I am using custom adapter extending cursor adapter for displaying data in listview, to display particular phone number i have passed the id to a method in database class but it is showing 

errorandroid.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0

while placing debugger in the the method it is not going after the line

num = cursor.getString(cursor.getColumnIndex("ContactNumber"));

Can any one help me to solve it. This is the code:

public String getNumberFromId(int id) 
{
    String num;
    db= this.getReadableDatabase();
    Cursor cursor = db.query(scheduletable, new String[] { "ContactNumber" },"_id="+id, null, null, null, null);
    cursor.moveToFirst();
    num = cursor.getString(cursor.getColumnIndex("ContactNumber")); 
    cursor.close();
    db.close();
    return num;
}
android database-cursor
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