public class MainActivity extends Activity {
    SqlHelper sqlHelper;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second_activity);

        sqlHelper = new SqlHelper(this);
        Log.e("1: ", "" + sqlHelper.getWritableDatabase().isOpen());
        sqlHelper.getWritableDatabase().close();
        Log.e("2: ", "" + sqlHelper.getWritableDatabase().isOpen());
    }
}

public class SqlHelper extends SQLiteOpenHelper {
    Context c;

    public SqlHelper(Context context) {
        super(context, "base", null, 1);
        this.c = context;
    }

    @Override
    public void onCreate(SQLiteDatabase sqLiteDatabase) {
        StringBuilder stringBuilderWeather = new StringBuilder()
                .append("CREATE TABLE WEATHER")
                .append(" (")
                .append("_id")
                .append(" INTEGER PRIMARY KEY AUTOINCREMENT, ")
                .append("LALALA")
                .append(" INTEGER);");
        sqLiteDatabase.execSQL(stringBuilderWeather.toString());
    }

    @Override
    public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i2) {
    }
}