FreeRadioGroup

FreeRadioGroup is an Android library that allows grouping radio buttons without constraining them into a Linear Layout fashion, you can place the buttons anywhere you like.

Download

To add FreeRadioGroup to your project add the following gradle dependency:

implementation 'br.com.mauker:freeradiogroup:1.0.1'

Also make sure to have jcenter() in your gradle repositories.

Usage

To use FreeRadioGroup add the following code in the same XML layout as your Radio Buttons:

<br.com.mauker.freeradiogroup.FreeRadioGroup
    android:id="@+id/radioGroup"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:referenced_ids="radioButton,radioButton2,radioButton3"
    app:checkedRadioButton="@id/radioButton2"
    tools:ignore="MissingConstraints" />

Breaking down the properties

• The first and most important attribute is app:referenced_ids. Use it to add radio buttons to this group by adding their IDs;
• The app:checkedRadioButton attribute will define which radio button from this group should be checked by default;
• As of V_1.0.0 if you're adding FreeRadioGroup inside a constraint layout, it's necessary to add the tools:ignore="MissingConstraints" to safely ignore the missing constraints error message.

Note: Since FreeRadioGroup has no width or height, you can use either wrap_content or 0dp.

Using the group in your Kotlin (or Java) code

To use FreeRadioGroup inside your code, simply use findViewById() to get its reference.

val group: FreeRadioGroup = findViewById(R.id.radioGroup)

Checking and clearing programmatically

You can either check an individual radio button from a group or clear the selection using the following methods:

• group.check(radioButtonId: Int) to check a the radio button from this group;
• group.clearCheck() to clear the current selection.

Getting the current selection

You can get the selected radio button by using the group.getCheckedRadioButtonId() method. It'll return the radio button ID or View.NO_ID if there's no selection.

Setting up the checked listener

It's also possible to listen for changes in selection by using the OnCheckedChangeListener interface.

group.setOnCheckedChangeListener(object: OnCheckedChangeListener {
    override fun onCheckedChanged(group: FreeRadioGroup, checkedId: Int) {
        // Do something with the selection
    }
})