游标适配器中的 IF 语句？

Question

private void datafill()
{
        Cursor notesCursor = mDbHelper.fetchAllNotes();
        startManagingCursor(notesCursor);

        /* JournalRowId is the row id from the first database containing all journal names
        All notes are kept in database 2. I want only the notes that correspond to each 
        journal to be listed, KEY_HOMEID is the non visible field that shows where 
        each note came from.

         * 
         */
       if (editjournalDbAdapter.KEY_HOMEID == journalRowId){
        String[] from =  new String[]{editjournalDbAdapter.KEY_HEIGHT};

        int[] to = new int[]{R.id.detail1};
      }
            //Error here "from" and "to" are not defined outside of if statement
        SimpleCursorAdapter notes = 
            new SimpleCursorAdapter(this, R.layout.journaldetailrow, notesCursor, from, to);
        setListAdapter(notes);
    }

Answer 1

“from”和“to”仅存在于 if() 语句的范围内。无论如何，否则没有多大意义 - 即使它们这样做，它们的内容也将是未定义的（或者，对于 Java，为 null）并立即使您的应用程序崩溃。

我不知道您想要完成什么，但您可能还希望 if() 块内有底部的两个语句。