从列表视图中删除行后刷新片段

Question

我已经创建了一个自定义列表视图，并为每一行添加了一个删除按钮。删除按钮运行良好，当我单击该按钮时，该行将从数据库中删除。问题是，当我删除一行时，它会保留在列表中，直到我通过移动到另一个片段来刷新该片段并返回，然后它从列表中消失。我想要的是，当我删除一行时，它会立即从列表视图中消失。我尝试了一些解决方案来刷新整个片段或删除后的列表视图，但都不起作用！

这是我为适配器类中的删除按钮编写的代码

public View getView(final int position, View convertView, ViewGroup parent) {
View theView = super.getView(position, convertView, parent);     // It took me three days to fix :) I posed a question for it in StackOverFlow
Button deleteButt = (Button) theView.findViewById(R.id.deleteButton);
deleteButt.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// This code to delete a row from the class Orders was taken from Back4app help https://www.back4app.com/docs/android/parse-objects/crud
ParseQuery<ParseObject> query = ParseQuery.getQuery("Orders");
query.whereEqualTo("objectId", mainObjectsArray.get(position)[3]);  // mainObjectsArray.get(position)[3] We fetched the object id and stored it in mainObjectArray. position is the position of the item in the list which is the same position of the the same item in the mainObjectArray. Smart isn't it?! :)
query.findInBackground(new FindCallback<ParseObject>() {
@Override
public void done(final List<ParseObject> object, ParseException e) {
if (e == null) {
// The dialog 
AlertDialog.Builder alert = new AlertDialog.Builder(getActivity());
alert.setMessage("Are you sure you want to delete this order?")
.setNegativeButton("No", null)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//Delete based on the position
object.get(0).deleteInBackground(new DeleteCallback() {
@Override
public void done(ParseException e) {
if (e == null) {
Toast.makeText(getActivity(), "Deleted!", Toast.LENGTH_SHORT).show();

} else {
Toast.makeText(
getApplicationContext(),
e.getMessage().toString(),
Toast.LENGTH_LONG
).show();
}
}
});
}
});
alert.create().show();

} else {
Toast.makeText(
getApplicationContext(),
e.getMessage().toString(),
Toast.LENGTH_LONG
).show();
}
};
});
}
});
return theView;
}

之后

Toast.makeText(getActivity(), "Deleted!", Toast.LENGTH_SHORT).show();

我应该写一段代码来刷新片段，以便从数据库中获取新数据。我们会寻求任何帮助！非常感谢。

Answer 1

一旦单击删除按钮，就会从适配器列表中删除该项并使用notifyDataSetChanged()，它将更新您的列表项。你不需要为此更新完整的片段。

编辑：-您可以使用notifyItemRemoved()而不是使用notifyDataSetChanged()，因为这将更新整个recyclerView，这是一个繁重的操作。在这里，您可以找到有关notifyItemRemoved()的更多详细信息。

Answer 2

一旦订单被删除，只需从适配器列表中删除订单并通知适配器。