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 RadioButton:-



This widget is used to choose a single option in a group of options.

Android provides <RadioGroup> class to manage RadioButton Grouping and SubGrouping.

<RadioButton>:  class is used to provide a RadioButton view on Android Activity.


Example of RadioButton



Code for Activity Design File:-



<?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:paddingTop="120dp"
tools:context=".MainActivity9">

<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Basic Course"
android:id="@+id/rbbasic">

</RadioButton>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Advance Course"
android:id="@+id/rbadvance">

</RadioButton>

<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Placement Course"
android:id="@+id/rbplacement">

</RadioButton>
</RadioGroup>


<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click"
android:id="@+id/btnradio">

</Button>
</LinearLayout>



Code for Activity Class File


package com.example.additionapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.Toast;

public class MainActivity9 extends AppCompatActivity {

RadioButton rb1,rb2,rb3;
Button btn;
String s="";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main9);
rb1 = findViewById(R.id.rbbasic);
rb2 = findViewById(R.id.rbadvance);
rb3 = findViewById(R.id.rbplacement);
btn = findViewById(R.id.btnradio);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(rb1.isChecked())
{
s = rb1.getText().toString();
}
else if(rb2.isChecked())
{
s = rb2.getText().toString();
}
else
{
s = rb3.getText().toString();
}

Toast.makeText(getApplicationContext(),s,Toast.LENGTH_SHORT).show();
}


});

}
}







Checkbox widget:-


We can choose multiple options in a group of options,  Android provides Checkbox class to implement Checkbox Widget in the android application.


<Checkbox>



Checkbox provide is a checked method to check that checkbox is checked or not, if it is checked then it returns true otherwise it returns false.

StringBuffer class will be used to store multiple String type data under the checkbox.


Syntax of StringBuffer


StringBuffer sb = new StringBuffer();



Example of CheckBox:-


Code of Design File or XML File:-


<?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"
tools:context=".MainActivity10">

<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/chkc"
android:text="C"></CheckBox>
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/chkcpp"
android:text="CPP"></CheckBox>
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/chkds"
android:text="DS"></CheckBox>

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click"
android:onClick="fun"
android:id="@+id/btnchk">

</Button>

</LinearLayout>


Code of Java or Activity File:-

package com.example.additionapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Toast;

public class MainActivity10 extends AppCompatActivity {


CheckBox chk1,chk2,chk3;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main10);
chk1 = findViewById(R.id.chkc);
chk2 = findViewById(R.id.chkcpp);
chk3 = findViewById(R.id.chkds);

}

public void fun(View v)
{
StringBuffer sb = new StringBuffer();
if(chk1.isChecked())
{
sb.append(chk1.getText().toString() + " ");
}
if(chk2.isChecked())
{
sb.append(chk2.getText().toString() + " ");
}
if(chk3.isChecked())
{
sb.append(chk3.getText().toString() + " ");
}

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

















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