Question

我有这段代码：

cursor = tbDispositivos.fetchAll();
if(cursor.getCount() > 0){
    TextView emptyText = (TextView) findViewById(android.R.id.empty);
    emptyText.setVisibility(View.GONE);
}
adapter = new DispositivosCursorAdapter(this, cursor);  

dispositivosList = (ListView) findViewById(android.R.id.list);  
dispositivosList.setAdapter(adapter);  

cursorCount = cursor.getCount();
listViewCount = dispositivosList.getCount();

listViewCount比cursorCount大1。为什么呢？

Answer 1

cursor.getCount() // number of data items in the cursor
adapter.getCount() // number of data items passed in by the cursor (or at least that is what a custom adapter should report)
listview.getCount() // number of data items from the adapter + a header and/or footer view

因此，使用页眉或页脚会使listview.getCount（）比cursor.getCount（）大1。如果同时使用页眉和页脚，那么它将大于2。

为什么ListView.getCount（）比Cursor.getCount（）大1

1 个答案: