Android RadioGroup Example

This Android Program creates a Radio Group in an Application using Java.

Here is source code of the Program to demonstrate a Radio Group in an Application. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.

 
package com.example.creating_radiogroup;
 
import android.app.Activity;
import android.graphics.Typeface;
import android.os.Bundle;
import android.renderscript.Type;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;
 
public class MainActivity extends Activity implements OnCheckedChangeListener {
 
    TextView textout;
    EditText textin;
    RadioGroup styleG, gravityG;
    Button gen;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textout = (TextView) findViewById(R.id.tvChange);
        textin = (EditText) findViewById(R.id.edittext1);
        styleG = (RadioGroup) findViewById(R.id.rg1);
        styleG.setOnCheckedChangeListener((OnCheckedChangeListener) this);
        gravityG = (RadioGroup) findViewById(R.id.rg2);
        gravityG.setOnCheckedChangeListener((OnCheckedChangeListener) this);// set us down @
                                                    // oncheckedChanged function
        gen = (Button) findViewById(R.id.bGenerate);
        gen.setOnClickListener(new View.OnClickListener() {
 
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                textout.setText(textin.getText().toString());
            }
        });
 
    }
 
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        // TODO Auto-generated method stub
        switch (checkedId) {
        case R.id.rbLeft:
            textout.setGravity(Gravity.LEFT);
            break;
        case R.id.rbRight:
            textout.setGravity(Gravity.RIGHT);
            break;
        case R.id.rbCenter:
            textout.setGravity(Gravity.CENTER);
            break;
        case R.id.rbNormal:
            textout.setTypeface(Typeface.defaultFromStyle(Typeface.NORMAL),
                    Typeface.NORMAL);
            break;
        case R.id.rbBold:
            textout.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD),
                    Typeface.BOLD);
            break;
        case R.id.rbitalics:
            textout.setTypeface(Typeface.defaultFromStyle(Typeface.ITALIC),
                    Typeface.ITALIC);
            break;
 
        default:
            break;
        }
    }
}

Xml

 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" 
   android:background="@drawable/background1">
 
    <EditText
        android:id="@+id/edittext1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text=" " />
 
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingBottom="40px"
        android:paddingTop="40px"
        android:weightSum="2" >
 
        <!-- need to look at weight sum and layout_weight -->
 
        <TextView
            android:id="@+id/tvStyle"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:paddingLeft="50px"
            android:text="Style"
            android:textAppearance="?android:attr/textAppearanceLarge" />
 
        <TextView
            android:id="@+id/tvGravity"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center_horizontal"
            android:paddingRight="40px"
            android:text="Gravity"
            android:textAppearance="?android:attr/textAppearanceLarge" />
    </LinearLayout>
 
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingBottom="40px"
        android:weightSum="2" >
 
        <RadioGroup
            android:id="@+id/rg1"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="vertical" >
 
            <RadioButton
                android:id="@+id/rbNormal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Normal" />
 
            <RadioButton
                android:id="@+id/rbitalics"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Italics" />
 
            <RadioButton
                android:id="@+id/rbBold"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Bold" />
        </RadioGroup>
 
        <RadioGroup
            android:id="@+id/rg2"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="vertical"
            android:paddingLeft="70px" >
 
            <RadioButton
                android:id="@+id/rbLeft"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Left" />
 
            <RadioButton
                android:id="@+id/rbCenter"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Center" />
 
            <RadioButton
                android:id="@+id/rbRight"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Right" />
        </RadioGroup>
    </LinearLayout>
 
    <TextView
        android:id="@+id/tvChange"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="40px"
        android:text="Type here text and press button"
        android:textAppearance="?android:attr/textAppearanceLarge" />
 
    <Button
        android:id="@+id/bGenerate"
        android:layout_width="308dp"
        android:layout_height="wrap_content"
        android:text="Generate" />
 
</LinearLayout>

AndroidManifest

 
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.creating_radiogroup"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
 
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.creating_radiogroup.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>

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