android onCheckedChanged for radiogroup

Question

I'm writing an Activity in android where I have two radio buttons under a RadioGroup. One of them is checked by default. But I can't trigger the event in onCreate method so that I can do something in that. The onCheckedChanged is running fine when clicked on.

RadioGroup ItemtypeGroup = (RadioGroup) findViewById(R.id.rechargeItemtype);
    RadioButton providerRadio = (RadioButton) findViewById(R.id.a);
    providerRadio.performClick();

    ItemtypeGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged (RadioGroup group,int checkedId){

            Log.d("chk", "id" + checkedId);

            if (checkedId == R.id.a) {
                //some code
            } else if (checkedId == R.id.b) {
                //some code
            }
        }
    });

Answer 1

To fire a radio check box for the default when initializing. Set everything to unchecked with the clearCheck method, then set the handler, then set the default and your handler will fire.

itemtypeGroup.clearCheck();

then same as usual add a listener...

itemtypeGroup
        .setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
Log.d("chk", "id" + checkedId);

                if (checkedId == R.id.a) {
                    //some code
                } else if (checkedId == R.id.b) {
                    //some code
                }

            }

        });

Then check the default radio button and your listener will fire.

rb = (RadioButton) view.findViewById(R.id.a);
rb.setChecked(true);

Good Luck

Answer 2

 radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {

            if (checkedId == R.id.radioButton1) {
             //do work when radioButton1 is active
            } else  if (checkedId == R.id.radioButton2) {
             //do work when radioButton2 is active
          } else  if (checkedId == R.id.radioButton3) {
             //do work when radioButton3 is active
          }

        }
    });

this work for me . hope is helpfull

Answer 3

Try this Code.

Declare this code in your onCreate method.

    RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radiogroup);
    radioGroup.clearCheck();
    radioGroup.setOnCheckedChangeListener(new  RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {

            RadioButton rb = (RadioButton) group.findViewById(checkedId);
            if (null != rb && checkedId > -1) {

                // checkedId is the RadioButton selected
                switch (checkedId) {
                    case R.id.one:
                     // Do Something
                      break;

                    case R.id.two:
                    // Do Something
                      break;   

                    case R.id.three:
                    // Do Something   
                        break;
                }
            }
        }

    });

Hope this helps.

Answer 4

The problem is because, you are setting OnCheckedChangeListener on RadioGroup after the providerRadio.performClick(); method call.

That's why when providerRadio.performClick(); method executes till then their is no OnCheckedChangeListener available to call. So, to make it work, you need to set Listener before the call to performClick() method.

And instead of using RadioButton.performClick() you should use RadioGroup.check() method to change the current checked RadioButton.

So you can use this code to change current selection of RadioGroup

RadioGroup ItemtypeGroup = (RadioGroup) findViewById(R.id.rechargeItemtype);
ItemtypeGroup
        .setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                Log.d("chk", "id" + checkedId);

                if (checkedId == R.id.a) {
                    //some code
                } else if (checkedId == R.id.b) {
                    //some code
                }

            }

        });
ItemtypeGroup.check(R.id.a);

Note:- Make sure to call RadioGroup.check() method after adding OnCheckedChangeListener as above in code snippet.

Answer 5

I guess you are performing click before setting listener to the group, that's why event is not triggered.

Answer 6

Even though @dannys answer is ok I would like to have the default value taken from the XML layout definition file rather then setting it in code.

That's why I use this approach to:

1. store the default value form the radio group
2. clear all check's
3. initialize the OnCheckedChangeListener
4. check the default again (which was stored previously) which triggers the listener

This could look like this in code with the first_radio_button as the default radio button:

// call this in any init method
_myRadioGroup    = _myViewContainingTheRadioGroup.findViewById(R.id.my_radio_group);
int defaultValue = _myRadioGroup.getCheckedRadioButtonId();
_myRadioGroup.clearCheck();
_myRadioGroup.setOnCheckedChangeListener(_myRadioGroupCheckedChangeListener);
_myRadioGroup.check(defaultValue);

Place the OnCheckedChangeListener somewhere in your class:

private RadioGroup.OnCheckedChangeListener _myRadioGroupCheckedChangeListener = new RadioGroup.OnCheckedChangeListener()
{
  @Override
  public void onCheckedChanged(RadioGroup group, int checkedId)
  {
    switch(group.findViewById(checkedId).getId())
    {
      case R.id.first_radio_button:
        // do stuff
        break;
      case R.id.second_radio_button:
        // do stuff
        break;
      // ...
    }
  }
};

This is my radio group xml

  <RadioGroup
    android:id="@+id/my_radio_group"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <RadioButton
      android:id="@+id/first_radio_button"
      android:layout_width="wrap_content"
      android:layout_height="match_parent"
      android:checked="true"
      android:text="@string/first_radio_button_text"/>

    <RadioButton
      android:id="@+id/second_radio_button"
      android:layout_width="wrap_content"
      android:layout_height="match_parent"
      android:text="@string/second_radio_button_text"/>

    // ...

  </RadioGroup>