Android - Get Value from Hashmap

Android - Get value from HashMap

Iterator myVeryOwnIterator = meMap.keySet().iterator();
while(myVeryOwnIterator.hasNext()) {
    String key=(String)myVeryOwnIterator.next();
    String value=(String)meMap.get(key);
    Toast.makeText(ctx, "Key: "+key+" Value: "+value, Toast.LENGTH_LONG).show();
}

How to print all key and values from HashMap in Android?

First, there are errors in your code, ie. you are missing a semicolon and a closing parenthesis in the for loop.

Then, if you are trying to append values to the view, you should use textview.appendText(), instead of .setText().

There's a similar question here: how to change text in Android TextView

android get value of HashMap array

Try this:

for (Map<String, String> menuItem : menuItems) {
    int latitude = Integer.parseInt(menuItem.get(KEY_LAT));
    int longitude = Integer.parseInt(menuItem.get(KEY_LON));
    itemizedOverlay.addOverlayItem(latitude, longitude, KEY_NAME, makerDefault);
}

Get key from HashMap in Android by position or index

Thanks to @Pentium10 for this answer.
And I little modified it according to my need.

String key="default";
Iterator myVeryOwnIterator = CHILD_NAME_DOB.keySet().iterator();
while(myVeryOwnIterator.hasNext()) {
     key=(String)myVeryOwnIterator.next();
     //String value=(String)meMap.get(key);
     }
Toast.makeText(viewEnterChildExp.getContext(), "Key: "+key , Toast.LENGTH_LONG).show();

I'm getting the last key element by this.

I'll update as soon I also get to find an easy way to key by index.

How to get values and keys from HashMap?

To get all the values from a map:

for (Tab tab : hash.values()) {
    // do something with tab
}

To get all the entries from a map:

for ( Map.Entry<String, Tab> entry : hash.entrySet()) {
    String key = entry.getKey();
    Tab tab = entry.getValue();
    // do something with key and/or tab
}

Java 8 update:

To process all values:

hash.values().forEach(tab -> /* do something with tab */);

To process all entries:

hash.forEach((key, tab) -> /* do something with key and tab */);

How to get the hashmap values?

You can put your answer as HashMap in an Arraylist. That would make all your ArrayList of same size.

For instance,

HashMap<String, String> hm = new HashMap<String, String>();
hm.put("1", "abc");
hm.put("2", "def");
hm.put("3", "ghi");
hm.put("4", "jkl");

ArrayList<HashMap<String, String>> lstAns = new ArrayList<HashMap<String,String>>();
lstAns.add(hm);

To access answers:

System.out.println("answer1 " + lstAns.get(index).get("1")); // gives "abc"

Android: Get single value from Hashmap Arraylist?

Try this :

for (HashMap<String, String> map : IDList)
     for (Entry<String, String> mapEntry : map.entrySet())
        {
        String key = mapEntry.getKey();
        String value = mapEntry.getValue();
        }

For single Element : IDList.get(0).get(key);

HashMapString, ArrayListInteger get value

If map is your HashMap<String, ArrayList<Integer>> then iterate the map and get the third value from the ArrayList and sum it.Try this,

    HashMap<String, ArrayList<Integer>> map = new HashMap<>();
    int sum = 0;
    for (Map.Entry<String, ArrayList<Integer>> item : map.entrySet()) {
        sum += item.getValue().get(2);
    }

How to get key for value from Hashmap in Kotlin?

Using filterValues {}

val map = HashMap<String, String>()
val keys = map.filterValues { it == "your_value" }.keys

And keys will be the set of all keys matching the given value

HashMap - getting First Key value

You can try this:

 Map<String,String> map = new HashMap<>();
 Map.Entry<String,String> entry = map.entrySet().iterator().next();
 String key = entry.getKey();
 String value = entry.getValue();

Keep in mind, HashMap does not guarantee the insertion order. Use a LinkedHashMap to keep the order intact.

Eg:

 Map<String,String> map = new LinkedHashMap<>();
 map.put("Active","33");
 map.put("Renewals Completed","3");
 map.put("Application","15");
 Map.Entry<String,String> entry = map.entrySet().iterator().next();
 String key= entry.getKey();
 String value=entry.getValue();
 System.out.println(key);
 System.out.println(value);

Output:

 Active
 33

Update:
Getting first key in Java 8 or higher versions.

Optional<String> firstKey = map.keySet().stream().findFirst();
if (firstKey.isPresent()) {
    String key = firstKey.get();
}

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