My guess is that these apps are using an already SQLite database with all the data they need already populated.
You can import populated databases to your app with something like this :
public class DataBaseAdapter {
String DB_NAME = "DBNAME.db";
String DIR = "/data/data/packageName/databases/";
String DB_PATH = DIR + DB_NAME;
private DataBaseHelper mDbHelper;
private SQLiteDatabase db;
private Context context;
public DataBaseAdapter(Context context) {
this.context = context;
mDbHelper = new DataBaseHelper(this.context);
}
class DataBaseHelper extends SQLiteOpenHelper {
private boolean createDatabase = false;
@SuppressWarnings("unused")
private boolean upgradeDatabase = false;
Context context;
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.context = context;
}
public void initializeDataBase() {
getWritableDatabase();
if (createDatabase) {
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
private void copyDataBase() throws IOException {
InputStream input = context.getAssets().open(DB_NAME);
OutputStream output = new FileOutputStream(DB_PATH);
byte[] buffer = new byte[1024];
int length;
try {
while ((length = input.read(buffer)) > 0) {
output.write(buffer, 0, length);
}
}
finally {
try {
if (output != null) {
try {
output.flush();
} finally {
output.close();
}
}
} finally {
if (input != null) {
input.close();
}
}
}
getWritableDatabase().close();
}
public void onCreate(SQLiteDatabase db) {
createDatabase = true;
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
upgradeDatabase = true;
}
public void onOpen(SQLiteDatabase db) {
super.onOpen(db);
}
}
public DataBaseAdapter open() {
mDbHelper.initializeDataBase();
if (db == null)
db = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
db.close();
}
}
you can then add methods to get data from database and this class can be used in your activity by calling open then the method to get data then close.
