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How to remove an item in an SQL database? [duplicate]

This question already has answers here:
Deleting Row in SQLite in Android
(18 answers)
Closed 6 years ago.
I know there are lots of threads with more or less same topic but none of them covers my situation:
I have delete button that delete one item in a listView but when you close the app and reopen it the items reappears. I don't know how to fix this .
DatabaseHelper.java
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "todo.db";
public static final int DATABASE_VERSION = 1;
public static final String ITEMS_TABLE = "items";
private static DatabaseHelper instance = null;
public static DatabaseHelper getInstance(Context context) {
if(instance == null) {
instance = new DatabaseHelper(context);
}
return instance;
}
private DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
String createQuery = "CREATE TABLE " + ITEMS_TABLE + " (" +
"_id INTEGER PRIMARY KEY AUTOINCREMENT," +
"description TEXT NOT NULL, " +
"completed INTEGER NOT NULL DEFAULT 0)";
db.execSQL(createQuery);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
The button works fine but it does not delete permently I don't know if it is the code or if it is where I am placing it in my MainActivity if someone would please tell that would much appreciated.
MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final String LOG_TAG = "ToDoApp";
private ToDoListManager listManager;
private ToDoItemAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView todoList = (ListView) findViewById(R.id.todo_list);
listManager = new ToDoListManager(getApplicationContext());
adapter = new ToDoItemAdapter(
this,
listManager.getList()
);
todoList.setAdapter(adapter);
ImageButton addButton = (ImageButton) findViewById(R.id.add_item);
addButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onAddButtonClick();
}
});
}
#Override
protected void onPause() {
super.onPause();
}
private void onAddButtonClick() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(R.string.add_item);
final EditText input = new EditText(this);
input.setInputType(InputType.TYPE_CLASS_TEXT);
builder.setView(input);
builder.setPositiveButton(
R.string.ok,
new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
ToDoItem item = new ToDoItem(
input.getText().toString(),
false
);
listManager.addItem(item);
adapter.swapItems(listManager.getList());
}
});
builder.setNegativeButton(
R.string.cancel,
new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
}
private class ToDoItemAdapter extends ArrayAdapter<ToDoItem> {
private Context context;
private List<ToDoItem> items;
private LayoutInflater inflater;
public ToDoItemAdapter(
Context context,
List<ToDoItem> items
) {
super(context, -1, items);
this.context = context;
this.items = items;
this.inflater = LayoutInflater.from(context);
}
public void swapItems(List<ToDoItem> items) {
this.items = items;
notifyDataSetChanged();
}
#Override
public int getCount() {
return items.size();
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ItemViewHolder holder;
if(convertView == null) {
convertView = inflater.inflate(R.layout.to_do_item_layout, parent, false);
holder = new ItemViewHolder();
holder.itemDescription = (TextView) convertView.findViewById(R.id.item);
holder.itemState = (CheckBox) convertView.findViewById(R.id.checkBox);
convertView.setTag(holder);
}else {
holder = (ItemViewHolder) convertView.getTag();
}
holder.itemDescription.setText(items.get(position).getDescription());
holder.itemState.setChecked(items.get(position).isComplete());
holder.itemState.setTag(items.get(position));
convertView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ToDoItem item = (ToDoItem) holder.itemState.getTag();
item.toggleComplete();
listManager.updateItem(item);
notifyDataSetChanged();
}
});
ImageButton deleteButton = (ImageButton) convertView.findViewById(R.id.delete_Button);
deleteButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
items.remove(items.get(position));
notifyDataSetChanged();
}
});
holder.itemState.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
ToDoItem item = (ToDoItem) holder.itemState.getTag();
item.toggleComplete();
listManager.updateItem(item);
notifyDataSetChanged();
}
});
return convertView;
}
}
public static class ItemViewHolder{
public TextView itemDescription;
public CheckBox itemState;
}
}
ToDoListManager.java
public class ToDoListManager {
private DatabaseHelper dbHelper;
public ToDoListManager(Context context) {
dbHelper = DatabaseHelper.getInstance(context);
}
public List<ToDoItem> getList() {
SQLiteDatabase db = dbHelper.getReadableDatabase();
Cursor cursor = db.rawQuery(
"SELECT * FROM " + DatabaseHelper.ITEMS_TABLE,
null
);
List<ToDoItem> items = new ArrayList<>();
if(cursor.moveToFirst()) {
while(!cursor.isAfterLast()) {
ToDoItem item = new ToDoItem(
cursor.getString(cursor.getColumnIndex("description")),
cursor.getInt(cursor.getColumnIndex("completed")) != 0,
cursor.getLong(cursor.getColumnIndex("_id"))
);
items.add(item);
cursor.moveToNext();
}
}
cursor.close();
return items;
}
public void addItem(ToDoItem item) {
ContentValues newItem = new ContentValues();
newItem.put("description", item.getDescription());
newItem.put("completed", item.isComplete());
SQLiteDatabase db = dbHelper.getWritableDatabase();
db.insert(DatabaseHelper.ITEMS_TABLE, null, newItem);
}
public void updateItem(ToDoItem item) {
ContentValues editItem = new ContentValues();
editItem.put("description", item.getDescription());
editItem.put("completed", item.isComplete());
SQLiteDatabase db = dbHelper.getWritableDatabase();
String[] args = new String[] { String.valueOf(item.getId()) };
db.update(DatabaseHelper.ITEMS_TABLE, editItem, "_id=?", args);
}
}
ToDoItem.java
public class ToDoItem {
private String description;
private boolean isComplete;
private long id;
public ToDoItem(String description, boolean isComplete) {
this(description, isComplete, -1);
}
public ToDoItem(String description,boolean isComplete,long id) {
this.description = description;
this.isComplete = isComplete;
this.id = id;
}
public String getDescription() {
return description;
}
public boolean isComplete() {
return isComplete;
}
public void toggleComplete() {
isComplete = !isComplete;
}
public long getId() {return id;}
#Override
public String toString() {
return getDescription();
}
}

you just remove items in your adapter class that causes the item delete from the current listView. but you have not any function in your ToDoListManager.java that remove items from your database. deleting from a listView does not affect to your database items.
you can add this function to your ToDoListManager.java class
public void deleteItem(long itemId) {
SQLiteDatabase db = dbHelper.getWritableDatabase();
db.delete(DatabaseHelper.ITEMS_TABLE, "_id = ?",
new String[] { String.valueOf(itemId) });
}
and call it from your delete button's onClick, like this
ImageButton deleteButton = (ImageButton) convertView.findViewById(R.id.delete_Button);
deleteButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
long itemId = items.get(position).getId();
items.remove(items.get(position));
listManager.deleteItem(itemId);
notifyDataSetChanged();
}
});

Since you are fetching the data from data base and displaying it in listview,you need to delete the row from database too. make a method in you database adapter that looks some thing like this:
public boolean deleteItem(Long id) {
return Db.delete(DATABASE_TABLE,"_id="+id,null) > 0;
}
then on list view item delete,simply call this method and pass the row id as argument.

Passing data in from list to detail view in Android

I have a list view populated threw an SQlitedatabase but I need to pass to a detail activity from the list view. The problem is in passing the details from the listview activity to the detail activity because when I click the detail activity it gives me blank edit texts
Here is my listview activity:
public class consulter_note extends Activity implements AdapterView.OnItemClickListener{
ListView list;
SQLiteDatabase sqLiteDatabase;
DataBaseOperationstwo dataBaseOperationstwo;
Cursor cursor;
ListDataAdapter listDataAdapter;
String titre,objet;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_consulter_note);
list = (ListView) findViewById(R.id.listView);
listDataAdapter = new ListDataAdapter(getApplicationContext(),R.layout.notelist_row);
list.setAdapter(listDataAdapter);
list.setOnItemClickListener(this);
dataBaseOperationstwo = new DataBaseOperationstwo(getApplicationContext());
sqLiteDatabase = dataBaseOperationstwo.getReadableDatabase();
cursor = dataBaseOperationstwo.getInformations(sqLiteDatabase);
if (cursor.moveToFirst())
{
do
{
titre = cursor.getString(0);
objet = cursor.getString(1);
DataProvider dataProvider = new DataProvider(titre,objet);
listDataAdapter.add(dataProvider);
}while (cursor.moveToNext());
}
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(this, note_details.class);
startActivity(intent);
intent.putExtra("titre", titre);
intent.putExtra("objet", objet);
}
}
And here is my array adapter:
public class ListDataAdapter extends ArrayAdapter{
List list = new ArrayList();
public ListDataAdapter(Context context, int resource) {
super(context, resource);
}
static class LayoutHandler
{
TextView TITRE,OBJET;
}
#Override
public void add(Object object) {
super.add(object);
list.add(object);
}
#Override
public int getCount() {
return list.size();
}
#Override
public Object getItem(int position) {
return list.get(position);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
LayoutHandler layoutHandler;
if (row == null)
{
LayoutInflater layoutInflater = (LayoutInflater) this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = layoutInflater.inflate(R.layout.notelist_row,parent,false);
layoutHandler = new LayoutHandler();
layoutHandler.TITRE = (TextView) row.findViewById(R.id.titredemo);
layoutHandler.OBJET = (TextView) row.findViewById(R.id.objetdemo);
row.setTag(layoutHandler);
}
else
{
layoutHandler = (LayoutHandler) row.getTag();
}
DataProvider dataProvider = (DataProvider) this.getItem(position);
layoutHandler.TITRE.setText(dataProvider.getTitre());
layoutHandler.OBJET.setText(dataProvider.getObjet());
return row;
}
}
The data provider class used in the array adapter:
public class DataProvider {
private String titre,objet;
public DataProvider(String titre,String objet)
{
this.titre = titre;
this.objet = objet;
}
public String getTitre() {
return titre;
}
public void setTitre(String titre) {
this.titre = titre;
}
public String getObjet() {
return objet;
}
public void setObjet(String objet) {
this.objet = objet;
}
}
And finally my details activity. I'm only interested in the intent part; the rest has nothing to do with my problem:
public class note_details extends Activity {
ImageButton Del;
EditText PASSTITRE,USEROBJET;
String Passtitre,Userobjet;
DataBaseOperationstwo DOP;
Context CTX = this;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent =getIntent();
if(intent != null)
{
String objet = intent.getStringExtra("objet");
String titre= intent.getStringExtra("titre");
PASSTITRE.setText(objet);
USEROBJET.setText(objet);
}
setContentView(R.layout.activity_note_details);
Del = (ImageButton) findViewById(R.id.suppnote);
PASSTITRE = (EditText) findViewById(R.id.titree);
USEROBJET = (EditText) findViewById(R.id.objett);
Del.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Passtitre = PASSTITRE.getText().toString();
Userobjet = USEROBJET.getText().toString();
DOP = new DataBaseOperationstwo(CTX);
DOP.deleteNote(DOP,Passtitre,Userobjet);
Toast.makeText(getBaseContext(),"note supprimé",Toast.LENGTH_LONG).show();
finish();
}
});
}
public void liste(View v)
{
Intent i = new Intent(this, consulter_note.class);
startActivity(i);
}
public void supprimer(View v)
{
}
}
My logcat doesn’t show any errors but the details activity shows with empty edittexts.

You should first add extras to the Intent and then fire it:
Intent intent = new Intent(this, note_details.class);
intent.putExtra("titre", titre);
intent.putExtra("objet", objet);
startActivity(intent);
Another thing worth mentioning is that you should avoid doing DB queries on the main thread, as it will slow down your app. Use Loaders, or just run queries on worker threads.

How to update row that is clicked?

After a long time I figured out that changing argument from 0 to different number allows me to update row with corresponding id to this number:
private void saveItToDB() {
dba.open();
dba.updateDiaryEntry(((TextView) editText).getText().toString(), 2);
dba.close();
((TextView) editText).setText("");
}
In above code I changed 0 to 2 and I was able to update content of row no 2. Here is full class code:
class EditListItemDialog extends Dialog implements View.OnClickListener {
MyDB dba;
private View editText;
private DiaryAdapter adapter;
private SQLiteDatabase db;
public EditListItemDialog(Context context) {
super(context);
dba = new MyDB(context);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.edit_text_dialog);//here is your xml with EditText and 'Ok' and 'Cancel' buttons
View btnOk = findViewById(R.id.button_ok);
editText = findViewById(R.id.edit_text);
btnOk.setOnClickListener(this);
dba.open();
}
private List<String> fragment_monday;
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//Position is the number of the item clicked
//You can use your adapter to modify the item
adapter.getItem(position); //Will return the clicked item
}
public EditListItemDialog(Context context, DiaryAdapter adapter, int position) {
super(context);
this.fragment_monday = new ArrayList<String>();
this.adapter = adapter;
dba = new MyDB(context);
}
#Override
public void onClick(View v) {
fragment_monday.add(((TextView) v).getText().toString());//here is your updated(or not updated) text
dismiss();
try {
saveItToDB();
} catch (Exception e) {
e.printStackTrace();
}
}
private void saveItToDB() {
dba.open();
dba.updateDiaryEntry(((TextView) editText).getText().toString(), 2);
dba.close();
((TextView) editText).setText("");
}
}
Now, what do I need to do in order to tell it that I want to update row that is clicked, not row number 2? Any help would be appreciated.
Here is MyDB code:
public class MyDB {
private static final String TABLE_NAME = null;
private static final String KEY_ID = null;
private SQLiteDatabase db;
private final Context context;
private final MyDBhelper dbhelper;
// Initializes MyDBHelper instance
public MyDB(Context c){
context = c;
dbhelper = new MyDBhelper(context, Constants.DATABASE_NAME, null,
Constants.DATABASE_VERSION);
}
// Closes the database connection
public void close()
{
db.close();
}
// Initializes a SQLiteDatabase instance using MyDBhelper
public void open() throws SQLiteException
{
try {
db = dbhelper.getWritableDatabase();
} catch(SQLiteException ex) {
Log.v("Open database exception caught", ex.getMessage());
db = dbhelper.getReadableDatabase();
}
}
// updates a diary entry (existing row)
public boolean updateDiaryEntry(String title, long rowId)
{
ContentValues newValue = new ContentValues();
newValue.put(Constants.TITLE_NAME, title);
return db.update(Constants.TABLE_NAME, newValue, Constants.KEY_ID + "=" + rowId, null)>0;
}
// Reads the diary entries from database, saves them in a Cursor class and returns it from the method
public Cursor getdiaries()
{
Cursor c = db.query(Constants.TABLE_NAME, null, null,
null, null, null, null);
return c;
}
}
Here is the Adapter:
public class Monday extends ListActivity {
private SQLiteDatabase db;
private static final int MyMenu = 0;
MyDB dba;
DiaryAdapter myAdapter;
private class MyDiary{
public MyDiary(String t, String c){
title=t;
content=c;
}
public String title;
public String content;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
dba = new MyDB(this);
dba.open();
setContentView(R.layout.fragment_monday);
super.onCreate(savedInstanceState);
myAdapter = new DiaryAdapter(this);
this.setListAdapter(myAdapter);
}
public class DiaryAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private ArrayList<MyDiary> fragment_monday;
public DiaryAdapter(Context context) {
mInflater = LayoutInflater.from(context);
fragment_monday = new ArrayList<MyDiary>();
getdata();
ListView list = getListView();
list.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
new EditListItemDialog(Monday.this, null, position).show();
return true;
}
});
}
public void getdata(){
Cursor c = dba.getdiaries();
startManagingCursor(c);
if(c.moveToFirst()){
do{
String title =
c.getString(c.getColumnIndex(Constants.TITLE_NAME));
String content =
c.getString(c.getColumnIndex(Constants.CONTENT_NAME));
MyDiary temp = new MyDiary(title,content);
fragment_monday.add(temp);
} while(c.moveToNext());
}
}
#Override
public int getCount() {return fragment_monday.size();}
public MyDiary getItem(int i) {return fragment_monday.get(i);}
public long getItemId(int i) {return i;}
public View getView(int arg0, View arg1, ViewGroup arg2) {
final ViewHolder holder;
View v = arg1;
if ((v == null) || (v.getTag() == null)) {
v = mInflater.inflate(R.layout.diaryrow, null);
holder = new ViewHolder();
holder.mTitle = (TextView)v.findViewById(R.id.name);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
holder.mdiary = getItem(arg0);
holder.mTitle.setText(holder.mdiary.title);
v.setTag(holder);
return v;
}
public class ViewHolder {
MyDiary mdiary;
TextView mTitle;
}
}
/** Called when the user clicks the Edit button */
public void visitDiary(View view) {
Intent intent = new Intent(this, Diary.class);
startActivity(intent);
}
/** Called when the user clicks the back button */
public void visitSchedule(View view) {
Intent intent = new Intent(this, DisplayScheduleScreen.class);
startActivity(intent);
}
}

Implement getItemId(int position) in your adapter. In your onListItemClick method, call this method with the given position.
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
long itemId = adapter.getItemId(position);
saveItToDB(itemId);
}
private void saveItToDB(long itemId) {
String text = editText.getText().toString();
editText.setText("");
dba.open();
dba.updateDiaryEntry(text, itemId);
dba.close();
}

Searching particular record from custom ListView

I have stored three values into the database and i want to make search on button click, after clicking on search button it will be move on search screen and there is only search box is presented.
DatabaseHelper.java
public class DatabaseHelper extends SQLiteOpenHelper {
public static String DATABASENAME = "Aadhaar";
public static String PRODUCTTABLE = "Enrolled";
private ArrayList<CandidateModel> cartList = new ArrayList<CandidateModel>();
Context c;
public DatabaseHelper(Context context) {
super(context, DATABASENAME, null, 33);
c = context;
}
#Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE if not exists Enrolled(id INTEGER PRIMARY KEY AUTOINCREMENT,"
+ "_id"
+ " TEXT ,"
+ "FirstName"
+ " TEXT,"
+ "LastName"
+ " TEXT)");
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS" + PRODUCTTABLE);
onCreate(db);
}
public void addProduct(CandidateModel productitem) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("_id", productitem.idno);
contentValues.put("FirstName", productitem.productname);
contentValues.put("LastName", productitem.productprice);
db.insert("Enrolled", null, contentValues);
db.close();
}
// update
public void updateProduct(CandidateModel productList) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("FirstName", productList.productname);
contentValues.put("LastName", productList.productprice);
db.update("Enrolled", contentValues, "_id=" + productList.idno, null);
db.close();
}
public void emptyProduct() {
try {
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL("delete from Enrolled");
db.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void removeProduct(String productid, String pname, String pprice) {
try {
// SQLiteDatabase db = this.getWritableDatabase();
// db.execSQL("delete from producttable where productidno="
// + productid);
// db.close();
String[] args = { productid };
getWritableDatabase().delete("Enrolled", "_id=?", args);
} catch (Exception e) {
e.printStackTrace();
}
}
public ArrayList<CandidateModel> getProudcts() {
cartList.clear();
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery("select * from Enrolled", null);
if (cursor.getCount() != 0) {
if (cursor.moveToFirst()) {
do {
CandidateModel item = new CandidateModel();
item.idno = cursor.getString(cursor.getColumnIndex("_id"));
item.productname = cursor.getString(cursor
.getColumnIndex("FirstName"));
item.productprice = cursor.getString(cursor
.getColumnIndex("LastName"));
cartList.add(item);
} while (cursor.moveToNext());
}
}
cursor.close();
db.close();
return cartList;
}
}
Aadhar.java
public class Aadhar extends Activity implements OnClickListener {
private Button btn_add, btn_view, btn_search;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn_add = (Button) findViewById(R.id.btn_add);
btn_view = (Button) findViewById(R.id.btn_view);
btn_search = (Button) findViewById(R.id.btn_search);
btn_add.setOnClickListener(this);
btn_view.setOnClickListener(this);
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_add:
Intent addintent = new Intent(Aadhar.this, AddRecord.class);
startActivity(addintent);
break;
case R.id.btn_view:
Intent viewintent = new Intent(Aadhar.this, ViewRecord.class);
startActivity(viewintent);
break;
case R.id.btn_search:
Intent searchIntent = new Intent (Aadhar.this, SearchRecord.class);
startActivity(searchIntent);
default:
break;
}
}
}
SearchRecord.java
public class SearchRecord extends Activity implements OnClickListener {
String TAG = "SearchRecord";
private ListView lv;
// Button searchButton;
private EditText search;
CandidateModel cm;
DatabaseHelper db;
public ArrayList<CandidateModel> _candidatelist = new ArrayList<CandidateModel>();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_candidate);
Log.v(TAG, "Searching Candidates");
lv = (ListView) findViewById(R.id.search_listview);
search = (EditText) findViewById(R.id.edit_search);
Log.v(TAG, "Going to enter into TextWatcher");
lv.setTextFilterEnabled(true);
search.addTextChangedListener(new TextWatcher() {
public void afterTextChanged(Editable s) {
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
Log.v(TAG, "Entered into the Text Changed Method");
((Filterable) _candidatelist).getFilter().filter(s.toString());
Log.v(TAG, "Finished Filtering");
lv.setAdapter((android.widget.ListAdapter) _candidatelist);
}
});
}
CandidateModel.java
public class CandidateModel {
public String getFirstname() {
return fname;
}
public void setFirstname(String fname) {
this.fname = fname;
}
public String getLastname() {
return lname;
}
public void setLastname(String lname) {
this.lname = lname;
}
public String idno="", fname="", lname="";
public String getIdno() {
return idno;
}
public void setIdno(String idno) {
this.idno = idno;
}
}
ViewRecord.java
public class ViewRecord extends Activity {
private ListView listview;
// private EditText search;
String TAG = "ViewRecord";
TextView totalrecords;
DatabaseHelper db;
public ArrayList<CandidateModel> _candidatelist = new ArrayList<CandidateModel>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view_candidates);
totalrecords = (TextView) findViewById(R.id.totalrecords);
listview = (ListView) findViewById(R.id.listview);
}
#Override
protected void onResume() {
super.onResume();
_candidatelist.clear();
db = new DatabaseHelper(getApplicationContext());
db.getWritableDatabase();
ArrayList<CandidateModel> cand_list = db.getCandidates();
for (int i = 0; i < cand_list.size(); i++) {
String tidno = cand_list.get(i).getIdno();
System.out.println("tidno>>>>>" + tidno);
String tname = cand_list.get(i).getFirstname();
String tprice = cand_list.get(i).getLastname();
CandidateModel _CandidateModel = new CandidateModel();
_CandidateModel.setIdno(tidno);
_CandidateModel.setFirstname(tname);
_CandidateModel.setLastname(tprice);
_candidatelist.add(_CandidateModel);
}
totalrecords.setText("Total Enrollments :-" + _candidatelist.size());
listview.setAdapter(new ListAdapter(this));
db.close();
}
public class ListAdapter extends BaseAdapter {
LayoutInflater inflater;
ViewHolder viewHolder;
public ListAdapter(Context context) {
inflater = LayoutInflater.from(context);
}
#Override
public int getCount() {
return _candidatelist.size();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = inflater.inflate(R.layout.listview_row, null);
viewHolder = new ViewHolder();
viewHolder._id = (TextView) convertView
.findViewById(R.id.txtdisplaypname);
viewHolder.fname = (TextView) convertView
.findViewById(R.id.txtdisplaypprice);
viewHolder.lname = (TextView) convertView
.findViewById(R.id.txtdisplaypid);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder._id.setText(_candidatelist.get(position).getFirstname()
.trim());
viewHolder.fname.setText(_candidatelist.get(position).getLastname()
.trim());
viewHolder.lname.setText(_candidatelist.get(position).getIdno()
.trim());
final int temp = position;
(convertView.findViewById(R.id.btn_update))
.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
String _id = String.valueOf(_candidatelist
.get(temp).getIdno());
String _fname = _candidatelist.get(temp)
.getFirstname();
String _lname = _candidatelist.get(temp)
.getLastname();
Intent intent = new Intent(ViewRecord.this,
AddUpdateValues.class);
Bundle bundle = new Bundle();
bundle.putString("id", _id);
bundle.putString("name", _fname);
bundle.putString("price", _lname);
intent.putExtras(bundle);
startActivity(intent);
}
});
(convertView.findViewById(R.id.btn_delete))
.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
AlertDialog.Builder alertbox = new AlertDialog.Builder(
ViewRecord.this);
alertbox.setCancelable(true);
alertbox.setMessage("Are you sure you want to delete ?");
alertbox.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(
DialogInterface arg0, int arg1) {
Log.i(">>>TEMP>>>", temp + "");
Log.i(">>>getIdno>>>>>>",
_candidatelist.get(temp)
.getIdno().trim()
+ "");
System.out
.println(">>>getIdno>>>>>>"
+ _candidatelist
.get(temp)
.getIdno()
.trim());
db.removeCandidate(
_candidatelist.get(temp)
.getIdno().trim(),
"", "");
ViewRecord.this.onResume();
Toast.makeText(
getApplicationContext(),
"Record Deleted...",
Toast.LENGTH_SHORT).show();
}
});
alertbox.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(
DialogInterface arg0, int arg1) {
}
});
alertbox.show();
}
});
return convertView;
}
}
public class ViewHolder {
TextView _id;
TextView fname;
TextView lname;
}
}

ArrayList is not Filterable. It says in the Filterable documentation :
Defines a filterable behavior. A filterable class can have its data
constrained by a filter. Filterable classes are usually Adapter
implementations.
I think you should replace your ArrayList by an ArrayAdapter

Sort ListView alphabetically

I have a ListView which is populated by Objects from a JSON file.
I want to sort the ListView alphabetically based on this object: vidLocation.name
How am I able to perform that?
Here's my ListView class:
public class ProjectsList extends ListActivity implements OnItemClickListener, VideoLocationReceiver{
/** Called when the activity is first created. */
private VideoLocation[] videoLocations = null;
private VideoLocationAdapter videoLocationAdapter = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.projects_list);
doSync();
//storeSharedPrefs();
ListView lv = getListView();
lv.setOnItemClickListener(this);
videoLocationAdapter = new VideoLocationAdapter(ProjectsList.this,
R.layout.listitems,
new VideoLocation[0]);
lv.setAdapter(videoLocationAdapter);
//CREATE VideoLocation[] from Database!
JsonDB dbhelper = new JsonDB(ProjectsList.this);
SQLiteDatabase db = dbhelper.getWritableDatabase();
db.beginTransaction();
videoLocations = dbhelper.getVideoLocations(db);
db.setTransactionSuccessful();//end transaction
db.endTransaction();
db.close();
}
#Override
public void onResume(){
super.onResume();
DBSync.setVideoLocationReceiver(ProjectsList.this);
}
#Override
public void onPause(){
super.onResume();
DBSync.setVideoLocationReceiver(null);
}
#Override
public void onItemClick(AdapterView<?> l, View v, int position, long id) {
Intent listIntent = new Intent(this, ProjectDetailsActivity.class);
VideoLocation vidLocation = videoLocations[position];
listIntent.putExtra("documentary_video_url",vidLocation.documentary_video_url);
listIntent.putExtra("spendino.de.ProjectDetail.position",position);
startActivity(listIntent);
}
protected void storeSharedPrefs() {
final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
if (prefs.getBoolean("first-time", true)) {
doSync();
prefs.edit().putBoolean("first-time", false).commit(); // record the fact that the app has been started at least once
}
}
void doSync() {
Intent serviceIntent = new Intent(this, DBSync.class);
startService(serviceIntent);
}
public class VideoLocationAdapter extends ArrayAdapter<VideoLocation> {
public ImageLoader imageLoader;
ImageLoader loader = null;
public VideoLocationAdapter(Context context, int resource, VideoLocation[] vidLocs) {
super(context, resource, vidLocs);
ProjectsList.this.videoLocations = vidLocs;
loader = new ImageLoader(context);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if(convertView == null){
convertView = ProjectsList.this.getLayoutInflater().inflate(R.layout.listitems, null, true);
}
VideoLocation vidLocation = videoLocations[position];
ImageView v = (ImageView)convertView.findViewById(R.id.image);
String url = vidLocation.documentary_thumbnail_url;
v.setTag(url);
loader.DisplayImage(url, ProjectsList.this, v);
TextView titleView = (TextView)convertView.findViewById(R.id.txt_title);
titleView.setText(vidLocation.name);
return convertView;
}
#Override
public int getCount(){
return videoLocations==null?0:videoLocations.length;
}
#Override
public VideoLocation getItem(int position){
return videoLocations[position];
}
#Override
public boolean hasStableIds(){
return true;
}
#Override
public boolean isEnabled(int position){
return true;
}
#Override
public long getItemId(int position){
return videoLocations[position].id;
}
public void setVideoLocationData(VideoLocation[] newData){
ProjectsList.this.videoLocations = newData;
VideoLocationAdapter.this.notifyDataSetChanged();
}
}
#Override
public void receivedVideoLocationData(VideoLocation[] vidLocs) {
final VideoLocation[] locs = vidLocs;
if (vidLocs==null) {
runOnUiThread(new Runnable() {
#Override
public void run() {
//show popup and inform about missing network
}
});
}else{
runOnUiThread(new Runnable() {
#Override
public void run() {
videoLocationAdapter.setVideoLocationData(locs);
Log.d("ProjectsList", "updating video locations...");
}
});
}
}
}

Have you set DEFAULT_SORT_ORDER in your query? If not, by doing so you can easily have it list alphabetically.

Use Predefined sorting technique

I see that you are fetching your data from DB. In sqllite query you can give the sort order.
I couldnt find the line here where you are querying db. Trying something like this
public Cursor fetchRow(String tableName, String[] columnslist,
String condition) throws SQLException {
Log.i("DB Fetch arg ", condition);
Cursor mCursor = mDb.query(true, tableName, columnslist, condition,
null, null, null, "_id" + " DESC",null);
if (mCursor != null) {
Log.i("DB", "NOT NULL "+mCursor.getCount());
mCursor.moveToFirst();
}
return mCursor;
}