I want to show my data from sqlite to Custom ListView (java , Android studio , sqlite ).
But it's force stop.
picture from my Main Activity:
picture from my Database class:
Please Help me!!!!
(my English is not good sorry but can i understand your words)
first you have to create a custom adapter for your listview and populate that adapter with listview and your code should be like this
and to get the data from database create a method in database class name getdata() take it in a form of cursor
public class UserDbHelper extends SQLiteOpenHelper {
public static final String DATABASENAME = "DATABASENAME2";
public static final int DB_VERSION = 3;
public static final String TABLE_NAME = "student";
public static final String DEVICE = "device"; //your coloumn
public static final String ADDRESS = "address";//your coloumn
public static final String Date = "Date"; //your coloumn
public String CREATE_QUERY = "CREATE TABLE "+TABLE_NAME+"("+DEVICE+" TEXT,"+ADDRESS+" TEXT,"+Date+"TEXT);";
public UserDbHelper(Context context)
{
super(context,DATABASENAME,null,DB_VERSION);
}
#Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
sqLiteDatabase.execSQL(CREATE_QUERY);
}
public List<Datalist> getdata()
{
List<Datalist> result = new ArrayList<>();
Cursor c = sqLiteDatabase.rawQuery("SELECT * FROM Table_name,null";);
while (c.moveToNext()) {
result.add(
new Datalist(
c.getString(c.getColumnIndex("YOUR COLOUMN")),
c.getString(c.getColumnIndex("YOUR COLOUMN")),
date
)
);
}
c.close();
return result;
}
and populate your database with listview
this will be in your button click that button which retrive the data
List<Datalist> itemFromDatabase = getItemFromDatabase();
MyAdapter adapter = new MyAdapter(getApplicationContext(), 0, itemFromDatabase);
listOfDatabaseObject.setAdapter(adapter);
adapter.notifyDataSetChanged();
MainActivity.java
public class MainActivity extends AppCompatActivity {
DataBaseHelper myDbHelper;
List<String> stringList;
ListView listView;
List<Mivejat> mivejatList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myDbHelper = new DataBaseHelper(this);
stringList = new ArrayList<>();
try {
myDbHelper.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
myDbHelper.openDataBase();
}catch(SQLException sqle){
throw sqle;
}
myDbHelper = new DataBaseHelper(this);
mivejatList = myDbHelper.MiveName();
for (int i = 0 ; 0 < mivejatList.size() ; i++) {
stringList.add(mivejatList.get(i).name);
}
listView = (ListView) findViewById(R.id.listViewMive);
mainListViewClass mainListViewClass = new mainListViewClass(MainActivity.this , stringList);
listView.setAdapter(mainListViewClass);
mainListViewClass.notifyDataSetChanged();
myDbHelper.close();
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
DataBaseHelper myDbHelper;
List<String> stringList;
ListView listView;
List<Mivejat> mivejatList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myDbHelper = new DataBaseHelper(this);
stringList = new ArrayList<>();
try {
myDbHelper.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
myDbHelper.openDataBase();
}catch(SQLException sqle){
throw sqle;
}
myDbHelper = new DataBaseHelper(this);
mivejatList = myDbHelper.MiveName();
for (int i = 0 ; 0 < mivejatList.size() ; i++) {
stringList.add(mivejatList.get(i).name);
}
listView = (ListView) findViewById(R.id.listViewMive);
mainListViewClass mainListViewClass = new mainListViewClass(MainActivity.this , stringList);
listView.setAdapter(mainListViewClass);
mainListViewClass.notifyDataSetChanged();
myDbHelper.close();
}
}
DataBaseHelper.java
public class DataBaseHelper extends SQLiteOpenHelper {
private static String DB_PATH = "/data/data/mivejat.rezaahmadpour.ir.mivejat/databases/";
private static String DB_NAME = "KhavasMiveha.db";
public static final int DB_VERS = 1;
private SQLiteDatabase myDataBase;
private final Context myContext;
private static String TAG = "KhavasMiveha.db";
/**
* 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, DB_VERS);
this.myContext = context;
}
/**
* Creates an empty database on the system and rewrites it with your own
* database.
*/
public boolean createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
Log.d(TAG, "database already exist");
//Running this method causes SQLite class checking for if New DB Version Exists and runs upgrade method
getReadableDatabase();
close();
return true;
} 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");
}
return false;
}
}
/**
* 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 transferring 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) {
Log.d(TAG, "UPGRADING Database...");
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
public List<Mivejat> MiveName() {
String query = "SELECT Name FROM tbl_mive";
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(query, null);
List<Mivejat> result = new ArrayList<>();
Mivejat m;
while (cursor.moveToNext()) {
m = new Mivejat();
m.name = cursor.getString(0);
result.add(m);
}
return result;
}
Related
I am trying to create a quiz app where a category can be selected by clicking on a listView item. Each category has code like 0,1,2. For football, it is 0. After clicking on the football item, the app keeps on going to the home screen instead of logging the data I want. Please help me with the error.
Quiz Category Selection Class
String quizCategory = intent.getStringExtra("QuizCategory");
//Deciding which database to Open and choose
switch (quizCategory) {
case "0":
Log.i("Category", "Football");
Football football = new Football(this);
football.createDatabase();
football.openDatabase();
football.getWritableDatabase();
long x=football.getRowCount();
break;
default:
Log.i("Message", "Error");
}
}
Football Class
public class Football extends SQLiteOpenHelper {
private static final String Database_path = "/data/data/com.google.quiz/databases/";
private static final String Database_name = "football.db";
private static Context context;
private static final int version = 1;
public SQLiteDatabase sqlite;
public Football(Context context) {
super(context, Database_name, null, version);
this.context = context;
}
#Override
public void onCreate(SQLiteDatabase db) {
}
#Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
}
public void createDatabase() {
createDB();
}
private void createDB() {
boolean dbexist = DBexists();
if (!dbexist) {
this.getReadableDatabase();
copyDBfromResource();
}
}
private void copyDBfromResource() {
InputStream is;
OutputStream os;
String filePath = Database_path + Database_name;
try {
is = context.getAssets().open(Database_name);//reading purpose
os = new FileOutputStream(filePath);//writing purpose
byte[] buffer = new byte[1024];
int length;
while ((length = is.read(buffer)) > 0) {
os.write(buffer, 0, length);//writing to file
}
os.flush();//flush the outputstream
is.close();//close the inputstream
os.close();//close the outputstream
} catch (IOException e) {
throw new Error("Problem copying database file:");
}
}
public void openDatabase() throws SQLException {
String myPath = Database_path + Database_name;
sqlite = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}
private boolean DBexists() {
SQLiteDatabase db = null;
try {
String databasePath = Database_path + Database_name;
db = SQLiteDatabase.openDatabase(databasePath, null, SQLiteDatabase.OPEN_READWRITE);
db.setLocale(Locale.getDefault());
db.setVersion(1);
db.setLockingEnabled(true);
} catch (SQLException e) {
Log.e("Sqlite", "Database not found");
}
if (db != null)
db.close();///close the opened file
return db != null ? true : false;
}
public long getRowCount() {
SQLiteDatabase db = this.getReadableDatabase();
long x = DatabaseUtils.queryNumEntries(db, "football");
db.close();
return x;
}
}
I'm extending DaoMaster.OpenHelper to manage assets folder database. Since it's not user related data the changes can be huge the only one thing I want to achieve is delete and recreate the database when there is a new version. What I don't understand is that this code works when i'm debugging my app on the emulator or even if i generate the apk and install it on my device manually. But when I deploy my app on the market and I install it on my device from there it looks like the it can't find the database.
Exception java.lang.RuntimeException: Unable to resume activity {com.livos.companionplants/com.livos.companionplants.main.MainActivity}: android.database.sqlite.SQLiteException: no such column: T.definition (code 1): , while compiling: SELECT T."_id",T."plant_id",T."definition" FROM "plant_definition" T ################################################################# Error Code : 1 (SQLITE_ERROR) Caused By : SQL(query) error or missing database. (no such column: T.definition (code 1): , while compiling: SELECT T."_id",T."plant_id",T."definition" FROM "plant_definition" T) #################################################################
#ApplicationScope
public class DatabaseOpenHelper extends DaoMaster.OpenHelper {
private String TAG = DatabaseOpenHelper.class.getSimpleName();
private static final String SP_KEY_DB_VER = "db_ver";
private static final int DATABASE_VERSION = 1;
private Context context;
private SharedPreferences sharedPreferences;
private SQLiteDatabase sqliteDatabase;
private static String DB_PATH;
private static String DB_NAME;
public DatabaseOpenHelper(Context context, SharedPreferences sharedPreferences, String name, SQLiteDatabase.CursorFactory factory) {
super(context, name, factory);
this.context = context;
this.sharedPreferences = sharedPreferences;
DB_NAME = name;
DB_PATH = context.getFilesDir().getAbsolutePath().replace("files", "databases") + File.separator;
try {
createDataBase();
} catch (Exception ioe) {
throw new Error("Unable to create database");
}
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
/** Open Database for Use */
public void openDatabase() {
String databasePath = DB_PATH + DB_NAME;
sqliteDatabase = SQLiteDatabase.openDatabase(databasePath, null,
(SQLiteDatabase.OPEN_READWRITE));
}
/** Close Database after use */
#Override
public synchronized void close() {
if ((sqliteDatabase != null) && sqliteDatabase.isOpen()) {
sqliteDatabase.close();
}
super.close();
}
/** Get database instance for use */
public SQLiteDatabase getSqliteDatabase() {
return sqliteDatabase;
}
/** Create new database if not present */
public void createDataBase() {
SQLiteDatabase sqliteDatabase;
if (databaseExists()) {
int dbVersion = sharedPreferences.getInt(SP_KEY_DB_VER, 1);
// If different version then delete current database and copy the new one from assets
if (DATABASE_VERSION != dbVersion) {
File dbFile = context.getDatabasePath(DB_NAME);
boolean dbFileDeleted = dbFile.delete();
if (!dbFileDeleted) {
Log.w(TAG, "Unable to update database");
} else {
createDataBase();
}
}
/* Check for Upgrade */
} else {
/* Database does not exists create blank database */
sqliteDatabase = this.getReadableDatabase();
sqliteDatabase.close();
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putInt(SP_KEY_DB_VER, DATABASE_VERSION);
editor.apply();
copyDataBase();
}
}
/** Check Database if it exists */
private boolean databaseExists() {
SQLiteDatabase sqliteDatabase = null;
try {
String databasePath = DB_PATH + DB_NAME;
sqliteDatabase = SQLiteDatabase.openDatabase(databasePath, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
e.printStackTrace();
}
if (sqliteDatabase != null) {
sqliteDatabase.close();
}
return sqliteDatabase != null;
}
/**
* Copy existing database file in system
*/
public void copyDataBase() {
int length;
byte[] buffer = new byte[1024];
String databasePath = DB_PATH + DB_NAME;
try {
InputStream databaseInputFile = this.context.getAssets().open(DB_NAME);
OutputStream databaseOutputFile = new FileOutputStream(databasePath);
while ((length = databaseInputFile.read(buffer)) > 0) {
databaseOutputFile.write(buffer, 0, length);
databaseOutputFile.flush();
}
databaseInputFile.close();
databaseOutputFile.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private static boolean isRoboUnitTest() {
return "robolectric".equals(Build.FINGERPRINT);
}
Solution using Kuffs proposition
#ApplicationScope
public class DatabaseOpenHelper extends DaoMaster.OpenHelper {
private String TAG = DatabaseOpenHelper.class.getSimpleName();
private static final String SP_KEY_DB_VER = "db_ver";
private static final int DATABASE_VERSION = 2;
private Context context;
private SharedPreferences sharedPreferences;
private SQLiteDatabase sqliteDatabase;
private static String DB_PATH;
private static String DB_NAME;
public DatabaseOpenHelper(Context context, SharedPreferences sharedPreferences, String name, SQLiteDatabase.CursorFactory factory) {
super(context, name, factory);
this.context = context;
this.sharedPreferences = sharedPreferences;
DB_NAME = name;
try {
createDataBase();
} catch (Exception ioe) {
throw new Error("Unable to create database");
}
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
/** Open Database for Use */
public void openDatabase() {
String databasePath = context.getDatabasePath(DB_NAME).toString();
sqliteDatabase = SQLiteDatabase.openDatabase(databasePath, null,
(SQLiteDatabase.OPEN_READWRITE));
}
/** Close Database after use */
#Override
public synchronized void close() {
if ((sqliteDatabase != null) && sqliteDatabase.isOpen()) {
sqliteDatabase.close();
}
super.close();
}
/** Get database instance for use */
public SQLiteDatabase getSqliteDatabase() {
return sqliteDatabase;
}
/** Create new database if not present */
public void createDataBase() {
SQLiteDatabase sqliteDatabase;
if (databaseExists()) {
int dbVersion = sharedPreferences.getInt(SP_KEY_DB_VER, 1);
/* If different version then delete current database and copy the new one from assets*/
if (DATABASE_VERSION != dbVersion) {
File dbFile = context.getDatabasePath(DB_NAME);
boolean dbFileDeleted = dbFile.delete();
if (!dbFileDeleted) {
Log.w(TAG, "Unable to update database");
} else {
createDataBase();
}
}
} else {
/* Database does not exists create blank database */
sqliteDatabase = this.getReadableDatabase();
sqliteDatabase.close();
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putInt(SP_KEY_DB_VER, DATABASE_VERSION);
editor.apply();
copyDataBase();
}
}
/** Check Database if it exists */
private boolean databaseExists() {
SQLiteDatabase sqliteDatabase = null;
try {
String databasePath = context.getDatabasePath(DB_NAME).toString();
sqliteDatabase = SQLiteDatabase.openDatabase(databasePath, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLiteException e) {
e.printStackTrace();
}
if (sqliteDatabase != null) {
sqliteDatabase.close();
}
return sqliteDatabase != null;
}
/**
* Copy existing database file in system
*/
public void copyDataBase() {
int length;
byte[] buffer = new byte[1024];
String databasePath = context.getDatabasePath(DB_NAME).toString();
try {
InputStream databaseInputFile = this.context.getAssets().open(DB_NAME);
OutputStream databaseOutputFile = new FileOutputStream(databasePath);
while ((length = databaseInputFile.read(buffer)) > 0) {
databaseOutputFile.write(buffer, 0, length);
databaseOutputFile.flush();
}
databaseInputFile.close();
databaseOutputFile.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
yoh...
I was trying to retrieve data from my external database in assets
but when I run the app, seems like it created another database in /data/data/packagename/databases/ :-( not the external database from assets I inserted and causing an error(Unfortunately, App has stopped). Here's my Code:
ingameinterface .java*
public class ingameinterface extends Activity {
DBHelper dbhelper;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_ingameinterface);
String[] from = new String[] { "CtrlNo", "Prima", "Key_Word", "Val" };
int[] to = new int[] { R.id.itmCc1, R.id.itmCc2, R.id.itemCc3, R.id.itemCc4};
dbhelper = new DBHelper(this);
try {
dbhelper.createDataBase();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Cursor c = dbhelper.getData();
if (c.getCount() == 0) {
showmessage("Error!", "Nothing found.");
return;
}
StringBuffer buff = new StringBuffer();
while (c.moveToNext()) {
buff.append("Controlnum: " + c.getString(0) + "\n");
buff.append("Prima: " + c.getString(1) + "\n");
buff.append("Word: " + c.getString(2) + "\n");
buff.append("Value: " + c.getString(3) + "\n\n");
}
showmessage("Data", buff.toString());
}
public void showmessage(String title, String Message){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setCancelable(true);
builder.setTitle(title);
builder.setMessage(Message);
}
}
and
DBHelper.Java*
public class DBHelper extends SQLiteOpenHelper {
private static String DB_NAME = "db_vocabulary";
private SQLiteDatabase db;
private final Context context;
private String DB_PATH;
public DBHelper(Context context) {
super(context, DB_NAME, null, 1);
this.context = context;
DB_PATH = "/data/data/" + context.getPackageName() + "/" + "databases/";
}
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
if (dbExist) {
} else {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
// throw new Error("Error copying database");
}
}
}
private boolean checkDataBase() {
File dbFile = new File(DB_PATH + DB_NAME);
return dbFile.exists();
}
private void copyDataBase() throws IOException {
InputStream myInput = context.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream myOutput = new FileOutputStream(outFileName);
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 Cursor getData() {
String myPath = DB_PATH + DB_NAME;
db = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READONLY);
Cursor c = db.rawQuery("SELECT * FROM TblWords WHERE Prima = 1", null);
return c;
}
#Override
public void onCreate(SQLiteDatabase arg0) {
// TODO Auto-generated method stub
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
}
use this in your DBHelper.java file:
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table if not exists "+TABLE_NAME+"(PHONENUMBER VARCHAR,NAME VARCHAR)");
}
so that it will wont create another table if already that table exits in database.
I am trying to implement an activity, that has 3 spinners (drop down lists) each of which are populated by a different table from an sqlite database. I managed to create one spinner that is populated correctly, but i am having trouble creating the other two and populating them correctly.
this is my main activity so far:
public class MainActivity extends Activity implements OnClickListener, OnItemSelectedListener {
private DBManager data;
private SQLiteDatabase db;
private final String DB_NAME = "hanakolfein.s3db";
private Spinner spinner;
List<String> list;
ArrayAdapter<String> adapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/*Spinner sp1, sp2, sp3;
sp1 = (Spinner) findViewById(R.id.spinner1);
sp2 = (Spinner) findViewById(R.id.spinner2);
sp3 = (Spinner) findViewById(R.id.spinner3);
sp1.setOnItemSelectedListener(null);
sp2.setOnItemSelectedListener(null);
sp3.setOnItemSelectedListener(null); */
data = new DBManager(this, DB_NAME);
db = data.openDataBase();
spinner = (Spinner) findViewById(R.id.spinner1);
spinner.setOnItemSelectedListener(this);
loadSpinner();
}
private void loadSpinner() {
Set<String> set = data.getAllData();
List<String> list = new ArrayList<String>(set);
adapter = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, list);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setWillNotDraw(false);
}
#Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
and this is my database manager:
public class DBManager extends SQLiteOpenHelper {
//Path to the device folder with databases
public static String DB_PATH;
//Database file name
public static String DB_NAME;
public SQLiteDatabase database;
public final Context context;
public final static int DB_VERSION = 6;
public SQLiteDatabase getDb() {
return database;
}
public DBManager(Context context, String databaseName) {
super(context, databaseName, null, DB_VERSION);
this.context = context;
//full path to the databases
String packageName = context.getPackageName();
DB_PATH = String.format("//data//data//%s//databases//", packageName);
DB_NAME = databaseName;
openDataBase();
}
//This piece of code will create a database if it’s not yet created
public void createDataBase() {
boolean dbExist = checkDataBase();
if (!dbExist) {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
Log.e(this.getClass().toString(), "Copying error");
throw new Error("Error copying database!");
}
} else {
Log.i(this.getClass().toString(), "Database already exists");
}
}
//Performing a database existence check
private boolean checkDataBase() {
SQLiteDatabase checkDb = null;
try {
String path = DB_PATH + DB_NAME;
checkDb = SQLiteDatabase.openDatabase(path, null,SQLiteDatabase.OPEN_READONLY);
} catch (SQLException e) {
Log.e(this.getClass().toString(), "Error while checking db");
}
//Android doesn’t like resource leaks, everything should
// be closed
if (checkDb != null) {
checkDb.close();
}
return checkDb != null;
}
//Method for copying the database
private void copyDataBase() throws IOException {
//Open a stream for reading from our ready-made database
//The stream source is located in the assets
InputStream externalDbStream = context.getAssets().open(DB_NAME);
//Path to the created empty database on your Android device
String outFileName = DB_PATH + DB_NAME;
//Now create a stream for writing the database byte by byte
OutputStream localDbStream = new FileOutputStream(outFileName);
//Copying the database
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = externalDbStream.read(buffer)) > 0) {
localDbStream.write(buffer, 0, bytesRead);
}
//Don’t forget to close the streams
localDbStream.close();
externalDbStream.close();
}
public SQLiteDatabase openDataBase() throws SQLException {
String path = DB_PATH + DB_NAME;
if (database == null) {
createDataBase();
database = SQLiteDatabase.openDatabase(path, null,
SQLiteDatabase.OPEN_READWRITE);
}
return database;
}
#Override
public synchronized void close() {
if (database != null) {
database.close();
}
super.close();
}
public Set<String> getAllData() {
Set<String> set = new HashSet<String>();
String selectQuery = "select * from cuisine";
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
set.add(cursor.getString(1));
} while (cursor.moveToNext());
}
cursor.close();
db.close();
return set;
}
#Override
public void onCreate(SQLiteDatabase db) {}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}
}
Alright, first of all you should not query your database from the main Thread.
I recommend using a Loader as described here. You can have as many Loaders as you like, in your case 1 for each Spinner (just make sure to give them different IDs).
You need to clear that arraylist which you pass to arrayadapter. Because when you use first spinner, you are calling gatAllData & storing that data in arraylist, passing it to arrayadapter. Next time for second spinner you are doing same procedure but it is concatenating to previous entries of arraylist. So before calling to getAllData you need to clear your arraylist. It'll solve your problem.
here is my problem. I am creating my database of text in program called SqliteDbBrowser after that I want to put it into /assets/ folder in android and load it to the application.
All the tutorials assume that you don't have any database and you create it clean from application and then fill it.
I have already put data into my database and don't want to create new one.
Here is some guy's tutorial http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/ and it somehow work's but it's not perfect, is it any other way to solve this ? Using ony SQLiteOpenHelper not mixing stuff?
public void getDataBaseData() {
// /PawnStorescopy.db
if (!new File("/data/data/" + this.getPackageName()
+ "/PawnStorescopy.sqlite").exists()) {
try {
FileOutputStream out = new FileOutputStream("data/data/"
+ this.getPackageName() + "DatabaseName.sqlite");
InputStream in = getAssets().open("DatabaseName.db");
byte[] buffer = new byte[1024];
int readBytes = 0;
while ((readBytes = in.read(buffer)) != -1)
out.write(buffer, 0, readBytes);
in.close();
// out.close();
} catch (IOException e) {
}
}
SQLiteDatabase sqliteDB = SQLiteDatabase.openOrCreateDatabase(
"/data/data/" + this.getPackageName()
+ "/DatabaseName.sqlite", null);
Cursor cursor = sqliteDB.rawQuery("SELECT * FROM TableName", null);
if (cursor.moveToFirst()) {
do {
////Get Data
} while (cursor.moveToNext());
imageFilter(listDatabase);
}
}
I don't see the problem. I used that same example and it worked.
In my project I had to check and, eventually, load the missing tables on the internal DB.
The DB will not be erased, unless you state so.
Therefore adding new tables will not erase any pre-existing ones.
Anyway, you said 'it somehow work's but it's not perfect', what do you mean? It either copies the tables or it doesn't. Right?
The example you provided a link for works well, but the best practice is to build your database within your android application, so you can export the ready database DLL with the data as insert statements, add those insert statements in a file let say under your raw folder and after creating the DB you can read the insert statements and execute them to have your data inserted.
First Put your Created Database in your Asset Folder.
Add Below Java File to your Project
package com.app.ourforms.database;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Vector;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DBConnect extends SQLiteOpenHelper {
ArrayList<String> arraylistUrl;
public int GetCursor;
public DBConnect(Context context, String db_name) {
super(context, db_name, null, 2);
if (db != null && db.isOpen())
close();
this.myContext = context;
DB_NAME = db_name;
try {
createDataBase();
openDataBase();
} catch (IOException e) {
// System.out.println("Exception in creation of database : "+
// e.getMessage());
e.printStackTrace();
}
}
public void createDataBase() throws IOException {
// boolean dbExist = checkDataBase();
boolean dbExist = databaseExist();
if (dbExist) {
// System.out.println("Database Exist");
} else {
this.getReadableDatabase();
try {
copyDatabase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
private void copyDatabase() throws IOException {
InputStream input = myContext.getAssets().open(DB_NAME);
String outputFileName = DB_PATH + DB_NAME;
OutputStream output = new FileOutputStream(outputFileName);
byte[] buffer = new byte[1024];
int length;
while ((length = input.read(buffer)) > 0) {
output.write(buffer, 0, length);
}
// Close the streams
output.flush();
output.close();
input.close();
// System.out.println(DB_NAME + "Database Copied !");
}
#Override
public void onCreate(SQLiteDatabase db) {
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void openDataBase() throws SQLException {
// Open the database
String myPath = DB_PATH + DB_NAME;
db = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
}
public boolean isOpen() {
if (db != null)
return db.isOpen();
return false;
}
#Override
public synchronized void close() {
if (db != null)
db.close();
super.close();
}
public boolean databaseExist() {
File dbFile = new File(DB_PATH + DB_NAME);
return dbFile.exists();
}
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH + DB_NAME;
// System.out.println("My Pathe is:- " + myPath);
// System.out.println("Open");
checkDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.OPEN_READWRITE);
// System.out.println("checkDB value:" + checkDB);
// System.out.println("My Pathe is:- " + myPath);
} catch (Exception e) {
// database does't exist yet.
}
if (checkDB != null) {
// System.out.println("Closed");
checkDB.close();
// System.out.println("My db is:- " + checkDB.isOpen());
}
return checkDB != null ? true : false;
}
public Cursor execCursorQuery(String sql) {
Cursor cursor = null;
try {
cursor = db.rawQuery(sql, null);
GetCursor = cursor.getCount();
Log.i("Inside execCursorQuery try", sql);
} catch (Exception e) {
Log.i("Inside execCursorQuery exception", e.getMessage());
}
return cursor;
}
public void execNonQuery(String sql) {
try {
db.execSQL(sql);
// Log.d("SQL", sql);
} catch (Exception e) {
// Log.e("Err", e.getMessage());
} finally {
// closeDb();
}
}
// ****************** Declare all the global variable
// ****************************//
private Context myContext;
public String DB_PATH = "data/data/com.app.ourforms/databases/"; // path
// of
// your
// datbase
public static String DB_NAME = "OurForms.sqlite";// your database
// name
#SuppressWarnings("unused")
private static String ASSETS_DB_FOLDER = "db";
private SQLiteDatabase db;
public Vector<ArrayList<String>> getQuestion(String Query) {
Vector<ArrayList<String>> alldata = new Vector<ArrayList<String>>();
ArrayList<String> Question = new ArrayList<String>();
ArrayList<String> Option1 = new ArrayList<String>();
ArrayList<String> Option2 = new ArrayList<String>();
ArrayList<String> Option3 = new ArrayList<String>();
ArrayList<String> Option4 = new ArrayList<String>();
ArrayList<String> Option5 = new ArrayList<String>();
ArrayList<String> correct = new ArrayList<String>();
ArrayList<String> correctness = new ArrayList<String>();
ArrayList<String> Description = new ArrayList<String>();
Cursor alldata_ques = execCursorQuery(Query);
// GetCursor = alldata_ques.getCount();
if (alldata_ques != null) {
Log.e("Cursor length", "" + alldata_ques.getCount());
GetCursor = alldata_ques.getCount();
if (alldata_ques.getCount() > 0)
while (alldata_ques.moveToNext()) {
Question.add((alldata_ques.getString(alldata_ques
.getColumnIndex("Question"))));
Option1.add(alldata_ques.getString(alldata_ques
.getColumnIndex("A")));
Option2.add(alldata_ques.getString(alldata_ques
.getColumnIndex("B")));
Option3.add(alldata_ques.getString(alldata_ques
.getColumnIndex("C")));
Option4.add(alldata_ques.getString(alldata_ques
.getColumnIndex("D")));
Option5.add(alldata_ques.getString(alldata_ques
.getColumnIndex("E")));
correct.add(alldata_ques.getString(alldata_ques
.getColumnIndex("Answer")));
correctness.add(alldata_ques.getString(alldata_ques
.getColumnIndex("Correctness")));
Description.add(alldata_ques.getString(alldata_ques
.getColumnIndex("Description")));
}
alldata.add(Question);
alldata.add(Option1);
alldata.add(Option2);
alldata.add(Option3);
alldata.add(Option4);
alldata.add(Option5);
alldata.add(correct);
alldata.add(correctness);
alldata.add(Description);
// Log.d("VECTORSIZE", String.valueOf(alldata.size()));
}
return alldata;
}
public Vector<ArrayList<String>> getQuestions(String Query) {
Vector<ArrayList<String>> alldata = new Vector<ArrayList<String>>();
ArrayList<String> Question = new ArrayList<String>();
ArrayList<String> Option1 = new ArrayList<String>();
ArrayList<String> Option2 = new ArrayList<String>();
ArrayList<String> Option3 = new ArrayList<String>();
ArrayList<String> Option4 = new ArrayList<String>();
ArrayList<String> Option5 = new ArrayList<String>();
ArrayList<String> correct = new ArrayList<String>();
ArrayList<String> Description = new ArrayList<String>();
Cursor alldata_ques = execCursorQuery(Query);
if (alldata_ques != null) {
Log.e("Cursor length", "" + alldata_ques.getCount());
if (alldata_ques.getCount() > 0)
GetCursor = alldata_ques.getCount();
while (alldata_ques.moveToNext()) {
Question.add((alldata_ques.getString(alldata_ques
.getColumnIndex("Question"))));
Option1.add(alldata_ques.getString(alldata_ques
.getColumnIndex("A")));
Option2.add(alldata_ques.getString(alldata_ques
.getColumnIndex("B")));
Option3.add(alldata_ques.getString(alldata_ques
.getColumnIndex("C")));
Option4.add(alldata_ques.getString(alldata_ques
.getColumnIndex("D")));
Option5.add(alldata_ques.getString(alldata_ques
.getColumnIndex("E")));
correct.add(alldata_ques.getString(alldata_ques
.getColumnIndex("Answer")));
Description.add(alldata_ques.getString(alldata_ques
.getColumnIndex("Description")));
}
alldata.add(Question);
alldata.add(Option1);
alldata.add(Option2);
alldata.add(Option3);
alldata.add(Option4);
alldata.add(Option5);
alldata.add(correct);
alldata.add(Description);
// Log.d("VECTORSIZE", String.valueOf(alldata.size()));
}
return alldata;
}
}
In Above Code Change below line as per your project:
public String DB_PATH = "data/data/YOUR_PACKAGE_NAME/databases/"; // path of your datbase
public static String DB_NAME = "OurForms.sqlite";// your database Name
Inside your Activity Write Below Code For First Time Copy your Database to Application.
// For Database Copy
myPrefs = getSharedPreferences("myPrefs", 0);
// sharedPreferences = PreferenceManager
// .getDefaultSharedPreferences(getApplicationContext());
Data.FIRST_TIME_LAUNCH = myPrefs.getBoolean("FIRST_TIME_LAUNCH", true);
if (Data.FIRST_TIME_LAUNCH) {
Log.i(TAG, "FIRST TIME*************************");
dbConnect = new DBConnect(getApplicationContext(),
"OurForms.sqlite");
SharedPreferences.Editor editor = myPrefs.edit();
editor.putBoolean("FIRST_TIME_LAUNCH", false);
editor.commit();
}
Hope it will help you.
Follow this link:
https://github.com/jgilfelt/android-sqlite-asset-helper
Then,
Add your yourSqliteDb.db to folder in assets/databases. Create the folders if not present.
assets/databases/yourSqliteDb.db
How to create asset folder:
http://code2care.org/2015/create-assets-folder-in-android-studio/
Create SQLiteAssetHelper Class as:
public class MyDatabaseHelper extends SQLiteAssetHelper {
private static final String DATABASE_NAME = "yourSqliteDb.db";
private static final int DATABASE_VERSION = 1;
public MyDatabase(Context mContext)
{
super(mContext, DATABASE_NAME, null, DATABASE_VERSION );
}
public Cursor getItems()
{
SQLiteDatabase db = getReadableDatabase();
Cursor c = db.rawQuery("Select * from items", null);
//items is a column name in your table in database
c.moveToFirst();
return c;
}
}
Now in MainActivity or wherever you need to read data from database,
MyDatabaseHelper myDbHelper = new MyDatabaseHelper(this);
SQLiteDatabase db = myDbHelper.ReadableDatabase();
String items = getResult(1); //number value from database table
public String getResult(int id)
{
String name = null;
try
{
Cursor c = null;
c = db.rawQuery("select item from items where _id="+id, null);
c.moveToFirst();
name = c.getString(c.getColumnIndex("item"));
c.close();
}
catch(Exception e)
{
e.printStackTrace();
}
return name;
}