb += convertSize(fileSize, MB);
thumb = ThumbnailUtils.createVideoThumbnail(files.getAbsolutePath(), MediaStore.Images.Thumbnails.MINI_KIND);
if (thumb != null) {
createTempDirectory();
try {
FileOutputStream out = new FileOutputStream(audiofile);
thumb.compress(Bitmap.CompressFormat.PNG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
// Tue Apr 23 16:08:28 GMT+05:30 2013
lastModDate = new Date(files.lastModified()).toString();
dateTime = (dateToMilliSeconds(lastModDate) / 1000L);
rowDataVideos.put(VIDEOPATH, files.getAbsolutePath());
rowDataVideos.put(VIDEOSTATUS, "0");
rowDataVideos.put(VIDEOSIZEINMB, String.valueOf(fileSizeInMb));
rowDataVideos.put(VIDEODATE, String.valueOf(dateTime));
if (dateTime > (RESPONSE_TIMESTAMP_VIDEO / 1000L)) {
dataProvider.InsertRow(VIDEOS, rowDataVideos);
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}

Android program to convert the SQLite database to excel

I want to change the sqlite database .db file to excel.
But I am not able to find what exactly I have to do. Can anybody please elaborate in a simple way what I have to perform to achieve this task.
By searching on Google, so many links appears, but I am not able to understand the step by step way to do this.
I have followed these links:
1. How to convert excel sheet into database of sqlite in android
2. SQlite database programmatically convert into Excel file format in Android
3. http://opencsv.sourceforge.net/

My solution is to convert the sqlite database into csv in first step then in second step is to convert the csv file to xls and it works fine for me, you will need 2 libraries (opencsv-1.7.jar; poi-3.8-20120326.jar)
public class ExportDatabaseCSVTask extends AsyncTask<String, Void, Boolean>
{
private final ProgressDialog dialog = new ProgressDialog(DatabaseExampleActivity.this);
#Override
protected void onPreExecute()
{
this.dialog.setMessage("Exporting database...");
this.dialog.show();
}
protected Boolean doInBackground(final String... args)
{
File dbFile=getDatabasePath("database_name");
//AABDatabaseManager dbhelper = new AABDatabaseManager(getApplicationContext());
AABDatabaseManager dbhelper = new AABDatabaseManager(DatabaseExampleActivity.this) ;
System.out.println(dbFile); // displays the data base path in your logcat
File exportDir = new File(Environment.getExternalStorageDirectory(), "");
if (!exportDir.exists())
{
exportDir.mkdirs();
}
File file = new File(exportDir, "excerDB.csv");
try
{
if (file.createNewFile()){
System.out.println("File is created!");
System.out.println("myfile.csv "+file.getAbsolutePath());
}else{
System.out.println("File already exists.");
}
CSVWriter csvWrite = new CSVWriter(new FileWriter(file));
//SQLiteDatabase db = dbhelper.getWritableDatabase();
Cursor curCSV=db.getdb().rawQuery("select * from " + db.TABLE_NAME,null);
csvWrite.writeNext(curCSV.getColumnNames());
while(curCSV.moveToNext())
{
String arrStr[] ={curCSV.getString(0),curCSV.getString(1),curCSV.getString(2)};
/*curCSV.getString(3),curCSV.getString(4)};*/
csvWrite.writeNext(arrStr);
}
csvWrite.close();
curCSV.close();
/*String data="";
data=readSavedData();
data= data.replace(",", ";");
writeData(data);*/
return true;
}
catch(SQLException sqlEx)
{
Log.e("MainActivity", sqlEx.getMessage(), sqlEx);
return false;
}
catch (IOException e)
{
Log.e("MainActivity", e.getMessage(), e);
return false;
}
}
protected void onPostExecute(final Boolean success)
{
if (this.dialog.isShowing())
{
this.dialog.dismiss();
}
if (success)
{
Toast.makeText(DatabaseExampleActivity.this, "Export succeed", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(DatabaseExampleActivity.this, "Export failed", Toast.LENGTH_SHORT).show();
}
}}
Export CSV to XLS part
public class CSVToExcelConverter extends AsyncTask<String, Void, Boolean> {
private final ProgressDialog dialog = new ProgressDialog(DatabaseExampleActivity.this);
#Override
protected void onPreExecute()
{this.dialog.setMessage("Exporting to excel...");
this.dialog.show();}
#Override
protected Boolean doInBackground(String... params) {
ArrayList arList=null;
ArrayList al=null;
//File dbFile= new File(getDatabasePath("database_name").toString());
File dbFile=getDatabasePath("database_name");
String yes= dbFile.getAbsolutePath();
String inFilePath = Environment.getExternalStorageDirectory().toString()+"/excerDB.csv";
outFilePath = Environment.getExternalStorageDirectory().toString()+"/test.xls";
String thisLine;
int count=0;
try {
FileInputStream fis = new FileInputStream(inFilePath);
DataInputStream myInput = new DataInputStream(fis);
int i=0;
arList = new ArrayList();
while ((thisLine = myInput.readLine()) != null)
{
al = new ArrayList();
String strar[] = thisLine.split(",");
for(int j=0;j<strar.length;j++)
{
al.add(strar[j]);
}
arList.add(al);
System.out.println();
i++;
}} catch (Exception e) {
System.out.println("shit");
}
try
{
HSSFWorkbook hwb = new HSSFWorkbook();
HSSFSheet sheet = hwb.createSheet("new sheet");
for(int k=0;k<arList.size();k++)
{
ArrayList ardata = (ArrayList)arList.get(k);
HSSFRow row = sheet.createRow((short) 0+k);
for(int p=0;p<ardata.size();p++)
{
HSSFCell cell = row.createCell((short) p);
String data = ardata.get(p).toString();
if(data.startsWith("=")){
cell.setCellType(Cell.CELL_TYPE_STRING);
data=data.replaceAll("\"", "");
data=data.replaceAll("=", "");
cell.setCellValue(data);
}else if(data.startsWith("\"")){
data=data.replaceAll("\"", "");
cell.setCellType(Cell.CELL_TYPE_STRING);
cell.setCellValue(data);
}else{
data=data.replaceAll("\"", "");
cell.setCellType(Cell.CELL_TYPE_NUMERIC);
cell.setCellValue(data);
}
//*/
// cell.setCellValue(ardata.get(p).toString());
}
System.out.println();
}
FileOutputStream fileOut = new FileOutputStream(outFilePath);
hwb.write(fileOut);
fileOut.close();
System.out.println("Your excel file has been generated");
} catch ( Exception ex ) {
ex.printStackTrace();
} //main method ends
return true;
}
protected void onPostExecute(final Boolean success)
{
if (this.dialog.isShowing())
{
this.dialog.dismiss();
}
if (success)
{
Toast.makeText(DatabaseExampleActivity.this, "file is built!", Toast.LENGTH_LONG).show();
}
else
{
Toast.makeText(DatabaseExampleActivity.this, "file fail to build", Toast.LENGTH_SHORT).show();
}
}
}

I know this question is a little old but it provided me with the answer to the same question. I've cleaned up the code a little and done away with the need to write a csv file altogether by getting my database helper class to return me an ArrayList. Still using Apache POI though.
File folder =new File(Environment.getExternalStorageDirectory()+APP_FILES_PATH);
if(!folder.exists())
{
folder.mkdir();
}
DatabaseHelper dbHelper = DatabaseHelper.getInstance(context);
ArrayList<String[]> exts = dbHelper.getExtinguisherArray(1);
HSSFWorkbook hwb = new HSSFWorkbook();
HSSFSheet sheet = hwb.createSheet("extinguishers");
for(int x = 0; x < exts.size(); x++)
{
String[] arr = exts.get(x);
HSSFRow row = sheet.createRow(x);
for(int i = 0; i< arr.length; i++)
{
HSSFCell cell = row.createCell(i);
String data = arr[i];
cell.setCellValue(data);
}
}
FileOutputStream fileOut = new FileOutputStream(Environment.getExternalStorageDirectory()+APP_FILES_PATH+"file.xls");
hwb.write(fileOut);
fileOut.close();

Export Android SqliteDb to CSV format
You need to do these step...
add this jar file opencsv-1.7.jar http://www.java2s.com/Code/Jar/o/Downloadopencsv17jar.htm
And then use this code
public class ExportDatabaseToCSV{
Context context;
public ExportDatabaseToCSV(Context context) {
this.context=context;
}
public void exportDataBaseIntoCSV(){
CredentialDb db = new CredentialDb(context);//here CredentialDb is my database. you can create your db object.
File exportDir = new File(Environment.getExternalStorageDirectory(), "");
if (!exportDir.exists())
{
exportDir.mkdirs();
}
File file = new File(exportDir, "csvfilename.csv");
try
{
file.createNewFile();
CSVWriter csvWrite = new CSVWriter(new FileWriter(file));
SQLiteDatabase sql_db = db.getReadableDatabase();//here create a method ,and return SQLiteDatabaseObject.getReadableDatabase();
Cursor curCSV = sql_db.rawQuery("SELECT * FROM "+CredentialDb.TABLE_NAME,null);
csvWrite.writeNext(curCSV.getColumnNames());
while(curCSV.moveToNext())
{
//Which column you want to export you can add over here...
String arrStr[] ={curCSV.getString(0),curCSV.getString(1), curCSV.getString(2)};
csvWrite.writeNext(arrStr);
}
csvWrite.close();
curCSV.close();
}
catch(Exception sqlEx)
{
Log.e("Error:", sqlEx.getMessage(), sqlEx);
}
}
}

In addition to #user2324120's answer, and as we're in Android, you can directly add the libs to gradle (and therefore you don't need to download the jars) :
compile 'com.opencsv:opencsv:3.7'
compile 'org.apache.poi:poi:3.14'
I also did it a different way, a way more customisable one (and without useless CSV transition). Here it is, with a few comments :
public static Pair<Boolean, String> exportToXLS(Context context, boolean byAuthor) {
try {
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet(context.getString(R.string.sheet_name)); // Good for localization
initSheetColumns(context, workbook, sheet, byAuthor);
addBooksToSheet(sheet, byAuthor);
setColumsWidth(sheet);
OutputStream outputStream = new FileOutputStream(new File(Methods.getDownloadsDirectory(), byAuthor ? context.getString(R.string.mylibrary_by_author_xls) : context.getString(R.string.mylibrary_xls)).getAbsolutePath());
workbook.write(outputStream);
outputStream.flush();
outputStream.close();
return new Pair<>(true, context.getString(R.string.database_saved));
} catch (Exception e) {
e.printStackTrace();
return new Pair<>(false, context.getString(R.string.an_error_has_occured_during_xls_file_creation));
}
}
private static void initSheetColumns(Context context, HSSFWorkbook workbook, HSSFSheet sheet, boolean byAuthor) {
HSSFRow row = sheet.createRow(0);
HSSFCell cell = row.createCell(0);
cell.setCellValue(byAuthor ? context.getString(R.string.db_author) : context.getString(R.string.db_title));
cell = row.createCell(1);
cell.setCellValue(byAuthor ? context.getString(R.string.db_title) : context.getString(R.string.db_author));
cell = row.createCell(2);
cell.setCellValue(context.getString(R.string.db_publisheddate));
/*
etc.
*/
boldHeaders(workbook, row);
}
private static void boldHeaders(HSSFWorkbook workbook, HSSFRow row) {
HSSFCellStyle style = workbook.createCellStyle();
/* Do your own style
...
*/
for (int i = 0; i < 8; i++) {
row.getCell(i).setCellStyle(style);
}
}
// Allow data personalisation and localisation if needed
private static void addBooksToSheet(HSSFSheet sheet, boolean byAuthor) {
int i = 1;
List<Book> books = Book.listAll(Book.class); // I use Sugar library here, if you're not just make a simple db query to get your objects
Collections.sort(books, byAuthor ? Book.bookAuthorComparator : Book.bookNameComparator);
for (Book book : books) {
HSSFRow row = sheet.createRow(i);
HSSFCell cell = row.createCell(0);
cell.setCellValue(byAuthor ? getBookValue(book, true) : book.getTitle());
cell = row.createCell(1);
cell.setCellValue(byAuthor ? book.getTitle() : getBookValue(book, false));
cell = row.createCell(2);
cell.setCellValue(book.getPublishedDate());
/*
etc.
*/
i++;
}
}
private static void setColumsWidth(HSSFSheet sheet) {
for (int i = 0; i < 8; i++) {
sheet.setColumnWidth(i, 255 * getMaxNumCharacters(sheet, i)); // Autosize not working on Android
}
}
// My method to get the max num char, if it can hekp
public static int getMaxNumCharacters(Sheet sheet, int column) {
int max = 0;
for (int rowIndex = 0; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
Row row = sheet.getRow(rowIndex);
if (row == null) {
continue;
}
Cell cell = row.getCell(column);
if (cell != null) {
int nb = cell.getStringCellValue().length();
if (nb > max) {
max = nb;
}
}
}
max = (int) (max * 1.1);
if (max > 255) {
return 255; // max 255 char for width
}
return max;
}
Hope it helps!

android delete item from list [duplicate]

This question already has answers here:
Android expandable list need help to delete item
(2 answers)
Closed 8 years ago.
public class DeleteActivity extends ExpandableListActivity {
private RingtoneAdapter expListAdapter;
int myProgress = 0;
List<String> items = new ArrayList<String>();
final Context myApp = this;
// private static final String DIRECTORY = "/system/media/audio/ringtones/";
private static final String DIRECTORY = "/sdcard/download/";
private MediaPlayer mp = new MediaPlayer();
List<String> Ringtones = new ArrayList<String>();
ArrayAdapter<String> adapter;
TextView tv, empty;
ExpandableListView exlv1;
// ListView lv1;
Boolean hasErrors = false;
int currentPosition = 0;
private static final String LOG_TAG = "MobiIntheMorning";
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
refreshList();
Toast.makeText(this, "hello this is delete called", Toast.LENGTH_LONG).show();
Ringtones.remove(DIRECTORY+Ringtones.get(1));//THIS DOSE NOT GIVING ANY AFFECT
refreshList();
Intent i = new Intent(DeleteActivity.this, FindFilesByType.class);
startActivity(i);
}
public void refreshList() {
File ringtones_directory = new File(DIRECTORY);
if (!ringtones_directory.exists()) {
AlertDialog.Builder ad = new AlertDialog.Builder(
DeleteActivity.this);
ad.setTitle("Directory Not Found");
ad.setMessage("Sorry! The ringtones directory doesn't exist.");
ad.setPositiveButton("OK", null);
ad.show();
hasErrors = true;
}
if ( !ringtones_directory.canRead()) {
AlertDialog.Builder ad = new AlertDialog.Builder(
DeleteActivity.this);
ad.setTitle("Permissions");
ad.setMessage("Sorry! You don't have permission to list the files in that folder");
ad.setPositiveButton("OK", null);
ad.show();
hasErrors = true;
} else {
Ringtones = FindFiles(false);
if (Ringtones.size() < 1) {
AlertDialog.Builder ad = new AlertDialog.Builder(
DeleteActivity.this);
ad.setTitle("Permissions");
ad.setMessage("Sorry! No ringtones exists in " + DIRECTORY
+ ".");
ad.setPositiveButton("OK", null);
ad.show();
Log.e(LOG_TAG, "No ringtones were found.");
hasErrors = true;
}
}
try {
if ( !hasErrors) {
ArrayAdapter<String> adapter = new ArrayAdapter<String>(
DeleteActivity.this, android.R.layout.test_list_item,
Ringtones);
ArrayList<String> GrouppList = new ArrayList<String>();
GrouppList.addAll(Ringtones);
ArrayList<ArrayList<Color>> colors = new ArrayList<ArrayList<Color>>();
for (int i = 0; i <= Ringtones.size(); i++) {
ArrayList<Color> color = new ArrayList<Color>();
color = new ArrayList<Color>();
color.add(new Color("", "", true));
colors.add(color);
}
expListAdapter = new RingtoneAdapter(this, GrouppList, colors);
Toast.makeText(this, GlobalVariable.getstrEmail(),
Toast.LENGTH_LONG).show();
Ringtones.remove(0);
// setListAdapter(expListAdapter);
exlv1 = (ExpandableListView) findViewById(R.id.expandableListView1);
this.exlv1.setAdapter(this.expListAdapter);
}
this.exlv1.setOnGroupExpandListener(new OnGroupExpandListener() {
#Override
public void onGroupExpand(int arg0) {
Toast.makeText(DeleteActivity.this, "hello" + arg0,
Toast.LENGTH_LONG).show();
GlobalVariable.SetcurrentPosition(arg0);
GlobalVariable.SetstrEmail(DIRECTORY + Ringtones.get(arg0));
}
});
} catch (Exception e) {
Toast.makeText(this, "Error " + e.toString(), Toast.LENGTH_LONG)
.show();
Log.i(LOG_TAG, e.toString());
}
}
private List<String> FindFiles(Boolean fullPath) {
final List<String> tFileList = new ArrayList<String>();
Resources resources = getResources();
// array of valid audio file extensions
String[] audioTypes = resources.getStringArray(R.array.audio);
FilenameFilter[] filter = new FilenameFilter[audioTypes.length];
int i = 0;
for (final String type : audioTypes) {
filter[i] = new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.endsWith("." + type);
}
};
i++;
}
FileUtils fileUtils = new FileUtils();
File[] allMatchingFiles = fileUtils.listFilesAsArray(
new File(DIRECTORY), filter, -1);
for (File f : allMatchingFiles) {
if (fullPath) {
tFileList.add(f.getAbsolutePath());
} else {
tFileList.add(f.getName());
}
}
return tFileList;
} // find fil
#SuppressWarnings("unchecked")
public List<String> loadArray(String filename) {
try {
FileInputStream fis = new FileInputStream(filename);
GZIPInputStream gzis = new GZIPInputStream(fis);
ObjectInputStream in = new ObjectInputStream(gzis);
List<String> read_field = (List<String>) in.readObject();
in.close();
return read_field;
} catch (Exception e) {
e.getStackTrace();
}
return null;
}
public Collection<File> listFiles(File directory, FilenameFilter[] filter,
int recurse) {
Vector<File> files = new Vector<File>();
File[] entries = directory.listFiles();
if (entries != null) {
for (File entry : entries) {
for (FilenameFilter filefilter : filter) {
if (filter == null
|| filefilter.accept(directory, entry.getName())) {
files.add(entry);
Log.v(LOG_TAG, "Added: " + entry.getName());
}
}
if ((recurse <= -1) || (recurse > 0 && entry.isDirectory()))
files.addAll(listFiles(entry, filter, recurse - 1));
}
}
return files;
}
public class FileUtils {
public void saveArray(String filename, List<String> output_field) {
try {
FileOutputStream fos = new FileOutputStream(filename);
GZIPOutputStream gzos = new GZIPOutputStream(fos);
ObjectOutputStream out = new ObjectOutputStream(gzos);
out.writeObject(output_field);
out.flush();
out.close();
} catch (IOException e) {
e.getStackTrace();
}
}
public File[] listFilesAsArray(File directory, FilenameFilter[] filter,
int recurse) {
Collection<File> files = listFiles(directory, filter, recurse);
File[] arr = new File[files.size()];
return files.toArray(arr);
}
}
}
I've done some code that code fetches .mp3 files from the sdcard and displays it to me
now i am trying to delete selected item from it using
Ringtones.remove(DIRECTORY+Ringtones.get(1));
that is it should delete my first item from the list but it doesn't works for me
what is wrong i ma doing into this?
I am not able to find any silly mistakes I made here; Ringtones.remove("test.mp3"); and Ringtones.remove(1.mp3); both I've also tried.

Why are you doing
DIRECTORY + Ringtones.get(1)
Ringtones is a List so you want to be doing something like
Ringtones.remove(1);
or
Ringtones.remove(aRintoneString)
what you effectively doing here is getting the first element and adding a other string which gives you a NEW third string that doesn't exist in Ringtones

Hi Call notifyDataSetChanged() on your Adapter after removing the item from the List.
It will refresh your List and you will get updated items in your list.