如何使用 HashMap 并在 ArrayAdapter 中使用它以在微调器中显示值

Question

I have a HashMap which contains a key and value, both of which are strings. I am getting the HashMap from a different activity. I am trying to use the HashMap and put it into an array adapter so I can display a spinner with the values of the HashMap. I have tried to iterate through the HashMap and haven't had any luck.

HashMap<String, String> examCodesMap = (HashMap<String, String>) MainActivity.examCodesMap;

Answer 1

HashMap<String, String> examCodesMap = new HashMap<String, String>();
Spinner spinner = (Spinner) findViewById(R.id.spinner);
ArrayList<String> arrayList = new ArrayList<>();

for(Map.Entry<String, HashMap> entry : selects.entrySet()) {
    String key = entry.getKey();
    String value = entry.getValue();

    arrayList.add(value);
}

ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.spinner, arrayList);