Android check which radiobutton is checked

How to check if a radiobutton is checked in a radiogroup in Android?

I need to set validation that user must fill / select all details in a page. If any fields are empty wanna show Toast message to fill. Now I need set validation for RadioButton in the RadioGroup. I tried this code but didn’t work properly. Suggest me correct way. Thankyou.

11 Answers 11

If you want to check on just one RadioButton you can use the isChecked function

and if you have a RadioGroup you can use

All you need to do is use getCheckedRadioButtonId() and isChecked() method,

Use the isChecked() function for every radioButton you have to check.

Then use the result for your if/else case consideration.

Try to use the method isChecked();

selectedRadioButton.isChecked() -> returns boolean.

Refere here for more details on Radio Button

try to use this

this is java class

I used the following and it worked for me. I used a boolean validation function where if any Radio Button in a Radio Group is checked, the validation function returns true and a submission is made. if returned false, no submission is made and a toast to «Select Gender» is shown:

If no gender radio button is selected, then the code to proceed will not run.

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RadioGroup: How to check programmatically

I create a RadioGroup from XML

In Java code, I programmatically check the first one on activity creation (onCreate()) as following:

But when the activity is shown, no radio button is checked. Any help?

11 Answers 11

In your layout you can add android:checked=»true» to CheckBox you want to be selected.

Or programmatically, you can use the setChecked method defined in the checkable interface:

RadioButton b = (RadioButton) findViewById(R.id.option1); b.setChecked(true);

try this if you want your radio button to be checked based on value of some variable e.g. «genderStr» then you can use following code snippet

You may need to declare the radio buttons in the onCreate method of your code and use them.

Watch out! checking the radiobutton with setChecked() is not changing the state inside the RadioGroup. For example this method from the radioGroup will return a wrong result: getCheckedRadioButtonId() .

Check the radioGroup always with

you’ve been warned 😉

I use this code piece while working with indexes for radio group:

Also you can use getChildAt() method. Like this:

Grab the radio group and look at the children to see if any are unchecked.

I use this code piece while working with getId() for radio group:

set position as per your design of RadioGroup

hope this will help you!

it will work if you put your mOption.check(R.id.option1); into onAttachedToWindow method or like this:

the reason may be that check method will only work when the radiogroup is actually rendered.

I prefer to use

instead of using the accepted answer.

The reason is setChecked(true) only changes the checked state of radio button. It does not trigger the onClick() method added to your radio button. Sometimes this might waste your time to debug why the action related to onClick() not working.

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How to set radio button checked as default in radiogroup?

I have created RadioGroup and RadioButton dynamically as following:

Here step radioBtn2.setChecked(true); causes radioBtn2 always checked. That means I cannot uncheck radioBtn2 by checking other two radio buttons ( radioBtn1 , radioBtn3 ). I want to make that RadioGroup can check only one radio button at a time (Now it can check two radiobutton at a time).

How can I solve this problem?

8 Answers 8

you should check the radiobutton in the radiogroup like this:

Of course you first have to set an Id to your radiobuttons

EDIT: i forgot, radioButton.getId() works as well, thx Ramesh

works in radiogroup xml

In case for xml attribute its android:checkedButton which takes the id of the RadioButton to be checked.

In the XML file set the android:checkedButton field in your RadioGroup , with the id of your default RadioButton :

There was same problem in my Colleague’s code. This sounds as your Radio Group is not properly set with your Radio Buttons. This is the reason you can multi-select the radio buttons. I tried many things, finally i did a trick which is wrong actually, but works fine.

Here I set one for loop, which checks for the available radio buttons and de-selects every one except the new clicked one. try it.

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radio button is checked, still isChecked() returns false in android

I’m facing problem with radio buttons in my activity. I have added two radio buttons in a radiogroup.

When I check site_automation_yes radioButton, isChecked() still returns false. Also for the very first time when the activity is created, I’m unable to check the «site_automation_no» radio button. But when I check the site_automation_yes first, then I am able to check and uncheck both the radio buttons. But for the site_automation_yes isChecked always return false,irrespective of whether it is checked or not. Can someone tell me how to fix this. Thanks in advance.

1 Answer 1

If you want the checked radio then you have to follow this : 1. Give id to radio group 2. Use below example :

Here, radioSexGroup is a RadioGroup id. Get checked radio button by getCheckedRadioButtonId(); then simply get the name of checked radio button.

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Using Radio Button and Check Box in Android

By now you must be very much familiar with EditText and TextView and various layouts. Let’s move on and learn more about other views like RadioButton and CheckBox .

In this tutorial we are going to design a form where user will have to select one of the options using radio button. There will be some more suggestions and options that the user will have to select using check boxes. Then we will display all the options selected by the user using a Toast on the display screen.

Let’s start with RadioButton and RadioGroup

So let’s begin. Create a new Android Application Project and copy the below content of the XML layout file.

You will see the following output:

Once the layout is done, we will now work on the background logic(backend) of the user interface which will fetch the user selection and display it on the screen using a toast.

So we will require the views that the user will interact with so that we can get the necessary information. Then we need to implement click listener on the Submit button.

Inside the onClickListener() first we have to get the selected radio button id from the RadioGroup. Once we have the id of the selected Radio Button, we can easily fetch the text value of the selected radio button to display it on screen. Let’s implement this. Below we have the MainActivity.java file with all the code.

To get the selected radio button, we have used radioGroup.getCheckedRadioButtonId() method, which returns the id of the selected radio button.

Then to get the text of the selected radio button, we have used getText() method on that selected radio button. The text we receive from this method is converted to String type using the toString() method. Finally, we have displayed the selected option value to the user using a Toast.

Add the above code in the MainActivity.java file and then run your Android Application Project. The result will be similar to the image shown below. Whenever the user selects any option, it will be displayed to the user as a Toast.

It’s Time for CheckBox

Now, it’s time to play with some check boxes. Extend the UI design by copy-pasting the following code after the Button view (with id as btnSubmit) in the layout XML file.

IMPORTANT: For the SUBMIT button we must set this property: android:layout_below=»@+id/cb4″ , to make it appear at the end, as we have added checkboxes to our existing form now.

Checkboxes are used to display multiple options to the user, and the user is allowed to select one or more out of those options. All check boxes have the checked property set to false initially.

To get user selected check box values from the UI when the user clicks on the SUBMIT button, we will use the isChecked() to check if the check box was selected or not.

So we will have to make a few changes in our MainActivity.java class file. First we will have to create instances for the check boxes by using findViewById() method. For this, we also have to declare global variables of CheckBox type.

To declare the global variable,

Then, inside the onCreate() method, store the CheckBox view from the XML into Java using findViewById() method.

Once we have all the instances ready, all we have to do is check which checkboxes are selected by the user when the user clicks on the SUBMIT button. This is done by using isChecked() method of the CheckBox view, as we already mentioned.

isChecked() method returns true if a checkbox is checked otherwise it returns false. Selected checkboxes values are retrieved and added to one string( checkBoxChoices ) using getText() and toString() methods. At last, a Toast is used to display all the selected options.

So update the existing code inside the OnClick() method of the SUBMIT button with the following code:

When you run the app, you will see that out all the radio buttons, you are able to select only one radio button while in case of check boxes, you can select any number of them. That is how radio buttons and checkboxes work. So this is all about implementation of RadioButton and CheckBox in Android Application Development.

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