here is the situation- I
I am making a flash card app- I am populating a spinner with data from an SQLite file anyhow I have looked at a couple differnt tutoritals one is populating a spinner with an SQLIite file the other is working with a free populated SQL the activity always crashes so the exception says the table is not found- the SQLite is in the asset file created by android studio I have included a zip file with the two files iving me a headache.
The activity loads just fine and dandy as long as I don't try to populate the spinner with something from the SQL file- if I do that it then dies. I want to do it that way as I plan to give the user the option to create their own custom lists. That may be a later feature. here is the code for the add a flashcard
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.Toast;
import java.util.List;
public class AddNewFlashCards extends Activity implements OnItemSelectedListener {
private static final String TABLE_NAME = "nouns";
private static final String FRIEND_ID = "_id_noun";
private static final String FRIEND_NAME = "Russian_word";
private static final String english = "English_word";
private static final String DB_NAME = "Russian_Tutor.sqlite3";
private SQLiteDatabase database;
private ListView listView;
private ArrayList<String> partsOfSpeech;
SQLiteDatabase mydb;
private static String DBNAME = "Russian_Tutor.sqlite3";
private static String TABLE = "parts_of_speech";
// Spinner element
Spinner partOfSpeechSpinner;
private Object allLabels;
@override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_new_flash_cards);
// Spinner element
partOfSpeechSpinner = (Spinner) findViewById(R.id.partOfSpeechSpinner);
// Spinner click listener
partOfSpeechSpinner.setOnItemSelectedListener(this);
// Loading spinner data from database
loadSpinnerData();
}
/**
* Function to load the spinner data from SQLite database
* */
private void loadSpinnerData() {
// database handler
DataBaseHelper db = new DataBaseHelper(getApplicationContext());
// Spinner Drop down elements
List<String> lables = db.getAllLabels();
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, lables);
// Drop down layout style - list view with radio button
dataAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
partOfSpeechSpinner.setAdapter(dataAdapter);
}
@override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
}
@override
public void onNothingSelected(AdapterView<?> adapterView) {
}
}
here is the external database helper
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.i
utputStream;
import java.util.ArrayList;
import java.util.List;
public class DataBaseHelper extends SQLiteOpenHelper {
//The Android's default system path of your application database.
private static String DB_PATH = "/data/data/YOUR_PACKAGE/databases/";
private static String DB_NAME = "myDBName";
private SQLiteDatabase myDataBase;
private final Context myContext;
/**
* Constructor
* Takes and keeps a reference of the passed context in order to access to the application assets and resources.
* @param context
*/
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}
/**
* Creates a empty database on the system and rewrites it with your own database.
* */
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if(dbExist){
//do nothing - database already exist
}else{
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
/**
* Check if the database already exist to avoid re-copying the file each time you open the application.
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created empty database in the
* system folder, from where it can be accessed and handled.
* This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException {
//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@override
public void onCreate(SQLiteDatabase db) {
}
@override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public List<String> getAllLabels(){
List<String> labels = new ArrayList<String>();
// Select All Query
String selectQuery = "SELECT * FROM nouns" ;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
labels.add(cursor.getString(1));
} while (cursor.moveToNext());
}
// closing connection
cursor.close();
db.close();
// returning lables
return labels;
}
}
I am making a flash card app- I am populating a spinner with data from an SQLite file anyhow I have looked at a couple differnt tutoritals one is populating a spinner with an SQLIite file the other is working with a free populated SQL the activity always crashes so the exception says the table is not found- the SQLite is in the asset file created by android studio I have included a zip file with the two files iving me a headache.
The activity loads just fine and dandy as long as I don't try to populate the spinner with something from the SQL file- if I do that it then dies. I want to do it that way as I plan to give the user the option to create their own custom lists. That may be a later feature. here is the code for the add a flashcard
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.Toast;
import java.util.List;
public class AddNewFlashCards extends Activity implements OnItemSelectedListener {
private static final String TABLE_NAME = "nouns";
private static final String FRIEND_ID = "_id_noun";
private static final String FRIEND_NAME = "Russian_word";
private static final String english = "English_word";
private static final String DB_NAME = "Russian_Tutor.sqlite3";
private SQLiteDatabase database;
private ListView listView;
private ArrayList<String> partsOfSpeech;
SQLiteDatabase mydb;
private static String DBNAME = "Russian_Tutor.sqlite3";
private static String TABLE = "parts_of_speech";
// Spinner element
Spinner partOfSpeechSpinner;
private Object allLabels;
@override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_new_flash_cards);
// Spinner element
partOfSpeechSpinner = (Spinner) findViewById(R.id.partOfSpeechSpinner);
// Spinner click listener
partOfSpeechSpinner.setOnItemSelectedListener(this);
// Loading spinner data from database
loadSpinnerData();
}
/**
* Function to load the spinner data from SQLite database
* */
private void loadSpinnerData() {
// database handler
DataBaseHelper db = new DataBaseHelper(getApplicationContext());
// Spinner Drop down elements
List<String> lables = db.getAllLabels();
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, lables);
// Drop down layout style - list view with radio button
dataAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
partOfSpeechSpinner.setAdapter(dataAdapter);
}
@override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
}
@override
public void onNothingSelected(AdapterView<?> adapterView) {
}
}
here is the external database helper
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.i
utputStream;import java.util.ArrayList;
import java.util.List;
public class DataBaseHelper extends SQLiteOpenHelper {
//The Android's default system path of your application database.
private static String DB_PATH = "/data/data/YOUR_PACKAGE/databases/";
private static String DB_NAME = "myDBName";
private SQLiteDatabase myDataBase;
private final Context myContext;
/**
* Constructor
* Takes and keeps a reference of the passed context in order to access to the application assets and resources.
* @param context
*/
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}
/**
* Creates a empty database on the system and rewrites it with your own database.
* */
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if(dbExist){
//do nothing - database already exist
}else{
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
/**
* Check if the database already exist to avoid re-copying the file each time you open the application.
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created empty database in the
* system folder, from where it can be accessed and handled.
* This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH + DB_NAME;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException {
//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@override
public void onCreate(SQLiteDatabase db) {
}
@override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public List<String> getAllLabels(){
List<String> labels = new ArrayList<String>();
// Select All Query
String selectQuery = "SELECT * FROM nouns" ;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
labels.add(cursor.getString(1));
} while (cursor.moveToNext());
}
// closing connection
cursor.close();
db.close();
// returning lables
return labels;
}
}