Can't delete Database item SQLite Android

Can't delete Database item SQLite Android - android

I've been going round in circles with this for days and I can't get my head around what's wrong.
With the following code, when you press the "yes" button to delete the item you touched, it shows everything and appears to do everything but the item is not removed from the list.
Activity class:
package com1032.em00224.knit;
import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.view.KeyEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class NoteActivity extends Activity {
private ListView list;
DatabaseHandler db;
int id_To_Update = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_note);
db = new DatabaseHandler(this);
ArrayList array_list = db.getAllNotes();
ArrayAdapter arrayAdapter =
new ArrayAdapter(this,android.R.layout.simple_list_item_1, array_list);
//adding it to the list view.
list = (ListView)findViewById(R.id.listView1);
list.setAdapter(arrayAdapter);
list.setOnItemClickListener(new OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> parent, View arg1, final int position,
long arg3) {
// TODO Auto-generated method stub
AlertDialog.Builder adb = new AlertDialog.Builder(NoteActivity.this);
adb.setTitle("Delete Note?");
adb.setMessage(R.string.deleteNote);
adb.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
db.deleteNote(position + 1);
arrayAdapter.notifyDataSetChanged();
Toast.makeText(getApplicationContext(), "Note Deleted", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getApplicationContext(), com1032.em00224.knit.NoteActivity.class);
startActivity(intent);
}
});
adb.setNegativeButton(R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
adb.show();
}
});
}
And the Database helper:
package com1032.em00224.knit;
import java.util.ArrayList;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.DatabaseUtils;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase;
public class DatabaseHandler extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "NoteDatabase.db";
public static final String NOTES_TABLE_NAME = "notes";
public static final String NOTES_COLUMN_ID = "id";
public static final String NOTES_COLUMN_NOTE = "note";
public DatabaseHandler(Context context)
{
super(context, DATABASE_NAME , null, 1);
}
#Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(
"create table notes " +
"(id integer primary key, note text)"
);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS notes");
onCreate(db);
}
public boolean insertNote (String note)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("note", note);
db.insert("notes", null, contentValues);
return true;
}
public Cursor getData(int id){
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery( "select * from contacts where id="+id+"", null );
return res;
}
public int numberOfRows(){
SQLiteDatabase db = this.getReadableDatabase();
int numRows = (int) DatabaseUtils.queryNumEntries(db, NOTES_TABLE_NAME);
return numRows;
}
public boolean updateNote (Integer id, String note)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("note", note);
db.update("notes", contentValues, "id = ? ", new String[] { Integer.toString(id) } );
return true;
}
public Integer deleteNote (Integer id)
{
SQLiteDatabase db = this.getWritableDatabase();
return db.delete("notes",
"id = ? ",
new String[] { Integer.toString(id) });
}
public ArrayList getAllNotes()
{
ArrayList array_list = new ArrayList();
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery( "select * from notes", null );
res.moveToFirst();
while(res.isAfterLast() == false){
array_list.add(res.getString(res.getColumnIndex(NOTES_COLUMN_NOTE)));
res.moveToNext();
}
return array_list;
}
}
Everything else, such as adding a new item, works as it should.
Edit - It now deletes the one that is selected, but it doesn't always actually delete and there seems to be no pattern - I've added some system.out.printlns to get a clearer picture but it says that it is deleting the right one when it isn't.

In some Projects I faced the same Problem. So there are two possible Solutions. First, after removing Your data from database, also remove item from listview/Adapter and call notifyDataSetChanged:
db.deleteNote(position);
arrayAdapter.remove(arrayAdapter.getItem(itemToRemove));
arrayAdapter.notifyDataSetChanged();
So, my Problem was, that this sometimes doesn´t work, until now, I don´t know what I was doing wrong. Anyway, if this doesn´t work, refresh the whole data after deleting:
private void refreshData(){
ArrayList array_list = db.getAllNotes();
ArrayAdapter arrayAdapter =
new ArrayAdapter(this,android.R.layout.simple_list_item_1, array_list);
list.setAdapter(arrayAdapter);
list.invalidateViews();
}
So this should look somehting like this in Your onClick:
adb.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
db.deleteNote(position);
refreshData();
Toast.makeText(getApplicationContext(), "Note Deleted", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getApplicationContext(), com1032.em00224.knit.NoteActivity.class);
startActivity(intent);
}
});
This is just from scratch, I can´t test the code for now because I have no IDE here. So don´t forget to do some Workaround (like opening and closing database etc.).

Related

Do I need to write SELECT query additionally while using content values?

I'm working on a code snippet for performing CRUD operations in Sqlite DB in Android Studio. I created a listView to hold two attributes, i.e., name and job but the application is getting crashed at runtime. It says:
Sqlite Exception: no such column( code 1) "name" Found.
I've searched for the solution but every solution I've checked is a failed one. My DB browser shows the table contains the column. Do I need to add SELECT FROM ...query to my code? If it is, then where should I put the code?
my code as below:
DatabaseHelper.class
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
public static final String DATABASE_NAME = "SQLiteDatabase.db";
public static final String TABLE_NAME = "USERS";
public static final String _ID = "_id";
public static final String DESC = "occupation";
public static final String SUBJECT = "name";
SQLiteDatabase myDb;
private static final String CREATE_TABLE = "CREATE TABLE " + TABLE_NAME +
"(" + _ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
+ SUBJECT + "TEXT NOT NULL,"
+ DESC + "TEXT"+ ")" ;
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_TABLE);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL(" DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
public long insert(String name, String desc) {
myDb = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(DatabaseHelper.SUBJECT, name);
contentValues.put(DatabaseHelper.DESC, desc);
long id = myDb.insert(DatabaseHelper.TABLE_NAME, null, contentValues);
myDb.close();
return id;
}
public Cursor read(){
SQLiteDatabase myDb = this.getWritableDatabase();
String[] columns = new String[] {DatabaseHelper._ID,DatabaseHelper.SUBJECT,DatabaseHelper.DESC};
Cursor cursor = myDb.query(DatabaseHelper.TABLE_NAME,columns,null,null,null,null,null);
if(cursor!=null){
cursor.moveToFirst();
}
myDb.close();
return cursor;
}
}
MainActivity.class
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
Button addUser;
ArrayList<String> list;
ArrayAdapter<String> adapter;
DatabaseHelper dbManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addUser = findViewById(R.id.add_button);
list = new ArrayList<>();
adapter = new ArrayAdapter<>(this, R.layout.populate_list, R.id.name, list);
dbManager = new DatabaseHelper(this);
addUser.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addAccount();
}
});
}
public void addAccount() {
Intent intent = new Intent(MainActivity.this, AddUser.class);
startActivityForResult(intent, 1);
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == 1) {
final String name = intent.getStringExtra("name");
final String occupation = intent.getStringExtra("occupation");
ListView listView = findViewById(R.id.parentLayout);
dbManager.read();
list.add(name);
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent i = new Intent(MainActivity.this, UpdateActivity.class);
i.putExtra(name, "username");
i.putExtra(occupation, "occupation");
startActivity(i);
}
});
}
}
}
AddUser.class
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class AddUser extends AppCompatActivity {
EditText userName, job;
Button submitButton, cancelButton;
DatabaseHelper dbManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_user);
dbManager = new DatabaseHelper(this);
userName = findViewById(R.id.userText);
job = findViewById(R.id.occupation);
submitButton = findViewById(R.id.submit_button);
cancelButton = findViewById(R.id.cancel_button);
cancelButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(AddUser.this, MainActivity.class);
startActivity(intent);
}
});
submitButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = getIntent();
String name = userName.getText().toString();
String desc = job.getText().toString();
intent.putExtra(name, "name");
intent.putExtra(desc, "occupation");
dbManager.insert(name, desc);
setResult(1, intent);
finish();
}
});
}
}

You can try using a rawquery like this :
String sql = " SELECT * FROM " + TABLE_NAME + " WHERE " + ONE_COLUMN_NAME + "=?" + " AND " + PERHAPS_ANOTHER_COLUMN + " =?";
ArrayList<YourKindOfObject> array = new ArrayList<>();
Cursor cursor = sqLiteDatabase.rawQuery(sql, new String[]{firstParameter, secondParameter});
while (cursor.moveToNext()) {
YourKindOfObject yourKindOfObject = new YourKindOfObject();
yourKindOfObject.setOneThing(cursor.getString(cursor.getColumnIndex(ColumnName));
yourKindOfObject.setOneOtherThing(cursor.getString(cursor.getColumnIndex(ColumnName1)));
array.add(yourKindOfObject);
}
cursor.close();
return array;

How display field values in new activity when particular listview is clicked?

I have a table on my database.
one of the field from that table is displayed as a listview in the main activity.
i have implemented the setOnItemClickListener to open the new activity to display other field values of that selected list item.
new activiy is successfully opened.
but i have trouble in displaying field values....
i have browsed many sites....
but nothing helped.....
i have displayed department names in listview...
in the new activity i need get the value of DEPT_LIST_COLUMN_ID and DEPT_LIST_COLUMN_NAME
MainActivity.java
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
public class MainActivity extends Activity {
private MyDBHelper mydb;
private SimpleCursorAdapter adapter;
public static final String Row_ID = "row_id";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//********************************//
//Begin of Database-Table1_Dept_List
//********************************//
ListView dplist=(ListView)findViewById(R.id.list_view);
//Instantiate table1_dept_list
mydb =new MyDBHelper(this, null, null,4);
SQLiteDatabase db =mydb.getReadableDatabase();
//Removing duplicate values from table1_dept_list
mydb.delete_dep_list();
//Inserting into table1_dept_list
mydb.add_dept_list("DLBIOCHEM","BioChemistry");
mydb.add_dept_list("DLBIOTECH","BioTechnology");
mydb.add_dept_list("DLBOT", "Botany");
mydb.add_dept_list("DLCHEM","Chemistry");
mydb.add_dept_list("DLCOM","Commerce");
mydb.add_dept_list("DLCS","Computer Science");
mydb.add_dept_list("DLECO","Economics");
mydb.add_dept_list("DLEDU","Education");
mydb.add_dept_list("DLENG","English");
mydb.add_dept_list("DLEVS","Environmental Science");
mydb.add_dept_list("DLFSN","Food Science and Nutrition");
mydb.add_dept_list("DLGEO","Geology");
mydb.add_dept_list("DLJMC", "Journalism and Massmedia Communication");
mydb.add_dept_list("DLLIS","Library and Information Science");
mydb.add_dept_list("DLMATH","Mathematics");
mydb.add_dept_list("DLMICRO","Microbiology");
mydb.add_dept_list("DLPE","Physical Education");
mydb.add_dept_list("DLPHY","Physics");
mydb.add_dept_list("DLPRIMS","Periyar Institute of Management Studies");
mydb.add_dept_list("DLPSY","Psychology");
mydb.add_dept_list("DLSOC","Sociology");
mydb.add_dept_list("DLTAM", "Tamil");
mydb.add_dept_list("DLTAD","Textile and Apparel Design");
mydb.add_dept_list("DLZOO","Zoology");
//list view
Cursor AllDeptList = mydb.get_dept_list();
String[] from=new String[] {
MyDBHelper.DEPT_LIST_COLUMN_NAME
};
int[] to=new int[] {R.id.dis_text};
adapter = new SimpleCursorAdapter(this,R.layout.disp_text,AllDeptList,from,to,0 );
dplist.setAdapter(adapter);
//********************************//
//end of Database-Table1_Dept_List//
//********************************//
dplist.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
// TODO Auto-generated method stub
Cursor cursor = mydb.get_dept_list();
cursor.moveToPosition(position);
Intent intent_dp_list = new Intent(MainActivity.this,DepartmentDesignation.class);
intent_dp_list.putExtra(Row_ID,arg3);
startActivity(intent_dp_list);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
DepartmentDesignation.java
package com.example.contact;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.widget.SimpleCursorAdapter;
import android.widget.TextView;
public class DepartmentDesignation extends Activity {
private SimpleCursorAdapter adapter;
public static String d_id;
public static String d_name;
private String Row_id;
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.disp_dept_desig);
TextView tx_id = (TextView)findViewById(R.id.id);
Intent extras = getIntent();
tx_id.setText(extras.getStringExtra(Row_id));
TextView tx_name=(TextView)findViewById(R.id.name);
tx_name.setText(d_name);
}
}
MyDBHelper.java
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class MyDBHelper extends SQLiteOpenHelper{
public static final String DEPT_LIST_TABLE1_NAME="tbl_dep_list";
public static final String DEPT_LIST_ROW_ID = "_id";
public static final String DEPT_LIST_COLUMN_ID = "fld_tb1_id";
public static final String DEPT_LIST_COLUMN_NAME="fld_tb1_list";
public MyDBHelper(Context context, String name, CursorFactory factory,
int version) {
super(context, "contact_book.db", factory, 11);
// TODO Auto-generated constructor stub
}
#Override
public void onCreate(SQLiteDatabase database) {
// TODO Auto-generated method stub
database.execSQL(" CREATE TABLE " + DEPT_LIST_TABLE1_NAME + "(" + DEPT_LIST_ROW_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + DEPT_LIST_COLUMN_ID + " TEXT, " + DEPT_LIST_COLUMN_NAME + " TEXT ) " );
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + DEPT_LIST_TABLE1_NAME);
onCreate(db);
}
public void add_dept_list(String dl_id, String dep_list) {
// TODO Auto-generated method stub
ContentValues values = new ContentValues(2);
values.put(MyDBHelper.DEPT_LIST_COLUMN_ID , dl_id);
values.put(MyDBHelper.DEPT_LIST_COLUMN_NAME,dep_list);
getWritableDatabase().insert(MyDBHelper.DEPT_LIST_TABLE1_NAME,null,values);
}
public int delete_dep_list(){
try{
SQLiteDatabase db =this.getWritableDatabase();
return db.delete(DEPT_LIST_TABLE1_NAME, null, null);
}
catch(Exception e){
e.printStackTrace();
}
return 0;
}
public Cursor get_dept_list(){
String[] from = new String[] {MyDBHelper.DEPT_LIST_ROW_ID,MyDBHelper.DEPT_LIST_COLUMN_ID,MyDBHelper.DEPT_LIST_COLUMN_NAME};
Cursor cursor = getReadableDatabase().query(MyDBHelper.DEPT_LIST_TABLE1_NAME, from,null,null,null, null, null);
if(cursor != null){
cursor.moveToFirst();
}
return cursor;
}
}

On your onItemClick method, pass the values you need in an intent to open the activity.
Intent intent = new Intent("blah blah");
intent.putExtra(DEPT_LIST_COLUMN_ID, "value");
intent.putExtra(DEPT_LIST_COLUMN_NAME, "value");
Then on the opened activity, do:
extras.getStringExtra(DEPT_LIST_COLUMN_ID)

How to select an item from ListView and see its corresponding id from SQLite database

I have the following two files:
podatkovna_baza.java
package com.example.ultimate.basketball.stats;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class podatkovna_baza extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "baza5";
public podatkovna_baza(Context context) {
super(context, DATABASE_NAME, null, 1);
}
#Override
public void onCreate(SQLiteDatabase baza5) {
/*
* Create the employee table and populate it with sample data.
* In step 6, we will move these hardcoded statements to an XML document.
*/
String sql = "CREATE TABLE IF NOT EXISTS ekipe4 (" +
"_id INTEGER PRIMARY KEY AUTOINCREMENT, " +
"ime_ekipe TEXT, " +
"kratko_ime TEXT, " +
"kraj TEXT, " +
"slika TEXT )";
baza5.execSQL(sql);
ContentValues values = new ContentValues();
values.put("ime_ekipe", "Drustvo partizan");
values.put("kratko_ime", "DRP");
values.put("kraj", "Mirna");
values.put("slika", "jajaja");
baza5.insert("ekipe4", null, values);
}
#Override
public void onUpgrade(SQLiteDatabase baza5, int oldVersion, int newVersion) {
baza5.execSQL("DROP TABLE IF EXISTS ekipe4");
onCreate(baza5);
}
}
osnovni_meni.java
package com.example.ultimate.basketball.stats;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.os.Vibrator;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class osnovni_meni extends Activity {
protected SQLiteDatabase baza5;
protected Cursor cursor;
protected ListAdapter adapter;
protected ListView ekipe_list;
protected EditText searchtext;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_osnovni_meni);
baza5 = (new podatkovna_baza(this)).getWritableDatabase();
//searchtext = (EditText) findViewById (R.id.searchText);
//searchText = (EditText) findViewById (R.id.searchText);
//employeeList = (ListView) findViewById (R.id.list);
}
public void hello(View view) {
//cursor = baza2.rawQuery("SELECT ime_ekipe, kratko_ime, kraj FROM ekipe2" , null);
ekipe_list = (ListView) findViewById (R.id.lista);
cursor = baza5.query("ekipe4", null, null, null, null, null,
"_id" + " ASC");
adapter = new SimpleCursorAdapter(
this,
R.layout.ekipe_layout,
cursor,
new String[] {"_id","kratko_ime","kraj"},
new int[] {R.id.ime_ekipe,R.id.kratko_ime,R.id.kraj});
ekipe_list.setAdapter(adapter);
String sadas=adapter.toStr
}
public void delete_byID(int id) {
baza5.delete("ekipe4", "_id"+"="+id, null);
}
public void delete_by_ime_ekipe(String ime) {
baza5.delete("ekipe4", "kraj"+"="+ime, null);
}
public int deleteAll() {
return baza5.delete("ekipe4", null, null);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_osnovni_meni, menu);
return true;
}
public void onBackPressed() {
// TODO Auto-generated method stub
//super.onBackPressed();
finish();
}
public void vibriraj()
{
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(30);
}
public void vpisi(View view)
{
ContentValues values1 = new ContentValues();
//values1.put("_id", "1");
values1.put("ime_ekipe", "Chicago Bulls");
values1.put("kratko_ime", "CHI");
values1.put("kraj", "Chicago");
baza5.insert("ekipe4", "kratko_ime", values1);
vibriraj();
}
public void vpisi_ekipo(View view)
{
vibriraj();
EditText novo_ime_ekipe = (EditText) findViewById (R.id.novo_ime_ekipe);
EditText novo_kratko_ime_ekipe = (EditText) findViewById (R.id.novo_kratko_ime_ekipe);
EditText novo_kraj_ekipe = (EditText) findViewById (R.id.novo_kraj_ekipe);
EditText novo_slika_ekipe = (EditText) findViewById (R.id.novo_slika_ekipe);
ContentValues values1 = new ContentValues();
values1.put("ime_ekipe", (novo_ime_ekipe.getText()).toString());
values1.put("kratko_ime", (novo_kratko_ime_ekipe.getText()).toString());
values1.put("kraj", (novo_kraj_ekipe.getText()).toString());
values1.put("slika", (novo_slika_ekipe.getText()).toString());
baza5.insert("ekipe4", "kratko_ime", values1);
vibriraj();
setContentView(R.layout.edit_teams);
}
}
Now I want to for example delete a row I select (get ID from list and corresponding ID from database) or edit a row. How do I do this? It's pretty easy to delete or edit a SQLite entry if you know the id from a database, but I do not.
Sorry for my English, as you can see, it's not my first language.

ekipe_list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id){
// your code here
}
});
Here in "position" you get the id of the item you've clicked.
So you need only to convert the id in ListView to the id in database.
Otherwise you will need to create custom adapter instead of SimpleCursorAdapter, and override the getView() method.

in the select query you have mentioned "SELECT * FROM ANSWER WHERE ID="
But you have to mention as " "SELECT * FROM answer WHERE ID"
Because table name is answer not ANSWER

can i use database demo

Hello people i have been making my app now for 6 month. iv been working on my layout all this time and coding etc.
Now for the Last month iv been trying to make a database. But i just can't get my head round this problem. I have finished the android notepad tutorial and i have downloaded SQLite database browser. and even tho i have a working database from the notepad v3( add & delete data) i just don't know if i can use this database demo in my project.
also i was on some stack overflow page (cant find it now) and someone put a link to a database demo zip file in which i downloaded and when i run it. its just what am after.
hope you guys can help me out and let me know if i can just use this database demo as my own..
Don't get me wrong am not looking for a easy way out of making my own database or learning about it.
There is a lot to learn in the android world. and if i have a working DB which i can use on other project i will learn along the way about coding..
here is the java code of the database demo its a bit heavy pasteing all this so sorry
if you would like to see my XML please just say..
package mina.android.DatabaseDemo;
import android.app.Activity;
import android.app.Dialog;
import android.database.Cursor;
import android.os.Bundle;
import android.text.Spannable;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.SimpleCursorAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;
public class AddEmployee extends Activity {
EditText txtName;
EditText txtAge;
TextView txtEmps;
DatabaseHelper dbHelper;
Spinner spinDept;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.addemployee);
txtName=(EditText)findViewById(R.id.txtName);
txtAge=(EditText)findViewById(R.id.txtAge);
txtEmps=(TextView)findViewById(R.id.txtEmps);
spinDept=(Spinner)findViewById(R.id.spinDept);
}
#Override
public void onStart()
{
try
{
super.onStart();
dbHelper=new DatabaseHelper(this);
txtEmps.setText(txtEmps.getText()+String.valueOf(dbHelper.getEmployeeCount()));
Cursor c=dbHelper.getAllDepts();
startManagingCursor(c);
//SimpleCursorAdapter ca=new
SimpleCursorAdapter(this,android.R.layout.simple_spinner_item, c, new String []
{DatabaseHelper.colDeptName}, new int []{android.R.id.text1});
SimpleCursorAdapter ca=new
SimpleCursorAdapter(this,R.layout.deptspinnerrow, c, new String []
{DatabaseHelper.colDeptName,"_id"}, new int []{R.id.txtDeptName});
//ca.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinDept.setAdapter(ca);
spinDept.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View
selectedView,
int position, long id) {
// TODO Auto-generated method stub
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
//never close cursor
}
catch(Exception ex)
{
CatchError(ex.toString());
}
}
public void btnAddEmp_Click(View view)
{
boolean ok=true;
try
{
Spannable spn=txtAge.getText();
String name=txtName.getText().toString();
int age=Integer.valueOf(spn.toString());
int deptID=Integer.valueOf((int)spinDept.getSelectedItemId());
Employee emp=new Employee(name,age,deptID);
dbHelper.AddEmployee(emp);
}
catch(Exception ex)
{
ok=false;
CatchError(ex.toString());
}
finally
{
if(ok)
{
//NotifyEmpAdded();
Alerts.ShowEmpAddedAlert(this);
txtEmps.setText("Number of employees
"+String.valueOf(dbHelper.getEmployeeCount()));
}
}
}
void CatchError(String Exception)
{
Dialog diag=new Dialog(this);
diag.setTitle("Add new Employee");
TextView txt=new TextView(this);
txt.setText(Exception);
diag.setContentView(txt);
diag.show();
}
void NotifyEmpAdded()
{
Dialog diag=new Dialog(this);
diag.setTitle("Add new Employee");
TextView txt=new TextView(this);
txt.setText("Employee Added Successfully");
diag.setContentView(txt);
diag.show();
try {
diag.wait(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
CatchError(e.toString());
}
diag.notify();
diag.dismiss();
}
}
package mina.android.DatabaseDemo;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Spinner;
import android.widget.TextView;
public class Alerts {
public static void ShowEmpAddedAlert(Context con)
{
AlertDialog.Builder builder=new AlertDialog.Builder(con);
builder.setTitle("Add new Employee");
builder.setIcon(android.R.drawable.ic_dialog_info);
DialogListner listner=new DialogListner();
builder.setMessage("Employee Added successfully");
builder.setPositiveButton("ok", listner);
AlertDialog diag=builder.create();
diag.show();
}
public static AlertDialog ShowEditDialog(final Context con,final Employee emp)
{
AlertDialog.Builder b=new AlertDialog.Builder(con);
b.setTitle("Employee Details");
LayoutInflater li=LayoutInflater.from(con);
View v=li.inflate(R.layout.editdialog, null);
b.setIcon(android.R.drawable.ic_input_get);
b.setView(v);
final TextView txtName=(TextView)v.findViewById(R.id.txtDelName);
final TextView txtAge=(TextView)v.findViewById(R.id.txtDelAge);
final Spinner spin=(Spinner)v.findViewById(R.id.spinDiagDept);
Utilities.ManageDeptSpinner(con, spin);
for(int i=0;i<spin.getCount();i++)
{
long id=spin.getItemIdAtPosition(i);
if(id==emp.getDept())
{
spin.setSelection(i, true);
break;
}
}
txtName.setText(emp.getName());
txtAge.setText(String.valueOf(emp.getAge()));
b.setPositiveButton("Modify", new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
emp.setName(txtName.getText().toString());
emp.setAge(Integer.valueOf(txtAge.getText().toString()));
emp.setDept((int)spin.getItemIdAtPosition(spin.getSelectedItemPosition()));
try
{
DatabaseHelper db=new DatabaseHelper(con);
db.UpdateEmp(emp);
}
catch(Exception ex)
{
CatchError(con, ex.toString());
}
}
});
b.setNeutralButton("Delete", new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
DatabaseHelper db=new DatabaseHelper(con);
db.DeleteEmp(emp);
}
});
b.setNegativeButton("Cancel", null);
return b.create();
//diag.show();
}
static public void CatchError(Context con, String Exception)
{
Dialog diag=new Dialog(con);
diag.setTitle("Error");
TextView txt=new TextView(con);
txt.setText(Exception);
diag.setContentView(txt);
diag.show();
}
}
package mina.android.DatabaseDemo
import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.GridView;
import android.widget.TabHost;
import android.widget.TextView;
public class DatabaseDemo extends TabActivity {
DatabaseHelper dbHelper;
GridView grid;
TextView txtTest;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
SetupTabs();
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
menu.add(1, 1, 1, "Add Employee");
return true;
}
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
//Add employee
case 1:
Intent addIntent=new Intent(this,AddEmployee.class);
startActivity(addIntent);
break;
}
super.onOptionsItemSelected(item);
return false;
}
void SetupTabs()
{
TabHost host=getTabHost();
TabHost.TabSpec spec=host.newTabSpec("tag1");
Intent in1=new Intent(this, AddEmployee.class);
spec.setIndicator("Add Employee");
spec.setContent(in1);
TabHost.TabSpec spec2=host.newTabSpec("tag2");
Intent in2=new Intent(this, GridList.class);
spec2.setIndicator("Employees");
spec2.setContent(in2);
host.addTab(spec);
host.addTab(spec2);
}
}
package mina.android.DatabaseDemo;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseHelper extends SQLiteOpenHelper {
static final String dbName="demoDB";
static final String employeeTable="Employees";
static final String colID="EmployeeID";
static final String colName="EmployeeName";
static final String colAge="Age";
static final String colDept="Dept";
static final String deptTable="Dept";
static final String colDeptID="DeptID";
static final String colDeptName="DeptName";
static final String viewEmps="ViewEmps";
public DatabaseHelper(Context context) {
super(context, dbName, null,33);
// TODO Auto-generated constructor stub
}
#Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("CREATE TABLE "+deptTable+" ("+colDeptID+ " INTEGER PRIMARY KEY
, "+
colDeptName+ " TEXT)");
db.execSQL("CREATE TABLE "+employeeTable+" ("+colID+" INTEGER PRIMARY KEY
AUTOINCREMENT, "+
colName+" TEXT, "+colAge+" Integer, "+colDept+" INTEGER
NOT NULL ,FOREIGN KEY ("+colDept+") REFERENCES "+deptTable+"
("+colDeptID+"));");
db.execSQL("CREATE TRIGGER fk_empdept_deptid " +
" BEFORE INSERT "+
" ON "+employeeTable+
" FOR EACH ROW BEGIN"+
" SELECT CASE WHEN ((SELECT "+colDeptID+" FROM
"+deptTable+" WHERE "+colDeptID+"=new."+colDept+" ) IS NULL)"+
" THEN RAISE (ABORT,'Foreign Key Violation') END;"+
" END;");
db.execSQL("CREATE VIEW "+viewEmps+
" AS SELECT "+employeeTable+"."+colID+" AS _id,"+
" "+employeeTable+"."+colName+","+
" "+employeeTable+"."+colAge+","+
" "+deptTable+"."+colDeptName+""+
" FROM "+employeeTable+" JOIN "+deptTable+
" ON "+employeeTable+"."+colDept+"
="+deptTable+"."+colDeptID
);
//Inserts pre-defined departments
InsertDepts(db);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS "+employeeTable);
db.execSQL("DROP TABLE IF EXISTS "+deptTable);
db.execSQL("DROP TRIGGER IF EXISTS dept_id_trigger");
db.execSQL("DROP TRIGGER IF EXISTS dept_id_trigger22");
db.execSQL("DROP TRIGGER IF EXISTS fk_empdept_deptid");
db.execSQL("DROP VIEW IF EXISTS "+viewEmps);
onCreate(db);
}
void AddEmployee(Employee emp)
{
SQLiteDatabase db= this.getWritableDatabase();
ContentValues cv=new ContentValues();
cv.put(colName, emp.getName());
cv.put(colAge, emp.getAge());
cv.put(colDept, emp.getDept());
//cv.put(colDept,2);
db.insert(employeeTable, colName, cv);
db.close();
}
int getEmployeeCount()
{
SQLiteDatabase db=this.getWritableDatabase();
Cursor cur= db.rawQuery("Select * from "+employeeTable, null);
int x= cur.getCount();
cur.close();
return x;
}
Cursor getAllEmployees()
{
SQLiteDatabase db=this.getWritableDatabase();
//Cursor cur= db.rawQuery("Select "+colID+" as _id , "+colName+",
"+colAge+" from "+employeeTable, new String [] {});
Cursor cur= db.rawQuery("SELECT * FROM "+viewEmps,null);
return cur;
}
Cursor getAllDepts()
{
SQLiteDatabase db=this.getReadableDatabase();
Cursor cur=db.rawQuery("SELECT "+colDeptID+" as _id, "+colDeptName+" from
"+deptTable,new String [] {});
return cur;
}
void InsertDepts(SQLiteDatabase db)
{
ContentValues cv=new ContentValues();
cv.put(colDeptID, 1);
cv.put(colDeptName, "Sales");
db.insert(deptTable, colDeptID, cv);
cv.put(colDeptID, 2);
cv.put(colDeptName, "IT");
db.insert(deptTable, colDeptID, cv);
cv.put(colDeptID, 3);
cv.put(colDeptName, "HR");
db.insert(deptTable, colDeptID, cv);
db.insert(deptTable, colDeptID, cv);
}
public String GetDept(int ID)
{
SQLiteDatabase db=this.getReadableDatabase();
String[] params=new String[]{String.valueOf(ID)};
Cursor c=db.rawQuery("SELECT "+colDeptName+" FROM"+ deptTable+" WHERE
"+colDeptID+"=?",params);
c.moveToFirst();
int index= c.getColumnIndex(colDeptName);
return c.getString(index);
}
public Cursor getEmpByDept(String Dept)
{
SQLiteDatabase db=this.getReadableDatabase();
String [] columns=new String[]{"_id",colName,colAge,colDeptName};
Cursor c=db.query(viewEmps, columns, colDeptName+"=?", new String[]
{Dept}, null, null, null);
return c;
}
public int GetDeptID(String Dept)
{
SQLiteDatabase db=this.getReadableDatabase();
Cursor c=db.query(deptTable, new String[]{colDeptID+" as
_id",colDeptName},colDeptName+"=?", new String[]{Dept}, null, null, null);
//Cursor c=db.rawQuery("SELECT "+colDeptID+" as _id FROM "+deptTable+"
WHERE "+colDeptName+"=?", new String []{Dept});
c.moveToFirst();
return c.getInt(c.getColumnIndex("_id"));
}
public int UpdateEmp(Employee emp)
{
SQLiteDatabase db=this.getWritableDatabase();
ContentValues cv=new ContentValues();
cv.put(colName, emp.getName());
cv.put(colAge, emp.getAge());
cv.put(colDept, emp.getDept());
return db.update(employeeTable, cv, colID+"=?", new String
[]{String.valueOf(emp.getID())});
}
public void DeleteEmp(Employee emp)
{
SQLiteDatabase db=this.getWritableDatabase();
db.delete(employeeTable,colID+"=?", new String []
{String.valueOf(emp.getID())});
db.close();
}
}
package mina.android.DatabaseDemo;
import android.content.DialogInterface;
public class DialogListner implements
android.content.DialogInterface.OnClickListener {
public DialogListner()
{
}
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}
package mina.android.DatabaseDemo;
import android.content.Context;
public class Employee {
int _id;
String _name;
int _age;
int _dept;
public Employee(String Name,int Age,int Dept)
{
this._name=Name;
this._age=Age;
this._dept=Dept;
}
public Employee(String Name,int Age)
{
this._name=Name;
this._age=Age;
}
public int getID()
{
return this._id;
}
public void SetID(int ID)
{
this._id=ID;
}
public String getName()
{
return this._name;
}
public int getAge()
{
return this._age;
}
public void setName(String Name)
{
this._name=Name;
}
public void setAge(int Age)
{
this._age=Age;
}
public void setDept(int Dept)
{
this._dept=Dept;
}
public String getDeptName(Context con, int Dept)
{
return new DatabaseHelper(con).GetDept(Dept);
}
public int getDept()
{
return this._dept;
}
}
package mina.android.DatabaseDemo;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnDismissListener;
import android.database.Cursor;
import android.database.sqlite.SQLiteCursor;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.SimpleCursorAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
public class GridList extends Activity {
DatabaseHelper dbHelper;
static public GridView grid;
TextView txtTest;
Spinner spinDept1;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gridview);
grid=(GridView)findViewById(R.id.grid);
txtTest=(TextView)findViewById(R.id.txtTest);
spinDept1=(Spinner)findViewById(R.id.spinDept1);
Utilities.ManageDeptSpinner(this.getParent(),spinDept1);
final DatabaseHelper db=new DatabaseHelper(this);
try
{
http://img856.imageshack.us/img856/446/hoop.png
spinDept1.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
LoadGrid();
//sca.notifyDataSetChanged();
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
catch(Exception ex)
{
txtTest.setText(ex.toString());
}
try
{
grid.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> parent, View v, int position,
long id) {
// TODO Auto-generated method stub
try
{
SQLiteCursor
cr=(SQLiteCursor)parent.getItemAtPosition(position);
String
name=cr.getString(cr.getColumnIndex(DatabaseHelper.colName));
int
age=cr.getInt(cr.getColumnIndex(DatabaseHelper.colAge));
String
Dept=cr.getString(cr.getColumnIndex(DatabaseHelper.colDeptName));
Employee emp=new Employee(name, age,db.GetDeptID(Dept));
emp.SetID((int)id);
AlertDialog diag= Alerts.ShowEditDialog(GridList.this,emp);
diag.setOnDismissListener(new OnDismissListener() {
public void onDismiss(DialogInterface dialog) {
// TODO Auto-generated method stub
txtTest.setText("dismissed");
//((SimpleCursorAdapter)grid.getAdapter()).notifyDataSetChanged();
LoadGrid();
}
});
diag.show();
}
catch(Exception ex)
{
Alerts.CatchError(GridList.this, ex.toString());
}
}
}
);
}
catch(Exception ex)
{
}
}
#Override
public void onStart()
{
super.onStart();
//LoadGrid();
}
public void LoadGrid()
{
dbHelper=new DatabaseHelper(this);
try
{
//Cursor c=dbHelper.getAllEmployees();
View v=spinDept1.getSelectedView();
TextView txt=(TextView)v.findViewById(R.id.txtDeptName);
String Dept=String.valueOf(txt.getText());
Cursor c=dbHelper.getEmpByDept(Dept);
startManagingCursor(c);
String [] from=new String
[]{DatabaseHelper.colName,DatabaseHelper.colAge,DatabaseHelper.colDeptName};
int [] to=new int [] {R.id.colName,R.id.colAge,R.id.colDept};
SimpleCursorAdapter sca=new
SimpleCursorAdapter(this,R.layout.gridrow,c,from,to);
grid.setAdapter(sca);
}
catch(Exception ex)
{
AlertDialog.Builder b=new AlertDialog.Builder(this);
b.setMessage(ex.toString());
b.show();
}
}
}
package mina.android.DatabaseDemo;
import android.content.Context;
import android.database.Cursor;
import android.widget.SimpleCursorAdapter;
import android.widget.Spinner;
public class Utilities {
static public void ManageDeptSpinner(Context context,Spinner view)
{
DatabaseHelper dbHelper=new DatabaseHelper(context);
Cursor c=dbHelper.getAllDepts();
//context.startManagingCursor(c);
//SimpleCursorAdapter ca=new
SimpleCursorAdapter(this,android.R.layout.simple_spinner_item, c, new String []
{DatabaseHelper.colDeptName}, new int []{android.R.id.text1});
SimpleCursorAdapter ca=new
SimpleCursorAdapter(context,R.layout.deptspinnerrow,c,
new String [] {DatabaseHelper.colDeptName,"_id"}, new int []{R.id.txtDeptName});
view.setAdapter(ca);
}
}

Most Android demos, including the current version of Notepad, use the Apache License v2.0. This license says you can freely use and redistribute the code, but you must preserve all existing notices and attributions, and clearly acknowledge that you have modified the code. (See paragraph 4 for the exact wording.)

How to use edittext.getText().toString()

I want to make it so that there is a ListView with a Button above it. The users clicks that button, and it opens a dialog with an EditText and an OK and Cancel button. When the user clicks OK, whatever text is entered into the EditText gets put into the SQLiteDatabase, which is reflected in the ListView.
I've already set up my SQLiteDatabase and have set an adapter for the List to show the SQLiteDatabase, but I need to figure out how to use the edittext.getText().toString() method to add to the SQLiteDatabase. I will need a code example.
If you need it, here's my main .java:
package com.gantt.shoppinglist;
import android.app.Dialog;
import android.app.ListActivity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class ShoppingList extends ListActivity {
/** Called when the activity is first created. */
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final DataHelper dataHelper = new DataHelper(this);
ListView lv = (ListView) findViewById(android.R.id.list);
SimpleCursorAdapter adapter = null;
final SQLiteDatabase db = dataHelper.selectAll();
Cursor c = db.rawQuery("SELECT DISTINCT oid as _id,name FROM table1 ORDER BY name", null);
if (c.moveToFirst()) {
String[] columnNames = new String[]{"name"};
int[] list = new int[]{android.R.id.list};
adapter = new SimpleCursorAdapter(this, R.layout.rowlayout, c, columnNames, list);
}
lv.setAdapter(adapter);
Button button1main = (Button) findViewById(R.id.add);
button1main.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
final Dialog additem = new Dialog(ShoppingList.this);
additem.setContentView(R.layout.maindialog);
final EditText et = (EditText)additem.findViewById(R.id.edittext);
additem.setTitle("Type your item");
additem.setCancelable(true);
et.setHint("Type the name of an item...");
Button button = (Button) additem.findViewById(R.id.cancel);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
additem.dismiss();
}
});
additem.show();
Button ok = (Button) additem.findViewById(R.id.ok);
ok.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
et.getText().toString();
additem.dismiss();
et.setText("");
}
});
}
});
}
}
Here is my DataHelper class:
package com.gantt.shoppinglist;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteStatement;
import android.util.Log;
public class DataHelper {
public static final String DATABASE_NAME = "items.db";
public static final int DATABASE_VERSION = 1;
public static final String TABLE_NAME = "table1";
public static final String KEY_ROWID = "_id";
private Context context;
private SQLiteDatabase db;
private SQLiteStatement insertStmt;
private static final String INSERT = "insert into "
+ TABLE_NAME + "(name) values (?)";
public DataHelper(Context context) {
this.context = context;
OpenHelper openHelper = new OpenHelper(this.context);
this.db = openHelper.getWritableDatabase();
this.insertStmt = this.db.compileStatement(INSERT);
}
public long insert(String name) {
this.insertStmt.bindString(1, name);
return this.insertStmt.executeInsert();
}
public void deleteAll() {
this.db.delete(TABLE_NAME, null, null);
}
public SQLiteDatabase selectAll() {
List<String> list = new ArrayList<String>();
Cursor cursor = this.db.query(TABLE_NAME, new String[] { "name" },
null, null, null, null, "name desc");
if (cursor.moveToFirst()) {
do {
list.add(cursor.getString(0));
} while (cursor.moveToNext());
}
if (cursor != null && !cursor.isClosed()) {
cursor.close();
}
return db;
}
public static String getDatabaseName() {
return DATABASE_NAME;
}
private static class OpenHelper extends SQLiteOpenHelper {
OpenHelper(Context context) {
super(context, getDatabaseName(), null, DATABASE_VERSION);
}
#Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + TABLE_NAME + "(id INTEGER PRIMARY KEY, name TEXT");
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w("Example", "Upgrading database, this will drop tables and recreate.");
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
}

Using the current methods you have, and assuming that you understand the code that you used for the database adapter, just do this:
String item = et.getText().toString();// these two lines are the
dataHelper.insert(item); // only change you have to do
additem.dismiss();
et.setText("");
After doing this, you have to call the notifyDataSetChanged method of your SimpleCursorAdapter object.

A simple sample method for your DataHelper class:
public long createUser(String email, String password, String fullName) {
ContentValues initialValues = new ContentValues();
initialValues.put("email", email);
initialValues.put("password", password);
initialValues.put("fullName", fullName);
return mDb.insert(TABLE_NAME, null, initialValues);
}

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Can't delete Database item SQLite Android - android

Related

Do I need to write SELECT query additionally while using content values?

How display field values in new activity when particular listview is clicked?

How to select an item from ListView and see its corresponding id from SQLite database

can i use database demo

How to use edittext.getText().toString()

Categories

Resources