I have a HashMap<String, String> item
and I need to get all of the keys from it in an array so I can do this:
for (String s : mapKeys)
{
Log.d("MyString", s);
}
How can I do this? Thanks!
for (String s : item.keySet()) {
Log.d("MyString", s);
}
You need to use Map#keySet
method that gives you a Set
of keys
in HashMap: -
Map<String, String> map = new HashMap<String, String>();
for(String key: map.keySet()) {
Log.d("MyString", key);
}
There is keySet
method in the Map
interface. To obtain an array (as you mention in your question) you could use
item.keySet().toArray(new String[item.size()])
But you could just as easily iterate over the keySet
itself,
for (String s : item.keySet()) {
...
}
try:
for (String key : myHashMap.keySet()) {
}
As mentioned in comment check out http://developer.android.com/reference/java/util/HashMap.html#keySet () which return the Set
of keys. You can run a for loop over the keys Set
like following:
for (String s : item.keySet()) {
Log.d("hashmap_keys", s);
}
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