How to disable onItemSelectedListener to be invoked when setting selected item by code

Question

Just wondering how you handle the following problem: a result is calculated depending on two spinners\' selected items. To handle the UI things, i.e. a user picks a new item in

Answer 1

    This following method will help you to stop invoking automatically the selection listener


    yourspinnerobj.post(new Runnable() {
                @Override
                public void run() {
                    yourspinnerobj.setOnItemSelectedListener(yourspinnerlistener);
                }
            });

Answer 2

First add boolean values for stopping spinner listener call

  Boolean check = false;

Then you add on Touch listener and on Item click Listener Like below code

 holder.filters.setOnTouchListener(new View.OnTouchListener() {
               @Override
               public boolean onTouch(View v, MotionEvent event) {

                   check = true;
                   return false;
               }
           });

           holder.filters.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
           {

               @Override
               public void onItemSelected(AdapterView<?> parent, View arg1, int position, long id)
               {
                   flag = filterids.get(position);

                   if(check)
                   {
                       check = false;
                       new Applyfilters().execute(flag,"3");
                   }else{

                   }

               }

               @Override
               public void onNothingSelected(AdapterView<?> arg0)
               {
                   // TODO Auto-generated method stub
               }
           });

Its simple working good for stopping server call multiple times.

Answer 3

When Spinner.setSelection(position) is used, it always activates setOnItemSelectedListener()

To avoid firing the code twice I use this solution:

private mIsSpinnerFirstCall=true;

...
Spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        //If a new value is selected (avoid activating on setSelection())
        if(!mIsSpinnerFirstCall) {
            // Your code goes gere
        }
        mIsSpinnerFirstCall = false;
    }

    public void onNothingSelected(AdapterView<?> arg0) {
    }
});

This solution is valid when you are sure that Spinner.setSelection(position) us used. Also, it is important to set mIsSpinnerFirstCall=true each time before using Spinner.setSelection(position)

Answer 4

A cleaner solution, in my opinion, to differentiate between programmatic and user-initiated changes is the following:

Create your listener for the spinner as both an OnTouchListener and OnItemSelectedListener

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) { 
            // Your selection handling code here
            userSelect = false;
        }
    }

}

Add the listener to the spinner registering for both event types

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

This way, any unexpected calls to your handler method due to initialization or re-initialization will be ignored.

Answer 5

Add the OnItemSelectedListener for each spinner after you have set any previous value in onResume.

Answer 6

In my case, since I'm triggering spinner programmatically, then I just have to add spinnerSelected flag after spinner.performClick() like below.

private var spinnerSelected = false

someView.setOnClickListener {
    spinner.performClick()
    spinnerSelected = true
}

spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
    override fun onNothingSelected(parent: AdapterView<*>?) {
        // do nothing
    }

    override fun onItemSelected(
        parent: AdapterView<*>?,
        view: View?,
        position: Int,
        id: Long
    ) {
        if (spinnerSelected) {
            //... do something

            spinnerSelected = false
        }
      }
    }