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4

I have an ArrayList object like this:

ArrayList<HashMap<String, String>> data = new ArrayList<HashMap<String, String>>();

How to iterate through the list? I want to display the value in a TextView which comes from the data of ArrayList object.

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2 Answers

up vote 14 down vote accepted

Simplest is to iterate over all the HashMaps in the ArrayList and then iterate over all the keys in the Map:

TextView view = (TextView) view.findViewById(R.id.view);

for (HashMap<String, String> map : data)
     for (Entry<String, String> entry : map.entrySet())
         view.append(entry.getKey() + " => " + entry.getValue());
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For the 2nd iteration I personally prefer to iterate of the map entries, instead of the keys. for (Entry<String, String> entry : map.entrySet()). That way you already both the key and the value, you don't need another map lookup. – Ben van Gompel Oct 7 '11 at 7:02
@BenvanGompel: Good point, depends on your use case, but updated! :) – dacwe Oct 7 '11 at 7:06
up vote 1 down vote

for(HashMap<String, String> map : data){ ... deal with map... }

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