Radio Button Example

Q7. Create a radio button group with radio button of all courses in your college and on selecting a particular course, teacher-in- charge of that course should appear at the bottom of the screen.

Android program :

Activity_main.xml

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

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

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/activity_main"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:orientation="vertical"

    tools:context="com.kishanhaldar.program7.MainActivity">

            <TextView

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="Teacher Incharge Name :    "

                android:layout_gravity="center"

                android:layout_marginBottom="20dp"

                />

    <RadioGroup

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/choices"

        android:layout_marginBottom="30dp">

        <RadioButton

            android:id="@+id/cs"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Computer Science"

            android:textSize="20sp"

            />

        <RadioButton

            android:id="@+id/math"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Mathematics"

            android:textSize="20sp"

            />

        <RadioButton

            android:id="@+id/phy"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Physical Science"

            android:textSize="20sp"

            />

        <RadioButton

            android:id="@+id/comm"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="Commerce "

            android:textSize="20sp"

            />

        <RadioButton

        android:id="@+id/bio"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Biology"

        android:textSize="20sp"

        />

    </RadioGroup>

    <TableLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content">

        <TableRow>

            <TextView

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="Name :    "

                />

            <TextView

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:minWidth="250px"

                android:id="@+id/name"

                />

        </TableRow>

    </TableLayout>

</LinearLayout>

MainActivity.xml

package com.kishanhaldar.program7;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.EditText;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener {

    TextView tv = null;

    RadioButton r1 = null;

    RadioButton r2 = null;

    RadioButton r3 = null;

    RadioButton r4 = null;

    RadioButton r5 = null;

    RadioGroup group = null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        tv = (TextView) findViewById(R.id.name);

        r1 = (RadioButton) findViewById(R.id.cs);

        r2 = (RadioButton) findViewById(R.id.math);

        r3 = (RadioButton) findViewById(R.id.phy);

        r4 = (RadioButton) findViewById(R.id.comm);

        r5 = (RadioButton) findViewById(R.id.bio);

        group = (RadioGroup) findViewById(R.id.choices);

        group.setOnCheckedChangeListener(this);

    }

    @Override

    public void onCheckedChanged(RadioGroup group, int check) {

        if (check == r1.getId()) {

            tv.setText("Mr. Rahul Singh");

        }

        if(check==r2.getId()) {

            tv.setText("Mr. Kesav Pardap Singh");

        }

        if(check==r3.getId()) {

            tv.setText("Ms. Anu Praveen");

        }

        if(check==r4.getId()) {

            tv.setText("Ms. Sunita Narang");

        }

        if(check==r5.getId()) {

            tv.setText("Ms. Harita Ahuja");

        }

    }

  

}