Change the state of a switch without triggering OnCheckChanged listener

Question

Is there any workaround helps me to programmatically change the state of Switch widget using switch.setChecked(true); without triggering OnCheckedChangedlistener()?

switch.setChecked(true); trigger OnCheckedChangedlistener() automatically but I need it triggered only when the user changes the state manually. So I need to stop
switch.setChecked(true); triggering OnCheckedChangedlistener()

but it trigger `OnCheckedChangedlistener()` automatically which i need it triggered only when user change state manually — Safa, Jan 16 '18 at 13:27
When add this line `switch.setChecked(true/false)` to change state based on response from API and debug i found that, this code called @Override public void onCheckedChanged(SwitchButton view, boolean isChecked) { if (isChecked) { requestPermissions(); } } — Safa, Jan 16 '18 at 13:31

score 15 · Answer 1 · answered May 08 '18 at 05:29

15

I worked around this problem by using setOnClickListener() instead of setOnCheckedChangeListener(), then I can use isChecked inside the click listener to know whether the Switch is checked or not, e.g.:

switchView.setOnClickListener {
    val isChecked = switchView.isChecked

    // Do something with the check status
}

answered May 08 '18 at 05:29

Franco

2,711
2
20
27

1

Bear in mind, that swiping the switch (instead of clicking) won't trigger this listener. – fernandospr Jul 23 '21 at 12:58
This solution help me too. setOnCheckedChangeListener() - works automatically even if you not click switch button. But switchView.setOnClickListener{} - works as it must be... – Miramax Mars May 25 '22 at 15:14
1

Does not work for swipe. So it isn't a good solution! – zidanex Nov 10 '22 at 16:35

score 13 · Answer 2 · answered Sep 21 '22 at 23:42

13

Instead of using onClickListener to handle switch events you should use

 mySwitch.setOnCheckedChangeListener { compoundButton, isChecked ->
    if (compoundButton?.isPressed == true) 
        viewModel.onMySwitchChanged(isChecked)
}

the check if (compoundButton?.isPressed == true) prevent running viewModel.onMySwitchChanged when you set the switch state like mySwitch.isChecked = true or mySwitch.isSelected = true

answered Sep 21 '22 at 23:42

NewbornDroid

247
1
3
12

1

not sure why this don't get more upvotes, this works and simplifies a lot of things! – Bruce Oct 13 '22 at 00:59
This is the way to go and should be the correct answer! – zidanex Nov 10 '22 at 16:33
agreed! This solution works best to me. – enghong Feb 08 '23 at 01:30

score 6 · Answer 3 · answered Jan 16 '18 at 13:35

6

You can remove that listener first and set it again after.

switch.setOnCheckChangedListener(null);
switch.setChecked(true);
switch.setOnCheckChangedListener(mOnCheckChangedListener);

answered Jan 16 '18 at 13:35

egoldx

1,490
1
9
14

I tried this solution but after set listener again it behave like user clicked switch and call `OnCheckChangedListener()` – Safa Jan 16 '18 at 13:37
well, you could try some workaround, `switch.post(() -> switch.setOnCheckChangedListener(mOnCheckChangedListener))` – egoldx Jan 16 '18 at 13:40
Same behavior, it's really so weird :( – Safa Jan 16 '18 at 14:06

score 2 · Answer 4 · answered Jan 16 '18 at 13:36

2

2 ways:

Whenever you change programmatically, maintain a boolean variable and set it to true. In OnCheckedChangeListener(), check if has come from the user or programmatically.
(Not recommended) Before you change programmatically, set yourSwtich.setOnCheckedChangeListener(null) to null. Then in next line again set your listener

answered Jan 16 '18 at 13:36

Geethakrishna Juluri

530
3
12

1- when i set the boolean variable in `OnCheckedChangeListener()` it will be always true even i changed it before `switch.setChecked(true/false)` as once it called `OnCheckedChangeListener()` it will be true 2- I tried this solution but after set listener again it behave like user clicked switch and call `OnCheckChangedListener()` – Safa Jan 16 '18 at 14:20
1

For(1) first answer, you have to set that boolean variable as false always in OnCheckedChangeListener() at the end. And before changing programmatically you have to set it to true. – Geethakrishna Juluri Jan 17 '18 at 05:41

Change the state of a switch without triggering OnCheckChanged listener

4 Answers4