java - 如何从entry.getValue 获取另一个HasMap？

Question

对于每个循环，在entry.getValue()内部，还有另一个来自firestore的 map 。我怎样才能得到？

代码:

  @Override
    public void onComplete (@NonNull Task < QuerySnapshot > task) {
        if (task.isSuccessful()) {
            //   binding.contentMain.noData.setVisibility(View.GONE);
            for (QueryDocumentSnapshot document : Objects.requireNonNull(task.getResult())) {
                showLog("Data: " + document.getData());
                postMap.putAll(document.getData());
            }
            try {
                for (Map.Entry<String, Object> entry : postMap.entrySet()) {
                    if (entry.getKey().equals(CONTENT)) {
                        showLog("value: " + entry.getValue().toString());


                        contentMap = new HashMap<>();
                        contentMap.putAll(entry.getValue());

                    }

                }

            } catch (Exception e) {
                e.printStackTrace();
            }

        } else {
            //  binding.contentMain.noData.setVisibility(View.VISIBLE);
            showLog("Error getting documents: " + task.getException());
        }
    }

我尝试了如下但编译器错误。无建议:

Map map = new HashMap();
((Map)map.get( "keyname" )).get( "nestedkeyname" );

Answer 1

试试这个

contentMap.putAll((Map<? extends String, ? extends Object>) entry.getValue());