Get the index of a RadioGroup in Android

Question

I have two RadioButton in a RadioGroup:

<RadioGroup
    android:id="@+id/rgTripType"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="4" >

    <RadioButton
        android:id="@+id/rbOneWay"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="true"
        android:text="One Way" />

    <RadioButton
        android:id="@+id/rbRound"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Round" />
</RadioGroup>

I am calling the RadioGroup in my Java file as:

    final RadioGroup rgTypeOfTrip = (RadioGroup) findViewById(R.id.rgTripType);

        btnCalc.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                  Toast.makeText(MainActivity.this, CALL FUNCTION GETINDEX() to get value, Toast.LENGTH_SHORT).show();
        });

        rgTypeOfTrip.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                // TODO Auto-generated method stub

                // Method 1
                int pos=rgTypeOfTrip.indexOfChild(findViewById(checkedId));
                    getIndex(pos);
                Toast.makeText(MainActivity.this, String.valueOf(pos), Toast.LENGTH_SHORT).show();
            }
        });

public int getIndex(int k) {
    return k;
}

What it is supposed to do is display a Toast with the index of the radio button within the radio group. Instead, it causes my program to crash. Any idea how to resolve it?

UPDATE: The index issue is solved.

Issue: How can I use the index value (POS) in the btnClick function?

Answer 1

It crashes because pos is an integer change. If you pass an int value as second paramter you are asking android to look for a String with id the int you provide. If it does not exists the ResourcesNotFoundException will be thrown

Toast.makeText(MainActivity.this, pos, Toast.LENGTH_SHORT).show();

with

 Toast.makeText(MainActivity.this, String.valueOf(pos), Toast.LENGTH_SHORT).show();

Answer 2

There are different way .. I used this way

        RadioGroup radiogroup = (RadioGroup) findViewById(R.id.groupid);
    Button bt = (Button) findViewById(R.id.btnDisplay);

    bt.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // get selected radio button from radioGroup
            int selectedId = radiogroup.getCheckedRadioButtonId();
            switch (selectedId) {

                case R.id.radio_button1:
                 // do something..
                    break;
                case R.id.radio_button2:
                  // do something..
                    break;

            }


        }
    });