How to extract list of arraylist of hashmap and loop through it in android?

Question

I have an list of arraylist of hashmap as below. Could you please help me on how loop through it inorder to get the key and compare the key with particular data, if it matches display its respective value.

List<ArrayList<HashMap>> li = new ArrayList<ArrayList<HashMap>>();
    li = SyncSettings.labelSharedInstance;

Below is the list of arraylist of hashmap storage view (and for reference i have added xml as well).

<labels>
        <label id="lblMS">
            <text language="EN" value="Morning Sync"/>
            <text language="DE" value="Morgan Sync"/>
        </label>
        <label id="lblES">
            <text language="EN" value="Evening Sync"/>
            <text language="DE" value="Sync Abend"/>
        </label>
        <label id="lblAS">
            <text language="EN" value="Afternoon Sync"/>
            <text language="DE" value="Sync Afternoon"/>
        </label>
    </labels>

Initially, i will be getting the device language and i need to check the device language with language in the hashmap. If it matches i need to display it respective language.

So far what i have achieved is as below.

for (ArrayList<HashMap> entry : li) {
        Set<String> keys = entry.keySet();
        for (String key : keys) {
         //I'm just seeing whether i'm doing in a right way or not. So i was just printing.But i was getting nothing 
            System.out.println("key = " + key);
            System.out.println("value = " + value);
        }

Could you please help me to proceed further. Thank you.

subhash · Accepted Answer · 2015-09-29 05:03:44Z

1

Assuming provided xml, following data structure can be created:

    List<ArrayList<HashMap<String, String>>> listSuper = new ArrayList<>();//List of label in your xml

    ArrayList<HashMap<String, String>> listInner = new ArrayList<>();//Correspond to a label in your xml

    HashMap<String, String> hashMapLblMs = new HashMap<>();
    hashMapLblMs.put("EN", "Morning Sync");
    hashMapLblMs.put("DE", "Morgan Sync");
    listInner.add(hashMapLblMs);

    HashMap<String, String> hashMaplblES = new HashMap<>();
    hashMaplblES.put("EN", "Evening Sync");
    hashMaplblES.put("DE", "Sync Abend");
    listInner.add(hashMaplblES);

    listSuper.add(listInner);

Now we can iterate in this by using for loop:

for (int i = 0; i < listSuper.size(); i++) {
        ArrayList<HashMap<String, String>> listInner1 = listSuper.get(i);
        for (HashMap<String, String> map : listInner1) {
            for (Map.Entry<String, String> entrySet : map.entrySet()) {
                System.out.println("key = " + entrySet.getKey());
                System.out.println("value = " + entrySet.getValue());
            }
        }
    }

answered Sep 29, 2015 at 5:03

subhash

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1 Comment

coders Over a year ago

@subhash.Hello Subhash, Thanks for replying. As per my list, Key is labelId-->lblMS and value-->language="EN" value="Morning Sync" as per my hashmap. Let me say, i pass label as paramter from outside, if the passed label id matches the key's labelid, i need to fetch the value. How can i achieve this?

KishuDroid · Accepted Answer · 2015-09-29 04:26:12Z

1

    ArrayList<HashMap<String, String>> arrayList;
    ArrayList<String> lblMSList, lblASList, lblESList;
    arrayList = new ArrayList<HashMap<String, String>>();

    lblMSList= new ArrayList<String>();
    lblASList= new ArrayList<String>();
    lblESList= new ArrayList<String>();

    arrayList = getAllData();

    if (arrayList.size() != 0)
        {
            for (int i = 0; i < arrayList.size(); i++)
            {
                lblMSList.add(arrayList.get(i).get("lblMS"));
                lblASList.add(arrayList.get(i).get("lblES"));
                lblESList.add(arrayList.get(i).get("lblAS"));
            }
        }

Hope it helps.

answered Sep 29, 2015 at 4:26

KishuDroid

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3 Comments

coders Over a year ago

Thanks a lot for replying Kishu. I will check and let you know

coders Over a year ago

Can you explain what you doing. I didn't get. You are declaring a list lists for all again and adding to them.

KishuDroid Over a year ago

I have fetch data from Hashmap and put it in the arraylist because we have multiple data for the same key.

Diksha Dhiman · Accepted Answer · 2015-09-29 05:06:05Z

1

    ArrayList<ArrayList<HashMap<String, String>>> li = new ArrayList<>();
    for (ArrayList<HashMap<String, String>> myList : li) {
        for (HashMap<String, String> myMap : myList) {
            for (String key : myMap.keySet()) {
                Log.e("key: ", "is " + key);
                Log.e("value: ", "is " + myMap.get(key));
            }
        }
    }

Please try it this way!

answered Sep 29, 2015 at 5:06

Diksha Dhiman

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S. K · Accepted Answer · 2015-09-29 04:21:32Z

0

Check below Code:

List<ArrayList<HashMap<String, String>>> li = new ArrayList<ArrayList<HashMap<String, String>>>();

//Outer loop to get arraylist of list
for(int i = 0; i < li.size(); i++){

ArrayList<HashMap<String, String>> temp_list=li.get(i);

//inner loop to get hashMap for each entry inside arraylist 
for (Entry<String, String> mapEntry : temp_list.get(i).entrySet()) {
                    String key = mapEntry.getKey();
                    String value = mapEntry.getValue();
                    // Log.d("LIST:", "" + key + "::" + value);

                }


}

answered Sep 29, 2015 at 4:21

S. K

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1 Comment

coders Over a year ago

Thank you S.K. I will check and let you know

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