"There is no default constructor available in android.database.sqlite.SQLitepenhelper" in Android Studio

You need to define an explicit constructor yourself that calls the 4- or 5-arg super constructor in SQLiteOpenHelper.

For example:

public DbHelper(Context context) {    super(context, "database.db", null, 1);}

where database.db is your database file name and 1 is the version.

If your DBHelper child then this post help, othervise you can allready understandfirst Define it like this one in outside of you class, means uperside...

private DBHelper ourHelper;private final Context ourContext;

Then use this

class DbHelper extends SQLiteOpenHelper {public DBHelper(Context context) {        super(context, DB_NAME, null, DB_VIRSION);        // TODO Auto-generated constructor stub    }@Overridepublic void onCreate(SQLiteDatabase db) {    db.execSQL(Category.getSql());    db.execSQL(Note.getSql());    db.execSQL(Attachment.getSql());    db.execSQL(CheckItem.getSql());}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {    db.execSQL("DROP TABLE IF EXISTS " + Category.TABLE_NAME);   db.execSQL("DROP TABLE IF EXISTS " + Note.TABLE_NAME);    db.execSQL("DROP TABLE IF EXISTS " + Attachment.TABLE_NAME);    db.execSQL("DROP TABLE IF EXISTS " + CheckItem.TABLE_NAME);    onCreate(db);}

And then try this context for your parent class

public MyDatabase(Context c){    ourContext=c;}