Chip Group OnCheckedChangeListener() not triggered
All chips need to have the android:checkable="true" property for the trigger to exist on them.
In adittion to setting the initial check of any chip (without giving a tap), the order of execution must be first the creation of the listener with chipGroup.setOnCheckedChangeListener() and then chip.isChecked = true.
So you could handle the checkable property from the xml and isChecked dynamically.
.xml
<com.google.android.material.chip.ChipGroup
..
app:singleSelection="true">
<com.google.android.material.chip.Chip
..
android:checkable="true"/>
.kt
binding.chipGroup.setOnCheckedChangeListener { chipGroup, i ->
}
binding.firstChip.isChecked = true //default
GL
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
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.chip.ChipGroup
android:id="@+id/chipGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
>
</com.google.android.material.chip.ChipGroup>
</androidx.constraintlayout.widget.ConstraintLayout>
<Button
android:layout_width="match_parent"
android:text="Get Result"
android:id="@+id/btnShowResult"
android:layout_gravity="bottom"
android:layout_height="wrap_content" />
</LinearLayout>
Activity code
public class Main3Activity extends AppCompatActivity {
public ChipGroup chipGroup;
public Button btnShowResult;
public ArrayList<Boolean> 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
Chip Click listener will only work if the single selection was set to true in chipGroup.
app:singleSelection="true"
If you're using the style like below, then make sure it was also given to every individual chip as well.
style="@style/Widget.MaterialComponents.Chip.Choice"
like this:
<com.google.android.material.chip.ChipGroup
android:id="@+id/chip_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginEnd="10dp"
app:singleSelection="true"
style="@style/Widget.MaterialComponents.Chip.Choice">
<com.google.android.material.chip.Chip
android:id="@+id/chip_2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="@style/Widget.MaterialComponents.Chip.Choice"
android:text="@string/announcements"
android:textAppearance="@style/ChipThemeBold"/>
<com.google.android.material.chip.Chip
android:id="@+id/chip_3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="@style/Widget.MaterialComponents.Chip.Choice"
android:text="@string/fyi"
android:textAppearance="@style/ChipThemeBold"/>
<com.google.android.material.chip.Chip
android:id="@+id/chip_4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="@style/Widget.MaterialComponents.Chip.Choice"
android:text="@string/heartbeat"
android:textAppearance="@style/ChipThemeBold" />
<com.google.android.material.chip.Chip
android:id="@+id/chip_5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="@style/Widget.MaterialComponents.Chip.Choice"
android:text="@string/pitch"
android:textAppearance="@style/ChipThemeBold" />
<com.google.android.material.chip.Chip
android:id="@+id/chip_6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="@style/Widget.MaterialComponents.Chip.Choice"
android:text="@string/question"
android:textAppearance="@style/ChipThemeBold"
android:layout_marginEnd="15dp" />
</com.google.android.material.chip.ChipGroup>