CODEWITHSUNDEEP
androidandroid-switch
Jumpa
Jumpa

Reputation: 4419

Switch Set Checked False

I've a Switch with a listener:

mSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
}

Doing:

mSwitch.setChecked(false);

has no effect, callback is not triggered. Instead like this:

mSwitch.setChecked(true);
mSwitch.setChecked(false);

works as expected. Am I doing something wrong? If the checkbox state is false and one use setChecked(false), the normal behaviour is to skip callback? Or is it a bug?

Upvotes: 4

Views: 13611

Answers (4)

yahyabc
yahyabc

Reputation: 1

in kotlin

override fun onStart() {
    super.onStart()
    mSwitch.setChecked(false)
}

Upvotes: 0

appersiano
appersiano

Reputation: 2780

No it's not a bug, is the normal behavior.

If you look the code of the CompoundButton you can see

/**
     * <p>Changes the checked state of this button.</p>
     *
     * @param checked true to check the button, false to uncheck it
     */
    public void setChecked(boolean checked) {
        if (mChecked != checked) {
            mChecked = checked;
            refreshDrawableState();
            notifyViewAccessibilityStateChangedIfNeeded(
                    AccessibilityEvent.CONTENT_CHANGE_TYPE_UNDEFINED);

            // Avoid infinite recursions if setChecked() is called from a listener
            if (mBroadcasting) {
                return;
            }

            mBroadcasting = true;
            if (mOnCheckedChangeListener != null) {
                mOnCheckedChangeListener.onCheckedChanged(this, mChecked);
            }
            if (mOnCheckedChangeWidgetListener != null) {
                mOnCheckedChangeWidgetListener.onCheckedChanged(this, mChecked);
            }

            mBroadcasting = false;            
        }
}

Where mChecked is the actual value of the switch.

If you want to trigger every time simple override onClick listener like this

mSwitch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this, "Is checked? "+mSwitch.isChecked(), Toast.LENGTH_SHORT).show();
            }
        });

Upvotes: 1

visionix visionix
visionix visionix

Reputation: 780

The callback will be called only when you defined your listener and afterwords try to change it by setChecked(false/true)

Upvotes: 0

Nongthonbam Tonthoi
Nongthonbam Tonthoi

Reputation: 12963

It will be Called when the checked state of a compound button has changed.

So if its state is already false it won't be called when you call false.

Upvotes: 1

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