[英]Clear ArrayList and do notifyDataSetChanged in adapter ListView from fragment
如何清除ArrayList
並從片段中在適配器ListView
進行notifyDataSetChanged()
?
這是我的快捷方式代碼:
public class ConnectionsFragment {
public onClick() {
// do clear data and notify it (from ListView), how?!
}
private class ArrayAdapter extends BaseAdapter {
ArrayList<ConnectionsModel> data;
// constructor saves received data to `data`
// public view `getView()` displays it
}
}
而且我想清除數據並在片段類的onClick()
之后通知我完成了它(或者甚至更容易清除ListView
直到我從API讀取新數據-所以我想在從API讀取時清除ListView
)。 。
只需在適配器中創建一個公共方法,並將該變量設為私有,以防止不必要的編輯或清除該變量:
private ArrayList<ConnectionsModel> mData;
public onClick() {
// do clear data and notify it (from ListView), how?!
clearData();
}
public void clearData() {
mData.clear();
// do something else here if you want. Like some kind of visual notification to the user
notifyDataSetChanged();
}
如果您的onclick方法在創建適配器的片段中(在本示例中稱為mAdapter),則onclick將為:
public onClick() {
// do clear data and notify it (from ListView), how?!
mAdapter.clearData();
}
如果您的getView()
方法是從data
ArrayList中提取的,則您應該能夠調用data.clear();
然后notifyDataSetChanged();
從您的ArrayAdapter
類中
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