如何存储HashMap <Integer,ArrayList<String> &gt;到SQLite？

Question

I have to store the HashMap value on SQLite with Keyset and reuse when application is restart using shared preference.

HashMap<Integer, ArrayList<String>> hashMap;
hashMap = new HashMap<>();
//Insert Value
hashMap.put(btn.getId(), listValue);
// Read a Value
Map.Entry<Integer, ArrayList<String>> entry = (Map.Entry<Integer,   ArrayList<String>>) iteratorMap.next();

for (Integer ihashId :hashMap.keySet()) {
    if( btnid == ihashId)
     {
       Set<Map.Entry<Integer, ArrayList<String>>> setMap = hashMap.entrySet();
       Iterator<Map.Entry<Integer,  ArrayList<String>>> iteratorMap =  setMap.iterator();
       while (iteratorMap.hasNext()) {
             Map.Entry<Integer, ArrayList<String>> entry = (Map.Entry<Integer, ArrayList<String>>) iteratorMap.next();
             ArrayList<String> values = entry.getValue();
             if (btnId == entry.getKey()) {
               getSetName.setText(values.get(0));
               getSetAddress.setText(values.get(1));
               getSetPin.setText(values.get(2));
               getSetValue.setText(values.get(3));
        }
    }

 }

Answer 1

Original Answer Before Question Edited:
HashMap is already serialized so you can store the HashMap directly on your sqlite database as a BLOB. Although you won't be able to read it's content until you de-serialize it.

EDIT:
You should put long running operations inside an async task. If you want the the reference to your variables to survive configuration changes, you should use a fragment and use setRetainInstance(true) although regardless of keeping your reference to the AsyncTask, it is independent of the UI thread and will keep running.

SIDE NOTE:
Always use manually counted loop when using ArrayList as it has better performance.

As seen in this comparison , using for loop with counter set to the size of the array is significantly faster than for each loop:

private static List<Integer> list = new ArrayList<>();
for(int j = list.size(); j > size ; j--)
{
    //do stuff
}