Good morning, community, I have the following case, I have 1 list of questions with their respective YES/NO answers, which are the checkboxes, what is complicating me is how I can apply 1 validation that only allows marking 1 answer (yes or no), in turn save that answer with its respective position and then save it in a DB.
this is my adapter(preusoadapter.kt)
class preusoadapter(
private val context : Context,
private val listpreguntaspreuso: ArrayList<epreguntas>
) : RecyclerView.Adapter<preusoadapter.PreUsoViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PreUsoViewHolder {
val layoutInflater = LayoutInflater.from(context)
return PreUsoViewHolder(layoutInflater.inflate(R.layout.activity_estructura_listapreuso, parent, false)
)
}
override fun onBindViewHolder(holder: PreUsoViewHolder, position: Int) {
val item = listpreguntaspreuso[position]
holder.render(item)
holder.displayChecked(item.answer)
if (position == 2) {
holder.displayAnswers(setOf(Answer.IVSS, Answer.DSS))
} else if (position == 6) {
holder.displayAnswers(setOf(Answer.FRESERV, Answer.FREDMANO))
} else if (position == 14) {
holder.displayAnswers(setOf(Answer.NA, Answer.SI, Answer.NO))
} else if (position == 18) {
holder.displayAnswers(setOf(Answer.NA, Answer.SI, Answer.NO))
} else if (position == 22) {
holder.displayAnswers(setOf(Answer.NA, Answer.SI, Answer.NO))
} else if (position == 25) {
holder.displayAnswers(setOf(Answer.NA, Answer.SI, Answer.NO))
}
}
override fun getItemCount(): Int = listpreguntaspreuso.size
//CLASE INTERNA PREUSOVIEWHOLDER//
inner class PreUsoViewHolder(view: View) : RecyclerView.ViewHolder(view) {
val binding = ActivityEstructuraListapreusoBinding.bind(view)
private val idpregunta = view.findViewById<TextView>(R.id.txtidpregunta)
private val numeropregunta = view.findViewById<TextView>(R.id.txtnumeropregunta)
private val pregunta = view.findViewById<TextView>(R.id.txtpreguntas)
private val imgestado = view.findViewById<ImageView>(R.id.icosemaforo)
fun render (epreguntas: epreguntas){
idpregunta.text = epreguntas.id_pregunta
numeropregunta.text = epreguntas.num_pregunta
pregunta.text = epreguntas.pregunta
Glide.with(imgestado.context).load(epreguntas.icono_estado).into(imgestado)
}
private val checkboxAnswers = mapOf(
binding.chbksi to Answer.SI,
binding.chbkno to Answer.NO,
binding.chbkna to Answer.NA,
binding.chbkIVSS to Answer.IVSS,
binding.chbkDSS to Answer.DSS,
binding.chbkFSERV to Answer.FRESERV,
binding.chbkfmano to Answer.FREDMANO
)
init {
// set the listener on all the checkboxes
checkboxAnswers.keys.forEach { checkbox ->
checkbox.setOnClickListener { handleCheckboxClick(checkbox) }
}
}
// A function that handles all the checkboxes
private fun handleCheckboxClick(checkbox: CheckBox) {
// get the item for the position the VH is displaying
val item = listpreguntaspreuso[adapterPosition]
// update the item's checked state with the Answer associated with this checkbox
// If it's just been -unchecked-, then that means nothing is checked
checkboxAnswers[checkbox]?.let { answer ->
item.answer = if (!checkbox.isChecked) null else answer
// remember to notify the adapter (so it can redisplay and uncheck any other boxes)
notifyItemChanged(adapterPosition)
}
}
fun displayChecked(answer: Answer?) {
// set the checked state for all the boxes, checked if it matches the answer
// and unchecked otherwise.
// Setting every box either way clears any old state from the last displayed item
checkboxAnswers.forEach { (checkbox, answerType) ->
checkbox.isChecked = answerType == answer
}
}
fun displayAnswers(answers: Collection<Answer>) {
// iterate over each checkbox/answer pair, hiding or displaying as appropriate
checkboxAnswers.forEach { (checkbox, answerType) ->
checkbox.visibility = if (answerType in answers) View.VISIBLE else View.GONE
}
}
}
}
and this is my class epreguntas.kt
class epreguntas(
var id_pregunta: String,
var num_pregunta: String,
var pregunta : String,
var icono_estado: String,
var checkvalor: Boolean = false,
var answer: Answer? = null
) {
}
this is my structure i use for my recylcview
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:animateLayoutChanges="true"
app:cardCornerRadius="2dp"
app:cardElevation="4dp"
app:cardUseCompatPadding="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:animateLayoutChanges="true"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/icosemaforo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="#drawable/ic_android" />
</RelativeLayout>
<LinearLayout
android:id="#+id/contenedor_categoria1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:orientation="vertical"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<TextView
android:id="#+id/txtnumeropregunta"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:layout_alignParentTop="true"
android:text="N°"
android:textSize="14sp"
android:textStyle="bold" />
<TextView
android:id="#+id/txtpreguntas"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginTop="5dp"
android:layout_marginEnd="20dp"
android:layout_toStartOf="#+id/contenedorcheck"
android:textSize="14sp"
android:layout_toEndOf="#+id/txtnumeropregunta"
android:textStyle="bold"
android:text="Preguntas" />
<LinearLayout
android:id="#+id/contenedorcheck"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:paddingEnd="20dp"
>
<CheckBox
android:id="#+id/chbksi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="#string/check_si" />
<CheckBox
android:id="#+id/chbkIVSS"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:visibility="gone"
android:text="#string/check_IVSS" />
<CheckBox
android:id="#+id/chbkFSERV"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:visibility="gone"
android:text="#string/check_freserv" />
<CheckBox
android:id="#+id/chbkno"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:text="#string/check_no" />
<CheckBox
android:id="#+id/chbkfmano"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:layout_marginEnd="10dp"
android:text="#string/check_fredmano" />
<CheckBox
android:id="#+id/chbkDSS"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:layout_marginEnd="10dp"
android:text="#string/check_DSS" />
<CheckBox
android:id="#+id/chbkna"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:layout_marginEnd="10dp"
android:text="#string/check_na" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
It complies with selecting 1 box and unchecking the other, but I realize that when I check the box for question 1 (yes) another question overlaps and my question 1 is hidden, and I see that in some questions the YES/NO/ NA up to IVSS and DSS
example
Like Tenfour04 says, RadioButtons in a RadioGroup would handle the "only one thing can be selected" functionality. (You'd need a different listener to handle its button id has been selected callbacks.)
But since you're already storing the checked state and displaying it, you can handle that yourself - you just need a way to ensure when one checkbox is checked, the others are stored as unchecked.
An easy way to do that is to store an Int which represents the checkbox that's selected. Say 0 for the first, 1 for the second, and a negative number for none. Because each number represents one checked item, by changing the number you're "unchecking" the others.
If you want to store that in your data object (like with checkvaloryes) you can just do:
class epreguntas(
var id_pregunta: String,
...
var checkvaloryes: Boolean = false,
var id_answer: Int
)
Then your checkbox click listeners just have to store the appropriate value, and in onBindHolder you enable the selected checkbox and disable all the others.
This is basically what using a RadioGroup involves too - you get a button ID when the selection changes (-1 for no selection), you store that, and when you display it you fetch that stored ID and set it on the RadioGroup.
The automatic deselection of other buttons (in single-selection mode) is nice and convenient, but setting the current button in onBindViewHolder will trigger the OnCheckedChangedListener and you can get stuck in a loop, so you'd need to avoid that. One way is to only update your stored value (and notify the adapter of the change) if the current selection ID is different to the stored one.
But you can also use checkboxes and click listeners like you already are, you just have to handle their state yourself. Here's a bit of a long explanation of one way to do it, but it's partly about solving other problems you're probably going to run into.
I'm gonna complicate things a bit, because I feel like it will help you out once you understand what's happening - you have a few things to wrangle here. I'm just posting this as one way to approach that store and display problem.
First, I think it would be a good idea to define your options somewhere. Since you have a fixed set of checkboxes, there's a fixed set of answers, right? You could define those with an enum:
enum class Answer {
SI, NO, IVSS, FRESERV, FREDMANO, DSS, NA
}
And you could store that in your data:
class epreguntas(
...
var answer: Answer? = null // using null for 'no answer selected'
)
(You can use that enum elsewhere in your app too - it means your answer data is in a useful data structure, and it's not tied to some detail about your list display, like what order the checkboxes happen to be added in the layout. If you need to turn these enum constants into an Int, e.g. for storage, you can use their ordinal property)
Now you can connect those responses to the checkboxes that represent them. We could do that in the ViewHolder class:
class PreUsoViewHolder(view: View) : RecyclerView.ViewHolder(view) {
...
// create an answer type lookup for each checkbox in the ViewHolder instance
// I'm going to use your binding object since you have it!
val checkboxAnswers = mapOf(
binding.chbksi to SI,
binding.chbkno to NO,
...
)
That checkboxAnswers map acts as two things - it's a lookup that links each CheckBox in the layout to a specific answer type, and the keys act as a collection of all your CheckBox views, so you can easily do things to all of them together.
Now you can create a click listener that checks which View was clicked, get the matching Answer, and set it:
// I've made this an -inner- class, and it need to be nested inside your Adapter class
// This gives the ViewHolder access to stuff inside the adapter, i.e. listpreguntaspreuso
inner class PreUsoViewHolder(view: View) : RecyclerView.ViewHolder(view) {
init {
...
// set the listener on all the checkboxes
checkboxAnswers.keys.forEach { checkbox ->
checkbox.setOnClickListener { handleCheckboxClick(checkbox) }
}
// A function that handles all the checkboxes
private fun handleCheckboxClick(checkbox: CheckBox) {
// get the item for the position the VH is displaying
val item = listpreguntaspreuso[adapterPosition]
// update the item's checked state with the Answer associated with this checkbox
// If it's just been -unchecked-, then that means nothing is checked
checkboxAnswers[checkbox]?.let { answer ->
item.answer = if (!checkbox.isChecked) null else answer
// remember to notify the adapter (so it can redisplay and uncheck any other boxes)
notifyItemChanged(adapterPosition)
}
}
This relies on you using a click listener, not a checkedChanged listener, because setting checked state in onBindViewHolder (when you're clearing checkboxes) will trigger that checkedChanged listener. A click listener only fires when the user is the one checking or unchecking a box.
So now you have a click listener that sets the appropriate Answer value for an item. To display it, we could put another function in the ViewHolder:
fun displayChecked(answer: Answer?) {
// set the checked state for all the boxes, checked if it matches the answer
// and unchecked otherwise.
// Setting every box either way clears any old state from the last displayed item
checkboxAnswers.forEach { (checkbox, answerType) ->
checkbox.isChecked = answerType == answer
}
}
And now you can call that from onBindViewHolder:
override fun onBindViewHolder(holder: PreUsoViewHolder, position: Int) {
val item = listpreguntaspreuso[position]
holder.render(item)
holder.displayChecked(item.answer)
The other reason for doing things this way, is I think your code to make stuff visible/invisible is broken:
else if (position == 14){
holder.itemView.chbkna.visibility = View.VISIBLE
}
This kind of thing won't work - all you're doing is saying "for item 14, make this box visible" - it says nothing about which of the other boxes should be visible, and which should be hidden. You'll have stuff randomly shown or hidden depending on which item happened to be displayed in that ViewHolder before. You need to explicitly say what should be displayed, every time onBindViewHolder runs.
You can do that with a similar function to the displayChecked one we just wrote:
inner class PreUsoViewHolder(view: View) : RecyclerView.ViewHolder(view) {
...
// provide a list of the answers that should be shown
fun displayAnswers(answers: Collection<Answer>) {
// iterate over each checkbox/answer pair, hiding or displaying as appropriate
checkboxAnswers.forEach { (checkbox, answerType) ->
checkbox.visibility = if (answerType in answers) VISIBLE else GONE
}
}
Now you can easily update your displayed boxes in onBindViewHolder:
else if (position == 14){
holder.displayAnswers(setOf(NA, SI, NO))
}
And even better, you could create groups of answer types associated with the question in the data. So instead of hardcoding by position, you can just pull the required types out of the item itself
class epreguntas(
...
answerTypes: Set<Answer>
// onBindViewHolder
holder.displayAnswers(item.answerTypes)
You could even create preset lists for different types of question, like val yesNo = setOf(SI, NO) (or an enum) and reuse those when defining your questions - there are probably only a few combos you're using anyway!
I hope that wasn't too complicated, and the organisation ideas (and the benefits they can give you) make sense. A RadioGroup is simpler, but with the other stuff you'll probably have to deal with, I feel like this is a useful general approach
I have a custom control with buttons (image) that should update an activity (fragment) control (big 0 string).
May be it is too simple but I don't know how to do it because onClickListener buttons are inside the custom control class. Which is the best approach?
Listener inside custom control class is:
binding.counterSelectorViewPrevious.setOnClickListener(OnClickListener {
decreaseValue()}
fun decreaseValue() {
if (mSelectedIndex > 0) {
val newSelectedIndex = mSelectedIndex - 1
setSelectedIndex(newSelectedIndex)
}
}
Activity control is just a TextView outside of custom control class.
<TextView
android:id="#+id/workout_length"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="0"
android:textAlignment="textEnd"
android:textAppearance="#style/TextAppearance.AppCompat.Display2"
tools:text="99:99:99" />
Thanks in advance.
You need to accept a listener in your custom view what get's some callback from your activity/fragment
something like this
private OnValueChangeListener onValueChangeListener;
public void addOnValueChangeListener(OnValueChangeListener onValueChangeListener)
{
this.onValueChangeListener = onValueChangeListener;
}
public void decreaseValue() {
onValueChangeListener.onValueChange(newValue);
}
public interface OnValueChangeListener {
void onValueChange(int newValue);
}
then you need to add invoke this somewhere in your activity/fragment (like in onCreate/onCreateView)
void setupListener() {
addOnValueChangeListener(newValue -> {
findViewById(R.id.workout_length).setText("" + newValue);
});
}
I'm still new to all this MVVM and Android Architecture Components. I have a few screens (Login and Register) that have inputs for email, password, name etc and a 'continue' button that's only enabled when the required fields are filled out correctly. There's also text views for messages such as "password must be..." and "not a valid email...". I'm trying to use a binding adapter and viewmodel to pull some of this validation logic out of my MainActivity and away from my business logic, but I'm struggling. I'm not even sure if this is the best way to do it. My thought with the ViewModel is that it would hold it's state on rotation/activity changes.
RegisterActivity is an Activity that simply holds a ViewPager with 3 fragments (email/password, first/last name, validation code).
Binding Adapter
#BindingAdapter("app:onTextChanged")
public static void onTextChanged(TextInputEditText view, TextViewBindingAdapter.OnTextChanged listener) {
}
Layout
<TextView
android:id="#+id/tv_error_message"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:text="#string/register_email_requirement"
android:textColor="#color/moenPrimaryError"
android:textSize="18sp"
android:visibility="#{viewModel.emailValidationVisible ? View.VISIBLE: View.GONE}"
app:layout_constraintBottom_toTopOf="#id/input_layout_password"
app:layout_constraintEnd_toEndOf="#+id/input_layout_email_address"
app:layout_constraintStart_toStartOf="#+id/input_layout_email_address"
app:layout_constraintTop_toBottomOf="#+id/input_layout_email_address"
app:layout_goneMarginTop="16dp" />
<com.google.android.material.textfield.TextInputEditText
android:id="#+id/input_email_address"
style="#style/MoenTextInputEditText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
app:onTextChanged="#{viewModel.onTextChanged}"
app:onFocusChange="#{inputLayoutEmailAddress}">
</com.google.android.material.textfield.TextInputEditText>
ViewModel
public class RegisterFragmentViewModel extends BaseObservable {
private boolean emailValidationVisible = false;
#Bindable
public boolean getEmailValidationVisible() {
return this.emailValidationVisible;
}
public void toggle() {
this.emailValidationVisible = !this.emailValidationVisible;
notifyPropertyChanged(BR.viewModel);
}
public void onTextChanged(CharSequence s, int start, int before, int count) {
Log.w("tag", "onTextChanged " + s);
this.toggle();
}
}
This is just a test I have. My thought was that I could bind the TextView visibility to a boolean that I can toggle/manipulate with a onTextChanged listener, but I don't know how to wire up the Binding Adapter. Am I on the right path? Is there a better/easier way to do this?
Am I on the right path? Is there a better/easier way to do this?
it is a way of doing it. I would remove the ternary operator from this line
android:visibility="#{viewModel.emailValidationVisible ? View.VISIBLE: View.GONE}"
and create a simple function in your VM that returns it. EG:
#Bindable
public int getVisibility() {
return emailValidationVisible ? View.VISIBLE: View.GONE
}
and in toggle(), you will have something like
public void toggle() {
this.emailValidationVisible = !this.emailValidationVisible;
notifyPropertyChanged(BR.visibility);
}
which will call the getter for you. Your xml will have to be changed like follow
android:visibility="#{viewModel.getVisibility()}"
Alternately you could create a BindingAdapter that takes a Boolean and change the visibility accordingly to it
Is there an option to make the MaterialButtonToggleGroup have a required selected button when using app:singleSelection="true"?
When clicking to a different button works fine (all other buttons are deselected), but when you click the same (already selected) button it deselects it itself and I want to remain selected.
My example:
<com.google.android.material.button.MaterialButtonToggleGroup
android:layout_width="wrap"
android:layout_height="wrap_content"
app:singleSelection="true">
<com.google.android.material.button.MaterialButton
android:id="#+id/filterA"
style="#style/Widget.MaterialComponents.Button.OutlinedButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="A"/>
<com.google.android.material.button.MaterialButton
android:id="#+id/filterB"
style="#style/Widget.MaterialComponents.Button.OutlinedButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="B"/>
<com.google.android.material.button.MaterialButton
android:id="#+id/filterC"
style="#style/Widget.MaterialComponents.Button.OutlinedButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="C"/>
</com.google.android.material.button.MaterialButtonToggleGroup>
You can define it in the layout using the app:selectionRequired attribute:
<com.google.android.material.button.MaterialButtonToggleGroup
app:selectionRequired="true"
app:checkedButton="#id/..."
app:singleSelection="true">
You can also use the method setSelectionRequired:
buttonGroup.setSelectionRequired(true);
Note: This requires a minimum of version 1.2.0-alpha03
I got this working with the following:
toggle_group.addOnButtonCheckedListener { group, checkedId, isChecked ->
if (group.checkedButtonId == -1) group.check(checkedId)
}
If you have singleSelection enabled, the conditional will only evaluate to true when the user has clicked on the button which is already checked, making it so no button is checked. When this happens, we just need to check the button they unchecked.
I also came across this issue and I found this is working with the app:singleSelection="true"
String selectedValue = "Male";
genderBtnToggle.addOnButtonCheckedListener(new MaterialButtonToggleGroup.OnButtonCheckedListener() {
#Override
public void onButtonChecked(MaterialButtonToggleGroup group, int checkedId, boolean isChecked) {
MaterialButton btn = genderBtnToggle.findViewById(checkedId);
if (!isChecked && btn.getText().toString().equals(selectedValue)) {
genderBtnToggle.check(checkedId);
}
if (isChecked) {
selectedValue = btn.getText().toString();
}
}
});
I also came across this issue and will be waiting for a permanent fix from google. In the meantime, I did the following to make sure that at least one button is checked.
final MaterialButtonToggleGroup tGroup = view.findViewById(R.id.toggleGroup);
final MaterialButton breast = tGroup.findViewById(R.id.breast);
final MaterialButton bottle = tGroup.findViewById(R.id.bottle);
final MaterialButton solids = tGroup.findViewById(R.id.solids);
View.OnClickListener onClickListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
tGroup.check(v.getId());
}
};
breast.setOnClickListener(onClickListener);
bottle.setOnClickListener(onClickListener);
solids.setOnClickListener(onClickListener);
Hope this helps.
This question is similar to this. However it did not solve my problem.
I have a ToggleButton and when a user clicks, I do not want to change the state of the ToggleButton, as I am programatically changing the state from another Activity.
How do I override it?
Here is my Activity code:
<ToggleButton
android:id="#+id/alarm1"
android:background="#drawable/check"
android:layout_alignParentLeft="true"
android:layout_margin="8dp"
android:textOn=""
android:onClick="alarmSet1"
android:textOff=""
android:focusable="false"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
Here is the Java code:
public void alarmSet1(View view)
{
int a1=1;
int idTime = (int) System.currentTimeMillis();
Intent intent = new Intent(MainActivity.this, AddAlarm.class);
intent.putExtra("pendInt",idTime);
intent.putExtra("tts",a1);
startActivity(intent);
}
I am late to the party, but I had the exact same question and the given answer didn't fit my needs, so I made something myself.
What I wanted (correct me if this was not the original question):
I want to intercept clicks/swipes on a Switch, RadioButton, CheckBox or any other CompoundButton, making sure the button itself doesn't toggle state, but instead calling a function which will eventually lead to the correct state being set programatically. (eg. using LiveData) so the state of the button is always the same as the state of the data it toggles.
What I made:
/**
* Use this if you want your compoundButton to do something when (un) checked,
* but not change it's state by itself.
*
* It will block the actual changing of the button, but instead run [onCheckedChanged]
* which should in turn eventually lead to setting `isChecked` to get proper setting of the switch
* after its action has been performed
* This might cause some trouble as it will trigger on programmatic sets outside of this listener.
* To get around that, use [setIsCheckedWithoutBypassedListener] if you don't want that to happen.
*/
fun CompoundButton.setInterceptedOnCheckedChangedListener(onCheckedChanged: CompoundButton.OnCheckedChangeListener){
compoundButtonListeners[this] = onCheckedChanged
setOnCheckedChangeListener { compoundButton, b ->
compoundButton.isChecked = !compoundButton.isChecked
onCheckedChanged.onCheckedChanged(compoundButton, b)
}
}
/**
* Set value without triggering the listener added in [setInterceptedOnCheckedChangedListener]
*/
fun CompoundButton.setIsCheckedWithoutBypassedListener(isChecked: Boolean){
compoundButtonListeners[this]?.let{ l ->
setOnCheckedChangeListener(null)
this.isChecked = isChecked
setOnCheckedChangeListener(l)
}
}
/**
* Holds the OnCheckedChangeListeners for the compoundbuttons, as they are private and cannot
* be retreived otherwise.
*/
private val compoundButtonListeners = WeakHashMap<CompoundButton, CompoundButton.OnCheckedChangeListener>()
If this ends up putting a lot of _, _ ->'s in your code, feel free to replace the CompoundButton.OnCheckedChangeListener with a View.OnClickListener.
Leaving this here in case somebody else has the same question as I had.
I am pretty sure using a WeakHashMap prevents a memory leak that would happen on recreating activity. If this is not the case, please educate me :)
It is simple:
Create a CompoundButton.OnCheckedChangeListener and override onCheckedChanged like this:
private CompoundButton.OnCheckedChangeListener _toggleButtonListener = new CompoundButton.OnCheckedChangeListener()
{
#Override
public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
compoundButton.setChecked(false);
// And now, do whatever you want.
}
};
Of course, you have to attach the listener to your button:
... somewhere in the onCreate() method:
ToggleButton toggleButton=findViewById(R.id.alarm1);
toggleButton.setOnCheckedChangeListener(_toggleButtonListener);
And thats it.
Keep coding, and let the code be with you!