How to handle the click event in Listview in android

Question

The below is my testing code to create the list view  the list view display successfully  however  there is error in click event  I would like to create an intent to send a hardcode message to an new activity  However  it show error for the line   Intent intent   new Intent context  SendMessage class     So   the problem is   what should I provide for this class    Also   instead of hard code the output message  how to capture the data in list view row and pass to the new activity  e g  BBB AAA R drawable tab1 hdpi for the first row   Thanks   public class MainActivity extends Activity       public final static String EXTRA MESSAGE    com example ListViewTest MESSAGE         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main           ArrayList lt ListEntry gt  members   new ArrayList lt ListEntry gt              members add new ListEntry  BBB   AAA  R drawable tab1 hdpi            members add new ListEntry  ccc   ddd  R drawable tab2 hdpi            members add new ListEntry  assa   cxv  R drawable tab3 hdpi            members add new ListEntry  BcxsadvBB   AcxdxvAA             members add new ListEntry  BcxvadsBB   AcxzvAA             members add new ListEntry  BcxvBB   AcxvAA             members add new ListEntry  BvBB   AcxsvAA             members add new ListEntry  BcxvBB   AcxsvzAA             members add new ListEntry  Bcxadv   AcsxvAA             members add new ListEntry  BcxcxB   AcxsvAA             ListView lv    ListView findViewById R id listView1           Log i  testTag   before start adapter            StringArrayAdapter ad   new StringArrayAdapter  members this           Log i  testTag   after start adapter            Log i  testTag   set adapter            lv setAdapter ad           lv setOnItemClickListener new OnItemClickListener                  Override             public void onItemClick AdapterView lt   gt  parent  View view  int position                      long id                    Intent intent   new Intent context  SendMessage class                   String message    abc                   intent putExtra EXTRA MESSAGE  message                   startActivity intent

User · Answer

According to my test    implements OnItemClickListener -  works   setOnItemClickListener -  works  ListView is clickable by default  API 19    The important thing is   click  only works to TextView  if you choose simple list item 1 xml as item   That means if you provide text data for the ListView   click  works when you click on text area  Click on empty area does not trigger  click event

User · Answer

First  the class must implements the click listenener    implements OnItemClickListener   Then set a listener to the ListView  yourList setOnItemclickListener this     And finally  create the clic method    Override public void onItemClick AdapterView lt   gt  parent  View view  int position  long id    Toast makeText MainActivity this   You Clicked at        Toast LENGTH SHORT  show

User · Answer

get main activity     final Activity main activity getActivity           list view click listener     final ListView listView    ListView  inflatedView findViewById R id listView id       listView setOnItemClickListener new AdapterView OnItemClickListener              Override         public void onItemClick AdapterView lt   gt  parent  View view  int position  long id                String stringText                 in normal case             stringText    TextView view  getText   toString                                   in case if listview has separate item layout             TextView textview  TextView view findViewById R id textview id of listview Item               stringText textview getText   toString                                   show selected             Toast makeText main activity  stringText  Toast LENGTH LONG  show                             populate listview

User · Answer

ListView has the Item click listener callback  You should set the onItemClickListener in the ListView  Callback contains AdapterView and position as parameter  Which can give you the ListEntry    lv setOnItemClickListener new OnItemClickListener                  Override             public void onItemClick AdapterView lt   gt  parent  View view  int position                      long id                    ListEntry entry   ListEntry  parent getAdapter   getItem position                   Intent intent   new Intent MainActivity this  SendMessage class                   String message   entry getMessage                    intent putExtra EXTRA MESSAGE  message                   startActivity intent

User · Answer

Error is coming in your code from this statement as you said  Intent intent   new Intent context  SendMessage class     This is due to you are providing context of OnItemClickListener anonymous class into the Intent constructor but according to constructor of Intent  android content Intent Intent Context packageContext  Class lt   gt  cls    You have to provide context of you activity in which you are using intent that is the MainActivity class context  so your statement which is giving error will be converted to  Intent intent   new Intent MainActivity this  SendMessage class     Also for sending your message from this MainActivity to SendMessage class please see below code  lv setOnItemClickListener new OnItemClickListener                  Override             public void onItemClick AdapterView lt   gt  parent  View view  int position                      long id                    ListEntry entry   ListEntry  parent getAdapter   getItem position                   Intent intent   new Intent MainActivity this  SendMessage class                   intent putExtra EXTRA MESSAGE  entry getMessage                     startActivity intent                               Please let me know if this helps you  EDIT - If you are finding some issue to get the value of list do one thing declear your array list  ArrayList lt ListEntry gt  members   new ArrayList lt ListEntry gt       globally i e  before oncreate and change your listener as below   lv setOnItemClickListener new OnItemClickListener                      Override                 public void onItemClick AdapterView lt   gt  parent  View view  int position                          long id                        Intent intent   new Intent MainActivity this  SendMessage class                       intent putExtra EXTRA MESSAGE  members get position                        startActivity intent                                       So your whole code will look as  public class MainActivity extends Activity       public final static String EXTRA MESSAGE    com example ListViewTest MESSAGE   ArrayList lt ListEntry gt  members   new ArrayList lt ListEntry gt           Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            members add new ListEntry  BBB   AAA  R drawable tab1 hdpi            members add new ListEntry  ccc   ddd  R drawable tab2 hdpi            members add new ListEntry  assa   cxv  R drawable tab3 hdpi            members add new ListEntry  BcxsadvBB   AcxdxvAA             members add new ListEntry  BcxvadsBB   AcxzvAA             members add new ListEntry  BcxvBB   AcxvAA             members add new ListEntry  BvBB   AcxsvAA             members add new ListEntry  BcxvBB   AcxsvzAA             members add new ListEntry  Bcxadv   AcsxvAA             members add new ListEntry  BcxcxB   AcxsvAA             ListView lv    ListView findViewById R id listView1           Log i  testTag   before start adapter            StringArrayAdapter ad   new StringArrayAdapter  members this           Log i  testTag   after start adapter            Log i  testTag   set adapter            lv setAdapter ad           lv setOnItemClickListener new OnItemClickListener                          Override                     public void onItemClick AdapterView lt   gt  parent  View view  int position                              long id                            Intent intent   new Intent MainActivity this  SendMessage class                           intent putExtra EXTRA MESSAGE  members get position  getMessage                             startActivity intent                                                     Where getMessage   will be a getter method specified in your ListEntry class which you are using to get message which was previously set

User · Answer

I can not see where do you declare context  For the purpose of the intent creation you can use MainActivity this   lv setOnItemClickListener new OnItemClickListener                  Override             public void onItemClick AdapterView lt   gt  parent  View view  int position                      long id                    Intent intent   new Intent MainActivity this  SendMessage class                   String message    abc                   intent putExtra EXTRA MESSAGE  message                   startActivity intent                               To retrieve the object upon you have clicked you can use the AdapterView   ListEntry entry    ListEntry  parent getItemAtPosition position

[android] How to handle the click event in Listview in android?

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