Populating a ListView using an ArrayList

Question

My Android app needs to populate the ListView using the data from an ArrayList    I have trouble doing this  Can someone please help me with the code

User · Accepted Answer

You need to do it through an ArrayAdapter which will adapt your ArrayList  or any other collection  to your items in your layout  ListView  Spinner etc    This is what the Android developer guide says   A ListAdapter that manages a ListView backed by an array of arbitrary objects  By default this class expects that the provided resource id references a single TextView  If you want to use a more complex layout  use the constructors that also takes a field id  That field id should reference a TextView in the larger layout resource  However the TextView is referenced  it will be filled with the toString   of each object in the array  You can add lists or arrays of custom objects  Override the toString   method of your objects to determine what text will be displayed for the item in the list  To use something other than TextViews for the array display  for instance ImageViews  or to have some of data besides toString   results fill the views  override getView int  View  ViewGroup  to return the type of view you want   So your code should look like  public class YourActivity extends Activity        private ListView lv       public void onCreate Bundle saveInstanceState             setContentView R layout your layout             lv    ListView  findViewById R id your list view id                Instanciating an array list  you don t need to do this               you already have yours            List lt String gt  your array list   new ArrayList lt String gt              your array list add  quot foo quot             your array list add  quot bar quot                 This is the array adapter  it takes the context of the activity as a              first parameter  the type of list view as a second parameter and your              array as a third parameter           ArrayAdapter lt String gt  arrayAdapter   new ArrayAdapter lt String gt                    this                    android R layout simple list item 1                   your array list              lv setAdapter arrayAdapter

User · Answer

Here s an example of how you could implement a list view     Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main          We have our list view     final ListView dynamic   findViewById R id dynamic          Create an array of elements     final ArrayList lt String gt  classes   new ArrayList lt  gt         classes add  Data Structures        classes add  Assembly Language        classes add  Calculus 3        classes add  Switching Systems        classes add  Analysis Tools           Create adapter for ArrayList     final ArrayAdapter lt String gt  adapter   new ArrayAdapter lt  gt  this android R layout simple list item 1  classes          Insert Adapter into List     dynamic setAdapter adapter          set click functionality for each list item     dynamic setOnItemClickListener new AdapterView OnItemClickListener              Override         public void onItemClick AdapterView lt   gt  parent  View view  int position  long id                Log i  User clicked    classes get position

User · Answer

Try the below answer to populate listview using ArrayList     public class ExampleActivity extends Activity       ArrayList lt String gt  movies       public void onCreate Bundle saveInstanceState               super onCreate saveInstanceState          setContentView R layout list              Get the reference of movies        ListView moviesList  ListView findViewById R id listview           movies   new ArrayList lt String gt            getMovies               Create The Adapter with passing ArrayList as 3rd parameter        ArrayAdapter lt String gt  arrayAdapter                          new ArrayAdapter lt String gt  this android R layout simple list item 1  movies             Set The Adapter        moviesList setAdapter arrayAdapter               register onClickListener to handle click events on each item        moviesList setOnItemClickListener new OnItemClickListener                          argument position gives the index of item which is clicked            public void onItemClick AdapterView lt   gt  arg0  View v int position  long arg3                              String selectedmovie movies get position                  Toast makeText getApplicationContext     Movie Selected     selectedmovie    Toast LENGTH LONG  show                                        void getmovies                 movies add  X-Men            movies add  IRONMAN            movies add  SPIDY            movies add  NARNIA            movies add  LIONKING            movies add  AVENGERS

User · Answer

public class Example extends Activity       private ListView lv      ArrayList lt String gt  arrlist new ArrayList lt String gt           let me assume that you are putting the values in this arraylist       Now convert your arraylist to array        You will get an exmaple here        http   www java-tips org java-se-tips java lang how-to-convert-an-arraylist-into-an-array html       private String arr   convert arrlist        Override     public void onCreate Bundle bun                super onCreate bun           setContentView R layout main           lv  ListView findViewById R id lv           lv setAdapter new ArrayAdapter lt String gt  this android R layout simple list item 1   arr

User · Answer

tutorial  Also look up ArrayAdapter interface   ArrayAdapter Context context  int textViewResourceId  List lt T gt  objects

[java] Populating a ListView using an ArrayList?

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