Setting a spinner onClickListener in Android

Question

I m trying to get an onClickListener to fire on a Spinner  but I get the following error      Java lang RuntimeException is  Don t call setOnClickListener for an AdapterView  You probably want setOnItemClickListener instead     I m sure I want to call onClickListener and NOT onItemClickListener  I found a question asked by someone else on Stack Overflow  Is there a way to use setOnClickListener with an Android Spinner   The answer stated there is      You will have to set the Click   listener on the underlying view    normally a TextView with id    android R id text1  of the spinner  To   do so       Create a custom Spinner In the   constructor  with attributes  create   the spinner by supplying the layout   android R layout simple spinner item   Do a findViewById android R id text1    to get the TextView Now set the   onClickListener to the TextView   I have tried the answer noted there  but it doesn t seem to work  I get a null pointer to the TextView after I do the findViewById     This is what I m doing   Spinner spinner    Spinner  findViewById R id spinner   ArrayAdapter lt String gt  adapter   new ArrayAdapter lt String gt  this R layout layoutspinner dataArray    spinner setAdapter adapter    TextView SpinnerText    TextView findViewById R id spinnerText   if  SpinnerText    null        System out println  Not found      else       SpinnerText setOnClickListener new View OnClickListener              Override         public void onClick View arg0                  Do something                       File layoutspinner xml   lt  xml version  1 0  encoding  utf-8   gt   lt TextView     xmlns android  http   schemas android com apk res android                    android id    id spinnerText                    android singleLine   true                    android layout width  fill parent                    android layout height  wrap content                    android textSize  6pt                    android gravity  right   gt    What am I doing wrong   I m new to Stack nbsp Overflow  I didn t find any way to post an aditional question to the other thread  or comment since I have to little rep  so I started a new question   Per recomendation I tried this   int a   spinnerMes getCount    int b   spinnerMes getChildCount    System out println  Count       a   System out println  ChildCount       b   for  int i   0  i  lt  b  i          View v   spinnerMes getChildAt i       if  v    null            System out println  View not found              else           v setOnClickListener new View OnClickListener                  Override             public void onClick View v                      Click code                                     But LogCat isn t showing promising results   10-14 16 09 08 127  INFO System out 3116   Count   7 10-14 16 09 08 127  INFO System out 3116   ChildCount   0   I have tested this on API levels 7 and 8 with the same results

User · Answer

First of all  a spinner does not support item click events  Calling this method will raise an exception   You can use setOnItemSelectedListener   Spinner s1  s1    Spinner findViewById R id s1   int selectionCurrent   s1 getSelectedItemPosition     spinner setOnItemSelectedListener new OnItemSelectedListener              Override         public void onItemSelected AdapterView lt   gt  parentView  View selectedItemView  int position  long id                if  selectionCurrent    position                      Your code here                           selectionCurrent  position                        Override     public void onNothingSelected AdapterView lt   gt  parentView               Your code here

User · Answer

I suggest that all events for Spinner are divided on two types    User events  you meant as  click  event   Program events    I also suggest that when you want to catch user event you just want to get rid off  program events   So it s pretty simple   private void setSelectionWithoutDispatch Spinner spinner  int position        AdapterView OnItemSelectedListener onItemSelectedListener   spinner getOnItemSelectedListener        spinner setOnItemSelectedListener null       spinner setSelection position  false       spinner setOnItemSelectedListener onItemSelectedListener       There s a key moment  you need setSelection position  false    false  in animation parameter will fire event immediately  The default behaviour is to push event to event queue

User · Answer

Here is a working solution   Instead of setting the spinner s OnClickListener  we are setting OnTouchListener and OnKeyListener   spinner setOnTouchListener Spinner OnTouch   spinner setOnKeyListener Spinner OnKey     and the listeners   private View OnTouchListener Spinner OnTouch   new View OnTouchListener         public boolean onTouch View v  MotionEvent event            if  event getAction      MotionEvent ACTION UP                doWhatYouWantHere                      return true           private static View OnKeyListener Spinner OnKey   new View OnKeyListener         public boolean onKey View v  int keyCode  KeyEvent event            if  keyCode    KeyEvent KEYCODE DPAD CENTER                doWhatYouWantHere                return true            else               return false

User · Answer

The following works how you want it  but it is not ideal   public class Tester extends Activity        String   vals      here    are    some    values         Spinner spinner           Called when the activity is first created          Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main           spinner    Spinner  findViewById R id spin           ArrayAdapter lt String gt  ad   new ArrayAdapter lt String gt  this  android R layout simple dropdown item 1line  vals           spinner setAdapter ad           Log i          spinner getChildCount             Timer t   new Timer            t schedule new TimerTask                   Override             public void run                     int a   spinner getCount                    int b   spinner getChildCount                    System out println  Count      a                   System out println  ChildCount      b                   for  int i   0  i  lt  b  i                          View v   spinner getChildAt i                       if  v    null                            System out println  View not found                          else                           v setOnClickListener new View OnClickListener                                   Override                             public void onClick View v                                            Log i     click                                                                                                                                           500             Let me know exactly how you need the spinner to behave  and we can work out a better solution

User · Answer

Personally  I use that       final Spinner spinner    Spinner   view findViewById R id userList        spinner setOnItemSelectedListener new AdapterView OnItemSelectedListener              Override         public void onItemSelected AdapterView lt   gt  parent  View view  int position  long id                                 userSelectedIndex   position                      Override         public void onNothingSelected AdapterView lt   gt  parent

User · Answer

Whenever you have to perform some action on the click of the Spinner in Android  use the following method   mspUserState setOnTouchListener new OnTouchListener           Override     public boolean onTouch View v  MotionEvent event            if  event getAction      MotionEvent ACTION UP                doWhatIsRequired                      return false              One thing to keep in mind is always to return False while using the above method  If you will return True then the dropdown items of the spinner will not be displayed on clicking the Spinner

User · Answer

The Spinner class implements DialogInterface OnClickListener  thereby effectively hijacking the standard View OnClickListener   If you are not using a sub-classed Spinner or don t intend to  choose another answer    Otherwise just add the following code to your custom Spinner    Override     Override triggered on  tap  of closed Spinner    public boolean performClick              Do anything you like here       return super performClick        Example  Display a pre-supplied hint via Snackbar whenever the Spinner is opened    private String sbMsg null          Message seen by user when Spinner is opened  public void setSnackbarMessage String msg    sbMsg msg     Override     Override triggered on  tap  of closed Spinner    public boolean performClick         if  sbMsg  null  amp  amp   sbMsg isEmpty         issue Snackbar          return super performClick          A custom Spinner is a terrific starting point for programmatically standardising Spinner appearance throughout your project   If interested  looky here

[java] Setting a spinner onClickListener() in Android

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