12 Program to show the following output. First two radio buttons are without using a radio group and next two radio buttons are using radio group. Note the changes between these two. Also toast which radio button has been selected.

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.blogspot.codingatharva.manualprograms">



<application

    android:allowBackup="true"

    android:icon="@mipmap/ic_launcher"

    android:label="@string/app_name"

    android:roundIcon="@mipmap/ic_launcher_round"

    android:supportsRtl="true"

    android:theme="@style/AppTheme">

    <activity android:name=".MainActivity">

        <intent-filter>

            <action android:name="android.intent.action.MAIN" />



            <category android:name="android.intent.category.LAUNCHER" />

        </intent-filter>

    </activity>

</application>



</manifest>

MainActivity.java:

package com.blogspot.codingatharva.manualprograms;



import androidx.appcompat.app.AppCompatActivity;



import android.os.Bundle;

import android.view.View;

import android.widget.Button;



import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.Toast;





public class MainActivity extends AppCompatActivity {



    RadioButton rb1, rb2, rg1;

    RadioGroup rg;



    Button b;

    StringBuffer sb;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        sb = new StringBuffer("You Selected: ");



        b = findViewById(R.id.btn);

        rb1 = findViewById(R.id.rb1);

        rb2 = findViewById(R.id.rb2);



        rg = findViewById(R.id.rg);



        b.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {



                rg1 = findViewById(rg.getCheckedRadioButtonId());



                if (rb1.isChecked())

                    sb.append("\n"+rb1.getText());



                if (rb2.isChecked())

                    sb.append("\n"+rb2.getText());



                if (rg1.isChecked())

                    sb.append("\n"+rg1.getText());



                Toast.makeText(getApplicationContext(), sb, Toast.LENGTH_SHORT).show();

                sb.delete(13, sb.length() - 1);

            }



        });





    }

}

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Single Radio Buttons"

        android:textSize="25dp" />

    <RadioButton
        android:id="@+id/rb1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Radio Button 1" />

    <RadioButton
        android:id="@+id/rb2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Radio Button 2" />

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@android:color/black" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Radio Button inside RadioGroup"
        android:paddingTop="20dp"
        android:textSize="25dp" />

    <RadioGroup
        android:id="@+id/rg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <RadioButton
            android:id="@+id/rbmale"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Male" />

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

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:padding="10dp"
        android:text="Show Selected"
        android:textSize="25dp" />
</LinearLayout>

Output:

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