How to add radio button dynamically as per the given number of counts?

Question

I have tried this code..It will display three radio buttons in a single row when the emulator starts. But I need a button event for this. i.e; if I click the button, it should ask for number of radio buttons. then If I give the count, it must display the radio buttons based on the count given. For example, If I give the count as 3, it must display the three radio buttons in a single row. Your help is highly appreciated. Thanks in advance.

  public class MyActivity extends Activity {
    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        for(int row=0; row < 1; row++)
        {
            LinearLayout ll = new LinearLayout(this);
            ll.setOrientation(LinearLayout.HORIZONTAL);
            for(int i = 1; i < 4; i++) {
                RadioButton rdbtn = new RadioButton(this);
                rdbtn.setId((row * 2) + i);
                rdbtn.setText("Radio " + rdbtn.getId());
                ll.addView(rdbtn);
            }
            ((ViewGroup)findViewById(R.id.radiogroup)).addView(ll);
        }
    }
    }

this is xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                tools:context=".MainActivity" >

    <RadioGroup
            android:id="@+id/radiogroup"
            android:orientation="vertical"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"/>

    </RelativeLayout>

Answer 1

Please find below the code, I have created an 'EditText' and a 'Button' in the xml layout. Input a number in the 'EditText' and click the Button , The same no. of radio buttons will be added in the Layout.

This is your ActivityMain

public class ActivityMain extends AppCompatActivity implements View.OnClickListener {

    EditText mEtNumOfRadioBtns;
    Button mBtnAdd;
    String TAG = "TestActivity";
    RadioGroup mRgAllButtons;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //
        mEtNumOfRadioBtns = findViewById(R.id.et_no);
        mBtnAdd = findViewById(R.id.btn);
        mRgAllButtons = findViewById(R.id.radiogroup);
        //
        mBtnAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int number = Integer.parseInt(mEtNumOfRadioBtns.getText().toString().trim());
                addRadioButtons(number);
            }
        });
    }

    public void addRadioButtons(int number) {
        mRgAllButtons.setOrientation(LinearLayout.HORIZONTAL);
        //
        for (int i = 1; i <= number; i++) {
            RadioButton rdbtn = new RadioButton(this);
            rdbtn.setId(View.generateViewId());
            rdbtn.setText("Radio " + rdbtn.getId());
            rdbtn.setOnClickListener(this);
            mRgAllButtons.addView(rdbtn);
        }
    }

    @Override
    public void onClick(View v) {
        Log.d(TAG, " Name " + ((RadioButton)v).getText() +" Id is "+v.getId());
    }
}

And here is your layout file with name 'activity_main'

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <RadioGroup
        android:id="@+id/radiogroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:orientation="vertical" />

    <LinearLayout
        android:layout_marginTop="20dp"
        android:layout_marginLeft="20dp"
        android:layout_height="wrap_content"
        android:layout_width="match_parent">

        <EditText android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:hint="Enter no."
            android:inputType="number"
            android:id="@+id/et_no"/>

        <Button
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:text="Add Radio btn"
            android:id="@+id/btn"/>

    </LinearLayout>
    
</RelativeLayout>