Android Spinner Avoid onItemSelected calls during initialization

Question

I created an Android application with a Spinner and a TextView  I want to display the selected item from the Spinner s drop down list in the TextView  I implemented the Spinner in the onCreate method so when I m running the program  it shows a value in the TextView  before selecting an item from the drop down list     I want to show the value in the TextView only after selecting an item from the drop down list  How do I do this   Here is my code    import android app Activity  import android os Bundle  import android view View  import android widget AdapterView  import android widget AdapterView OnItemSelectedListener  import android widget ArrayAdapter  import android widget Spinner  import android widget TextView   public class GPACal01Activity extends Activity implements OnItemSelectedListener           Called when the activity is first created          Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main            Spinner spinner    Spinner  findViewById R id noOfSubjects               Create an ArrayAdapter using the string array and a default spinner layout         ArrayAdapter lt CharSequence gt  adapter   ArrayAdapter createFromResource this R array noofsubjects array  android R layout simple spinner item              Specify the layout to use when the list of choices appears         adapter setDropDownViewResource android R layout simple spinner dropdown item              Apply the adapter to the spinner         spinner setAdapter adapter           spinner setOnItemSelectedListener this              public void onItemSelected AdapterView lt   gt  parent  View arg1  int pos long id            TextView textView    TextView  findViewById R id textView1           String str    String  parent getItemAtPosition pos           textView setText str              public void onNothingSelected AdapterView lt   gt  arg0               TODO Auto-generated method stub

User · Answer

The user interaction flag can then be set to true in the onTouch method and reset in onItemSelected() once the selection change has been handled. I prefer this solution because the user interaction flag is handled exclusively for the spinner, and not for other views in the activity that may affect the desired behavior.

In code:

Create your listener for the spinner:

public class SpinnerInteractionListener implements AdapterView.OnItemSelectedListener, View.OnTouchListener {

    boolean userSelect = false;

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        userSelect = true;
        return false;
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        if (userSelect) { 
            userSelect = false;
            // Your selection handling code here
        }
    }

}

Add the listener to the spinner as both an OnItemSelectedListener and an OnTouchListener:

SpinnerInteractionListener listener = new SpinnerInteractionListener();
mSpinnerView.setOnTouchListener(listener);
mSpinnerView.setOnItemSelectedListener(listener);

User · Answer

create a boolean field        private boolean inispinner    inside oncreate of the activity      spinner setOnItemSelectedListener new AdapterView OnItemSelectedListener              Override         public void onItemSelected AdapterView lt   gt  parent  View view  int position  long id                if   inispinner                    inispinner   true                  return                              do your work here                     Override         public void onNothingSelected AdapterView lt   gt  parent

User · Answer

You can do this by this way   AdapterView OnItemSelectedListener listener   new AdapterView OnItemSelectedListener              Override         public void onItemSelected AdapterView lt   gt  adapterView  View view  int i  long l                  set the text of TextView                     Override         public void onNothingSelected AdapterView lt   gt  adapterView                        yourSpinner setOnItemSelectedListener new AdapterView OnItemSelectedListener              Override         public void onItemSelected AdapterView lt   gt  adapterView  View view  int i  long l                yourSpinner setOnItemSelectedListener listener                       Override         public void onNothingSelected AdapterView lt   gt  adapterView                         At first I create a listener and attributed to a variable callback  then i create a second listener anonymous and when this is called at a first time  this change the listener

User · Answer

I placed a TextView on top of the Spinner  same size and background as the Spinner  so that I would have more control over what it looked like before the user clicks on it  With the TextView there  I could also use the TextView to flag when the user has started interacting  My Kotlin code looks something like this  private var mySpinnerHasBeenTapped   false  private fun initializeMySpinner          my hint text view setOnClickListener           mySpinnerHasBeenTapped   true   turn flag to true         my spinner performClick     call spinner click              Basic spinner setup stuff     val myList   listOf  quot Leonardo quot    quot Michelangelo quot    quot Rafael quot    quot Donatello quot       val dataAdapter  ArrayAdapter lt String gt    ArrayAdapter lt String gt  this  android R layout simple spinner dropdown item  myList      my spinner adapter   dataAdapter      my spinner onItemSelectedListener   object   OnItemSelectedListener            override fun onItemSelected parent  AdapterView lt   gt    view  View  position  Int  id  Long                 if  mySpinnerHasBeenTapped      code below will only run after the user has clicked                 my hint text view visibility   View GONE   once an item has been selected  hide the textView                   Perform action here                                  override fun onNothingSelected parent  AdapterView lt   gt                    Do nothing                    Layout file looks something like this  with the important part being that the Spinner and TextView share the same width  height  and margins           lt FrameLayout             android layout width  quot match parent quot              android layout height  quot wrap content quot  gt                lt Spinner                 android id  quot   id my spinner quot                  android layout width  quot match parent quot                  android layout height  quot 35dp quot                  android layout marginStart  quot 10dp quot                  android layout marginEnd  quot 10dp quot                  android background  quot  drawable bg for spinners quot                   android paddingStart  quot 8dp quot                  android paddingEnd  quot 30dp quot                  android singleLine  quot true quot    gt                lt TextView                 android id  quot   id my hint text view quot                  android layout width  quot match parent quot                  android layout height  quot 35dp quot                                  android layout marginStart  quot 10dp quot                  android layout marginEnd  quot 10dp quot                  android background  quot  drawable bg for spinners quot                   android paddingStart  quot 8dp quot                  android paddingEnd  quot 30dp quot                  android singleLine  quot true quot                  android gravity  quot center vertical quot                  android text  quot  Select A Turtle quot                  android textColor  quot  color green ooze quot                  android textSize  quot 16sp quot    gt            lt  FrameLayout gt   I m sure the other solutions work where you ignore the first onItemSelected call  but I really don t like the idea of assuming it will always be called

User · Answer

spinner setOnItemSelectedListener this      Will call onItemSelected   Listener    So first time handle this with any Integer value  Example   Initially Take int check   0   public void onItemSelected AdapterView lt   gt  parent  View arg1  int pos long id       if   check  gt  1          TextView textView    TextView  findViewById R id textView1         String str    String  parent getItemAtPosition pos         textView setText str            You can do it with boolean value and also by checking current and previous positions  See here

User · Answer

This worked for me       spinner setSelection 0  false       new Handler   postDelayed new Runnable                  Override             public void run                     spinner setOnItemSelectedListener listener                  500

User · Answer

Just put this line before set OnItemSelectedListener  spinner setSelection 0 false

User · Answer

Beginning with API level 3 you can use onUserInteraction   on an Activity with a boolean to determine if the user is interacting with the device   http   developer android com reference android app Activity html onUserInteraction     Override public void onUserInteraction          super onUserInteraction         userIsInteracting   true      As a field on the Activity I have    private boolean userIsInteracting    Finally  my spinner         mSpinnerView setOnItemSelectedListener new OnItemSelectedListener                  Override            public void onItemSelected AdapterView lt   gt  arg0  View view  int position  long arg3                    spinnerAdapter setmPreviousSelectedIndex position                   if  userIsInteracting                         updateGUI                                                Override            public void onNothingSelected AdapterView lt   gt  arg0                              As you come and go through the activity the boolean is reset to false   Works like a charm

User · Answer

My solution   protected boolean inhibit spinner   true     Override         public void onItemSelected AdapterView lt   gt  arg0  View arg1                  int pos  long arg3                 if  inhibit spinner                    inhibit spinner   false               else                if  getDataTask    null  getDataTask cancel true               updateData

User · Answer

You could achieve it by setOnTouchListener first then setOnItemSelectedListener in onTouch   Override public boolean onTouch final View view  final MotionEvent event     view setOnItemSelectedListener this   return false

User · Answer

Try this  spinner postDelayed new Runnable              Override         public void run                 addListeners                     1000   o

User · Answer

To avoid calling spinner setOnItemSelectedListener   during initialization  spinner setSelection Adapter NO SELECTION  true     Add this line before setting listener spinner setOnItemSelectedListener new AdapterView OnItemSelectedListener          Override     public void onItemSelected AdapterView lt   gt  parent  View view  int position  long id                 Override     public void onNothingSelected AdapterView lt   gt  parent

User · Answer

This worked for me   Spinner s initialization in Android is problematic sometimes the above problem was solved by this pattern   Spinner setAdapter    Spinner setSelected false       must Spinner setSelection 0 true      must Spinner setonItemSelectedListener this     Setting adapter should be first part and onItemSelectedListener this  will be last  when initializing a spinner  By the pattern above my OnItemSelected   is not called during initialization of spinner

User · Answer

For me  Abhi s solution works great up to Api level 27   But it seems that from Api level 28 and upwards  onItemSelected   is not called when listener is set  which means onItemSelected   is never called   Therefore  I added a short if-statement to check Api level   public void onItemSelected AdapterView lt   gt  parent  View arg1  int pos long id                 if Build VERSION SDK INT  gt   28     onItemSelected   doesn t seem to be called when listener is set on Api 28                  check   1                             if   check  gt  1                      Do your action here                           I think that s quite weird and I m not sure wether others also have this problem  but in my case it worked well

User · Answer

Had the same problem and this works for me   I have 2 spinners and I update them during init and during interactions with other controls or after getting data from the server   Here is my template   public class MyClass extends  lt Activity Fragment Whatever gt  implements Spinner OnItemSelectedListener        private void removeSpinnersListeners             spn1 setOnItemSelectedListener null           spn2 setOnItemSelectedListener null              private void setSpinnersListeners             new Handler   postDelayed new Runnable                  Override             public void run                     spn1 setOnItemSelectedListener MyClass this                   spn2 setOnItemSelectedListener MyClass this                            1               Override     public void onItemSelected AdapterView lt   gt  parent  View view  int position  long id               Your code here             Override     public void onNothingSelected AdapterView lt   gt  parent               When the class is initiating use setSpinnersListeners   instead of directly setting the listener   The Runnable will prevent the spinner from firing onItemSelected right after the you set their values   If you need to update the spinner  after a server call etc   use removeSpinnersListeners   right before your update lines  and setSpinnersListeners   right after the update lines  This will prevent onItemSelected from firing after the update

User · Answer

haha   I have the same question  When initViews   just do like this The sequence is the key  listener is the last  Good Luck    spinner setAdapter adapter   spinner setSelection position   spinner setOnItemSelectedListener listener

User · Answer

Based on Abhi s answer i made this simple listener  class SpinnerListener constructor private val onItemSelected   position  Int  - gt  Unit    AdapterView OnItemSelectedListener        private var selectionCount   0      override fun onNothingSelected parent  AdapterView lt   gt                no op            override fun onItemSelected parent  AdapterView lt   gt    view  View   position  Int  id  Long            if  selectionCount    gt  1               onItemSelected position

User · Answer

Similar simple solution that enables multiple spinners is to put the AdapterView in a collection - in the Activities superclass - on first execution of onItemSelected      Then check to see if the AdapterView is in the collection before executing it   This enables one set of methods in the superclass and supports multiple AdapterViews and therefor multiple spinners   Superclass      private Collection lt AdapterView gt  AdapterViewCollection   new ArrayList lt AdapterView gt         protected boolean firstTimeThrough AdapterView parent        boolean firstTimeThrough     AdapterViewCollection contains parent       if  firstTimeThrough           AdapterViewCollection add parent              return firstTimeThrough         Subclass      public void onItemSelected AdapterView lt   gt  parent  View view  int pos  long id          if    firstTimeThrough parent             String value   safeString parent getItemAtPosition pos  toString             String extraMessage   EXTRA MESSAGE          Intent sharedPreferencesDisplayIntent   new         Intent SharedPreferencesSelectionActivity this SharedPreferencesDisplayActivity class       sharedPreferencesDisplayIntent putExtra extraMessage value       startActivity sharedPreferencesDisplayIntent            don t execute the above code if its the first time through      do to onItemSelected being called during view initialization

User · Answer

Code  spinner setOnTouchListener new View OnTouchListener       Override public boolean onTouch View view  MotionEvent motionEvent    isSpinnerTouch true  return false        holder spinner from setOnItemSelectedListener new AdapterView OnItemSelectedListener                  Override             public void onItemSelected AdapterView lt   gt  adapterView  View view  int slot position  long l                    if isSpinnerTouch                                        Log d  spinner from    spinner from                        spinnerItemClickListener onSpinnerItemClickListener position  slot position  AppConstant FROM SLOT ONCLICK CODE                                     else                                                  Override             public void onNothingSelected AdapterView lt   gt  adapterView

[android] Android Spinner : Avoid onItemSelected calls during initialization

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