android - closing Cursor in SQLite database explicitly, needed or not needed? -

i understand after database closed, cursor becomes "invalid", close cursor @ same time? avoid having shown below?

example 1

 public void string getresultsandreturnstring() {       string result = "";       sqlitedatabase db = dbhelper.getreadabledatabase();       cursor cursor = qb.query(db, projection, null, null,                     null, null, null);       cursor.close();  <-- explicit cursor close example 1       db.close();      return result;   } 

example 2

public void cursor getresultsandreturncursor(){    sqlitedatabase db = dbhelper.getreadabledatabase();    cursor cursor = qb.query(db, projection, null, null,                     null, null, null);    return cursor; }  public void closeout(cursor cursor, sqlitedatabase database){      cursor.close();   <-- explicit cursor close example 2      database.close(); } 

the cursor isn't closed in strict sense closing database (it's still there , can perform operations on it), know, closing database makes cursor useless. should close cursors explicitly after you're done using them number of reasons:

1) noted, after closing database, remaining cursors become "invalid," , cannot relied upon accurate data;

2) see warnings in logcat;

3) risk memory leaks if maintain reference cursor; and

4) it's programming practice close out resources no longer need.