Chip Group OnCheckedChangeListener() not triggered

Question

I\'m trying to make a recyclerview filter based ChipGroup & Chip

I\'m use fragment on my app, so, the fragment who contain the RecyclerView contain a fr

Answer 1

Your code is fine the only issue is that setOnCheckedChangeListener() only work when your ChipGroup is for singleSelection

Read this documentation of ChipGroup

setOnCheckedChangeListener()

• Register a callback to be invoked when the checked chip changes in this group.
• This callback is only invoked in single selection mode.

ALSO READ

Handling Checked Chips

Call setOnCheckedChangeListener(OnCheckedChangeListener) to register a callback to be invoked when the checked chip changes in this group. This callback is only invoked in single selection mode.

if you want use setOnCheckedChangeListener() of ChipGroup than you need to make app:singleSelection="true"

UPDATE

based on your below comment i have added sample code to manage to handle when ChipGroup selection

SAMPLE CODE for maintain selection in ChipGroup

Layout.xml

Activity code

public class Main3Activity extends AppCompatActivity {

    public ChipGroup chipGroup;
    public Button btnShowResult;
    public ArrayList booleanArrayList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);

        chipGroup = findViewById(R.id.chipGroup);
        btnShowResult = findViewById(R.id.btnShowResult);


        btnShowResult.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                for (int i = 0; i < booleanArrayList.size(); i++) {
                    Log.e("RESULT", i + " :" + booleanArrayList.get(i));
                }
            }
        });

        for (int i = 0; i < 5; i++) {

            Chip chip = new Chip(this);
            chip.setId(i);
            chip.setTag(i);

            booleanArrayList.add(false);
            chip.setText("Chip No : " + i);
            chip.setCheckable(true);

            chip.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton compoundButton, boolean b) {

                    int tag = (int) compoundButton.getTag();
                    booleanArrayList.set(tag, b);

                }
            });
            chipGroup.addView(chip);

        }

        chipGroup.invalidate();


        chipGroup.setOnCheckedChangeListener(new ChipGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(ChipGroup chipGroup, int i) {

                Chip chip = chipGroup.findViewById(i);


                if (chip != null)
                    Toast.makeText(getApplicationContext(), "Chip is " + chip.getText().toString(), Toast.LENGTH_SHORT).show();

                Log.e("OnCheckedChangeListener", "Called");
            }
        });

    }

    ChipGroup.OnCheckedChangeListener onCheckedChangeListener = new ChipGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(ChipGroup chipGroup, int i) {

        }
    };

}

For more information please check below articles

• Chips: Material Components for Android
• Android P: Chips and ChipGroup
• Exploring the v28 Android Design Support Library Additions