How to get the selected index of a RadioGroup in Android

问题

Is there an easy way to get the selected index of a RadioGroup in Android or do I have to use OnCheckedChangeListener to listen for changes and have something that holds the last index selected?

example xml:

<RadioGroup android:id=\"@+id/group1\" android:layout_width=\"fill_parent\" android:layout_height=\"wrap_content\" android:orientation=\"vertical\">
    <RadioButton android:id=\"@+id/radio1\" android:text=\"option 1\" android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" />
    <RadioButton android:id=\"@+id/radio2\" android:text=\"option 2\" android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" />
    <RadioButton android:id=\"@+id/radio3\" android:text=\"option 3\" android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" />
    <RadioButton android:id=\"@+id/radio4\" android:text=\"option 4\" android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" />
    <RadioButton android:id=\"@+id/radio5\" android:text=\"option 5\" android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" />
</RadioGroup>

if a user selects option 3 I want to get the index, 2.

回答1:

You should be able to do something like this:

int radioButtonID = radioButtonGroup.getCheckedRadioButtonId();
View radioButton = radioButtonGroup.findViewById(radioButtonID);
int idx = radioButtonGroup.indexOfChild(radioButton);

If the RadioGroup contains other Views (like a TextView) then the indexOfChild() method will return wrong index.

To get the selected RadioButton text on the RadioGroup:

 RadioButton r = (RadioButton) radioButtonGroup.getChildAt(idx);
 String selectedtext = r.getText().toString();

回答2:

This should work,

int index = myRadioGroup.indexOfChild(findViewById(myRadioGroup.getCheckedRadioButtonId()));

回答3:

You could have a reference to the radio group and use getCheckedRadioButtonId () to get the checked radio button id. Take a look here

RadioGroup radioGroup = (RadioGroup)findViewById(R.id.radio_group);

Then when you need to get the selected radio option.

int checkedRadioButtonId = radioGroup.getCheckedRadioButtonId();
if (checkedRadioButtonId == -1) {
    // No item selected
}
else{
    if (checkedRadioButtonId == R.id.radio_button1) {
        // Do something with the button
    }
}

回答4:

try this

        RadioGroup  group= (RadioGroup) getView().findViewById(R.id.radioGroup);
        group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup radioGroup, int i) {
                View radioButton = radioGroup.findViewById(i);
                int index = radioGroup.indexOfChild(radioButton);
            }
        });

回答5:

You can either use OnCheckedChangeListener or can use getCheckedRadioButtonId()

回答6:

You can use:

RadioButton rb = (RadioButton) findViewById(rg.getCheckedRadioButtonId());

回答7:

//use to get the id of selected item

int selectedID = myRadioGroup.getCheckedRadioButtonId();

//get the view of the selected item

View selectedView = (View)findViewById( selectedID);

回答8:

It worked perfectly for me in this way:

    RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radio_group);
    int radioButtonID = radioGroup.getCheckedRadioButtonId();
    RadioButton radioButton = (RadioButton) radioGroup.findViewById(radioButtonID);
    String selectedtext = (String) radioButton.getText();

回答9:

All you need is to set values first to your RadioButton, for example:

RadioButton radioButton = (RadioButton)findViewById(R.id.radioButton);      
radioButton.setId(1);        //some int value

and then whenever this spacific radioButton will be chosen you can pull its value by the Id you gave it with

RadioGroup radioGroup = (RadioGroup)findViewById(R.id.radioGroup);                     
int whichIndex = radioGroup.getCheckedRadioButtonId(); //of course the radioButton
                                                       //should be inside the "radioGroup"
                                                       //in the XML

Cheers!

回答10:

radioSexGroup=(RadioGroup)findViewById(R.id.radioGroup);

  btnDisplay=(Button)findViewById(R.id.button);

  btnDisplay.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
        int selectedId=radioSexGroup.getCheckedRadioButtonId();
        radioSexButton=(RadioButton)findViewById(selectedId);
        Toast.makeText(MainActivity.this,radioSexButton.getText(),Toast.LENGTH_SHORT).show();
     }
  });

回答11:

 int index_selected = radio_grp.indexOfChild(radio_grp
                .findViewById(radio_grp.getCheckedRadioButtonId()));

回答12:

you can do

findViewById

from the radio group .

Here it is sample :

((RadioButton)my_radio_group.findViewById(R.id.radiobtn_veg)).setChecked(true);

回答13:

just use this:

    int index = 2;
    boolean option3Checked = radioGroup.getCheckedRadioButtonId() == radioGroup.getChildAt(2).getId();

回答14:

You can simply

-declare the radio group and a radio button out of onCreate method

private RadioGroup GrupName;
private RadioButton NameButton;

-set the view id in the onCreate method

GrupName = (RadioGroup) findViewById(R.id.radioGroupid);

-take the radiobutton id selected using

int id = GroupName.getCheckedRadioButtonId();

-use the id to match the buttonselected view

NameButton = (RadioButton) findViewById(id);

-finally get the value of the radio button

String valueExpected = NameButton.getText().toString();

--- PS: IF YOU WANT AN INT VALUE, THEN YOU CAN CAST IT

int valueExpectedIn = Integer.parseInt(valueExpected);

回答15:

Kotlin:

val selectedIndex = radioButtonGroup?.indexOfChild(
  radioButtonGroup?.findViewById(
    radioButtonGroup.getCheckedRadioButtonId())
)

来源：https://stackoverflow.com/questions/6440259/how-to-get-the-selected-index-of-a-radiogroup-in-android

标签

java

android

xml

radio-group