I'm trying to put this ListView in an alphabetical order by value of WORDS column. I've already read answers on this topic, but nevertheless haven't found any solution. Have I necessarily use Comparable/Comparator?
private ArrayList<HashMap<String, Object>> wordList;
private static final String WORD = "word";
private static final String DEFINITION = "definition";
private static final String NOTES = "notes";
private SimpleAdapter adapter;
ListView listView = (ListView) findViewById(R.id.listView);
final ListView listView2 = (ListView) findViewById(R.id.listView2);
wordList = new ArrayList<>();
HashMap<String, Object> hm;
for (int i = word_counter - 1; i >= 0; i--) {
hm = new HashMap<>();
hm.put(WORD, words[i]);
hm.put(DEFINITION, definitions[i]);
hm.put(NOTES, notes[i]);
wordList.add(hm);
}
adapter = new SimpleAdapter(this, wordList,
R.layout.list_item, new String[]{WORD, DEFINITION, NOTES},
new int[]{R.id.text1, R.id.text2, R.id.text3});
For auto sorting the data use TreeSet. TreeSet is a Collection in which the data you enter into it will be sorted regardless of the order you entered data into it.
TreeSet ts=new TreeSet();
for (int i=0;i<words.length;i++)
{
ts.add(words[i]+"-|-"+definitions[i]+"-|-"+notes[i]);
}
Iterator<String> itr=ts.iterator();
while(itr.hasNext()){
System.out.println(itr.next());
}
The output will be in ascending order. From here, just split the string you get from the TreeSet using "-|-" as parameter for split(). And use each elements as you need.