Retrieving an element from array list in Android

Question

I am trying to implement voice recognition code in Android  How do I get an element at a particular position from array list in Android  I tried converting arraylist to array and retriving  Still the code is not working   package com espeaker        public class EspeakerActivity extends Activity                        private static final int REQUEST CODE   1234              private ListView wordsList                    Called when the activity is first created                  Override             public void onCreate Bundle savedInstanceState                      super onCreate savedInstanceState                     setContentView R layout main                       Button speakButton    Button  findViewById R id speakButton                      wordsList    ListView  findViewById R id list                         Disable button if no recognition service is present                   PackageManager pm   getPackageManager                      List lt ResolveInfo gt  activities   pm queryIntentActivities                            new Intent RecognizerIntent ACTION RECOGNIZE SPEECH   0                     if  activities size      0                                            speakButton setEnabled false                         speakButton setText  Recognizer not present                                                      Handle the action of the button being clicked             public void speakButtonClicked View v                startVoiceRecognitionActivity                          Fire an intent to start the voice recognition activity              private void startVoiceRecognitionActivity                 Intent intent   new Intent RecognizerIntent ACTION RECOGNIZE SPEECH           intent putExtra RecognizerIntent EXTRA LANGUAGE MODEL                  RecognizerIntent LANGUAGE MODEL FREE FORM           intent putExtra RecognizerIntent EXTRA PROMPT   Voice recognition Demo               startActivityForResult intent  REQUEST CODE                         Handle the results from the voice recognition activity               Override     protected void onActivityResult int requestCode  int resultCode  Intent data                if  requestCode    REQUEST CODE  amp  amp  resultCode    RESULT OK                           Populate the wordsList with the String values the recognition engine thought it heard             ArrayList lt String gt  matches   data getStringArrayListExtra                      RecognizerIntent EXTRA RESULTS               wordsList setAdapter new ArrayAdapter lt String gt  this  android R layout simple list item 1                      matches                String   array matches toArray new String matches size                    ArrayList lt String gt  places   new ArrayList lt String gt                         Arrays asList  black    blue    red                 ArrayAdapter lt String gt  adapter   new ArrayAdapter lt String gt  this  R layout list item matches                 final AutoCompleteTextView input text    AutoCompleteTextView  findViewById R id auto                 Button button1    Button  findViewById R id button1                        input text setAdapter adapter               button1 setText     array 0                   button1 setText    matches                          super onActivityResult requestCode  resultCode  data

User · Answer

In arraylist you have a positional order and not a nominal order  so you need to know in advance the element position you need to select or you must loop between elements until you find the element that you need to use  To do this you can use an iterator and an if  for example   Iterator iter   list iterator    while  iter hasNext             if here               System out println  string     iter next

User · Answer

What I understand your question is that you want to fetch an element in an ArrayList at a specific location   Suppose your list contains Integers 1 2 3 4 5 and you want to fetch the value 3  Then the following lines of code will work   ArrayList lt Integer gt  list   new ArrayList lt Integer gt             if list contains 3     check if the list contains the element             list get list indexOf 3     get the element by passing the index of the element             Either ways you could use list get list lastIndexOf 3

User · Answer

public class DemoActivity extends Activity           Called when the activity is first created         ArrayList lt String gt  al   new ArrayList lt String gt           Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main                 add elements to the array list          al add  C            al add  A            al add  E            al add  B            al add  D            al add  F                retrieve elements from array          String data   al get pass the index here           System out println  Data is    data     This is another way of getting element          Iterator lt String gt  it   al iterator            while  it hasNext                  System out println  Data is    it next

User · Answer

U cant try this   for  WordList i   words         words get words indexOf i

User · Answer

Maybe the following helps you   arraylistname get position

User · Answer

I have a list of positions of array to retrieve  This worked for me     public void create list to add group ArrayList lt Integer gt  arrayList loc           In my case arraylist loc is the list of positions to retrive from         contact names        arraylist and phone number arraylist      ArrayList lt String gt  group members list   new ArrayList lt  gt         ArrayList lt String gt  group members phone list   new ArrayList lt  gt          int size   arrayList loc size         for  int i   0  i  lt  size  i               try                int loc   arrayList loc get i               group members list add contact names list get loc                group members phone list add phone num list get loc                catch  Exception e                e printStackTrace                           Log e  Group memnbers list         group members list       Log e  Group memnbers num list         group members phone list

[android] Retrieving an element from array list in Android?

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