How to get the selected item from ListView

Question

in my Android app I have created a ListView component called myList  and filled it with  objects of my own custom type   class MyClass       private String displayName      private String theValue        here constructor  getters  setters and toString   are implemented      I used the ArrayAdapter to bound the ArrayList theObjects with myList   ArrayAdapter lt MyClass gt  adapter                   new ArrayAdapter lt MyClass gt  this  R layout lay item  theObjects   myList setAdapter adapter     This works fine  the list is populated and etc   but when I m trying to access the selected item  i receive a Null object  I ve done this using   myList setOnItemClickListener new OnItemClickListener         public void onItemClick AdapterView lt   gt  adapter  View v  int position  long id     MyClass selItem    MyClass  myList getSelectedItem       String value  selItem getTheValue      getter method      What seems to be the problem  Thank you

User · Answer

Though I am using kotlin  the following code answered your question  This return selected item   val item   myListView adapter getItem i  toString     The following is the whole selecteditem Listener  myListView setOnItemClickListener object   OnItemClickListener          override fun onItemClick parent  AdapterView lt   gt   view  View  i  Int                          id  Long               val item   myListView adapter getItem i  toString                      The code returns the item clicked by its index i as shown in the code

User · Answer

On onItemClick    String text   parent getItemAtPosition position  toString

User · Answer

You are implementing the Click Handler rather than Select Handler  A List by default doesn t suppose to have selection    What you should change  in your above example  is to   public void onItemClick AdapterView lt   gt  adapter  View v  int position  long id        MyClass item    MyClass  adapter getItem position

User · Answer

By default  when you click on a ListView item it doesn t change its state to  selected   So  when the event fires and you do   myList getSelectedItem      The method doesn t have anything to return  What you have to do is to use the position and obtain the underlying object by doing   myList getItemAtPosition position

User · Answer

Since the onItemClickLitener   will itself provide you the index of the selected item  you can simply do a getItemAtPosition i  toString    The code snippet is given below  -      listView setOnItemClickListener new AdapterView OnItemClickListener              Override         public void onItemClick AdapterView lt   gt  adapterView  View view  int i  long l                 String s   listView getItemAtPosition i  toString                 Toast makeText activity getApplicationContext    s  Toast LENGTH LONG  show                adapter dismiss       If you want to close the adapter                     On the method above  the i parameter actually gives you the position of the selected item

User · Answer

MyClass selItem    MyClass    myList getSelectedItem         You never instantiated your class

User · Answer

In touch mode  there is no focus and no selection  Your UI should use a different type of widget  such as radio buttons  for selection   The documentation on ListView about this is terrible  just one obscure mention on setSelection

User · Answer

Using setOnItemClickListener is the correct answer  but if you have a keyboard you can change selection even with arrows  no click is performed   so  you need to implement also setOnItemSelectedListener    myListView setOnItemSelectedListener new AdapterView OnItemSelectedListener                  Override             public void onItemSelected AdapterView lt   gt  adapterView  View view  int position  long l         MyObject tmp  MyObject  adapterView getItemAtPosition position                           Override             public void onNothingSelected AdapterView lt   gt  adapterView                       your stuff

User · Answer

myList setOnItemClickListener new OnItemClickListener       public void onItemClick AdapterView lt   gt  adapter  View v  int position  long id          MyClass selItem    MyClass  adapter getItem position

[android] How to get the selected item from ListView?

Examples related to android

Examples related to listview